**Current Filters**

**Source**

**Conference**

**Theme**

**Author**

- Aadnøy, B. S. (1)
- Aarset, A. (1)
- Abdullah, R. A. (1)
- Adhikary, D. P. (1)
- Agliardi, F. (1)
- Ahangari, K. (1)
- Ahmadi, A. (1)
- Akutagawa, S. (1)
- Al-Attar, A. (1)
- Alber, M. (3)
- Alehossein, H. (1)
- Alejano, L. R. (2)
- Allen, S. (1)
- Aloodari, S. (1)
- Amann, F. (5)
- Amantini, E. (1)
- Amusin, B. (1)
- Andersson, J. C. (1)
- André, C. (1)
- Angelini, O. (1)
- Anvari, A. A. (1)
- Aoki, K. (1)
- Arbanas, Ž. (1)
- Arman, H. (2)
- Armand, G. (1)
- Asadi, M. S. (1)
- Ashtiani, M. (1)
- Astore, G. (1)
- Avanzi, G. D’Amato (1)
- Avunduk, E. (1)
- Baczynski, N. R.P. (2)
- Bagci, M. (1)
- Bagheri, M. (1)
- Bahrani, N. (1)
- Balci, C. (3)
- Ballivy, G. (1)
- Bao, J. (1)
- Barberini, V. (1)
- Barbieri, G. (1)
- Barla, G. (4)
- Barla, M. (1)
- Barnichon, J. D. (1)
- Bayram, O. (1)
- Beck, D. A. (2)
- Bernasconi, M. (1)
- Berry, P. (1)
- Beyhan, S. (2)
- Bigarré, P. (2)
- Bilgin, N. (3)
- Blaheta, R. (1)
- Blioumi, A. (1)
- Blümel, M. (1)
- Bodur, B. (1)
- Boldini, D. (1)
- Bollaert, E. F.R. (1)
- Bond, A. (1)
- Bonini, M. (1)
- Bortolussi, A. (1)
- Bost, M. (1)
- Branscombe, L. (1)
- Brown, S. (1)
- Bruggemann, D. (1)
- Buckingham, T. (1)
- Button, E. A. (3)
- Buzzi, O. (1)
- Byrne, T. (1)
- Bäckblom, G. (1)
- Böller, K. (1)
- Calista, M. (1)
- Cao, N. T. (1)
- Cekerevac, C. (1)
- Chai, H. J. (1)
- Chakeri, H. (1)
- Chang, C. (1)
- Chang, C. S. (1)
- Chantry, R. (1)
- Charlier, R. (1)
- Chen, L. (1)
- Chen, S. H. (2)
- Chen, Y. (1)
- Chi, S. Y. (1)
- Chikahisa, H. (1)
- Chopard, P. (1)
- Choupani, N. (1)
- Christiansson, R. (1)
- Ciccu, R. (1)
- Coli, M. (1)
- Coli, N. (1)
- Collin, F. (1)
- Collotta, T. (1)
- Comellas, J. (1)
- Conde, M. (2)
- Contrucci, I. (1)
- Costa, G. (1)
- Cottrell, B. (2)
- Crosta, G. B. (1)
- Date, K. (1)
- Daupley, X. (1)
- Dessauges, A. (1)
- Diederichs, M. S. (6)
- Dugonjic, S. (1)
- Duveau, G. (1)
- Düzyol, S. (1)
- Eichenberger, J. (1)
- Eichhorn, A. (1)
- Einstein, H. H. (1)
- Eisenberg, J. (1)
- Emir, E. (2)
- Ercoli, L. (1)
- Eremeeva, E. I. (1)
- Erni, C. (1)
- Evangelista, A. (1)
- Fahimifar, A. (1)
- Fang, J. N. (1)
- Farhadian, H. (1)
- Fattahpour, V. (1)
- Feinendegen, M. (1)
- Fellmann, W. (1)
- Fellner, D. (1)
- Feng, X. (1)
- Feridunoglu, C. (1)
- Fernández-Steeger, T. (1)
- Ferrer, M. (1)
- Ferrero, A. M. (1)
- Festl, J. (1)
- Figueras, S. (1)
- Filipov, K. (1)
- Fityus, S. G. (1)
- Flum, D. (1)
- Fomin, V. M. (1)
- Forsyth, G. F. (1)
- Fowell, R. J. (1)
- Frei, W. (1)
- Fritschen, R. (1)
- Fuenkajorn, K. (1)
- Fujii, N. (1)
- Fujii, Y. (2)
- Fujisawa, K. (1)
- Fujita, T. (1)
- Fukuda, D. (1)
- Fukuda, T. (1)
- Fusi, N. (1)
- Gaffet, S. (1)
- Gaich, A. (1)
- Galic, A. (1)
- Garitte, B. (1)
- Gasc-Barbier, M. (2)
- Gaspari, G. M. (2)
- Gastaldo, L. (1)
- Ge, X. R. (1)
- Gekas, S. (1)
- Gens, A. (1)
- Ghabezloo, S. (1)
- Ghamgosar, M. (1)
- Ghazvinian, A. (1)
- Ghazvinian, E. (1)
- Giacomini, A. (1)
- Giani, G. P. (2)
- Giwelli, A. A. (1)
- Goktepe, F. (2)
- Gomes, J. P. (1)
- González de Vallejo, L. I. (1)
- Grasselli, G. (3)
- Grasso, P. (1)
- Greco, O. Del (1)
- Grošic, M. (1)
- Grygar, R. (1)
- Grünenfelder, F. (1)
- Guglielmi, Y. (1)
- Gunzburger, Y. (1)
- Gursel, M. (1)
- Hamich, M. Ben (1)
- Hamidi, J. Khademi (1)
- Hareland, G. (1)
- Harrap, R. (1)
- Harustiak, J. (1)
- Hasanpour, R. (2)
- Hassani, B. (1)
- Hedayatzadeh, M. (1)
- Hindistan, M. A. (2)
- Hoang, T. T.N. (2)
- Hohberg, J. M. (1)
- Hosseinian, A. (1)
- Hou, M. Z. (3)
- Houriet, B. (1)
- Howald, E. Prina (1)
- Hoxha, P. (1)
- Hsiao, F. Y. (1)
- Hutchinson, D. J. (2)
- Idziak, A. F. (1)
- Ilov, G. (1)
- Iqbal, M. J. (1)
- Ismail, A. (1)
- Iwata, N. (1)
- Jaboyedoff, M. (2)
- Jacobsson, L. (1)
- Jafari, M. (1)
- Jalali, S. M.E. (1)
- Janek, J. (1)
- Janeras, M. (1)
- Jeromel, G. (1)
- Jiang, Y. D. (1)
- Jing, L. (2)
- Johansson, F. (1)
- John, M. (1)
- Kaiser, P. K. (3)
- Kakaie, R. (1)
- Kalenchuk, K. S. (1)
- Kaneko, K. (2)
- Karam, K. (1)
- Katibeh, H. (1)
- Katsikogianni, P. (1)
- Kawamura, S. (1)
- Kawasaki, S. (1)
- Kazerani, T. (1)
- Keshavarz, M. (1)
- Kim, T. (1)
- Kishkina, S. B. (1)
- Kister, B. (2)
- Kitajima, H. (1)
- Klanphumeesri, S. (1)
- Klaper, M. (1)
- Klein, E. (1)
- Kocharyan, G. G. (1)
- Kodama, J. (1)
- Koe, A. (1)
- Kohut, R. (1)
- Koizumi, Y. (1)
- Kolymbas, D. (1)
- Kondo, D. (2)
- Konícek, P. (1)
- Kossev, N. (1)
- Kouwenberg, P. (1)
- Kovrov, O. S. (1)
- Koyama, T. (1)
- Kubota, S. (1)
- Kustamsi, A. (1)
- Kusui, A. (1)
- Kveldsvik, V. (1)
- Kwasniewski, M. (1)
- Kwon, S. (1)
- Käsling, H. (1)
- Labiouse, V. (3)
- Lacy, H. S. (1)
- Lahaie, F. (2)
- Laini, M. (1)
- Laloui, L. (2)
- Lan, H. (1)
- Lato, M. J. (1)
- Laviguerie, R. (1)
- Lee, C. S. (1)
- Lee, J. (1)
- Leung, C. T.O. (1)
- Levasseur, S. (1)
- Levkovitch, V. (2)
- Li, C. G. (1)
- Li, H. P. (1)
- Li, J. C. (2)
- Li, X. X. (1)
- Li, Z. K. (1)
- Liang, W. M. (1)
- Likar, J. (1)
- Lin, J. (1)
- Lin, W. (1)
- Lin, Y. L. (1)
- Lisjak, A. (1)
- Marache, A. (2)
- Marcher, T. (2)
- Marijanovic, P. (2)
- Martin, C. D. (3)
- Maurenbrecher, P. M. (2)
- Ngan-Tillard, D. J.M. (2)
- Ozsoy, E. A. (2)
- Pedrazzini, A. (2)
- Perucho, A. (2)
- Rabe, C. (2)
- Rasouli, V. (4)
- Reusch, F. (2)
- Riss, J. (2)
- Roduner, A. (2)
- Salager, S. (2)
- Sasaki, K. (2)
- Serrano, A. (2)
- Shao, J. F. (2)
- Sofianos, A. I. (2)
- Steiner, W. (2)
- Sulem, J. (4)
- Takahashi, M. (2)
- Tatone, B. S.A. (2)
- Thuro, K. (2)
- Thöny, R. (2)
- Tumaç, D. (3)
- Williams, D. J. (2)
- Yilmaz, G. (2)
- Zanoli, O. (2)
- Zhao, G. F. (2)
- Zhu, J. B. (2)
- Zimmerman, R. W. (2)
- Çopur, H. (3)
- Ünver, B. (3)

to

Go **Concept Tag**

- amplitude (8)
- analysis (38)
- angle (9)
- application (9)
- Artificial Intelligence (28)
- Behavior (9)
- behaviour (11)
- block (13)
- case (8)
- cavern (7)
- change (9)
- coefficient (10)
- complex reservoir (7)
- compression (7)
- condition (12)
- construction (19)
- construction materials (9)
- contact (8)
- crack (16)
- criterion (9)
- damage (9)
- deformation (24)
- design (13)
- direction (8)
- discontinuity (17)
- displacement (28)
- distribution (9)
- effect (19)
- Engineering (12)
- equation (12)
- excavation (28)
- experiment (12)
- factor (8)
- failure (32)
- fault (8)
- flow in porous media (7)
- Fluid Dynamics (9)
- formation (7)
- fracture (24)
- function (10)
- ground (10)
- ground transportation (11)
- health safety security environment and social responsibility (12)
- Horizontal (8)
- hydraulic fracturing (24)
- increase (12)
- intact rock (7)
- investigation (8)
- laboratory (18)
- landslide (9)
- limestone (7)
- loading (10)
- machine learning (8)
- management and information (49)
- mass (11)
- material (27)
- mechanics (9)
- metals & mining (16)
- method (25)
- model (26)
- MPa (10)
- permeability (8)
- process (10)
- project (8)
- propagation (10)
- property (14)
- rail transportation (10)
- Reservoir Characterization (152)
- reservoir description and dynamics (169)
- reservoir geomechanics (54)
- rock (112)
- rock mass (29)
- Rock mechanics (10)
- rock slope (8)
- sample (32)
- sandstone (8)
- seismic processing and interpretation (23)
- shear (28)
- shear strength (9)
- Simulation (9)
- slope (31)
- specimen (15)
- stability (18)
- strain (18)
- strength (51)
- stress (55)
- structural geology (30)
- structure (12)
- support (15)
- surface (26)
- system (16)
- tensile (8)
- test (42)
- tunnel (40)
- Upstream Oil & Gas (162)
- variation (10)
- water (10)
- well completion (25)
- Wellbore Design (11)
- wellbore integrity (10)

to

GoLin, W. (Japan Agency for Marine-Earth Science and Technology) | Byrne, T. (University of Connecticut) | Tsutsumi, A. (Kyoto University) | Chang, C. (Chungnam National University) | Yamamoto, Y. (Kochi University) | Sakaguchi, A. (Japan Agency for Marine-Earth Science and Technology)

In-situ stress orientations were determined by two independent methods in a scientific ocean drilling project in southwest Japan subduction zone. The first method is a core-based three-dimensional method called anelastic strain recovery (ASR) method; the second one is a traditional method using borehole wall image to analyze borehole wall compressive failures (breakouts) developed in oil industry which yields orientations of the principal horizontal stresses. The horizontal stress orientations at two drilling sites C0002 and C0006 showed having almost right angle; one is parallel with the direction of plate motion, however, the other one is perpendicular with it. The stress orientations independently determined by ASR measurements and borehole breakout analyses were consistent well at both the drilling sites.

An IODP (Integrated Ocean Drilling Program) scientific deep drilling project, NanTroSEIZE (Nankai Trough Seismogenic Zone Experiments) is undergoing in the southwest Japan subduction zone to understand the physics of an active fault (Kinoshita et al., 2006). Determination of current in-situ stress is one of the main scientific objectives. In the first stage of NanTro- SEIZE, several vertical boreholes were drilled by the deep drilling vessel

ISRM-EUROCK-2010-174

ISRM International Symposium - EUROCK 2010

anelastic strain, anelastic strain recovery, ASR, borehole, core, deep drilling project, Drilling, expedition, independent method, Japan, orientation, plate, principal horizontal stress, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, sample, scientist, site, stress, stress orientation, Upstream Oil & Gas

SPE Disciplines:

The mechanical behaviours of geomaterials are significantly affected by the presence of voids or cracks-like defects. The modelling of such behaviour is classically performed by considering purely macroscopic or micromechanically-based damage models. In the perspective of applications in civil engineering or in geomechanics, we propose in this paper to evaluate a homogenization approach, based on Mori-Tanaka scheme, applied to microcracked materials. In order to provide an appropriate interpretation of the nonlinear behaviour at macro-scale, the crack-induced damage is coupled to friction phenomena on closed cracks lips. The predictions of the coupled model are first analysed on laboratory tests performed on Callovo-Oxfordian Clay. Then, they are extended to a numerical analysis of excavation damaged zones around tunnels.

A zone with significant irreversible deformations and significant changes in flow and transport properties (named Excavation Damaged Zone or EDZ) is expected to be formed around underground excavations in the deep geological layers considered for the high level radioactive waste disposal. The modelling of such behaviour is classically performed by considering macroscopic or micromechanically-based damage models. Recent developments in the field of homogenization methods provide now physically and mathematically appropriate framework for the investigation of the behaviour of micro-cracked media including the description of damage anisotropy-induced anisotropy, as well as cracks closure effects (Zhu et al. 2008; Dormieux et al. 2006). However, in the perspective of applications to civil engineering or geotechnical problems, like underground excavations, it is desirable to evaluate the different homogenization schemes by an analysis of their assumptions and of the macroscopic response that they predict. The purpose of the present study is to provide an analysis of a micromechanical damage model in order to give an appropriate interpretation of the nonlinear behaviour at macro-scale under particular stress paths.

ISRM-EUROCK-2010-029

ISRM International Symposium - EUROCK 2010

analysis, application, behaviour, compression, compression test, crack, damage, direction, elastoplastic model, equivalent, excavation, friction, health safety security environment and social responsibility, loading, micromechanical approach, micromechanical model, reservoir description and dynamics, reservoir simulation, stress, tunnel, Upstream Oil & Gas, well

SPE Disciplines:

This paper examines the relationship between roughness estimates and the resolution of the surface measurements on which they are based. To do so, several fracture replicas are digitized with a stereotopometric camera at three different resolutions. Subsequently, the variations in the calculated 3D roughness parameters are analyzed. By direct shear testing the replicas with a range of normal stresses, the failure envelope defined by the laboratory results can be compared to the strength envelopes predicted according to empirical shear criteria. In doing so, an empirical relationship between resolution and roughness can be established to correct the predicted shear strength. The development of such an expression permits consistent and accurate shear strength estimates to be obtained. With further verification, the proposed correction will allow different practitioners to obtain consistent shear strength estimates using 3D surface measurements from different equipment with varying resolution.

Recent research has yielded promising new3Dparameters to better characterize surface roughness of rock discontinuities using high resolution 3D surface measurements (Tatone & Grasselli 2009a). Nevertheless, the influence of varying measurement resolution on roughness estimates has yet to be considered in detail. As outlined by several researchers, measurement resolution (or point spacing) can have a significant impact on the parameterization of discontinuity roughness (e.g. Hong et al. 2008, Tatone & Grasselli 2009b). Thus, to facilitate comparison of 3D roughness parameters derived from 3D data with different resolutions, it is essential that the resolution of the system being used be known and disclosed. Moreover, to avoid misleading estimates of discontinuity shear strength via empirical strength criteria, the relationship between roughness estimates and the resolution of measurement on which they are based must be understood. At present there are no suggested methods or guidelines to determine what resolution (nominal point spacing) should be used to measure discontinuity roughness.

ISRM-EUROCK-2010-042

ISRM International Symposium - EUROCK 2010

criterion, discontinuity, Discontinuity Roughness, equation, fracture, fracture replica, function, Grasselli, laboratory, nominal point, replica, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, resolution, rock, roughness, shear, shear strength, strength, surface, surface roughness, tatone, Upstream Oil & Gas

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.31)

The determination of the geometrical features of failure modes is the first step in slope design and planning applications. In addition, it is well known that wedge rock blocks are the most common failure mode type. This paper presents the basic components of an approach for establishing the geometry of wedge rock blocks of fractured rocks. A simple new classification system was developed for the construction of the model. The main advantage of this new geometric model is that it presents more practical and rapid solutions for potential failure mechanisms than other classical solutions. The results obtained from an experimental field show the effectiveness of the proposed modeling method.

Discontinuity orientation is an important parameter affecting rock slope stability, as this feature mainly influences the failure types and kinematic instability. In rock slopes it is often assumed that failure is confined to preexisting fracture planes or combinations of planes. This assumption implies that there are various failure modes (Hadjigeorgiou & Grenon, 2005). Thewedge failure mode is a common type in jointed rock slopes. The stability of these exposed wedges is mainly influenced by the geometry of the wedges. Therefore, the detailed geometry of the possible sliding mass should be analyzed first. Several previous researchers focused on subjects regarding the stability problems of discontinuous rock slopes, such as the generation of blocky rock mass by Warburton (1983) and Heliot(1988); the determination of sliding modes and safety factors of sliding blocks by Hoek & Bray (1981); the assessment of kinematic feasibility, using stereographic projection by Priest (1980), and the block theory developed by Goodman&Shi, 1985. Hocking (1976) dividedwedge failures into two modes, in terms of sliding planes of wedges. One is single plane sliding (plane failure), and the other is double plane sliding.

ISRM-EUROCK-2010-120

ISRM International Symposium - EUROCK 2010

Technology:

Modeling the behavior of rock masses consisting of a large number of layers is often necessary in mining applications (e.g. coal mining). Such a modeling can be carried out in a discontinuum manner by explicit introduction of joints using either the finite element or distinct element approach. When the number of layers to be modeled is excessively large it is advantageous to devise a continuum-based method. A continuum description of a layered medium can be formulated as long as consistency and statistical homogeneity in joint properties and spacing can be established. However, when joint slips are large and rock layers do bend as they slip against each other continuum-based models based on standard conventional continuum theories (e.g. ubiquitous joint model) may considerably overestimate the deformation since the bending rigidity of the rock layers are not incorporated in such model formulations.

ISRM-EUROCK-2010-033

ISRM International Symposium - EUROCK 2010

component, Cosserat, Cosserat model, deformation, direction, failure, layer, layered rock, perpendicular, Reservoir Characterization, reservoir description and dynamics, rock layer, shear, shear strength, shear stress component, stiffness, strength, stress, ubiquitous joint model, Upstream Oil & Gas

Marbles are industrial natural stones used for monuments, plating equipment, a final cover of buildings in and outside etc… Usage period of marbles exposed to natural weather conditions may get shortened because of a decrement of mechanical properties since water absorbed by marbles are frozen in the cold parts of seasons and this event stresses pores to initiate micro fissures and cracks in marbles. Then ice in it melts in hot seasons. This phenomenon is repeated every year. Due to this fact, a drop on mass and mechanical properties of marbles may be experienced and it follows with a fracture and fragmentation resulting by out of usage and renovation. In this study, mechanical properties of marbles such as uniaxial compressive strength, indirect tensile strength, Böhme abrasion resistance, fracture toughness, and point load, are examined for five different marbles after and before freeze and thaw cycles. Schmidt hammer rebound values are also determined. From literature, the number of samples is increased to 18 for uniaxial compressive strength test. According to the results, between values after and before freeze and thaw process, high correlation with uniaxial compressive strength, indirect tensile strength and Böhme abrasion resistance, a correlation in moderate with point load strength, fracture toughness strength are found out. This helps practitioners first to predict the aforementioned properties after freeze & thaw which is hard to perform and a time consumer process and second to design more realistic project plan when a marble subjected to bad weather conditions is used.

Marble,which is derived from the Ancient Greekword “mármaros”,which means “crystalline rock”, “shining stone”, is a metamorphic rock resulting from the metamorphism of limestone, composed mostly of calcite and it is extensively used for sculpture, as a building material, and in many other applications (Internet 1).

ISRM-EUROCK-2010-025

ISRM International Symposium - EUROCK 2010

SPE Disciplines:

- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Completion > Hydraulic Fracturing (1.00)

You, S. (Ecole Polytechnique Fédérale de Lausanne (EPFL)) | Labiouse, V. (Ecole Polytechnique Fédérale de Lausanne (EPFL)) | Vigne, L. (Ecole Polytechnique Fédérale de Lausanne (EPFL)) | Gastaldo, L. (Ecole Polytechnique Fédérale de Lausanne (EPFL)) | Bernasconi, M. (Centre Hospitalier Universitaire Vaudois and University of Lausanne)

Laboratory experiments carried out at the LMR-EPFL on thick-walled hollow cylindrical samples aim at modelling at small-scale conditions similar to those that will be experienced by host rocks around disposal galleries for heat emitting radioactive waste. The paper presents results on a Boom Clay sample cored parallel to the bedding planes and subjected to a decrease of the confining pressure in the central hole of the hollow cylinder. It focuses on medium resolution X-Ray Computed Tomography (XRCT) scans of the sample inside the testing cell that were carried out with a medical scanner. By comparing the scans before and after the mechanical unloading (tracking of the movement of pyrite inclusions), quantitative analyses of the displacements undergone by the clay can be performed.The observations point out a significant mechanical anisotropy of Boom Clay related to its bedding planes.

Within the 6th EURATOM Framework Program of the European Community, the TIMODAZ project (Thermal Impact on the Damaged Zone Around a RadioactiveWaste Disposal in Clay Host Rocks) aims at studying the fracturing and self-sealing processes that develop in the Excavation Damaged Zone (EDZ) around disposal galleries for heat emitting radioactive waste and at assessing the impact of the thermal phase on their evolution. Three different potential geological formations for deep radioactive waste repositories are investigated in the project, i.e. the Boom, Opalinus and Callovo-Oxfordian clayey formations. This paper presents results on a sample of Boom Clay (N◦ 13A) cored parallel to the bedding planes. After a short presentation of the testing device and procedure, the paper focuses on medium resolution X-Ray Computed Tomography (XRCT) scans of the sample carried out at the CHUV (Cantonal Hospital in Lausanne) before and after the mechanical unloading and provides some explanations about the image processing performed to analyse the displacements undergone by the clay.

ISRM-EUROCK-2010-175

ISRM International Symposium - EUROCK 2010

bedding plane, Boom clay, central hole, coefficient, formation evaluation, gallery, hollow cylinder, hollow cylindrical sample, laboratory, Lausanne, material, radioactive waste, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, resolution x-ray computed, sample, scan, structural geology, testing, tomography, Upstream Oil & Gas

SPE Disciplines:

- Reservoir Description and Dynamics > Formation Evaluation & Management > Cross-well tomography (0.85)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.68)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (0.68)

Recent innovations in yield-control support systems allow to increase the rate of advance when tunneling in difficult conditions is associated with severely squeezing rock. Such systems which imply the insertion in the lining of highly deformable concrete elements are being adopted successfully in tunneling projects using conventional excavation methods. The Saint Martin access edit excavated in a Carboniferous Formation along the Base Tunnel of the Lyon-Turin rail line is presented as a case study. Numerical analyses are discussed to compare the results of computed and measured performance of a typical monitored section and to find out possible optimizations of the support system adopted.

Tunnel construction in squeezing rock is very demanding due to the difficulty in making reliable predictions at the design stage. Squeezing conditions may vary over short distances due to rock heterogeneity and fluctuations in rock mass properties. Indeed, the selection of the most appropriate excavation-construction method to be adopted is highly problematic and uncertain. In deep tunnels, whenever squeezing conditions are anticipated, conventional tunneling appears to be yet the method most often used. Conventional tunneling in squeezing rock generally takes place with a slow rate of advance. However, if the work at the face is well planned and appropriate stabilization measures are implemented, excavation can proceed at an acceptable rate of advance. A clear need to develop appropriate technological systems that help increase such a rate of advance is to be recognized (Cantieni & Anagnostou, 2009).

The Saint Martin La Porte access edit is a vital part of the early works for the Lyon-Turin Base Tunnel, which is at the centre of the axes linking the North and South, and East and West Europe and is to be excavated between the portals in Italy and France.

ISRM-EUROCK-2010-104

ISRM International Symposium - EUROCK 2010

Barla, Chainage, condition, displacement, distribution, excavation, hidcon, knowledge management, lining, management and information, Reservoir Characterization, reservoir description and dynamics, rock, rock mass, shotcrete, shotcrete lining, strain, stress, support, system, tunnel, yield-control support system

Country:

- North America (0.76)
- Europe > France (0.35)

SPE Disciplines:

Zhao, G. F. (Ecole Polytechnique Federale de Lausanne (EPFL), Rock Mechanics Laboratory) | Sun, L. (Ecole Polytechnique Federale de Lausanne (EPFL), Rock Mechanics Laboratory) | Zhu, J. B. (Ecole Polytechnique Federale de Lausanne (EPFL), Rock Mechanics Laboratory) | Fang, J. N. (Ecole Polytechnique Federale de Lausanne (EPFL), Rock Mechanics Laboratory)

This paper presents the OpenMP parallel implementation of the Distinct Lattice Spring Model (DLSM). The motivation of this study is to reduce the computing time and increase the computational capacity of the DLSM code. Firstly, the basic theory of DLSM is introduced. As an explicit method, the DLSM is very suitable for parallelization implementation. Only a fewcode changes are needed for the OpenMP implementation. Then, the detail parallel design of the OpenMP implementation is presented. Finally, numerical examples are evaluated on quad-core PCs to test the speedup of the parallel DLSM. It is found that a maximum speedup of more than four times is achieved. This means the implementation is successful.

Recently, researchers have realized the importance of the microstructure of rock when studying the macroscopic mechanical behaviors. The experimental methods, e.g., the ultra-bright synchrotron radiation (SR)-CT system (Ichikawa et al, 2001), the scanning electron microscope (SEM) (Wang et al, 2005) and laboratory-based micro X-ray CT (50–500 um) (Flemming, 2007), are used to study the micro-cracking and propagation and time-dependent fracturing behavior of rock and concrete materials. However, the experimental methods are limited by the detection conditions, e.g. CT and SEM are only applicable at low loading rates, it became a barrier of performing further study on the dynamic response on rock materials. Fortunately, numerical methods provide extremely powerful tools for this kind of study. However, in most cases microscopic modeling has very high requirement on the computational capacity of the numerical code and a parallel version is necessary. In this paper, we will discuss the parallel implementation of the Distinct Lattice Spring Model (DLSM) which is a microstructure based method proposed by Zhao et al (2009) and have been used to study the dynamic response of rock materials at microscopic scale (Zhao and Zhao, 2009).

ISRM-EUROCK-2010-036

ISRM International Symposium - EUROCK 2010

code, computing, displacement, DLSM, hydraulic fracturing, Implementation, material, model, OpenMP, parallel dlsm, parallel dlsm code, parallel implementation, parallelization, particle, Reservoir Characterization, reservoir description and dynamics, reservoir simulation, rock, Serial, speedup, spring, three-dimensional distinct lattice spring model, Upstream Oil & Gas, well completion

SPE Disciplines:

Feinendegen, M. (RWTH Aachen University) | Ziegler, M. (RWTH Aachen University) | Spagnoli, G. (RWTH Aachen University) | Fernández-Steeger, T. (RWTH Aachen University) | Stanjek, H. (RWTH Aachen University)

During mechanical tunnel driving in fine grained soil or rock the excavated material often sticks to the cutting tools or conveying system, which may cause great difficulties in its excavation and transport. In the joint research project INPROTUNNEL of RWTH Aachen University together with industrial partners this problem is faced on different scales particularly for the method of Earth Pressure Balanced (EPB) shield tunnelling. Main topic of this paper is the development of a new laboratory test to detect the adhesion/clogging propensity of a rock or soil already in the preliminary phase of a project and to quantify these as far as possible. Furthermore, a first draft of a new classification scheme for the clogging potential is presented.

Mechanical tunnel driving with Tunnel Boring Machines (TBM) is a world-wide popular method within tunnelling, whereby the limits of its application (diameter, length, overburden, water pressure, subsoil, etc.) are being constantly pushed ahead. In many cases and particularly in combination with water inflow, the excavated material sticks to the cutting tools or conveying system. This may cause great difficulties in its excavation, transport and re-use or dumping: High energy demand, blocking or breakdown of excavation tools (Fig. 1), clogging of screw or band conveyors, problems in stability during the reuse caused by lower shear resistance of the (possibly conditioned) excavation material, etc. An important factor for the performance of a tunnel construction project is the detailed knowledge of the expected geological and geotechnical conditions since the choice of suitable construction methods (face support, cutting tools, material transport, supporting and lining, etc.) depends on the resulting effects on the construction processes. Here, the problem of adhesion/ clogging of excavated material to the surfaces of cutting and transportation equipment in particular is of key importance.

ISRM-EUROCK-2010-097

ISRM International Symposium - EUROCK 2010

Thank you!