**Source**

**Theme**

**Author**

- Abdelghany, Osman (1)
- Abdullah, Hasan (1)
- Ablyamitov, N. (1)
- Ahangari, K. (1)
- Ahmadi, M. (1)
- Ajalloeian, R. (1)
- Ajamzadeh, Hamed (1)
- Akutagawa, S. (1)
- Al-Khateeb, Azhar A.G. (1)
- Alejano, L.R. (1)
- Aloodari, S. (1)
- Amirhesari, Naser (1)
- An, Xinmei (1)
- Arabnejad, H. (1)
- Aresh, B. (1)
- Arman, Hasan (1)
- Asadi, M.S. (1)
- Asadizadeh, M. (1)
- Ayati, F. (1)
- Azin, A. (1)
- Badge, Yogita (1)
- Bae, S.H. (1)
- Bagde, M.N. (1)
- Baghbanan, A. (1)
- Baisheng, Nie (1)
- Bajpai, R.K. (1)
- Balg, Christophe (3)
- Barla, H. (1)
- Basu, Arindam (2)
- Bayati, M. (1)
- Bejari, Hadi (1)
- Bellendir, E. (1)
- Bhasin, Rajinder (1)
- Bich, G. (1)
- Blaheta, Radim (1)
- Bratli, Rolf K. (1)
- Brenniman, H.W. (1)
- Brown, E.T. (1)
- Budi, Takashi Sasaoka (1)
- Burnell-Gray, J.S. (1)
- Capigian, Arsen O. (1)
- Chae, K.S. (1)
- Chakeri, H. (1)
- Chakravarthy, C.P. (1)
- Chamine, H. (1)
- Chang, Xi-Kun (2)
- Chauhan, R.S. (2)
- Chen, Jun-Tao (2)
- Chen, Youqing (1)
- Chena, Wenxue (1)
- Cheniany, Alireza (1)
- Cherkez, E. (1)
- Cho, Hyun (1)
- Choi, Sung O. (1)
- Chugh, Yoginder P. (3)
- Chung, S.K. (1)
- Chunhe, Yang (1)
- Coli, Massimo (1)
- Coli, Niccolo (1)
- Coskun, A. (1)
- Curran, J.H. (1)
- Curtaz, M. (1)
- Da Fontoura, Sergio A.B. (1)
- Daadbin, A. (1)
- Dadkhah, _ (1)
- Danguang, Pan (1)
- Darbor, Mohammad (1)
- Das, Kamal C. (1)
- De Rivaz, B. (1)
- Deb, D. (1)
- Deb, Debasis (1)
- Dehkordi, M.S. (1)
- Dey, S. Dutta (1)
- Dhakate, Milind V. (1)
- Dhawan, Gopal (1)
- Didier, Christophe (1)
- Doi, Yusuke (1)
- Dong, Cheng (1)
- Dubey, R.K. (1)
- Dusseault, Maurice B. (1)
- Dwivedi, R.D. (1)
- Ebrahimabadi, Arash (1)
- Eftekhari, M. (1)
- El Saiy, Ayman (1)
- El Tokhi, Mohamed (1)
- Fan, L.F. (1)
- Farazmand, A. (1)
- Felice, C.W. (1)
- Feng, Xia-Ting (2)
- Ferrero, A.M. (1)
- Figueiredo, Bruno (1)
- Finkbeiner, Thomas (1)
- Fratta, D. (1)
- Freiberg, E. (1)
- Fu, Guoyang (1)
- Fuenkajorn, Kittitep (2)
- Fujii, Y. (1)
- Fukahori, D. (1)
- Fukuda, Daisuke (1)
- Gage, J.R. (1)
- Galler, Robert (1)
- Garaga, Arunakumari (1)
- Gharouni-Nik, Morteza (1)
- Gharpure, A.D. (1)
- Ghasemzadeh, Hasan (1)
- Ghazvinian, Abdolhadi (1)
- Gholamnejad, Javad (1)
- Gilby, John L. (1)
- Goel, R.K. (2)
- Golitsyn, V. (1)
- Goshtasbi, Kamran (1)
- Guo, M.D. (1)
- Guo, Wei-Jia (2)
- Guowei, M.A. (1)
- Gupta, Manish (1)
- Gurley, Harrold (2)
- Hadei, Mir Raouf (1)
- Haeri, Hadi (1)
- Haijun, Mao (1)
- Haiming, Liu (1)
- Halakatevakis, N. (1)
- Hamidi, Jafar Khademi (3)
- Han, Kong-Chang (1)
- Hasegawa, D. (1)
- Hashem, Waheed (1)
- Hashemi, M. (3)
- Hashemi, Siamak (1)
- Hashim, M.H.M. (1)
- Hatzor, Yossef H. (1)
- He, Lei (1)
- Hea, Xueqiu (1)
- Hedayatzadeh, M. (2)
- Hirata, A. (1)
- Hossain, Md Monir (1)
- Hossainim, Smf. (1)
- Hou, T. (1)
- Huang, Dong-Mei (1)
- Hudson, John A. (2)
- Ilamkar, P.T. (1)
- Iqbal, M.J. (1)
- Ishida, M. (1)
- Ishida, T. (1)
- Ishizaki, Takahiro G. (1)
- Jahanbakhshi, Reza (1)
- Jain, S.K. (2)
- Jalalifar, Hossein (1)
- Jang, Hyong-Doo (1)
- Jang, Myoung-Hwan (1)
- Je, D.K. (1)
- Jennifer, Praveena D. (2)
- Jeon, S.W. (1)
- Jha, A.K. (1)
- Jhanwar, J.C. (2)
- Jian-Hai, Zhang (1)
- Jiang, Quan (1)
- Joseph, D. (1)
- Joshi, A. (1)
- Jung, Y.B. (1)
- Kamemura, Katsumi (1)
- Kaneko, Katsuhiko (1)
- Kang, S.S. (1)
- Kapoor, V.K. (1)
- Kataoka, M. (1)
- Ke, Kasapoglu (1)
- Keshavarzi, Reza (1)
- Khan, M.S. (1)
- Khoshrou, Seyed Hasan (1)
- Kiani, M. (2)
- Kim, C.B. (1)
- Kim, J.S. (1)
- Kim, Jaedong (1)
- Kim, Won-Beom (1)
- Kishida, K. (1)
- Kocbay, Ayhan (1)
- Kodama, Junichi (1)
- Kohno, Masanori (1)
- Kohut, Roman (1)
- Kolcun, Alexej (1)
- Kondo, K. (1)
- Konicek, Petr (1)
- Korulla, M. (1)
- Kramadibrata, Suseno (1)
- Krenn, Florian (1)
- Kumar, Naresh (1)
- Kumar, Nripendra (1)
- Kumar, R. (1)
- Kumar, Rakesh (3)
- Kuruppu, M. (1)
- Kusaka, Eishi (1)
- Kushwaha, A. (1)
- Kusuda, Hiromu (1)
- Kusumi, H. (1)
- Lamas, Luis (1)
- Land, B.J. (1)
- Latha, Gali Madhavi (1)
- Lazemi, H.A. (1)
- Lee, C.I. (1)
- Lee, Ki Hwan (1)
- Lee, S.P. (1)
- Li, J.C. (1)
- Li, Sheng (1)
- Li, Yang-Yang (1)
- Li, Zhiyong (1)
- Liu, Mingju (3)
- Liu, Yanwei (3)
- Loui, J.P. (1)
- Loui, John P. (1)
- Ma, G.W. (1)
- Ma, Guowei (2)
- Mabuchi, Mamoru (1)
- Maclaughlin, M. (1)
- Madan, M.M. (1)
- Maeda, Hiroyuki (1)
- Mahdevari, S. (1)
- Majdi, Abbas (1)
- Mamtani, Manish A. (1)
- Mandal, A. (1)
- Mandal, P.K. (1)
- Mandal, Prabhat Kumar (1)
- Manwendra, K. (1)
- Marchesi, Vivian R. (1)
- Marji, Mohammad Fatehi (1)
- Mathur, Sudhir (1)
- Matsui, Kikuo (1)
- Mehinrad, A. (1)
- Meng, Yan (1)
- Meng, Yanwei (1)
- Mingwu, He (1)
- Mishra, K.K. (2)
- Mitri, Hani (5)
- Moarefv, Parviz (1)
- Moarefvan, P. (1)
- Moarefvand, P. (1)
- Moghadam, Payam Pazhouhesh (1)
- Mohanty, B. (1)
- Moosevi, M. (1)
- Morruzzi, J. (1)
- Muralha, Jose (1)
- Murata, S. (1)
- Murdoch, L.C. (1)
- Musunuri, Anand (1)
- Nabipour, A. (1)
- Naderi, H. (1)
- Nadimi, S. (1)
- Nagar, Vipul (2)
- Nagraja Rao, G.M. (1)
- Nakamura, M. (1)
- Nakashima, S. (1)
- Nanda, A. (2)
- Narayan, P.K. (1)
- Nawrocki, Pawel (1)
- Nawrocki, Pawel A. (1)
- Nejati, Hamid Reza (1)
- Nezhadshahmohama, F. (1)
- Niea, Baisheng (1)
- Ning, Youjun (1)
- Niwa, T. (1)
- Nomikos, P.P. (1)
- Noorani, R. (1)
- Obara, Y. (1)
- Olsson, Roger (1)
- Onozuka, S. (1)
- Ootani, Tatsuhiko (1)
- Os, Dinc (1)
- Oseto, K. (1)
- Panigrahi, R.K. (1)
- Papavasiliou, S. (1)
- Parihar, S.K. (1)
- Park, Alan Seong (1)
- Park, C. (1)
- Park, Dong In (1)
- Patil, P.U. (1)
- Pellet, Frederic L. (1)
- Pires, A. (1)
- Prasad, C.D. (1)
- Prasad, V.V.R. (1)
- Purushothaman, C. (1)
- Qari, Mohammed H.T. (1)
- Rahmannejad, R. (2)
- Rajmeny, P.K. (1)
- Raju, D. (2)
- Ramulu, M. (1)
- Ranadive, M.S. (1)
- Roduner, Armin (2)
- S.D., Anitha Kumari (2)
- Sarwade, D.V. (2)
- Sen, Ananda (2)
- Shahriar, K. (3)
- Shahriar, Kourosh (3)
- Sharma, H.K. (2)
- Sharma, K.G. (2)
- Singh, Rajendra (3)
- Singh, V.K. (2)
- Singha, Gourango (3)
- Sinha, Amalendu (2)
- Sitharam, T.G. (3)
- Sofianos, A.I. (2)
- Soucek, Kamil (2)
- Tani, Kazuo (3)
- Wei, Jianping (3)

to

Go **Concept Tag**

- analysis (39)
- angle (6)
- application (11)
- Artificial Intelligence (39)
- behaviour (8)
- block (8)
- borehole (10)
- cavern (8)
- classification (6)
- coal (14)
- condition (15)
- construction (21)
- construction materials (6)
- crack (12)
- creep (6)
- damage (6)
- deformation (18)
- design (23)
- development (8)
- direction (10)
- discontinuity (13)
- displacement (27)
- distribution (10)
- Drilling (6)
- effect (15)
- Engineering (43)
- equation (7)
- excavation (24)
- experiment (9)
- extraction (8)
- face (6)
- factor (6)
- failure (23)
- fracture (12)
- ground (11)
- health safety security environment and social responsibility (12)
- Horizontal (7)
- hydraulic fracturing (11)
- increase (6)
- investigation (6)
- knowledge management (7)
- laboratory (6)
- layer (6)
- Load (8)
- machine learning (15)
- management and information (50)
- mass (8)
- material (17)
- metals & mining (45)
- method (23)
- mining (6)
- model (31)
- MPa (8)
- neural network (6)
- particle (6)
- performance (8)
- pillar (11)
- plane (7)
- point (6)
- problem (6)
- project (15)
- reinforcement (6)
- relationship (8)
- renewable energy (6)
- research (10)
- Reservoir Characterization (132)
- reservoir description and dynamics (148)
- reservoir geomechanics (54)
- reservoir simulation (6)
- rock (107)
- rock mass (39)
- Rock mechanics (14)
- rock slope (8)
- roof (7)
- safety (12)
- sample (8)
- sandstone (10)
- seismic processing and interpretation (14)
- shear (9)
- shotcrete (6)
- slope (25)
- specimen (11)
- stability (26)
- strain (11)
- strength (36)
- stress (39)
- structural geology (30)
- structure (7)
- study (11)
- support (19)
- surface (15)
- system (18)
- technology (13)
- test (22)
- tunnel (34)
- University (34)
- Upstream Oil & Gas (134)
- water (16)
- well completion (16)
- Wellbore Design (6)

to

GoAn, Xinmei (School of Civil and Environmental Engineering, Nanyang Technological University) | Ning, Youjun (School of Civil and Environmental Engineering, Nanyang Technological University) | Ma, Guowei (School of Civil and Resource Engineering, University of Western Australia)

Open pit mining is a very cost-effective mining method. In open pit mining, pit slopes are formed. With the mining depths steadily increased to 500 meters or even higher, design of open pit slope angles is becoming more and more important. Small change in the overall pit slope angle has significant influence on the overall economy. An ideal design method must be able to i) predict where and under what conditions a failure surface may develop; ii) predict the kinematics of the failed slope. Current design methods can be distinguished into four groups: 1) empirical design method; 2) physical model tests; 3) limit equilibrium methods; 4) numerical methods. Among them, numerical methods have become popular in recent years. Currently existing numerical methods can be generally grouped into two categories: continuum methods (e.g. FDM, FEM, BEM, etc.) and discontinuum methods (e.g. the distinct element method with the commercial codes as UDEC, 3DEC, etc. and the discontinuous deformation analysis (DDA) [1]). Existing continuum codes are able to simulate the location and shape of the failure surface developing in a slope. However, an actual failure surface discontinuity is not formed. Pre-existing fractures are usually not incorporated. Discontinuum codes model the discontinuities presented in rock mass explicitly and have been successfully used to simulate structurally controlled failures. They are, however, difficult to simulate failures through intact rock. Actual slope failure involves both sliding along pre-existing discontinuities as well as fracturing through intact rock. A general method which can simulate the actual slope failure becomes essential. In this paper, the recently developed numerical manifold method (NMM) [2] is explored to account for complete rock slope failure process. Footwall slope is considered. Footwall slopes are often excavated parallel to dip and extensive along both strike and down-dip. When mining continues down-dip, the length of the exposed footwall slope increases and the potential instability of the slope may arise. Footwall slope instability is a relatively common occurrence in open pit mines situated in area of steeply dipping strata particularly where mountainous topography exists. The importance of footwall instability has long been recognized. Failures only occur along the pre-defined discontinuities. In this paper, non-persistent joints are allowed, both sliding along pre-existing discontinuities and fracturing through intact rock will be captured.

ISRM-ARMS6-2010-160

ISRM International Symposium - 6th Asian Rock Mechanics Symposium

analysis, bedding plane, case, cover, crack, criterion, discontinuity, failure, failure mechanism, footwall slope, metals & mining, method, NMM, Reservoir Characterization, reservoir description and dynamics, reservoir simulation, slope, structural geology, surface, triangular, University, Upstream Oil & Gas

Industry:

- Materials > Metals & Mining (1.00)
- Energy > Oil & Gas > Upstream (1.00)

SPE Disciplines:

Ghazvinian, Abdolhadi (Rock Mechanics Engineering Group, School of Engineering, Tarbiat Modares University) | Nejati, Hamid Reza (Rock Mechanics Engineering Group, School of Engineering, Tarbiat Modares University) | Hadei, Mir Raouf (Rock Mechanics Engineering Group, School of Engineering, Tarbiat Modares University)

Historical reports indicate that underground structures have different behaviors against earthquake with the same magnitude. This finding infers that the earthquake magnitude alone is not sufficient for determination of earthquake intensity. In other words, peak ground acceleration (PGA) that was calculated by attenuation relations is not enough criteria for determination of "design base earthquake" time history because, in addition to PGA, seismic loads frequency affect on the earthquake intensity. The aim of this study is to evaluate the effect of seismic load frequency on the behavior of underground structures. For this purpose, effective parameters on the frequency content of seismic loads were identified and two time histories with different frequency content were compiled. Further, Isfahan-Shiraz tunnel, a railway tunnel in southern part of Iran, located in a disturbed zone was analyzed for two separate time histories that have the same PGA and different frequency content. These analyses reveal that the frequency content of seismic load has significant effect on the earthquake load energy, stress distribution and underground structure stability. Furthermore, loads with higher frequency attenuate faster whereas, generally, loads with low frequency influence more, to compare with high frequency loads, on the structure stability.

1. INTRODUCTION

ISRM-ARMS6-2010-089

ISRM International Symposium - 6th Asian Rock Mechanics Symposium

Country:

- Asia > Japan (0.54)
- Asia > Middle East > Iran (0.35)

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.47)

Loui, John P. (Central Institute of Mining and Fuel Research (CIMFR)) | Rathod, Roshan A. (Central Institute of Mining and Fuel Research (CIMFR)) | Sinha, Amalendu (Central Institute of Mining and Fuel Research (CIMFR))

At Koyna Hydro-electric Project, an 80MW powerhouse is currently proposed at the left dam foot of Koyna river dam in Maharashtra. The underground powerhouse cavern needed for housing the two turbine units of 2 X 40MW is designed using three-dimensional numerical modelling. Three possible geometries for the powerhouse are designed considering the weaker rock mass layers of Volcanic Breccia existing in the vicinity of the proposed cavern. These configurations are simulated in FLAC3D software. Their stability is analysed using Hoek and Brown rock mass failure criterion. Taking cues from the stability predicted for the three configurations, a final configuration is designed. The final configuration is further subjected to threedimensional modelling and stability analysis. The cavern is expected to have good overall stability. The crown region, since it will be located in stronger Compact Basalt rock layer, will have superior stability. However, the cavern will have weaker sides, where Volcanic Breccia will be exposed. A support plan for the entire cavern is also designed incorporating 100mm thick steel fire reinforced shotcrete (SFRS) and 6.0m long full column grouted resin bolts.

Koyna Hydro-electric Project of Maharashtra State Government produces electricity of the order of 2000MW in four stages. This environmental friendly and cheap power generation caters to the energy demands of the neighbouring region. As an extension of Stage IV, an 80 MW (2x40 MW) capacity powerhouse is proposed at the Koyna dam foot at the left bank of the Koyna River. Underground powerhouse chambers are proposed for power generation. From the geological survey conducted by Koyna Project authorities, the rock types existing in this vicinity was found to be Deccan Trap Basalts, viz.

The intact rock properties tested earlier by CWPRS (Anon (2004) and Anon (2005)) and rock mass parameters such as RMR (Bieniawski (1976)) for compact basalt and volcanic breccia are given in Table 1. The Hoek and Brown rock mass parameters are also evaluated (Hoek and Brown (1980)) and given in the table since they are to be used in the numerical modelling.

A powerhouse cavern of 21m width, with crown level at 595m RL, and springing level at 588.5m RL A valve house of 10m width, with crown at 591.5m RL and springing level at 588.5m RL

ISRM-ARMS6-2010-074

ISRM International Symposium - 6th Asian Rock Mechanics Symposium

Industry:

- Energy > Power Industry (0.70)
- Energy > Oil & Gas > Upstream (0.69)
- Government > Regional Government > North America Government > US Government (0.54)

Sonmez, H. (Hacettepe University, Department of Geological Engineering, Applied Geology Division) | Ke, Kasapoglu (Hacettepe University, Department of Geological Engineering, Applied Geology Division) | Coskun, A. (Hacettepe University, Department of Geological Engineering, Applied Geology Division) | Os, Dinc (Canakkale Onsekizmart Universiy, Department of Geological Engineering, Applied Geology Division) | Tunusluoglu, C. (Canakkale Onsekizmart Universiy, Department of Geological Engineering, Applied Geology Division)

ISRM-ARMS6-2010-021

ISRM International Symposium - 6th Asian Rock Mechanics Symposium

Country:

- Asia (0.69)
- North America (0.68)

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)

The stability of slopes can be assessed by a factor of safety, which is usually determined by a limit equilibrium method. In order to evaluate the factor of safety, we need such strength parameters as cohesion and the internal friction angle. In the monitoring of slope stability, displacements are commonly measured. Therefore, the strength parameters should be evaluated from the measured displacements. Sakurai and Nakayama (1999) developed a back analysis procedure for determining the strength parameters from the measured displacements. The back analysis procedure was successfully developed by introducing both an “anisotropic parameter” and “critical shear strain”. Recently, on the basis of this back analysis procedure, a computer code called the “Universal Back Analysis Program for Slope Stability” (UBAPSS) has been completed. In this paper, UBAPSS is briefly described, and a case study is shown to demonstrate its applicability for assessing the slope stability at an open pit coal mine. The surface displacements were measured in the mine by GPS and the data were collected until failure occurred. The strength parameters were determined using the data obtained just one day before the failure occurred. The results of the back analysis indicate that the factor of safety becomes approximately 1.0. This means that the computer code UBAPSS is well applicable to the assessment of the stability of slopes.

ISRM-ARMS6-2010-156

ISRM International Symposium - 6th Asian Rock Mechanics Symposium

back analysis, back analysis procedure, critical shear strain, displacement, factor, knowledge management, management and information, open pit coal, plane, Reservoir Characterization, reservoir description and dynamics, safety, Sakurai, shear modulus, slope, slope stability, stability, strain, strength, Upstream Oil & Gas

Constructing mountain roads in harsh terrains is a challenge to the engineering and development of southwestern Saudi Arabia. Al-Baha 32 km-mountain road is constructed at steep slope rock masses, where many rockfalls incidents were experienced. A 100 m long portion of the road, suffers from frequent rockfalls. The rock masses are mainly igneous rocks of medium to low quality. The rock slope-cut has no bench for 20 m, 70Â°-90Â° inclination, and 30 m height. Absence of ditches and support systems aggravates the daily road conditions. The RocFall computer program was utilized to perform the risk analysis on such steep man-made and natural rock. Geotechnical parameters such as 1) block size, 2) seeder points of blocks falls, 3) slope angle, 4) restitution coefficients, and 5) slope roughness were used to identify properties of the potential and fallen rock blocks such as: 1) bounce height, 2) kinetic energies (total, translational, and rotational), and 3) translational and rotational velocities. The program modeled the 1) proposed location and energy of the rock blocks barrier's heights and locations, collectors, and 2) proposed slope safer redesign. The results of the study provide a solution to prevent rockfalls, and could be applied at similar conditions.

ISRM-ARMS6-2010-057

ISRM International Symposium - 6th Asian Rock Mechanics Symposium

al-baha descent, barrier, block, failure, geometry, management and information, path, program, redesign, Reservoir Characterization, reservoir description and dynamics, risk and uncertainty assessment, risk assessment, risk management, road, Rocfall Program, rock, rock block, rock slope, rockfall, rockfall risk reduction, Sadagah, seeder, slope, slope profile

SPE Disciplines:

Shahriar, K. (Professor, Mining Department, Amirkabir University of Technology (Polytechnic)Tehran) | Dehkordi, M.S. (PhD Candidate of Rock Mechanics, Sciences and Research University) | Lazemi, H.A. (PhD Candidate of Rock Mechanics, Sciences and Research University)

Estimation of mechanical properties of stones is very important because their measurements are cost and timeconsuming. The purpose of this paper is to investigate the relationship between compressive strength and the modulus of rupture of three types of stones as Granite, Calcite and Travertine groups of Iran. In this project all tests were carried out according to ASTM (American society testing of material) standard in laboratory, The obtained results show that the relationship of both properties of direct and is very little between correlation coefficients of linear equations and also nonlinear equations of all stone groups in most of zones of Iran By reason, it is preferred to use of linear equations based on their simplicity and easy application.

ISRM-ARMS6-2010-048

ISRM International Symposium - 6th Asian Rock Mechanics Symposium

The appropriate assessment of the strength of a jointed rock mass is a fundamental requirement for the successful design of structures built in or on rock. Due to the complexity of the rock mass, a large number of empirical methods are developed, for its estimation. Its analytical treatment has been tackled mainly by the plane of weakness theory. In this study, an extended plane of weakness theory is applied to a well documented jointed rock physical model. For the failure mechanisms observed in the experiment, the non linear strength envelope provided by this extended plane of weakness theory fits well to the experimental data.

Rock mass strength estimation belongs to the problems that are too complex to be tackled easily with analytical methods. Complexity is mainly due to fracturing, anisotropy inhomogeneity, and the variety of pertinent modes of failure. Therefore, empirical correlations, that do not need theoretical treatment, are usually employed. They come from the systematic observation of the factors that affect the strength. Analytical methods for the estimation of jointed rock strength have been developed, for the case of sparsely jointed rock masses. The most widely known analytical method for such a purpose is the plane of weakness theory, presented by Jaeger [1]. This method has been extended in order to take into account the roughness of joint surfaces. This extended method is presented and then, both the original and extended theories of weakness plane are applied to a jointed rock physical model.

2 THE EXTENDED THEORY OF WEAKNESS PLANE

The original theory of weakness plane (Jaeger, [1]) allows for the analytical evaluation of the anisotropic or equivalent isotropic strength of jointed rock. This theory uses the Mohr - Coulomb failure criterion for the joints. However, this linear criterion is unable to describe adequately the shearing behaviour of rock joints, which are rarely smooth, and their strength is a non linear function of the existing normal stress. Experiments ondiscontinuities have shown that for low normal stresses, the surface roughness causes expansion with shear movement, while for higher normal stresses there is failure of asperities and suppression of any expansion.

ISRM-ARMS6-2010-044

ISRM International Symposium - 6th Asian Rock Mechanics Symposium

angle, Barton, envelope, experiment, failure, Halakatevakis, intact material, jointed rock, jointed rock mass, original theory, plane, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, rock, shear, specimen, strength, stress, theory, Upstream Oil & Gas, weakness, weakness theory, Wellbore Design, wellbore integrity

SPE Disciplines:

Eftekhari, M. (Mining Engineering Department, Isfahan University of Technology (IUT)) | Baghbanan, A. (Mining Engineering Department, Isfahan University of Technology (IUT)) | Bayati, M. (Imen Sazan Consulting Ins., Tehran)

In tunneling a reliable prediction of advance rates is essential for calculating budget and construction time. Estimation of penetration rate is expressed as the basis for predicting advance rate in underground excavation using Tunnel Boring Machine. In this study the obtained data from 10KM of excavated Zagros tunnel project in Iran were subjected to statistical analyses using MATLAB for ANN modeling. When the neural network has been successfully trained, its performance is tested on a separate testing data set. Finally, the penetration rate was predicted by the trained neural network. The results show that the developed ANN method is efficient for predicting the PR in Zagros tunnel. The ANN model for next 0.5 KM which is recently excavated is well compatible with the real calculated PR of TBM in the field with 79% confident level. Result of sensibility analysis on the effect of Thrust and Torque on the PR shows that the maximum PR in given ground condition occurred in the optimum limits of Thrust and Torque.

1. Ground Condition: It includes characteristic parameters of intact rock and rock mass properties. Mostly reported important properties of intact rock in TBM performance are Uniaxial Compressive Strength (UCS), Brazilian Tensile Strength (BTS) and Point load index (Is50). In terms of Rock Mass properties, discontinuity spacing (Js), Rock Quality Designation (RQD), the angle between the tunnel axis and the planes of weakness (Discontinuity Dip and Dip Direction), rock mass quality using classification system such as RMR, Q and GSI have significant impact on TBM performance.

2. TBM operational parameters such as value of thrust, torque, Round Per Minute (RPM) and disc specifications have great influence on TBM performance. Tarkoy (1973) presented a model to predict penetration rate of TBM using only total hardness of intact rocks.

ISRM-ARMS6-2010-108

ISRM International Symposium - 6th Asian Rock Mechanics Symposium

Country:

- Europe (0.68)
- North America > United States (0.46)
- Asia > Middle East > Iran (0.36)

SPE Disciplines: Management and Information > Information Management and Systems > Neural networks (1.00)

Technology: Information Technology > Artificial Intelligence > Machine Learning > Neural Networks (1.00)

- Since the filling slopes are hillsideer than clay - core fillings, the body filling volume is less and it is possible to shorten the length of their discharge installations (spillway and derivation structures).

- Since zones numbered 1 (clay) and 2 (semi-permanent) do not exist, it is possible to continue work during rainy days and no damage is caused on agricultural lands - In case any problems that may increase leakage occurs on the front face, its repair is easy.

- The reservoir water load on the front face is safer since it is transferred to the base rock in the downstream of the dam axis.

- Under the reservoir water load + earthquake loads, high safety numbers are obtained since the material parameters do not change.

Furthermore, since there is no water movement within the dam, no space water pressure increases occur under earthquake vibrations and no decrease tendency is observed at sliding strength.

- Injection works can be performed in parallel with the filling construction. Base improvement requirement and cost cover the region only under the heel plate, therefore it is less than the other dam types.

- It is possible to construct ramps in any direction within the dam body. This minimizes the access ways in the dam.

ISRM-ARMS6-2010-129

ISRM International Symposium - 6th Asian Rock Mechanics Symposium

Thank you!