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**Concept Tag**

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**File Type**

**Abstract: **Rocks often experience high temperatures (several hundred degrees Celsius) due to underground operations, such as deep geological disposal of nuclear waste, geothermal heat extraction, CO2 geological storage and underground coal gasification as well as deep mining. Laboratory studies have shown that mechanical properties such as compressive strength, tensile strength, elastic modulus, etc. of rocks such as granite, marble and sandstone are temperature and temperature-history dependent. Therefore, the conventional failure criteria may not be suitable enough under high temperature conditions. In the present study, a thermo-mechanical modified Mohr-Coulomb failure criterion is proposed based on the extensive review and interpretation of mechanical properties of granites exposed to high temperatures. The deduced criterion takes into consideration the effects of thermal damage and confining conditions. The numerical study indicates that the proposed criterion provides a higher quality depicting rock strength under high temperatures compared with the conventional Mohr-Coulomb criterion. Moreover, according to analyses of the behavior of other rock materials exposed to high temperatures, this criterion is also suitable for other rocks.

Rock-mechanical engineering in high temperature environments is of universal interests and a challenge to scientists and engineers of different disciplines. Rock mass may undergo high temperatures (several hundred degrees Celsius) in modern projects, such as deep underground nuclear waste disposal (Bergman 1980, Rutqvist et al. 2008), geothermal heat extraction (Zhao 2000, Zhao 2002), geological CO2 storage (Roddy & Younger 2010) and underground coal gasification (Burton et al. 2007, Kühnel et al. 1993), as well as deep mining (Zhou et al. 2005, He 2009). Under the action of high temperature, the micro-structures of rocks change significantly (Dwivedi et al. 2008), new micro-cracks are developed, and pre-existing ones are extended/widened (Den''gina et al. 1994). Meanwhile, various physical and mineralogical changes take place within these rocks.

ISRM-EUROCK-2012-101

ISRM International Symposium - EUROCK 2012

Chinese, condition, criterion, decrease, dwivedi, Engineering, Eurock, failure, granite, mechanical property, mohr-coulomb failure criterion, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, rock, Rock mechanics, strength, tensile strength, underground coal gasification, Upstream Oil & Gas, Wellbore Design, wellbore integrity, Westerly granite

SPE Disciplines:

Modern pump storage schemes allow immediate production of peak current upon demand. Due to the availability of modern shaft construction methods, vertical penstocks may serve as an alternative to common inclined shaft solutions with steel lining. Even though, economic considerations may favour the implementation of a concrete lining in order to minimize head losses and thus allow smaller excavation diameters and the abdication of a rock trap.

ISRM-EUROCK-2012-149

ISRM International Symposium - EUROCK 2012

approach, concrete lining, crack, design, design approach, groundwater, hydraulic conductivity, internal water, loss, renewable energy, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, rock mass, seepage, shaft, State, stress, tangential stress, Upstream Oil & Gas

Industry:

- Energy > Oil & Gas > Upstream (0.91)
- Energy > Renewable > Hydroelectric (0.71)
- Energy > Power Industry > Utilities (0.61)

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.89)

Percussive rock drilling is extensively used in mining and construction industry. The ability to simulate rock fracture numerically is an important asset in rock drill design as it considerably diminishes the need to manufacture prototypes and testing appa-ratus. For a literary review on the state of the art in the field, the reader is referred to a paper by Liu et al. (2008). This paper presents a numerical method for the simulation of the dynamic bit-rock interaction process in percussive drilling.

ISRM-EUROCK-2012-037

ISRM International Symposium - EUROCK 2012

SPE Disciplines:

- Well Drilling > Drill Bits (1.00)
- Reservoir Description and Dynamics (1.00)

This paper defines the concept of combining lateral earth pressure theories with the convergence-confinement method (Carranza-Torres and Fairhurst, 2000). The primary and specific purpose of this investigation was to capture the support-rock interaction/mechanics associated with the forepole temporary support elements (as seen in Figure 1). This support type is only a singular component of the overall temporary support scheme associated with the overall system of temporary support that is used primarily in tunnel construction in weak rock conditions. The forepole umbrella creates a stable excavation environment. One postulated mechanism of support is the redirection of 3D stress flow around the tunnel (Gibbs, et al., 2007). This concept has also been labeled the arch effect by (Lunardi, 2000). This aid in stress flow is said to minimize pressure at the tunnel face.

ISRM-EUROCK-2012-057

ISRM International Symposium - EUROCK 2012

analysis, coefficient, condition, displacement, excavation, face, forepole, forepole support, interaction, lateral earth, management and information, numerical model, pile, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, rock, rock mass, stress, support, tunnel, Upstream Oil & Gas, weak rock

SPE Disciplines:

1 INTRODUCTION

The safety and stability of underground structures are often affected by blast induced waves which may come from an accidental explosion, the drill and blast excavation or weapon attacks. Since the underground structures are surrounded by jointed rock mass, the blast wave propagation in the rock mass is significantly influenced by the joints. The vastly existed joints in rock mass not only affect the mechanical properties of rock mass, but also their dynamic response (Goodman 1976). Therefore, studying the interaction between blast wave and joints has been drawing more and more attention (Berta 1994). The blast wave due to an explosion moves outward from the source rapidly and acts on the surrounding media by an effectively instantaneous rise in pressure followed by a decay of wave propagation in the rock mass (Henrych 1979). From a relative distance of the explosive centre, the blast wave is changed to an elastic wave and finally attenuated completely because of the energy dissipations both geometrically and mechanically. The interaction between a blast-induced stress wave and rock joints which relies on the impinging angle, type of the incident wave and the joint property mechanically dissipates the blast energy (Henrych 1979).

ISRM-EUROCK-2012-040

ISRM International Symposium - EUROCK 2012

angle, blast wave, Eurock, incident, interaction, joint, jth joint, method, parallel joint, propagation, Reservoir Characterization, reservoir description and dynamics, rock, rock joint, rock mass, seismic processing and interpretation, Upstream Oil & Gas, Wave, wave propagation, wave propagation equation

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)

Rapid increase of population in Istanbul results in the need of new infrastructure systems. The growing demand made by consumers on the (limited) available space, combined with higher demands on the quality of newly realized structures, forces decision-makers to make extended use of the third dimension, and in particular the available subsurface space.

ISRM-EUROCK-2012-045

ISRM International Symposium - EUROCK 2012

condition, cutterhead, Eurock, fractured rock mass, kadikoy, kartal metro, management and information, Modeling & Simulation, penetration, performance, project, relationship, Reservoir Characterization, reservoir description and dynamics, revolution, rock, specific energy, structural geology, TBM performance, thrust, torque, Upstream Oil & Gas

SPE Disciplines:

Figueiredo, B. (National Laboratory for Civil Engineering – LNEC) | Lamas, L. (National Laboratory for Civil Engineering – LNEC) | Muralha, J. (National Laboratory for Civil Engineering – LNEC) | Cornet, F. H. (Institute de Physique du Globe de Strasbourg – IPGS)

The design of Paradela re-powering scheme requires a sound understanding of the regional stress field, since the state of stress is frequently the main load to be considered in the design of underground works in rock masses. The determination of rock stresses is a great challenge, due to its spatial variability and the many factors that influence it. Overcoring tests (OC), hydraulic fracture tests (HF), and hydraulic tests in pre-existing fractures (HTPF) were carried out in order to characterize

ISRM-EUROCK-2012-008

ISRM International Symposium - EUROCK 2012

borehole, component, direction, distribution, effect, gravity, hydraulic fracturing, location, Magnitude, numerical model, orientation, principal stress, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, rock mass, stress, tectonic loading, test, topography, Upstream Oil & Gas, variation, well completion

SPE Disciplines:

Copur, H. (Istanbul Technical University) | Balci, C. (Istanbul Technical University) | Bilgin, N. (Istanbul Technical University) | Tumac, D. (Istanbul Technical University) | Avunduk, E. (Istanbul Technical University)

1 INTRODUCTION

Predicting excavation or cutting performance of any mechanical miner is very important especially in feasibility stage for excavation of any given rock, stone, mineral, ground or formation type. Mechanical miners convey their power and force capacity to the rock mass or ground by cutting tools (cutters, bits). Therefore, proper selection of cutting tools for any given mechanical miner and ground is very crucial for success-ful and economical excavation. When choosing a tool for a ground type, many parameters should be considered together such as machine type-specifications-capacity, ground cuttability-strength-abrasivity-texture-hard mineral content, tool lacing on cutterhead-tool consumption rate and cutting capability/performance. Selection of suitable cutting tool, which also leads to optimized design of cutterhead and specifications of the mechanical miner, is mainly based on comparison of their cutting performance and tool costs for a given formation.

ISRM-EUROCK-2012-041

ISRM International Symposium - EUROCK 2012

Brazilian, breakout angle, chisel tool, cut, excavation, machine, mechanical property, performance, relationship, Reservoir Characterization, reservoir description and dynamics, rock, specific energy, strength, tensile strength, test, tool, uniaxial compressive, Upstream Oil & Gas, Wellbore Design, wellbore integrity

SPE Disciplines:

ISRM-EUROCK-2012-093

ISRM International Symposium - EUROCK 2012

apse, APSE Experiment, borehole, damage, diameter, experiment, fracture, granite, heater, heating, heating hole, hole, hydraulic fracturing, laboratory, pillar, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, rock, rock mass, strength, stress, Upstream Oil & Gas, wall, well completion

SPE Disciplines:

The seasonal storage of natural gas in salt caverns has been practiced since some dec-ades successfully. Nowadays new operation modes are aimed at, which are character-ized by high withdrawal rates and possibly more than one pressure cycle per year. The main differences between seasonal and cyclic storage operations have been pointed out by Staudtmeister & Zapf (2010). This is important because no gas flow doesn’t mean that the state variables like cavern temperature and stresses in the rock mass remain un-changed during this period.

ISRM-EUROCK-2012-145

ISRM International Symposium - EUROCK 2012

SPE Disciplines: Reservoir Description and Dynamics > Storage Reservoir Engineering > Natural gas storage (1.00)

Thank you!