... is determined from the interlocking structure and joint surface conditions. reservoir geomechanics strength experiment Artificial Intelligence material property non-persistent joint Reservoir Characterization GSI value rock mass block size estimation Engineering GSI system discontinuity...

... the stability and the economical efficiency of underground construction procedures, especially for civil engineering sites. orientation brittle failure characteristic reservoir geomechanics Korea average orientation excessive horizontal stress Reservoir Characterization stress ratio borehole...

... and acid into the environment. 1 INTRODUCTION Natural weathering cannot be generally recognized due to its slow rate, whereas we sometimes find that rock containing pyrite FeS2) which has been exposed to the atmosphere is considerably weathered in a relatively short period. reservoir...

... Feldspar sonic travel time compaction compressive strength vertical stress reservoir geomechanics carbonate cement porosity diagenesis porosity reduction cement sandstone chemical compaction vertical strain 1 INTRODUCTION 1.1 Introduction After sands are deposited they become sandstones...

... hole full drilling process original dpm data drilling process reservoir geomechanics rock mass drill bit position Upstream Oil & Gas drill bit depth automatic drilling process mechanical strength rock mass quality Hong Kong pneumatic rotary-percussive drilling machine 1 INTRODUCTION...

... that the presence of cracks affects the strength and mechanical properties of a rock. reservoir geomechanics crack density polygonal block Reservoir Characterization material property borehole shear modulus Upstream Oil & Gas Chandler tsx tunnel seismic velocity EDZ dynamic shear modulus...

... Characterization Upstream Oil & Gas calculation reservoir geomechanics aperture size fluid flow aperture normal stiffness flow distribution pattern excavation hydraulic aperture fracture characterization friction angle tunnel stiffness fracture property geometry HM analysis inflow 2007...

... and density of internal flaws and heterogeneity. reservoir geomechanics strength machine learning Upstream Oil & Gas criterion initiation rockmass threshold tunnel diederich 2007 Reservoir Characterization transition function Martin Artificial Intelligence dilation hard rock...

... fractures. reservoir geomechanics Upstream Oil & Gas strain concentration rule Reservoir Characterization reservoir simulation asperity degradation hydraulic fracturing homogenized poromechanical behavior degradation Plesha fracture hydromechanical behavior tensor marmier...

...) and borehole slotting (Bock & Foruria 1983); borehole breakout measurements (Zoback et al. 1986); indirect methods such as acoustic emission measurements (Kaiser 1950), etc. reservoir geomechanics plane perpendicular tangential stress hydraulic fracturing borehole stress measurement Upstream...

... Upstream Oil & Gas effective stress path mean effective stress shear stress reservoir geomechanics shale jur pre-consolidation stress shear strength triaxial test vertical strain Reservoir Characterization shear failure MPa shear fracture shear stress-vertical strain curve...

...) on the coalescence behavior experimentally (Reyes & Einstein 1991, Shen et al. 1995, Bobet & Einstein 1998, Ko et al. 2006, Wong & Einstein 2006). oilfield chemistry rock/fluid interaction reservoir geomechanics chemical treatment marble tensile Reservoir Characterization Production...

... & Manghani 1997, Siggins & Dewhurst 2003). Upstream Oil & Gas Castlegate sandstone expression effective stress law volumetric strain sandstone elastic property Reservoir Characterization pore pressure MPa effective stress coefficient p-wave velocity reservoir geomechanics regime...

... real time system Upstream Oil & Gas variation Reservoir Characterization damage development specimen triaxial compression rock mass reservoir geomechanics strength initiation brittle material compression flaw pressurized water hydraulic fracturing fracture process hydraulic...

... in the same direction), the jointed rock mass can be idealized as a special continuum material with a special set of material properties. hydraulic fracturing aperture Reservoir Characterization complex reservoir joint cohesion 0 reservoir geomechanics Upstream Oil & Gas Simulation...

... and intact fracture of rock bridges. The simulation of step-path failures has received new momentum with the development of deeper large open pits and their interaction with underground mines. reservoir geomechanics Einstein Reservoir Characterization Upstream Oil & Gas complex reservoir...

... may be described as an active wedge and the support must be designed to stabilize this wedge. Upstream Oil & Gas Piezometer rock cut reservoir geomechanics strength cohesion air transportation displacement site investigation sequence investigation rock excavation Reservoir...

... strength sc of rock media typically varies with size. On Figure 1, the unit bock is defined as the maximum size of intact rock units in situ (between geological discontinuities). Reservoir Characterization Simon scale strength reservoir geomechanics strength metals & mining equation 2...

...-effective design of such structures. However, the determination of the global mechanical properties of a jointed rock mass remains one of the most difficult tasks in the field of rock mechanics. Upstream Oil & Gas Simulation reservoir geomechanics criterion GSI system block size strength...

... (or in-plane shearing mode) and Mode III (or out-of-plane shearing mode). reservoir geomechanics strength Loading Rate experimental result Upstream Oil & Gas flagstaff sandstone short beam compression test hydraulic fracturing microcrack specimen Reservoir Characterization intensity...