... of the researcher. To remove this bias, the root mean square first derivative values (Z 2 ), a statistical numerical parameter, is revealed, which is also easily to be determined. upstream oil & gas root mean square method mechanical property joint roughness coefficient strength definitional jrc...

.... Yasuhara (Eds) 511 The effect of uniaxial compressive strength of the filling material on the shear strength of the filled joints in limestone rocks. A. Khodabakhshi* and A. Shahbazib a Amirkabir University of Technology Rock Mechanics Dep, Tehran, Iran b Islamic Azad University Tehran North, Tehran...

... influence the strength of specimen. Moreover, the simulations show that increasing the pre-existing porosity reduces specimen strength, due to the concentration of stress around the voids, and that intra-granular cracking is the dominant contact damage mechanism during uniaxial compression. 1...

.... The physico-mechanical properties such as compressive and tensile strength, porosity and dry density served as input parameters for the prediction of CAI. A comparative analysis of various performance indices has been conducted in order to establish the efficiency of the developed models. The results suggest...

... sandstones, indicating glutenite samples are more ductile than sandstone samples Thus, there are mainly three types of rock failures for glutenite, namely fracture termination, deflection and penetration, which all controls by combining effects of gravel strength and confining pressures. Fracture deflection...

... shear tests were conducted under the dried and immersed conditions to measure a residual strength (τ res ) of the specimen. In a direct creep shear test, the specimen was subjected to immersion under creep shear stress conditions (σ v = 25, 100 or 200 kPa, τ = Rσ v , R = 0.7~1.0). After the creep shear...

... Artificial Intelligence strength calculation wattimena design curve mass property Dealing with Uncertainties in Rock Mechanics Ridho K. Wattimena a * a Institut Teknologi Bandung, Indonesia *rkw@mining.itb.ac.id Abstract Properties of rock mass vary and an exact value of one of the properties at any...

... strength tangent vector Probe test borehole Research on Multi - frequency Ultrasonic Scanning Detecting Technology of Cavity in the Test Borehole WANG Jinchao a,b* WANG Chuanying a TANG Xinjian a a Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics...

...-slip with a linear slip-weakening law employing Barton's shear strength model. Model parametric studies with respect to d c and mining depth are performed, and seismic efficiency is computed for each model. The results show that when d c ranges from 1.0 cm to 2.5 cm, the analyses yield reasonable...

... system in field to evaluate the degree of fire-damage readily for both brittle and ductile tunnel supporting materials, this research focused on the failure characteristics and evolution on both macro-scale (stiffness, strength and toughness) as well as micro-scale (localization, crack initiation...

...@aalto.fi (corresponding author s E-mail) Abstract In Finland and Sweden, the geological nuclear waste disposal is heading for the implementation phase in the next ten years or so. In the disposal concept, the knowledge of the rock mass strength and in situ rock stresses are important for long-term safety...

... studied by particle-flow-code (PFC) simulation. The results show that different unloading rates ( t ) and flaw inclination angles result in variations in the unloading strength, deformation and crack effect for the pre-flawed specimens. Compared with intact specimens (without pre-flaws), the unloading...

...Loading Rate Dependency of Strength and Fracture Toughness of Rocks Tae Young KO a *, John KEMENY b and Seokwon JEON c a SK Engineering & Construction, Seoul, Korea b University of Arizona., Tucson, U.S.A. c Seoul National University, Seoul, Korea *tyko@sk.com (corresponding author s E...

... well drilling, and hard rock breaking. Therefore, a method of impact-shear is proposed on shale breaking. reservoir geomechanics Wellbore Design strength drilling fluids and materials relation shale gas Upstream Oil & Gas Rock mechanics specimen Science Foundation geomechanics...

...-reacted (H2O-immersed) specimens. The concentration of DOC, which is the substrate of methanogen cultivation, increased due to the oxidation of lignite at decreased pH by H2O2. P-wave velocity showed positive correlations with strength, static tangent modulus, and dynamic Young s modulus. The average P...

... processes like those used in tunnel boring, a modeling parameter in processes such as rock cutting and hydraulic fracturing and for the stability analysis of civil, mining and earthen structures. hydraulic fracturing fracture toughness specimen splitting loading method strength brazilian disc...

... model and the hybrid model. Basic models are divided into contact stiffness model and con- tact model, parallel and disconnected contact cate- gories (Zhou et al. 2009). Because equal connection model can be passed between the force and torque, parallel connection strength and strength of rock material...

... gravity stress. In other words, the stress in horizontal direction was higher than that in vertical direction. Reservoir Characterization strength calculation excavation Wellbore Design Chinese Journal MPa rock mass Upstream Oil & Gas roadway excavation parameter value ii zone...

... were used to analyze the failing mechanism of rocks. Also, the AE characteristics and their corresponding stress in each stage of failing process were described, so as to indicate the strength envelope of crack initiation, crack damage strength, peak strength and residential strength. At last...

... experiments to study its physi- cal and mechanical properties in engineering, espe- cially the softening and disintegrating properties. Wang eta!. (2010) found that tertiary soft rock was mainly composed of mixed-layer montmorillonite and illite, characterizing with lower strength, light cementation...