... ° ; σ 3 =5.01, N62.86 ° E ∠ 63.86 ° . The M-HTPF method offers a new access to determine a complete stress tensor using a single borehole. 1. Introduction In 1984, Cornet and Valette proposed that the hydraulic test on pre-existing fractures could be utilized to measure the normal stress...

... gradually attracted people's attention. Artificial Intelligence insulation renewable energy geothermal reservoir isrm international symposium Upstream Oil & Gas geothermal energy normal stress enhanced geothermal system excavation technology rock mass asian rock mechanics symposium 29...

... and in the dilation-induced shear displacement behaviors of rock joints under variations normal stress and JRC values. In the future, the linearized Barton's model has the potential to be applied in computer codes for fractured rock modeling. By implementing this model, neither the simplicity of the linear M-C...

... the laboratory experiments, where the smooth cleavage joints were generated by sawing off and the rough joints were generated by the Brazilian Split test. The experimental results of double joints of sandstone show that, under lower normal stress the interlayer rock between two joints does not fracture...

... by having an intact strength within the range 20–80 MPa. Only samples of clean natural partings were prepared at the laboratory and then tested by single-stage and multi-stage procedures using a servo-controlled shear box, to ensure the application of constant normal stress throughout each test. This paper...

... vulnerable to occur during the injection. It is regarded that the fracture initiation or breakdown happens when the normal stress at this monitoring point is reduced to zero. Fig. 1. Model configuration for hydraulic fracturing test The Voronoi blocks follow an elastic behavior and these incipient fractures...

... Reservoir Characterization reservoir geomechanics geothermal reservoir pore pressure initial effective normal stress Upstream Oil & Gas displacement isrm international symposium flow in porous media Fluid Dynamics natural fracture asian rock mechanics symposium 29 fracture...

... proven to be an effective method for preventing and treating rock burst. Upstream Oil & Gas rapid stress release method stress state metals & mining relaxation area normal stress rock mass construction Reservoir Characterization renewable energy dynamic disturbance Control...

... allowing the evaluation of asperity breakage and surface wear. One of the joint specimens was tested under several normal stresses, which allowed the estimation of its mechanical characteristics, and was scanned after each test to evaluate the influence of the normal and shear load on the variation...

... along which joint offers least resistance to shear stresses. The direct shear test is conducted under constant normal load (CNL) condition with three normal stresses 150 kPa, 300 kPa and 450 kPa. Because of quarter symmetry of the specimen four direct shear test have been carried out at angle...

... is applied while the shear displacement and water head drop are monitored for every 0.5 mm interval of shear displacement. The fracture hydraulic conductivities decrease exponentially with increasing normal stresses. The physical and hydraulic apertures increase with shearing displacement, particularly under...

... and was tested under constant normal load (CNL) boundary condition, and the range of normal stress was 0.1–0.7 (MPa) applied by a pair of pneumatic cylinders. Experimental results show that the shear displacement curves exist obvious stick-slip phenomenon especially in low shear rate and high normal stress...

.... The diametrical loads are progressively increased from 0.63MPa to 1.85MPa. Finite difference analyses have been performed to calculate the normal and shear stress distributions on the fracture under various orientations. The results indicate that the increases of the normal stresses rapidly decrease the fracture...

... strength and elastic modulus are 1.22 MPa and 224 MPa which are similar to those of bentonite mixed with cement. The shear strengths between the grouts and fractures surfaces are from 0.22 to 0.90 MPa under normal stresses from 0.25 to 1.25 MPa. The S:C ratio of 5:10 gives the lowest permeability...

... wooden wedges placed across the jack. The shear force was applied until the failure occurred. Minimum of five such blocks were prepared for each set of shear test. Each block was tested for a particular normal stress which was kept constant during the test. The shear force and displacement of block were...

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... rock joint. The test results for the non planar joint indicates that CNS boundary conditions yield a higher peak shear stress than that under CNL boundary condition for the same initial normal stress. A detailed account of deformation behaviour is discussed in this study. INTRODUCTION The correct...

... acting on a 2D rock wedge adjacent to a circular tunnel in a plane hydrostatic stress field. metals & mining natural stress field normal stress progressive failure Reservoir Characterization strength wedge stability reservoir geomechanics displacement semi-apical angle vertical...

... the decrease in joint wall strength due to weathering and alteration. The shear stress was loaded by horizontally moving the boundary walls at a constant velocity, while the normal stress was controlled by a numerical servo algorithm. Micro-cracks and contact force distribution, as well as the shear and normal...