... 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 presents...

... 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...

... ° ; 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...

...) PC R A 22 3 2 2 (6) According to formula (3) to formula (6), the coefficients Aj, Cj can be solved. The results which are very complicated are not listed here. Then the expressions of the normal stress of surrounding rock and lining can be obtained. Based on the calculation by the developed source...

... 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...

... Wellbore Design normal stress asian rock mechanics symposium 29 wellbore integrity strength rock joint shear test rock mass reservoir simulation Thickness numerical simulation shear strength Reservoir Characterization Upstream Oil & Gas isrm international symposium double...

... 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...

... 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...

... 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...

.... 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...

.... abutment in-situ shear test jointed rock mass Shear Strength Parameter displacement normal stress shear displacement Upstream Oil & Gas normal load material research station shear stress foliation joint shear test Reservoir Characterization friction angle shear zone MPa rock mass bank...

... flow through the joint. Upstream Oil & Gas nuclear waste repository deposition hole hydraulic fracturing cavern experiment aperture normal stress hydromechanical behaviour Olsson repository deposition tunnel hydraulic aperture rock mass tunnel Barton rock joint shear...

... 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...

... 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...

... kilometers depth. Deep-well measurements demonstrate that fractures that are under differential shear stress are more likely to be water conducting, and those that are principally under normal stress are less likely to be water conducting. In this paper, alternative interpretations of shear-wave polarization...

... acting on a 2D rock wedge adjacent to a circular tunnel in a plane hydrostatic stress field. metals & mining natural stress field normal stress Upstream Oil & Gas resistance ks kn 1 progressive failure reservoir geomechanics displacement semi-apical angle joint face Reservoir...