... specimens with machined asperities. The artificial seams were consolidated at 3000 psi hydrostatic stress, and the excess pore fluid was drained. During consolidation, the clay seams hardened and reduced to about one-fourth of their unconsolidated thickness. Direct shear tests were performed...

... and their source characteristics as well as their effect on rock engineering structures. In this study, despite some difficulties, the author would propose a general procedure to simulate shear loads in direct shear tests of discontinuities and interfaces due to ground motions caused by earthquakes. Furthermore...

... of interaction in both numerical and experimental analyses. In this study, we conducted a set of Direct Shear Tests on Opalinus Clayshale specimens employing a shear box to obtain the coefficient of friction and cohesion of the sliding surfaces. Two conditions were tested: vertical and horizontal bedding planes...

... direct shear test predict side shear resistance shear resistance stiffness pile-rock interface side shear resistance 1. INTRODUCTION Rock-socketed piles loaded axially might transfer the working load by the combination of base and side shear resistance, or only by base or by side shear resistance...

... and failure profile in direct shear test and on the stress relaxation behavior in the post-failure region. Reservoir Characterization rock joint shear plane JRC viscous behavior normal stress strength specimen plane Upstream Oil & Gas direct shear test failure plane time-dependent...

... strength reservoir geomechanics strength mechanism direct shear test shear displacement 30-degree asperity University 1. INTRODUCTION The design of rock slopes, foundations, tunnels, dams and underground space is strongly dependent on reliable estimations of mechanical properties of rock masses...

... geometry and stress conditions. In this work, 22 broken rock surfaces were scanned using an Advance Topometric Sensor (ATS) and consequently tested in direct shear. The quantified surface measurements were analyzed with the dilation responses from the direct shear tests. Based on directional analysis...

... be accelerated under thermal conditions. In this study, the direct shear tests under a slide-hold-slide process, using artificial rock (mortar), granite and andesite with a single natural rough joint, have been performed at 20 and 60 °C. Through the experiments results, the shear strength healings can...

... with increasing degree of scalping. In addition, sieving analyses were carried out before and after the direct shear tests on the 75 mm, 37.5 mm, and 19 mm scalped specimens, to assess the degree of particle breakdown on loading and shearing. The results imply that small-scale laboratory testing of aggregates...

.... This problem increases the shear strength of the joint when the shear displacement of the joint exceeds a specific value and creates unwanted fractures around the intended joint plane. To solve this problem a new approach termed joint side checking (JSC) is proposed. Numerical modeling of the direct shear test...

... ABSTRACT: Current standard multi-stage direct shear test methods for rock joints do not consider the individually unique asperity profile and nature of the testing specimens. These techniques require either the shearing of a single sample under multiple normal loads, or the shearing...

... visualization and modeling tools. In particular, until recently it was not possible to observe asperity damage without physically separating the joint specimen or explicitly modeling the development of damage during a direct shear test. interface hydraulic fracturing strength upstream oil & gas...

... are internal friction angle and interface friction angle on the cutter face. Direct shear tests are used to find the internal friction angle of soils. It is one of the earliest and simplest methods for testing the strength of soils [6, 7]. Frictional forces on PDC cutters were first studied by Hibbs...

... sawtooth rock joint normal stress condition mode iii reservoir geomechanics sawtooth interface simulation result crack propagation strength rock joint upstream oil & gas sawtooth angle failure mode structural geology direct shear test shear strength shear resistance rock...

.... Synthetic joint profiles with single and multiple asperities with base angles 20 and 30 degrees were prepared and direct shear tests under CNL and CNS with different initial normal stresses were carried out. Results of this study showed that the experiments conducted under CNS led to higher shear strength...

... on the log t healing law. This is because the dominant factor in the shear strength recovery during holding may be attributed to a purely mechanical process, like creep deformation at the contacting asperities. Upstream Oil & Gas direct shear test specimen rock fracture shear strength recovery...

... before and after being subjected to a direct shear test. reservoir geomechanics roughness rock joint Artificial Intelligence joint surface direct shear test Reservoir Characterization Upstream Oil & Gas Rock mechanics investigation dip angle wind plot histogram unit normal vector...

... (veins) on rockmass strength. Triaxial and direct shear test data were generated numerically for a theoretical andesitic tuff using FEM. The triaxial results were applied to a deep underground mine drift design case. Direct shear results were compared to an open pit slope case. The approach previously...

... explicitly and track the crack initiation and propagation inside the sample. Therefore, PFC can model the influence of joint roughness and asperity degradation during direct shear test. The most common method in PFC for generating joints in direct shear test is bond removal method. In this approach...

... judgments of experienced rock mechanicists. This work attempts to deliver more realistic residual strength parameters for artificial slip planes produced in triaxial and direct shear tests performed on shale samples. These artificial planes do not account for rock heterogeneity, fault roughness or breached...