biaxial test rock compression shear band|Shear Band Formation in Biaxial Compression Test : department Store A biaxial test is a scientific procedure used to determine the elastic constants of a material, such as rock, by subjecting it to pressure in two perpendicular directions and analyzing the strain .
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In this paper, an elasto-plastic micro-polar (Cosserat) model is proposed to capture the formation of shear band in biaxial compression tests. The development of a localized damage zone or shear band in rock was studied through numerical and physical experiments. A laboratory biaxial (plane strain) compression .
In this study, a flexible membrane boundary condition is applied to simulate the shear behavior of granular assemblies of irregular shapes in a biaxial test by DEM in 2D since . A series of plane-strain biaxial compression tests on dry coarse sand is described in which the state of shear-band formation, shear-band orientation, and shear-band growth . This research captures and compares the variation in microstructure both inside and outside of shear bands that formed in physical laboratory plane strain and companion .
A biaxial test is a scientific procedure used to determine the elastic constants of a material, such as rock, by subjecting it to pressure in two perpendicular directions and analyzing the strain .The spontaneous shear band formation in the biaxial test on dry sand samples with constant cell pressure is treated as a bifurcation problem. The constitutive response of sand is described . The results show that for S-RM with a high content of rock block, translation, rotating and breakage of rock blocks have crucial effects on mechanical behavior of S-RM. . In this study, a series of biaxial compression tests were conducted using granite specimens featuring an oblique circular hole to investigate crack propagation and failure .
A biaxial compression apparatus for investigating shear-band formation and growth in dry and water-saturated sand and clay specimens is described. This apparatus is a . The undrained shear test plays a crucial role in comprehending the deformation and failure mechanisms inherent in rock and soil. While the test offers a macroscopic perspective, numerical simulations can delve into the microscopic aspects of sample behavior, thereby compensating for this limitation.
A biaxial test is a scientific procedure used to determine the elastic constants of a material, such as rock, by subjecting it to pressure in two perpendicular directions and analyzing the strain gauge responses for linearity and deviations. . Most experimental studies of shear bands have been conducted as plane-strain biaxial compression . Statistical distributions of particle orientation within and outside the shear band were calculated: they show that most particles inside the shear band orient in the x-y plane towards the y-axis . XU Wen-jie, XU Qiang, HU Rui-lin. Study on the shear strength of soil-rock mixture by large scale direct shear test [J]. International Journal of Rock Mechanics and Mining Sciences, 2011, 48(8): 1235–1247. . MAHMOOD Z, IWASHITA K. A simulation study of microstructure evolution inside the shear band in biaxial compression test [J .
Two types of shear failure were found in biaxial tests: single shear band and two conjugated shear bands. According to the comparison of the probability of force chains oriented in [40o, 60o] and [120o, 140o], a single shear band occurs within the angle range with obviously less probability, while two conjugated shear bands occur when the . ABSTRACT A series of plane-strain biaxial compression tests on dry coarse sand is described in which the state of shear-band formation, shear-band orientation, and shear-band growth are investigated. The results show that both the shear strain at shear banding and the shear-band orientation depend on the confining pressure. The experimental results are .
A series of biaxial (plane strain) experiments were conducted on three sands under low (15 kPa) and high (100 kPa) confining pressure conditions to investigate the effects of specimen density, confining pressure, and sand grain size and shape on the constitutive and stability behavior of granular materials. The UCS is also a significant parameter for characterization of the mechanical properties of the rock/rock mass (Zhang et al., 2011).In scientific research, the UCS is useful to analyze the mechanical and fatigue behavior of rocks (Alizadeh et al., 2023; Haeri et al., 2023).A series of experiments and numerical simulations based on uniaxial compression test have .The spontaneous shear band formation in the biaxial test on dry sand samples with constant cell pressure is treated as a bifurcation problem. The constitutive response of sand is described in terms of mobilized friction and dilatancy. Dilatancy is looked upon as an internal constraint and the hardening rule is expressed in terms of an adequate .
Shear band inclination and shear modulus of sand in biaxial tests
A biaxial compression apparatus for investigating shear-band formation and growth in dry and water-saturated sand and clay specimens is described. This apparatus is a modification of the device designed by Vardoulakis and Goldscheider [1] for testing planar shear banding in sands. The modifications involve improved axial load guidance, low friction linear .Triaxial Compression Test in Rock. Laboratory Testing Rock Engineering; Rock Failure and Triaxial Testing (Credits: FANARCO Net) Contents [hide show] Introduction; . Introduction The Direct Shear Test is an experimental procedure conducted in geotechnical engi. Soil Consolidation and Oedometer Test May, 07, 2020 | Education.
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Based on biaxial rock testing machine and the idea of component force in variable angle shear tester (Xiao et al. 2018), the horizontal uni-direction uniaxial loading of biaxial testing apparatus is transformed into uni-direction biaxial loading, thus realizing the application of triaxial stress loading to rock specimens, as shown in Fig. 2a. Based on this, a new triaxial loading . Theoretical and experimental bifurcation analysis of rock under plane strain compression. Kang Qinrong Z. Weizhong Huang Gun Zhang Dianji. Geology, Engineering. . The spontaneous shear band formation in the biaxial test on dry sand samples with constant cell pressure is treated as a bifurcation problem.
Key words: lunar soil, distinct element method, Van der Waals forces, rolling resistance, biaxial compression test, shear band. CLC Number: TU 431 Cite this article. JIANG Ming-jing , ZHENG Min , WANG Chuang . . Force chain evolution in granular materials during biaxial compression [J]. Rock and Soil Mechanics, 2019, 40(6): 2427-2434. [3] LI . Additional calculations were performed to further investigate the cause of shear bands. The outcome indicated that the formation of shear bands results from a low shear stiffness compared to the in-plane compressive stiffness and instabilities under in-plane compression [24]. High in-plane compressive stresses were relieved by changing from in .STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1. INTRODUCTION 2. TESTING OF INTACT ROCK FOR STRENGTH 2.1 Uniaxial Compression 2.2 Point Load Testing 2.3 Uniaxial Tension 2.4 Indirect Tension Tests 2.5 Shear Tests 2.6 Confined Compression Tests (Triaxial Tests) 2.7 Biaxial and Multiaxial Tests 2.8 Other Tests 3. PARAMETERS . Shear band formation in planar deformation of soil samples is studied theoretically to explain the experimental finding that orientation angles depend on particle sizes. A review of such data shows that steep Coulomb-type shear bands occur in fine sands, whereas less inclined Roscoe-type shear bands are observed for coarse material. A bifurcation analysis for .
exhibited marginal variation as the rotation angle increased under biaxial compression. The predominant failure mode was a tension-shear failure, primarily governed by tensile cracks. The biaxial strength of the specimens exhibited a decreasing trend with the increase of horizontal rotation angle α. Conversely, the biaxial strength initially . Details of stereo camera setup, calibration and procedures of 3D-DIC for the dynamic shear test are same as the that performed for rock under dynamic biaxial compression. 50 Prior to the test, it is necessary to uniformly apply white-flat spraying paint to rock specimens, creating a well-speckled surface with a range of speckle sizes. The . This paper presents a set of uniaxial and biaxial compression tests on the rock-like material specimens with different fracture geometries through a rock mechanics servo-controlled testing system . The self-developed servo biaxial testing machine was used in the experiment, and independent loading systems were set in the x and z directions. The maximum vertical static load is 4500 kN and the maximum horizontal static load is 2500 kN, which can simulate the bidirectional compression of rocks near the excavation boundary with different aspect ratios.
A series of true triaxial tests have been performed on rectangular prismatic specimens of Santa Monica Beach sand at three different relative densities to study the occurrence of failure, mechanisms that create failure, and soil behavior in the vicinity . The effect of L-shaped notches (nonpersistent cracks) on the behavior of distance between two pre-existing cracks, bridge area in rock-like specimens, has been investigated both experimentally and numerically in this study. In the first step, the Brazilian and biaxial tests were conducted and based on the experimental results, similar numerical models were calibrated, .
To carry out the combined compression–shear loading test of rock, which is similar to the loading path of rock mass engineering in the laboratory, is the premise of understanding the deformation .
The columnar jointed rock mass (CJRM) has irregular structures, which significantly influence its mechanical properties and failure characteristics. Previously, it is difficult to produce CJRM specimens with the same structure for multiple repeated tests. Thus, in this study, the 3D printed (3DP) block models of CJRM with different inclination angles were .The spontaneous shear band formation in the biaxial test on dry sand samples with constant cell pressure is treated as a bifurcation problem. The constitutive response of sand is described in terms of mobilized friction and dilatancy. Dilatancy is looked upon as an internal constraint and the hardening rule is expressed in terms of an adequate dimensionless stress measure. Owing to .
Shear Bands in Biaxial Tests on Dry Coarse Sand
In the previous companion paper, a recently proposed meso-mechanical model using fracture-based zero-thickness interfaces was used to analyze 2D concrete specimens subject to uniaxial tension, to compare and discuss the results with respect to well-known experimental behavior, and to study the influence of composition and parameters on the .
Shear Banding in Sandstone: Physical and Numerical Studies
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biaxial test rock compression shear band|Shear Band Formation in Biaxial Compression Test