The Experts below are selected from a list of 3141 Experts worldwide ranked by ideXlab platform
Jian Liu - One of the best experts on this subject based on the ideXlab platform.
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experimental and numerical investigations on mechanical property and reinforcement effect of bolted Jointed Rock Mass
Construction and Building Materials, 2016Co-Authors: Hao Zhou, Weishen Zhu, Lei Zhang, Jian LiuAbstract:Abstract The reinforcement for Jointed Rock Mass using Rock bolts has always been one of the most effective and economical geo-structural reinforcing technologies widely used in practical civil engineer projects for a long time. In the field of Rock Mass engineering, the reinforcement effect of the Rock bolt(s) on Rock Mass is much more obvious due to a large number of natural fractures in Rock Masses. In this paper, an optimized method using Discontinuous Deformation Analysis for Rock Failure (DDARF) is presented to perform numerical investigations on mechanical property and reinforcement effect of bolted Jointed Rock Mass. In order to verify the effectiveness of the proposed optimized DDARF, laboratory experiments using analog material have also been performed. Experimental results are very favorable with those obtained by the optimized DDARF. Moreover, this numerical method has also been employed to study mechanical property and reinforcement effect of Rock specimen with single joint and single Rock bolt when the joint and Rock bolt have different locations in the specimens. The optimal reinforced location for the Rock bolt in the specimen has been obtained through the comparative analysis of reinforcement effects under different conditions. The single Jointed Rock specimens with two Rock bolts have also been numerically simulated and the optimal reinforcing location for the Rock bolts has also been obtained. It is concluded that this optimized DDARF would provide an alternative effective tool to investigate the mechanical property and reinforcement effect for bolted Jointed Rock Mass.
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Experimental and numerical investigations on the shear behavior of a Jointed Rock Mass
Geosciences Journal, 2015Co-Authors: Hao Zhou, Weishen Zhu, Jian LiuAbstract:The original forming process of the earth crust is companied with internal in situ stress, which gradually complicates while the earth crust evolves with geological conformation movements, leading to the generation of large amounts of faults, joints and fissures. These structural planes, to some extent, remarkably reduce the strengths of Rock Mass, including the shear behavior. In this paper, the authors report a physical model test on Jointed Rock Mass under direct shear stress state and also adopt a numerical method, Discontinuous Deformation Analysis for Rock Failure (DDARF), to simulate the shear failure process, the variation of stresses and displacements of some key monitoring points. The comparative analysis demonstrates that the numerical results are favorable with those obtained in the physical model test. Therefore, it is concluded that the method of DDARF could effectively simulate the shear behavior of Jointed Rock Mass. Furthermore, other than the original physical model test, the numerical models with echelon joints under different axial loadings are also simulated. The crack initiation, extension, coalescence, and the ultimate shear failure are totally investigated, after which the shear behavior of numerical models in different cases are comparatively analyzed.
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Numerical Study on Crack Propagation in Brittle Jointed Rock Mass Influenced by Fracture Water Pressure
Materials, 2015Co-Authors: Hao Zhou, Weishen Zhu, Jian LiuAbstract:The initiation, propagation, coalescence and failure mode of brittle Jointed Rock Mass influenced by fissure water pressure have always been studied as a hot issue in the society of Rock mechanics and engineering. In order to analyze the damage evolution process of Jointed Rock Mass under fracture water pressure, a novel numerical model on the basis of secondary development in fast Lagrangian analysis of continua (FLAC3D) is proposed to simulate the fracture development of Jointed Rock Mass under fracture water pressure. To validate the feasibility of this numerical model, the failure process of a numerical specimen under uniaxial compression containing pre-existing fissures is simulated and compared with the results obtained from the lab experiments, and they are found to be in good agreement. Meanwhile, the propagation of cracks, variations of stress and strain, peak strength and crack initiation principles are further analyzed. It is concluded that the fissure water has a significant reducing effect on the strength and stability of the Jointed Rock Mass.
S G Chen - One of the best experts on this subject based on the ideXlab platform.
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Simulation of blast wave propagation in Jointed Rock Mass using UDEC
Journal of China University of Mining and Technology, 2002Co-Authors: J. Zhao, S G Chen, Jun Gang Cai, Hong Wei SongAbstract:The coupled method of UDEC and AUTOYN 2D was used to simulate the propagation of blast waves in a Jointed Rock Mass and the influence of joints on the propagation. The AUTODYN was used to simulate explosion process and blast waves to provide the explosion input to the UDEC modeling used to simulate the propagation of blast waves in a Jointed Rock Mass. The research shows that it is reasonable to use this coupling method to simulate the explosion process and the propagation of blast waves in a Jointed Rock Mass.
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Discrete element modelling of an underground explosion in a Jointed Rock Mass
Geotechnical & Geological Engineering, 2000Co-Authors: S G Chen, J. Zhao, Y.x. ZhouAbstract:The purpose of this paper is to investigate the application of the discrete element program UDEC for modelling underground explosions in a Jointed Rock Mass. A field underground explosion test has been conducted and UDEC and AUTODYN were utilised in a coupled manner to predict the Rock Mass response due to the underground explosion. The dynamic equation for the state of the Rock material obtained from impact tests was incorporated into the calibration modelling. The comparison of modelling results with test results and empirical formulas shows that UDEC is capable of modelling explosion wave propagation in Jointed Rock Mass with high reliability.
Weishen Zhu - One of the best experts on this subject based on the ideXlab platform.
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experimental and numerical investigations on mechanical property and reinforcement effect of bolted Jointed Rock Mass
Construction and Building Materials, 2016Co-Authors: Hao Zhou, Weishen Zhu, Lei Zhang, Jian LiuAbstract:Abstract The reinforcement for Jointed Rock Mass using Rock bolts has always been one of the most effective and economical geo-structural reinforcing technologies widely used in practical civil engineer projects for a long time. In the field of Rock Mass engineering, the reinforcement effect of the Rock bolt(s) on Rock Mass is much more obvious due to a large number of natural fractures in Rock Masses. In this paper, an optimized method using Discontinuous Deformation Analysis for Rock Failure (DDARF) is presented to perform numerical investigations on mechanical property and reinforcement effect of bolted Jointed Rock Mass. In order to verify the effectiveness of the proposed optimized DDARF, laboratory experiments using analog material have also been performed. Experimental results are very favorable with those obtained by the optimized DDARF. Moreover, this numerical method has also been employed to study mechanical property and reinforcement effect of Rock specimen with single joint and single Rock bolt when the joint and Rock bolt have different locations in the specimens. The optimal reinforced location for the Rock bolt in the specimen has been obtained through the comparative analysis of reinforcement effects under different conditions. The single Jointed Rock specimens with two Rock bolts have also been numerically simulated and the optimal reinforcing location for the Rock bolts has also been obtained. It is concluded that this optimized DDARF would provide an alternative effective tool to investigate the mechanical property and reinforcement effect for bolted Jointed Rock Mass.
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Experimental and numerical investigations on the shear behavior of a Jointed Rock Mass
Geosciences Journal, 2015Co-Authors: Hao Zhou, Weishen Zhu, Jian LiuAbstract:The original forming process of the earth crust is companied with internal in situ stress, which gradually complicates while the earth crust evolves with geological conformation movements, leading to the generation of large amounts of faults, joints and fissures. These structural planes, to some extent, remarkably reduce the strengths of Rock Mass, including the shear behavior. In this paper, the authors report a physical model test on Jointed Rock Mass under direct shear stress state and also adopt a numerical method, Discontinuous Deformation Analysis for Rock Failure (DDARF), to simulate the shear failure process, the variation of stresses and displacements of some key monitoring points. The comparative analysis demonstrates that the numerical results are favorable with those obtained in the physical model test. Therefore, it is concluded that the method of DDARF could effectively simulate the shear behavior of Jointed Rock Mass. Furthermore, other than the original physical model test, the numerical models with echelon joints under different axial loadings are also simulated. The crack initiation, extension, coalescence, and the ultimate shear failure are totally investigated, after which the shear behavior of numerical models in different cases are comparatively analyzed.
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Numerical Study on Crack Propagation in Brittle Jointed Rock Mass Influenced by Fracture Water Pressure
Materials, 2015Co-Authors: Hao Zhou, Weishen Zhu, Jian LiuAbstract:The initiation, propagation, coalescence and failure mode of brittle Jointed Rock Mass influenced by fissure water pressure have always been studied as a hot issue in the society of Rock mechanics and engineering. In order to analyze the damage evolution process of Jointed Rock Mass under fracture water pressure, a novel numerical model on the basis of secondary development in fast Lagrangian analysis of continua (FLAC3D) is proposed to simulate the fracture development of Jointed Rock Mass under fracture water pressure. To validate the feasibility of this numerical model, the failure process of a numerical specimen under uniaxial compression containing pre-existing fissures is simulated and compared with the results obtained from the lab experiments, and they are found to be in good agreement. Meanwhile, the propagation of cracks, variations of stress and strain, peak strength and crack initiation principles are further analyzed. It is concluded that the fissure water has a significant reducing effect on the strength and stability of the Jointed Rock Mass.
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DDARF Analysis on Shear Tests of Jointed Rock Mass
Applied Mechanics and Materials, 2013Co-Authors: Shuai Guo, Weishen Zhu, Chao JiaAbstract:Referring to the previous shearing model tests on intermittence Jointed Rock Mass, DDARF method was adopted to conduct the corresponding numerical simulation. It could be concluded from the cracking failure phenomena that the results of the numerical simulation and the tests were in good agreement. Then the intermittence joints were arranged as en echelon and different cracking failure phenomena, peak shear strengths and strain-stress relationships were also obtained.
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A Constitutive Model of Anchored Jointed Rock Mass and its Application
Advanced Materials Research, 2008Co-Authors: Wei Min Yang, Weishen Zhu, Ai Hua SunAbstract:The Jointed Rock Mass distributed in the nature widely and its mechanical characteristic influenced the stability of the Rock engineering badly. The cracks propagated and coalesced each other and macroscopic failure happened. Bolts were a kind of effective reinforcement instrument and they could prevent the cracks from propagating. However, the anchoring mechanism of bolts was not realized clearly and their reinforcement could not be reflected effectively in the numerical simulation yet. Based on the damage mechanics, a constitutive relation and damage equation of anchored Jointed Rock Mass were presented in this paper. With a project application, the model was proved to be feasible one.
J. Zhao - One of the best experts on this subject based on the ideXlab platform.
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Simulation of blast wave propagation in Jointed Rock Mass using UDEC
Journal of China University of Mining and Technology, 2002Co-Authors: J. Zhao, S G Chen, Jun Gang Cai, Hong Wei SongAbstract:The coupled method of UDEC and AUTOYN 2D was used to simulate the propagation of blast waves in a Jointed Rock Mass and the influence of joints on the propagation. The AUTODYN was used to simulate explosion process and blast waves to provide the explosion input to the UDEC modeling used to simulate the propagation of blast waves in a Jointed Rock Mass. The research shows that it is reasonable to use this coupling method to simulate the explosion process and the propagation of blast waves in a Jointed Rock Mass.
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Discrete element modelling of an underground explosion in a Jointed Rock Mass
Geotechnical & Geological Engineering, 2000Co-Authors: S G Chen, J. Zhao, Y.x. ZhouAbstract:The purpose of this paper is to investigate the application of the discrete element program UDEC for modelling underground explosions in a Jointed Rock Mass. A field underground explosion test has been conducted and UDEC and AUTODYN were utilised in a coupled manner to predict the Rock Mass response due to the underground explosion. The dynamic equation for the state of the Rock material obtained from impact tests was incorporated into the calibration modelling. The comparison of modelling results with test results and empirical formulas shows that UDEC is capable of modelling explosion wave propagation in Jointed Rock Mass with high reliability.
Hao Zhou - One of the best experts on this subject based on the ideXlab platform.
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experimental and numerical investigations on mechanical property and reinforcement effect of bolted Jointed Rock Mass
Construction and Building Materials, 2016Co-Authors: Hao Zhou, Weishen Zhu, Lei Zhang, Jian LiuAbstract:Abstract The reinforcement for Jointed Rock Mass using Rock bolts has always been one of the most effective and economical geo-structural reinforcing technologies widely used in practical civil engineer projects for a long time. In the field of Rock Mass engineering, the reinforcement effect of the Rock bolt(s) on Rock Mass is much more obvious due to a large number of natural fractures in Rock Masses. In this paper, an optimized method using Discontinuous Deformation Analysis for Rock Failure (DDARF) is presented to perform numerical investigations on mechanical property and reinforcement effect of bolted Jointed Rock Mass. In order to verify the effectiveness of the proposed optimized DDARF, laboratory experiments using analog material have also been performed. Experimental results are very favorable with those obtained by the optimized DDARF. Moreover, this numerical method has also been employed to study mechanical property and reinforcement effect of Rock specimen with single joint and single Rock bolt when the joint and Rock bolt have different locations in the specimens. The optimal reinforced location for the Rock bolt in the specimen has been obtained through the comparative analysis of reinforcement effects under different conditions. The single Jointed Rock specimens with two Rock bolts have also been numerically simulated and the optimal reinforcing location for the Rock bolts has also been obtained. It is concluded that this optimized DDARF would provide an alternative effective tool to investigate the mechanical property and reinforcement effect for bolted Jointed Rock Mass.
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Experimental and numerical investigations on the shear behavior of a Jointed Rock Mass
Geosciences Journal, 2015Co-Authors: Hao Zhou, Weishen Zhu, Jian LiuAbstract:The original forming process of the earth crust is companied with internal in situ stress, which gradually complicates while the earth crust evolves with geological conformation movements, leading to the generation of large amounts of faults, joints and fissures. These structural planes, to some extent, remarkably reduce the strengths of Rock Mass, including the shear behavior. In this paper, the authors report a physical model test on Jointed Rock Mass under direct shear stress state and also adopt a numerical method, Discontinuous Deformation Analysis for Rock Failure (DDARF), to simulate the shear failure process, the variation of stresses and displacements of some key monitoring points. The comparative analysis demonstrates that the numerical results are favorable with those obtained in the physical model test. Therefore, it is concluded that the method of DDARF could effectively simulate the shear behavior of Jointed Rock Mass. Furthermore, other than the original physical model test, the numerical models with echelon joints under different axial loadings are also simulated. The crack initiation, extension, coalescence, and the ultimate shear failure are totally investigated, after which the shear behavior of numerical models in different cases are comparatively analyzed.
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Numerical Study on Crack Propagation in Brittle Jointed Rock Mass Influenced by Fracture Water Pressure
Materials, 2015Co-Authors: Hao Zhou, Weishen Zhu, Jian LiuAbstract:The initiation, propagation, coalescence and failure mode of brittle Jointed Rock Mass influenced by fissure water pressure have always been studied as a hot issue in the society of Rock mechanics and engineering. In order to analyze the damage evolution process of Jointed Rock Mass under fracture water pressure, a novel numerical model on the basis of secondary development in fast Lagrangian analysis of continua (FLAC3D) is proposed to simulate the fracture development of Jointed Rock Mass under fracture water pressure. To validate the feasibility of this numerical model, the failure process of a numerical specimen under uniaxial compression containing pre-existing fissures is simulated and compared with the results obtained from the lab experiments, and they are found to be in good agreement. Meanwhile, the propagation of cracks, variations of stress and strain, peak strength and crack initiation principles are further analyzed. It is concluded that the fissure water has a significant reducing effect on the strength and stability of the Jointed Rock Mass.
