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Failure mode and strength anisotropic characteristic of stratified rock mass under uniaxial compressive situation

Journal of Central South University 2009年第4期16卷 663-668页

作者：鲁光银朱自强柳群义何现启 School of Info-physics Engineering Central South University

A stratified rock mass model was founded by FLAC^3D. The failure mode and anisotropic characteristic of strength for stratified rock mass were analyzed. The analysis results show that the numerical simulation can visually reflect the failure modes of rock samples under different inclination angles β of structural plane. The stiffness of rock sample before peak strength changes in the compressive procedure. With the increase of β, the compressive strength σc of rock sample decreases firstly and then increases; when β is in the range of 20°-30° and 80°-90°, σc has the largest sensitivity to r; while β falls in the range of 30°-70°, σc varies little. When φj〈β〈90° （ φj is friction angle of structure plane）, the results obtained from numerical simulation and theoretical analysis are in almost the same values; while β〈 φj or β=90°, they are in great different values. The results obtained from theoretical analysis are obvious larger than those from numerical simulation; and the results from numerical simulation can reflect the difference of compressive strength of rock samples for the two situations of β≥φj and β=90°, which is in more accordance with the real situation.

关键词： stratified rock mass failure mode strength anisotropic characteristic numerical analysis

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Fracture mechanism of inversed trapezoidal shaped tunnel excavated in 45° inclined rock strata

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International Journal of Mining Science and Technology 2015年第4期25卷 531-535页

作者： He Manchao Peng Yanyan Zhao Shuaiyang Shi Haiyang Wang Ning Gong Weili School of Mechanics and Civil Engineering China University of Mining & Technology State Key Laboratory for Geomechanics & Deep Underground Engineering College of Geoscience and Surveying Engineering China University of Mining & Technology

In order to understand failure mechanisms of the tunnel excavated in the stratified rock masses in deep mine, the physical modeling experiment by using the large-scale model was carried out. The field case simulated in the experiment is a main connection tunnel located at depth of 1000 m in Qishan coal mine,Xuzhou mining district. Tunnel deformation was monitored by using strain gauges and a video camera simultaneously. Crack initiation and propagation process during the test were analyzed based on image analysis of the captured video photographs. At the same time, deformation process of the key monitoring points around the tunnel section is given by the monitored strain plots. Under the increasing external loads, crack initiation occurs firstly on the left wall of the tunnel, then on the immediate *** failure of the tunnel occurs as a result of the slippage of the rock layers along the interfaces.

关键词： stratified rock mass Inclination Crack propagation Strain analysis Physical modeling

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维普期刊数据库

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Physical modeling of failure process of the excavation in horizontal strata based on IR thermography

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Mining Science and Technology 2009年第6期19卷 689-698页

作者： HE Man-chao GONG Wei-li LI De-jian ZHAI Hui-ming State Key Laboratory for Geomechanics and Deep Underground Engineering Beijing 100083 China School of Mechanics and Civil Engineering China University of Mining ＆ Technology Beijing 100083 China

In order to capture the mechanism of roadway instability in deep mines, a new approach of Physically Finite Elemental Slab Assemblage (PFESA) is proposed in order to construct a large-scale physical model simulating the geologically horizontal strata. We carried out physical modeling on the deformation and failure processes of roadways subjected to a plane loading scheme. Our laboratory tests were based on work which incorporated infrared (IR) detection, IR radiation temperature (IRT) statistics, image feature extraction and 2D Fourier transformation, from resulting thermographies. The IRT characterizes the mechanical responses from the roadway after loading with two stages, i.e., IRT evolving at higher levels corresponded to shallow mining (≤500 m) during which the roadway deformed gradually (referred to as the "steady deformation stage"); IRT evolving in a quasi-cyclical manner with multiple peaks corresponded to deep mining (800–2600 m), in which the failure mode for the roadway are dominated by breakage and collapse (called the "unsteady deformation stage"). The IR images and 2D Fourier spectra illustrate detailed information in terms of initiation, nucleation and coalescence of the damage to rock masses and the eventual failure of roadways subject to external loading.

关键词： roadway stratified rock mass deep mining physical modeling IR thermography

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