Failure mode and strength anisotropic characteristic of stratified rock mass under uniaxial compressive situation |
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Authors: | Guang-yin Lu Zi-qiang Zhu Qun-yi Liu and Xian-qi He |
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Affiliation: | (1) School of Info-physics Engineering, Central South University, Changsha, 410083, China |
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Abstract: | A stratified rock mass model was founded by FLAC3D. 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 σ
c of rock sample decreases firstly and then increases; when β is in the range of 20°–30° and 80°–90°, σ
c has the largest sensitivity to β; while β falls in the range of 30°–70°, σ
c varies little. When ϕ
j
<β<90° (β
j
is friction angle of structure plane), the results obtained from numerical simulation and theoretical analysis are in almost
the same values; while β⩽ ϕ
j
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⩾ ϕ
j
and β=90°, which is in more accordance with the real situation.
Foundation item: Project (50099620) supported by the National Natural Science Foundation of China |
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Keywords: | stratified rock mass failure mode strength anisotropic characteristic numerical analysis |
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