含褶皱巷道围岩破裂碎胀大变形机理FDEM数值模拟研究

doi:10.19286/j.cnki.cci.2023.08.004

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Abstract The folded structures are frequently encountered in roadway excavation; therefore, the combined finite-discrete element numerical method (FDEM) was used in paper to study buckling failure mechanism of surrounding rock masses containing folded structures. Firstly, the FDEM shear stress constitutive model at post-peak softening stage was improved, in which the residual shear stress could be maintained under compression-shear state. Then, numerical models of folded structures with different shapes were established by using consie function y=acos(x). Finally, the improved FDEM numerical method was used to study the failure and large deformation mechanism of isotropic and anisotropic rock mass with different in situ stress lateral coefficients λ (λ=0.5 and 2.0) and folded structure shapes (a=0, 0.5 m and 1.5 m). The study results indicated that for the isotropic rock mass, the influence of folded structures shape was weak, that was, the rock mass was fracture by X-shaped conjugated shear cracks following by few tension cracks. The large deformation was induced by the buckling failure of rock mass and the movement of the rock fragments..

Key words： folded structures weak surrounding rock mass in roadway fdem buckling failure in situ stress lateral coefficient

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Jia Yongjie. FDEM numerical simulation on buckling failure mechanism of surrounding rock masses containing folded structures[J]. CCI, 2023, 46(8): 15-19.

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http://www.mtyhg.com.cn/EN/10.19286/j.cnki.cci.2023.08.004 OR http://www.mtyhg.com.cn/EN/Y2023/V46/I8/15

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