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| Experimental study on mechanical properties of layered slab-crack composite structure rock mass |
| LU Haifeng1，2，WEI Aichao1，ZOU Xingchen1 |
| (1. School of Civil Engineering，Wuhan University，Wuhan，Hubei 430072，China；2. Key Laboratory of Geotechnical and Structural Safety Engineering of Hubei Province，Wuhan University，Wuhan，Hubei 430072，China) |
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Abstract The layered structure is a common type of rock mass structure in nature，which is widely distributed in China. However，under the action of tectonic stress in the west，it is easy to form a special rock mass combination structure，namely，a layered slab-rent structure. In this paper，the mechanical properties of slate with layered slab-rent structures in the western region are studied. The results show that the internal structure of slate rock has a great influence on the failure mode and mechanical properties of rock，and the anisotropy is obvious. In order to eliminate the interference of the rock structural plane，the mechanical properties of the layered slab-rent structure are studied by using the prefabricated interlayer thin interlayer of granite with high integrity and good homogeneity. The research results show that the peak strength and elastic modulus of rock mass decrease linearly with the increase of interlayer plate-cracking structural plane density. The larger the interlayer plate-cracking structural plane density is，the smaller the strain energy absorbed by the rock mass in the compression deformation process is，and the degree of damage is also weakened. When the failure occurs，cracks first appear at the plate-cracking structural plane，and then the cracks expand and penetrate into the failure. On this basis，the density parameter of the structural plane is introduced to optimize the deformation constitutive equations of the existing elastic homogeneous discontinuous structure and fractured structure rock mass. The optimized constitutive equation can better describe the constitutive relationship of the layered slab-rent composite structure rock mass.
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2022, Vol. 41 
