| Based on the complex geological conditions of a copper-zinc mine site,this paper uses a combination of laboratory tests and numerical simulations from the macro and meso perspectives to study the mechanical properties and meso failure of rock with structural planes under shear.The mechanism is studied in order to provide the necessary basic basis for the survey,design and construction of rock engineering construction with structural planes.The main research contents are as follows:(1)Making specific molds,based on field survey geological material data,cast into test specimens containing different structural plane inclination angles and different material strengths,and perform shear tests.The shear stress-shear deformation curve,normal displacement-shear The analysis of shear displacement curve and acoustic emission data has studied the effects of normal stress,structural surface inclination and other factors on rock mass mechanical characteristics,acoustic emission characteristics and crack propagation mode.(2)Based on laboratory tests,PFC 2D is used to analyze the rock mass numerically.After the model is established,the meso-parameters corresponding to the physical test are given to match the numerical simulation and the physical test’s failure mode and strength curve,which verifies the feasibility of the PFC 2D model for rock mass simulation.(3)Using the model established by PFC 2D,the microscopic mechanism of normal stress on crack propagation and the effect of forward and reverse shear on macroscopic damage characteristics were studied.The test results show that the crack propagation mechanism is different with different normal stress;The rock mass has strong shear directionality,and the morphological characteristics of forward and reverse shear failure under the same conditions are different. |
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