Sensitivity analysis of conventional triaxial test simulation parameters for structural coal
Dynamic accidents such as coal and gas outburst and roof fall occur continuously,which seriously threaten coal mine safety production.Therefore,it is very important to reveal the evolution mechanism of mechanical damage of coal and rock behind dynamic dis-asters.A particle flow model based on structural coal body was constructed by using discrete element software PFC3D.By changing the contact modulus,stiffness ratio,bond strength ratio,friction angle and friction factor parameters of the model,the sensitivity of conven-tional triaxial simulation parameters of the model was analyzed.The results showed that the influence of the contact modulus on the me-chanical properties of the structural coal model was mainly reflected in the deformation properties of the model.The change of stiffness ratio had influence on the strength and deformation characteristics of the structural coal model.The bond strength ratio had influence on the maximum compressive strength and peak strain of the structural coal model.The internal friction angle had influence on the damage pattern of the model.The influence of friction factor on structural coal model was reflected in the strength and peak strain of the model.Then the process of parameter calibration was guided,and the simulation results were in good agreement with the experimental results.This lays a foundation for the subsequent research on the mechanism of coal and rock dynamic disaster.
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