Study on the equivalent mechanical parameter model of fractured rock mass based on the numerical test of particle flow code

Abstract

In order to obtain accurately the equivalent mechanical parameter model of jointed rock mass, in this paper, the numerical test of particle flow code and Hoek-brown criterion are used to analyse the mechanical parameters of rock mass. First, based on rock sample indoor test, the PFC software is used to check rock block parameters and obtain rock block micromechanics parameters, and the joint elements are added for uniaxial compression and biaxial compression numerical experiments to obtain the mechanical strength parameters of rock mass. Then, these parameters obtained by numerical test are compared with those obtained by Hoek-Brown criterion to comprehensively determine mechanical parameters of rock mass. Finally, the equivalent mechanical parameter model of rock mass is established, and the microscopic parameters of it are obtained by checking the parameters. The research results have certain theoretical significance for joint rock mass modelling.