Latest explanation of rock mass strength parameters and its application

Aiming at more complex geologic parameter of Hoek-Brown strength criterion,it was proposed to substitute by Mohr-Coulomb strength criterion parameter. Based on the 2002 version of Hoek-Brown strength criterion, and combining with the rock mass strength criteria,a new conversion relational expression between the rock mechanics parameters and parameters of Hoek-Brown strength was established. Through example analysis,under the condition of known rock mass strength parameters,the obtained Hoek-Brown strength parameters by the conversion relational expression were within its scope. According to single factor analysis method,it showed that the geological parameters m b,s decrease with the increase of cohesion,and increase with the increase of internal friction angle, and the influence on geological parameter α by the cohesion and internal friction angle is smaller. The new method was used to calculate the radius of plastic zone in surrounding rock of roadway. It showed that the rock mechanics parameter has a certain influence on geological parameters,and the radius of plastic zone obtained by the new method can provide theoretical basis for quantitative design.