Study on strength calculation and quality grading of slope rock in Fushun West Open Pit Mine

SUN Guangming; HU Gaojian; XIAO Ping; WANG Xuefeng

doi:10.13199/j.cnki.cst.2017.12.007

Abstract：Based on the rock mechanics strength parameters were the important factors affected to the rock quality index,the rock quality grading could directly reflect the stability of the rock condition,in order to study the self-stability ability of the slope rock in the West Open Pit Mine,a site structural surface photogrammetry technology was applied to get the information on the parameters of the rock structural surface and the point load test and the generalized Hoek-Brown strength criterion were applied to study the mechanics strength parameters of the slope rock and rock mass.In combination with the quality grading theory of the rock mass,the rock mass quality grading of the slope in different region was studied.The study showed that the compressive strength of the slope rock in West Open Pit Mine was 88.93 ～ 119.86 MPa and the strength was high.The compressive strength of the whole rock was 2.874 ～ 3.710 MPa,the cohesion force was 0.788 ～ 0.894 MPa,the internal friction angle was 49.18°～ 51.01°,the quality of the rock mass was good,the rock mass was a Grade Ⅲ rock mass and the stability was stable.The compressive strength of the rock mass in No.3 measuring point region was low locally,was only 0.555 MPa,the cohesion force was 0.438 MPa,the internal friction angle was 39.46°,was a Grade Ⅳ rock mass and the self stability capacity of the rock mass was poor.