Stability Analysis and Treatment Measure of the Mining Stope Slope

Abstract

Abstract-This Based on the stope in HeBei province, the sliding failure mode and treatment measure after the excavation of the stope is discussed. The RMR methods and the GS I methods are both used to estimate the mechanical parameters of the rock mass, and the smaller parameters are selected for the stability calculation. The numerical simulation of the slope excavation by finite element is carried out, and the development of the displacement and plastic zone during the excavation are analyzed. Furthermore, the stability analysis of the excavated slope is carried out, and the results showed the safety factors cannot meet the standard requirement. Then the bolt support are used to reinforce the excavated slope, and the calculation results show that the safety factors of the reinforced slope can meet the requirement of the relative standards.Keywords-mine stope; stability of the slope; plastic zone; bolt support I. INTRODUCTION Stability analysis of rock slope is a systematic engineering, including influence factors of slope instability, stability prediction, the value of shear strength parameters of rock, stability analysis and prevention measures, et al [1][2][3][4][5] . The individual qualitative analysis or quantitative analysis cannot completely reflect slope status. This paper takes the actual project as an example, carried out preliminary study fro m field measurement about main influencing factors of instability, qualitative judgement of instability, laboratory test and the occurrence of structural plane, the value of shear strength parameters of rock and finite element analysis, in detail introduced the process of stability analysis, using energy method for stability analysis of slope that divided sliding soil into multiple-b lock mode, then based on Mohr-Coulomb failure criterion and associated flow rule, structure a coordinated displacement field, and according to principle of virtual work, obtained upper limit of slope safety factor, and gave governance suggestions.