Research Of Deformation And Failure Rule And Long Term Stability Of Surrounding Rock Of High Stress Hard Rock Roadway In Deep Mine

According to China's energy strategy action plan and related research,in the future for a long period of time, China will continue to be coal-based energy structure. In China has proven coal resources, about 2.95×1012t buried depth below 1000m, accounting for 53% of China's total coal resources. In deep underground engineering, creep is one of the important reasons for the instability of surrounding rock in coal and rock engineering. In recent years, more and more hard rock roadway with high buried depth and high stress has occurred due to creep Destroy the event. Therefore, it is very important and urgent to study the creep characteristics and long-term stability of the surrounding rock in deep well high stress hard rock roadway.In this paper, combined with the geological conditions of Yuncheng coal mine, the theoretical analysis, numerical simulation and on-the-spot monitoring are used, The deformation law, mechanical properties, deformation failure mechanism and long - term stability control method of surrounding rock in deep well high stress hard rock roadway are analyzed and studied.Through the field measurement, the displacement of the surrounding rock of the roadway is exponentially increasing, and the roof and the two gangs are the focus of the stability control of the surrounding rock. The viscoelasticity theory is used to analyze the mechanics characteristics of the surrounding rock of the high stress hard rock roadway, and the deformation displacement and deformation rate formula of the surrounding rock are obtained. The numerical simulation software was used to analyze the stress field, displacement field and plastic failure zone after excavation of the roadway to determine the deformation and failure characteristics of the surrounding rock of the high stress hard rock roadway.The factors that affect the stability of surrounding rock in deep well high stress hard rock roadway are summarized as natural factors and man-made controllable factors, Human controllable factors which include: supporting manner, parameters like supporting material.Supporting the parameters comprising: bolting (cable) length, diameter,inter-row spacing, and so preload?The orthogonal test method was used to screen the matching between the levels of support parameters. Then,the scheme was simulated by Flac3D numerical simulation software.Select the top and bottom plate near the amount of ?X and two shift close to the amount of AY for the evaluation of different programs support the effect of indicators, analysis of simulation results, from which to select the best support program. Using optimum parameters anchor net support through simulation analysis and site obtained in practice Yuncheng colliery a roadway mining area, test results show that the optimum parameters of the support can effectively control the optimized tunnel in hard rock in deep Deformation and destruction of surrounding rock under high ground stress. Which meets the requirement of effectively controlling the service life of surrounding rock and roadway, and provides important reference value for the support of deep well high stress hard roadway under similar geological conditions.