Study On Instability Characteristics And Supporting Method Of Surrounding Rock In Excavation Excavation

Taking Huize Lead-Zinc Mine of 8# ore-body of 1300m level stage as the research background, the paper mainly by means of numerical simulation and mechanical analysis, from the mine engineering geological condition, analyzes the main factors influencing instability of surrounding rock of roadway in mining districts. Combining mining rock physical and mechanical parameters, establish model of roadway midway through 1300, and introduces stress criterion of rock burst in the numerical analysis, respectively from the changes of stress redistribution and displacement caused by engineering excavation and acoustic emission reveals the stress evolution mode and instability mechanism of roadway surrounding rock mass, and for the future work of rockburst in mining the prevention and control has a certain reference and reference. The main research content is as follows:(1)Under high geostress were explored. The main research content is as follows:The stabilit y of deep tectonic stress field tunnel surrounding rock was analyzed by the software FLAC3D numerical simulation. The influence of deep tectonic stress field in the role of horizontal stress a nd vertical stress for the stability of the surrounding rock has been verified, the basic rule of tunn el surrounding rock instability has been obtained.(2) According to the monitoring of displacement, stress value and its development and change of plastic zone, reveal the maximum deformation of roadway and its regional location, based on the analysis of stress criterion for rock burst prediction, high stress is studied under the condition of deep roadway excavation induced instability of surrounding rock and rock burst mechanism;(3) Using rock failure process analysis software RFPA2Dmaterial research under the static load of deep roadway surrounding rock rupture process, from the perspective of mesoscopic mechanics analysis, exploration under the condition of tectonic stress field of rock damage the whole process of crack initiation and extension, and even well versed in, intuitive image expression of excavation and unloading process induces instability of surrounding rock.(4) According to FLAC3D and RFPA2D law resulting simulation of roadway support. Calculating the correlation parameters support the use of loose circle theory and engineering analogy method, designed three kinds of support programs and the use of three-dimensional finite difference software FLAC3D the actual situation is simulated by numerical simulation of non-support and three kinds of support programs Results Comparative analysis of the stability and support methods HUIZE deep roadway were compared and analyzed to choose the best support programs to ensure long-term stability of the roadway.In this paper, FLAC3D and RFPA2D software are used to track and analyze the Deep High Stress Roadway excavation process of stress redistribution and the process of demonstrating the instability induced by rock burst roadway, preferably support a reasonable way for rock burst mechanism and mine rock burst control to provide evidence.