Asymmetric Deformation Mechanism In Deep And High Stress Soft Rock Roadway And The Control Countermeasure

The produce destruction for deep high stress of surrounding rock by tilt the asymmetry of stress around, the widespread use of the roadway along the whole section, the strong support form; When the periphery of roadway to certain parts produced great stress concentration, the conventional supporting structure can't meet the requirements, lead to the periphery of roadway local asymmetry of the existence of high pressure and appear support failure. In this situation, if increase the whole section support strength, to the periphery of roadway individual high stress position supporting intensity of surrounding rock mass deformation and control, and to the periphery of roadway surrounding rock stress smaller position, use high strength support there is serious waste materials, increase support costs, cause unnecessary waste.In order to master the tilt of the deep strata asymmetric deformation and failure mechanism, the choice of the typical high stress soft rock tunnel project example, the finite difference FLAC3D program construction engineering geological model, according to the site of the surrounding rock mechanics performance parameters, surrounding rock stress test results, the original of support to the original parameters, such as supporting conditions of surrounding rock mass deformation and failure process for numerical calculation and analysis of the results. According to the numerical calculation results, combined with the engineering geological conditions, the surrounding rock structure, physical and chemical composition and surrounding rock stress analysis, it is concluded that cause deep tilt of rock deformation and failure of the asymmetric produce the mechanism and expression.According to the asymmetric deformation and failure mechanism analysis, this paper discusses the asymmetric coupling support put forward countermeasures. With anchor note, encryption anchor, points of anchors, such as technology to produce means of deformation and failure of the difference of the key parts of the intensive support, make the non-coupling states deformation coordination between. With theoretical research, to select the suitable engineering project, the specific engineering and formulate a detailed feasible asymmetric deformation coupling support parameters control and field test. Through to the wallrock deformation monitoring, verified the feasibility of symmetric coupled supporting measures. Basically eliminate the surrounding rock key parts of the deformation produced differences, and to reduce the cost of support, but also for the future of the deformation of the asymmetry of the work provides the reference.