Study On Stability Of Surrounding Rock Of High Stress Soft Rock Roadway Of Deep Mine

On a national energy consumption increases unceasingly, led directly to the coal mining enterprises, but also strengthened led to increased coal mining depth, leaving some coal mining depth has more than kilometers. Deep roadway increase in stress level appeared in the roadway and mine pressure is serious and violent, surrounding rock deformation shows soft rock surrounding rock deformation characteristics, roadway support became more and more difficult. The traditional roadway support structure and support parameters already can not adapt to the deep mine high stress deformation law of soft rock roadway, and the existing deep roadway control countermeasures immature, this makes the stability of surrounding rock roadway without effective control and roadway constantly repair even abandoned, caused a huge economic losses. How to effectively control high stress soft rock roadway surrounding rock deformation in deep mine, has become urgent problems.This paper adopts site measurement, theoretical analysis, orthogonal experiment and numerical simulation methods to analyze surrounding rock deformation law and mechanics characteristic of high stress soft rock roadway of deep mine. By field measurement analysis, displacement of surrounding rock roadway surface grows exponentially, the roof and floor of is the key of controlling roadway surrounding rock, loose circle is 2.5-3m. Mechanics characteristic of high stress soft rock roadway of deep mine is studyed for using elastic-plastic mechanics theory, and any point deformation rate formula displacement and deformation. Using Flac3D numerical simulation soft establish strain softening of Flac3D numerical simulation model, strain softening model roadway excavation stress field and displacement field and plastic damage area were analyzed to determine high stress, deep soft rock tunnel deformation damage characteristics of surrounding rock. According to the failure characteristics forward roadway bolt anchor nets cable firm soft coupling and surrounding rock bottom overall reinforcement+blot-inject support technology, using the orthogonal experiment, Flac3D numerical simulation and theory analysis, determines a reasonable deep soft rock tunnel to supporting institutions and support parameters. According to the roadway structure and obtained the field test supporting parameters, the experimental results show that-850 to optimize the gangue dark portal of supporting structure and support parameters, can effectively control the drift surrounding rock deformation, guarantee the stability of surrounding rock, will surrounding rock deformation effectively control in reasonable limits, in similar geological conditions for high stress deep soft rock tunnel support, provides important reference value.