The Coal Mine 31202 Working Face Of Rockburst Mechanism And Scour Prevention Technology Research

The rock burst is one of the mine disasters that presents the most significant casualties and economic losses,And with the increasing depth of mining,it has become one major hidden danger in mine production.Rock burst,with complex occurrence mechanism,multiple influence factors and hard management,is the main dynamic catastrophe of coal mine.The problem of effective prediction and scientific prevention has not been solved so far.This paper,taking the specific geological conditions of the 31202 working face of the Hu Xi mine as the background,adopts the method of combining with indoor test,theoretical calculation and numerical simulation and studies the movement of overlying strata and the evolution of mining stress in the 31202 working face of the Huxi Mine.Next,the mechanism of the occurrence of rock burst was derived,and based on this,a corresponding monitoring and treatment plan was formulated.The mechanical properties of the roof rock in the 31202 working face,especially the main physical and mechanical properties of the rock mass including compressive and tensile strength,were tested.Then,the difference between the "load three belt" and the "traditional three generation" and the temporal and spatial evolution rules of the“load three belt" in different excavation stages are studied,and the theoretical calculation of the "three zones of load"is derived.This paper deduces the theoretical calculation formula of the thickness and stress variation of three zones of load,and obtains the influence range of the delayed loading belt and the timely loading belt on the leading bearing pressure of the working face.The FLAC 3D numerical simulation software was used to simulate the distribution characteristics of advance bearing pressure at different stages of the working face,and the simulated data was compared with the calculated results of the three zones of load.Based on the above research results,the classical strength theory was used to obtain the mechanism of rock burst in the 31202 working face,and then a reasonable mine pressure monitoring program and a rock pressure control program were developed.The research results of this paper integrate the mechanism of rock burst occurrence,monitoring and prevention,and have certain reference value for the control of the rock burst under the working conditions of similar geological conditions.