Study On The Support Law Of The Right-Angle Trapezoidal Plate Breakage And Stress Propagation To The Floor

There are many problems in the mining of deep coal seam in many mining areas in China, which is difficult to control the stability of the bottom roadway. Especially, it is difficult to control the surrounding rock of the roadway affected by the roadway. The influence of the mining of the bottom seam roadway is actually one of the important reasons for the roadway damage caused by the alternation of the dynamic and static pressure in the mining process, which causes the roadway maintenance difficult and the coal mine safety production. In this paper, 10304 mining face inclined longwall mining is used as the engineering background,and the breaking mechanism and propagation law of the critical layer of the large angle angle trapezium stope are studied by means of indoor test,theoretical analysis and numerical simulation. The law of the surrounding rock pressure distribution and the propagation principle of the roadway affected by the mining, and realize the reasonable classification of the roadway.The main research contents and conclusions are as follows: The key plate mechanics model of the right angle trapezoidal thin plate under inclined condition is established by using the elastic thin plate theory.The bending of the key layer of the double - The stress distribution of the sloping trapezoidal key surface is analyzed by using the PFC numerical simulation study, and the stress distribution of the sloping face Regularity and cross - exploitation of bottom slab. The results show that the stress of the bottom plate is concentrated near the middle of the mining face, and the fracture of the bottom plate in the high stress zone is more developed. Based on the distance between the bottom plate and the coal seam, the mechanical model is used to analyze the size and propagation law of the floor stress under different horizon conditions.The PFC simulation software is used to monitor and analyze the stress state above the roadway and provide a reasonable support scheme.Based on the stress evolution law of the oblique right angle trapezoid and the influence of the advance support pressure, the dynamic distribution of the load on the coal wall is analyzed and analyzed. The stability of the roadway is analyzed synthetically on the basis of the stress propagation of the bottom plate and the stress propagation law is analyzed by numerical simulation And to determine the definition of the support of the Shihmen subgrade in the Zhongchang coal mine roadway roadway. On the basis of timely support and permanent support, the active support and the passive support combination are adopted to deal with the surrounding rock Deformation to mobilize the deep rock carrying capacity, to ensure the safety of mining across to improve productivity.