Study on the Regularity of Ore Pressure in Overburden Hard Rock Working Face of Overburden Mining on Reverse Faults

Abstract

In order to study the mining pressure on the upper coal seam in the fault, the working pressure of the working face with a hard rock roof is based on the production geological conditions of the 3301 working face of Yiqiao Coal Mine. Use flac numerical simulation software to establish a three-dimensional numerical calculation model of mining face, and study the distribution characteristics of mining plastic area, the advance support pressure and elastic strain energy density. And the change curve is treated by origin software fitting function. In the end, it was found that the total volume of the plastic zone and the propulsive distance of the working face showed an exponential function. Before and after the "first square", the total volume of the plastic zone increased more significantly, and the hard roof failure was mainly bending failures; There is a logarithmic function between the advance support pressure and the advancing distance of the working face. The range of 5–14 m in front of the coal wall is a region where the pressure increases sharply. The elastic strain energy density appears relatively high. During the mining process, the advance support of the roadway should be strengthened, and the key monitoring should be carried out. If necessary, corresponding pressure relief measures should be taken to ensure the safe production of the working face.