Simulation and Field Measurement Study on Roof Strata Behavior of Fully Mechanized Caving Face

In order to reveal the related law between strata behavior and rock burst of fully mechanized caving face, this paper discussed the relationship between the distribution of abutment pressure and energy in front of the coal wall of fully mechanized caving mining face from the point of view of energy. Taking 1304 working face in Yangcheng coal mine as background, using numerical simulation of FLAC3D, it also studied the influence range of support pressure, the law of stress concentration and the distribution of residual energy under different positions of the working face at different advancing steps. And combined with the field measurement, it further determined the peak position of the bearing pressure and the range the bearing pressure and the influence of the mining area. The research shows that: (1) the support pressure peak is located in the front of the coal wall 10 similar to 15m; the obviously influence range of bearing pressure is 60m; the mining influence range is 120m; the numerical simulation is basically consistent with the result of field measurement; (2) The distribution of energy difference curve and supporting pressure in front of working face is approximately similar. Near the peak of supporting pressure, the value of energy difference is higher, and rock burst is easy to occur; (3) The support pressure and energy distribution in front of the coal wall are different along the orientation of the working face. Under the same advancing step, the peak value of pressure and peak energy difference of the lower end of the working face is larger than that of the working face, and the upper end is the smallest.