Study on the development law of advancing support pressure on fully mechanized caving face

In order to master the law of pressure manifestation in fully mechanized caving face, numerical simulation method is adopted to establish a physical and mechanical model for analysis. The results show that the load on the working face support is mainly the deformation pressure produced by the deformation of the top coal and the basic roof. Therefore, increase of the setting force and working resistance can improve the structural state of the roof and maintain the stability of the lower top coal. The supporting pressure in front of the working face is distributed approximately in a parabola, the peak is located at 4m to 8m in front of the coal wall, and the stress concentration factor at the peak point is 1.3 to 1.7.