Study On Movement Of Top-coal And Roof Based On The Action Of Stress Shell

In this paper, compositive research techniques including of three-dimensional numerical simulation, in-situ measurement, equivalent material simulation and theoretical analysis are carried out to investigate the stress distribution, failure mechanism and displacement and movement laws of top-coal and roof in fully mechanized top-coal caving (FMTC) face with thinner-thick seam. The stress distribution, displacement and movement laws of roof and top-coal are put forward. The roof and top-coal failure and movement induced by stress shell, and the roof and top-coal displacement and movement follow damage theory. The results provide a theoretical basis for making a reasonable drawing technology and contribute to further study top-coal caving in fully mechanized top-coal caving face. The results also benefit to improve the recovery and reduce refuse content in FMTC face. At the same time it provides beneficial lessons for other similar fully mechanized long wall top-coal caving mining.