Study on Height of Water Flow Fracture Zone in Fully Mechanized Caving Face

In order to study the height of the water flow crack zone in the overburden strata of the fully mechanized longwall top coal caving mining face and to provide the basis to the design of the mining,according to the mining and technical conditions and the rock mechanics performances parameters of the fully mechanized longwall top coal caving mining face in a mine,a similar simulation experiment model was established to study the height of the water flow crack zone after the overburden strata failed.A comparison was conducted on the study results and the empirical formula.A regression analysis method was applied to correct the empirical formula.The advancing distance affected to the water flow crack zone was considered.Thus a new and effective method could be provided to predict the height of the water flow crack zone in the overburden strata.