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(1) The overburden or the surface is not allowed to collapse;
(2) Mining precious ore or high, it is required to increase the recovery rate of the mast;
(3) Existing filling systems, filling equipment or ready-made filling materials can be utilized;
(4) Deep mining, if the ground pressure is large, there is a filling body with sufficient strength to alleviate the stress concentration of adjacent unmined columns.
Filling goafs and filling mining methods have different requirements in the filling process. It is not filled with mining, but it is filled once after the mining house is finished. Therefore, the filling efficiency is high. Before filling, it is necessary to firmly seal all the roadways or exits leading to the empty area. If it is filled with water, it should be provided with water filtration structure or overflow dewatering. In the case of dry filling, the upper part is not full and the filling is not dense; when the cementing is filled, the segregation phenomenon of the filling material is serious.
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