Rapid Filling Technology for Roof Falling Zone at Working Face with Large Mining Height

According to the situations that the large mining height working face is easy to appear roof caving, and the roof falling zone will not only cause the empty-support of hydraulic support, but also easy cause gas accumulation, on the basis of the hazard analysis of caving area, a double liquid quick-setting filling material is developed according to the research of working performance of hydraulic support and the specific situation of roof caving of the working face; the material has the properties of rapid hardening, early strength, light weight and constant resistance. The material will achieve defluidization in 2 min after mixing, and the compressive strength can reach 3 MPa in one day. The fast filling technique is used for caving zone filling at working area, which ensures the normal mining at working face.