粉煤灰高水短壁部分充填技术研究与实践.

In terms of the technical problems of mining above confined water and under building, on the basis of the systematic analysis on the properties of fly ash high-water material, filling process and “tunnel type coal mining” which is in the prohibited equipment and technology directory in underground coal mining,through theoretical analysis, indoor experiments and field experiment and so on, a fly ash high-water shortwall part filling panel design and related control technologies were studied systematically. The main study topics and conclusions are summarized as follows:① The foaming mechanism of fly ash high-water filling material, properties, filling processes were analyzed;② A shortwall part filling panel design method and mining-filling program and techniques were put forward.The numerical simulations demonstrated that the floor plastic zone was 6-8 m and the roof plastic zone was 10-12 m based on the joint support system of 50 m filling body and 20 m goaf;③ The filling body density,in situ strength and safety coefficient were showed that the top ratio of the filing body and roof was more than 95%, the in-situ strength was 1.93 MPa, the safety coefficient was 6.8, and the joint support system of fly ash high water filling body could be maintained stable;④ The filling body and floor deformation monitoring showed that the roof maximum subsidence was 80 mm, the floor maximum damage depth was 8 m, and the confining bed thickness of the floor was within the safety limit. The study was carried out at No.9111 coal face in Bucun Coal Mine. The relevant research findings could have some referential significance and application value in similar mining conditions. [ABSTRACT FROM AUTHOR]