Optimization Of Parameter On Top During Top-collapse Engineering And Research Of Concerned Technology Of Mining At East Part Of Jinshandian Iron Mine

Taking the worked-out area at east part of Jinshandian Iron Mine of Mine Company of Wuhan Steal an Iron Group as a case investigats, this paper studies the problem of underground stress on top during top-collapse engineering and concerned technology of mining at the elevation -270m at east part of Jinshandian Iron Mine.Through geological investigation, this paper introduces deformation and failure of surrounding rock theories, and researches into underground stress on top during top-collapse engineering at the elevation -270m at east part of Jinshandian Iron Mine. This engineering adopts the mean that caves the rock is Fan -Pattern Medium-to-long hole blasting in Sub-level caving without sill pillar. On the condition of principle of caving-out body in the top rock, This engineering adopts 15m height of caving-out body in the top rock, scope caving-out body in the top rock, parameters of Medium-to-long hole and adjusts the access space from 11.5m to 15m in order to reduce cost of production.At last, the paper underground pressure numerical simulation is done for Jinshandian Iron Mine during top-collapse engineering at east part of the Mine, and make an analysis of the underground stress redistributing at east part of Jinshandian Iron Mine during top-collapsing process, and then give the Mine theoretical basis to decide sequence of caving correctly and forecast and control of underground stress. The computed results are consistent with the local fact situation; the analysis results give theory basis for safe production in mine.