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| STUDY AND PRACTICE OF ROCK MECHANICS IN JINCHUAN MINE UNDER DEEP EXPLOITATION |
| CAO Ping1，ZHANG Ke1，WAN Linhui1，GUO Huigao2，WANG Yongcai2 |
(1. School of Resources and Safety Engineering，Central South University，Changsha，Hunan 410083，China；
2. Jinchuan Group Co. Ltd.，Jinchang，Gansu 737100，China) |
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Abstract After decades of exploitation in Jinchuan mine，mining depth has reached to 1 000 m. Due to complex geologic condition，high geostress and high hydraulic pressure，the stability of deep mining engineering is a crucial problem. A large number of field geological surveys of 850–1 000 m level in Jinchuan No.2 mining district are carried out. Physico-mechanical parameters，expansion and softening properties of deep typical rock are measured. The change laws of rock mechanics and geostress with mining depth are analyzed. By using geological mechanics(RMR) classification method and rock quality(Q value) classification method，zone maps for quality classification of rock mass in Jinchuan No.2 mining district are plotted. Based on the deep surveys of deformation and failure characteristics in deep roadway in Jinchuan mine，the stabilities of deep roadway excavation and supporting under high geostress and high hydraulic pressure are studied. The result shows that coupled U steel-anchor supporting technology performs best. By summarizing the practice experience of supporting technique in deep roadway in Jinchuan mine，some new ideas on deep roadway excavation and supporting technologies are put forward. The influence of different extraction methods on the stability of surrounding rock and backfill at depth is investigated. By optimizing the sequence of panel mining stope of ore block，the mining sequence of the “three stope panels”is applied to the mine，which has obvious effect on controlling the displacement of surrounding rock and backfill.
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2012, Vol. 31 
