岩层采动裂隙分布在绿色开采中的应用

Study and Application of Mining-Induced Fracture Distribution in Green Mining

岩层采动裂隙分布的研究与水体下和承压水上采煤、卸压瓦斯抽放、离层区充填与开采沉陷控制等工程问题紧密相关.通过试验与理论分析,对岩层移动过程中的覆岩采动裂隙动态发育特征及其影响因素进行了深入研究.结果证明:覆岩关键层对离层及裂隙的产生、发展与时空分布起控制作用.基于关键层破断前后采动裂隙动态发育特性与差异,提出了"覆岩离层分区隔离充填减沉法"和卸压瓦斯抽放的"O"形圈理论,并分别应用于我国不迁村采煤试验和卸压煤层气开采实践.

The study of mining-induced fracture distributions is closely related to some mining engineering problems such as mining under or above water bodies,relieved coalbed methane drainage, overburden bed separation grouting and mining subsidence control etc. By means of experiments and theoretical analysis, the dynamic distributions and its influence factors of the mining-induced fractures were studied. The results show that the key strata control the emergence, development and space-time distribution of the overburden bed separations and fractures. Based on the dynamic distribution characteristics of the mining-induced fractures,the method of isolated section grouting for the overburden bed separation space to reduce subsidence and the O-shaped circle theory for relieved-methane drainage were proposed,and they have been applied respectively in some coal mines in China to reduce mining subsidence and to drain relieved methane.