采动作用下浅埋岩溶洞塌陷的数值模拟研究

Numerical Simulation Study on Subsidence of Shallow-buried Karst Caves under Mining

基于坪湖矿的塌陷情况,运用UDEC模拟软件对采动作用下浅埋岩溶洞塌陷的过程进行模拟。结果表明,在采动作用下浅埋岩溶洞塌陷的大致过程分为:溶洞的潜伏阶段、溶洞顶板垮落形成开口溶洞阶段、土洞不断发育阶段、地表塌陷阶段;溶洞顶板破坏的原因是由于水平应力的急剧减少造成的。模拟结果为采动作用下岩溶塌陷机理提供了分析依据,对于岩溶地区的生态保护有重要意义。

The subsidence process of shallow-buried Karst caves under mining is simulated by UDEC simulation software,which shows that the subsidence process is divided into latency stage,open cave stage after roof collapse,soil cave development stage and surface subsidence stage;and the sharp decrease of horizontal stress results in the cave roof failure.