充填法开采引起地表移动、变形和破坏的过程分析与机理研究

Analysis and mechanism of ground movement, deformation and fracture induced by underground backfill mining

基于地表GPS监测及地下围岩变形破坏的调查取证等大量数据资料,以金川二矿区为例,针对由充填法开采引起的地表移动、变形和破坏的现状,分别对其进行了滞后于开采的分析、对矿山井巷工程安全影响的后效性分析及空间发展过程分析。指出导致金川二矿采用充填法开采引起地表移动、变形和破坏的滞后期长、后效性强烈的原因,如充填支护作用与间断面的摩擦作用等等,并指出矿体采出至充填体充入期间围岩发生的移动、变形和破坏与整个矿山的地表岩移、变形和破坏的关系,所得的结论与现场基本一致,对今后的生产具有一定的指导意义。

According to large quantity of data obtained from the ground GPS monitoring and underground investigation, the current status of the ground movement, deformation and fracture induced by underground backfill mining in Jinchuan Mine No. 2 was given. Based on the detailed analysis of its development process, the main reason and mechanism of the ground movement, deformation and fracture lagged behind the backfill mining were studied, and the intense aftereffect was analyzed and the formation mechanism was also given. At the same time, the mechanism was well studied in the respect of space development process, indicating the relationship between the rock mass movement, deformation, fracture and the whole mine during the period of cut-and-fill. The obtained conclusion was consistent with that obtained in situ and might be used to guide the future production.