小汪沟铁矿采空区冒落进程控制及监测技术研究

小汪沟铁矿井下存在大规模连续采空区,严重威胁到地表运输公路及矿山附属建筑的安全性。为解除采空区塌陷对地表道路和建筑的威胁,矿山决定向塌陷坑充填废石,以控制塌陷坑的扩展。采用FLAC3D数值模拟的方法对采空区冒透的时间进行了预测,同时对不充填废石和充填废石的塌陷坑地表位移发展分别进行了模拟研究。最后采用钻孔监测技术对采空区的冒落进程进行监测,同时对塌陷坑充填废石后的空区冒落高度变化过程进行了监测。现场实践证明,向塌陷坑内充填废石可以有效控制采空区的冒落进程。

Caving Process Control and Monitoring Technology of Mined-out Area in Xiaowanggou Iron Mine

There are large-scale consecutive underground mined-out areas in Xiaowanggou iron mine，which seriously threatens the safety of highway transportation and subsidiary buildings of the mine.In order to eliminate the threat of mined out area to the roads and buildings，it is decided to backfill the wasted rocks into the collapse pit to control the expansion of the collapse pit.The FLAC3D numerical simulation was used to predict the caving time of the mine-out area，and simulated tests on the surface displacement development of the collapse pit filled with waste rocks or not were carried out.Finally，the caving process of the mined-out area and the variation of the caving height after the waste rocks were filled were monitored by the drilling monitoring process.The field practice suggests that the caving process can be effectively controlled by backfilling the collapse pit with the waste rocks.