露天煤矿地下采空区勘查方法与稳定性评价——以山西宁武县寺耳沟煤矿为例

山西省宁武县某露天矿勘查区因历史遗留问题,导致资料丢失,采空区平面位置及空间范围的不确定性为后期治理带来难度。文中提出了露天煤矿地下采空区(空洞)综合勘查方法技术路线,从物探、钻探等工程互相结合验证手段,详细查明采空区空间参数分布,并通过开采条件判别法对采空区地表稳定性进行评估,计算出采空区最终总评分,得到了稳定性的评价等级,对后期工程施工安全及采空火区综合治理具有参考意义。

Exploration methods and stability evaluation of open-pit coal mine underground goaf: Taking Siergou coal mine in Ningwu County,Shanxi Province as an example

This paper takes the ancient mined area of an open-pit mine in Ningwu County as an example. The exploration area is left with history and data is lost, which leads to the uncertainty of the horizontal position and spatial scope of the mined out area,which brings difficulty in later governance. The survey method in the article puts forward the technical route of the comprehensive survey method for the underground goaf of the open-pit coal mine.With combination of geophysical exploration, drilling and other projects, the spatial parameter distribution of the mined out area is figured out in detail, and the surface stability of the mined out area was evaluated by the mining condition discriminant methods. Based on the date got in fildwork, the final total score of the mined out area is calculated and the grade of stability is obtained also. The evaluation grade has a significant effect on the construction safety of the later project and the comprehensive management of the goaf area.