高承压水体上采煤危险性的多因素综合评价研究

Research on comprehensive evaluation of multi factors of mining risk upon high confined water

基于高承压含水层上采煤产生的水文地质工程地质问题的复杂性,建立了高承压水体上采煤危险性多因素综合评价模型,通过分析永煤公司陈四楼煤矿水文地质、工程地质及开采技术条件可知,影响研究区高承压水体上采煤安全性的因素多且复杂,确定了煤层底板破坏深度、煤层底板抗压强度、煤层底板隔水层厚度、煤层底板水压、煤层底板标高和断层密度6个因素影响该研究区煤层高承压水体上开采的主控因素。以21111工作面高承压水体上采煤为例,应用高承压水体上采煤危险性多因素综合评价模型,获得工作面的开采危险性指数分区等级图,根据评价结果指导矿井的煤层底板注浆改造,通过煤层底板注浆改造,21111工作面回采时,整个工作面的涌水量约为5 m3/h,主要为顶板砂岩水,底板基本无水。

As the complexity of hydrogeological and engineering geological problems produced by mining activities above high-pressure water？bearing strata,a multi-factor comprehensive evaluation model on risk assessment of coal mining was developed in this study.On the basis of analyzing hydrogeology,engineering geology and mining technology conditions of Chensilou Coal Mine,we know that the safety of coal mining above high-pressure aquifer can be effected by many complicated factors.Furthermore,failure depth,compressive strength,confining bed thickness,water pressure,and evaluation of coal seam floor,and fault density are identified as the main control factors affecting the mining above high-pressure water bodies in the coal seam of the study area.Taking the 21111 mining face as an example,the multifactor comprehensive evaluation model was used to draw the zoning map of harm index for the mining face above high-pressure aquifer.The evaluation results were adopted to guide the coal seam floor grouting reconstruction.The hydraulic discharge is 5 m^3/h mainly from sandstone roof on 21111 coal mining face,and there are few water on the floor.