龙固煤矿开采后顶底板压力作用下地电场变化规律

Change Law of Geoelectric Field under Pressure of Roof and Floor after Mining in Longgu Coal Mine

矿井水害大多与岩层运动和应力运移相关,而应力可通过地电场的变化表现出来。为探究煤矿开采后的应力变化与矿井水的关系,以龙固煤矿2301工作面顶底板水害动态监测项目为例,采用三维高密度电法探测技术,以视电阻率参数反映地电场变化,绘制地层电阻率三维数据体,结合顶板砂岩水及底板三灰水随工作面开采的运移情况进行研究。结果表明:煤层采动影响顶底板岩石裂隙的发育及闭合,从而使煤层内部的水在应力作用下进行移动;在电性变化上表现为应力集中区呈现高阻异常,应力释放区呈现低阻异常。

Mine water damage is mostly related to rock strata movement and stress migration,the stress can be expressed by the change of the earth electric field.In order to explore the relationship between stress changes after coal mining and mine drainage,the dynamic monitoring project of roof and floor water damage in 2301 working face of Longgu Coal Mine is taken as an example.Using three-dimensional high-density electrical detection technology,the apparent resistivity parameters were used to reflect the variation of the earth electric field,and the formation resistivity 3D data volume was drawn.The movement of roof sandstone water and floor three ash water with working face mining is studied:Coal seam mining affects the development and closure of rock cracks in the roof and floor.So the water in the coal seam moves under the action of stress.In terms of electrical change,the stress concentration area presents high resistivity abnormality,while the stress release area presents low resistivity abnormality.