复合勘探技术在煤矿工作面水害防治中的应用

现有煤矿工作面水害复合勘探技术大多采用常规回转钻进成孔方法,钻孔数量多、工作量大,且施工过程中钻杆弯曲变形、孔内地层变化、钻进工艺参数改变等会导致钻孔发生偏斜,从而导致探水决策失误。针对该问题,提出一种基于定向钻进的复合勘探技术,并将其应用于某煤矿综采工作面水害探测。应用过程如下:先采用矿井音频电透技术探测工作面低视电阻率异常区,再采用定向钻进技术直接揭露富水区,通过观测钻孔涌水量和化验钻孔涌水水质,确定异常区存在导水奥灰岩溶陷落柱,并圈定了陷落柱在该工作面内的延展状态和边界;根据复合勘探结果,指导更改切眼位置,有效消除了工作面开采揭露导水陷落柱导致突水事故的隐患。

Application of comprehensive exploration technology for water-hazard prevention in coal mine working face

Most of existing comprehensive exploration technologies for water-hazard on coal mine working face adopt conventional rotary drilling method with lots of boreholes and heavy workload.In addition,blending deformation of drill pipes,geological condition variation in boreholes and alterations of drilling parameters during construction process would lead to borehole deflection,which may cause wrong decision about water-hazard exploration.For above problems,a comprehensive exploration technology based on directional drilling was proposed and applied to water-hazard detection on fully mechanized mining face of a coal mine.The application process is as follows:Firstly,mine audio-frequency electric penetration technology is used in the comprehensive exploration technology to detect anomalous area with low apparent resistivity on the working face,and then directional drilling technology is adopted to directly expose water-rich zone.It is determined that there is a water-conductive collapse column of Ordovician limestone karst in the anomalous area through observing water gushing in the boreholes and chemically examine quality of the water.Meanwhile,extension state and boundary of the water-conductive collapse column in the working face are delineated.Position of open-off cut is redesigned according to comprehensive exploration results,so as to effectively eliminate hidden water-inrush danger caused by exposing the water-conductive collapse column during mining process.