时间域电磁法在皖北刘一矿注浆效果检测中的应用

Application of Time Domain Electromagnetic Method on Grouting Effect in Liuqiao No.1 Coalmine, Northern Anhui

针对煤矿生产建设中工作面底板隐伏导(含)水构造的问题,基于时间域电磁法理论,对刘一矿Ⅱ665工作面一段进行了底板导水构造探测。根据井下工作条件,采用边长为2 m×2 m正方形多匝重叠回线装置进行探测,其中发射线框40匝、接收线框60匝,探测线框与底板夹角为45°。通过分析该区视电阻率的颁布规律,将视电阻率值小于1.5Ω.m作为判别依据,解释了3个含水裂隙发育区域。在横坐标100m处布设3个钻探孔,其出水量分别为10m?/h,23m?/h,20m?/h,证实3个异常区富水性较强。对3体个孔进行注浆改造加固后,3个孔均无出水现象,重新探测发现,其工作面视电阻率普遍大于2Ω·m,为相对高阻反映,表明注浆前后的探测结果可靠,注浆质量较高。

In allusion to working face floor hidden water conducting （bearing） structure issue during coalmine production and construction, based on time domain electromagnetic method theory, carried out floor water conducting structure detection in the first sector of II 665 working face, Liuqiao No.1 coalmine. Based on underground operating condition, side length 2 mx2 m square overlapping multi- loop is used, in which, exciting 40 loops, receiving 60 loops, included angle between detecting loop and floor 45°. Through analysis of apparent resistivity distribution pattern in the area, taking the apparent resistivity less than 1.51μm as the yardstick, interpreted 3 wa- ter-bearing fissure developed regions. 3 boreholes has been laid out at abscissa 100m, with water yield 10m3/h, 23 m？/h and 20 m？/h respectively, 3 abnormal areas with rather strong water yield property identified. After grouting reinforcement, all 3 boreholes have no water outflow once again. Detecting anew, working face resistivity is larger than 21Ω. m generally, relatively high resistivity, thus indicated detecting results before and after grouting are reliable, grouting quality superior.