含水层下综放开采膏体充填技术与应用

针对含水层下厚煤层开采时易发生突水灾害的问题,以陕西某矿为工程背景,提出了1种综放开采过渡支架后方膏体充填技术,阐述了该技术的原理和工艺流程,利用数值模拟、现场观测的方法,分析了架后充填开采导水断裂带发育特征及工作面涌水量变化规律。数值模拟结果表明,采用架后充填技术后,工作面导水断裂带发育为矩形,最大发育高度为67.2 m。现场观测结果表明,采用架后充填技术后,架后充实率可达90%,工作面涌水量由220 m^3/h显著下降到90 m^3/h,工作面推进200 m后导水断裂带最大发育高度为76.8 m。研究结论表明,该技术有效地降低了覆岩导水断裂发育高度,可实现含水层下厚煤层安全开采。

Paste Filling Technology and Its Application in Fully Mechanized Caving Mining Under Aquifer

In view of the problem that water inrush is easy to occur in the mining of coal seam under aquifer, taking a mine in Shaanxi Province as an engineering background, this paper proposes a paste filling technology behind transitional support in fully mechanized top-coal caving mining, expounds its technical principle and technological process, and analyzes the development characteristics of water-conducting fracture zone in back-support filling mining and the variation laws of water inflow in working face by means of numerical simulation and field observation. The numerical simulation results show that the water-conducting fracture zone of the working face develops into a rectangle with a maximum height of 67.2 m after the backfilling technology is adopted. The field observation results show that the filling rate after support can reach 90%, the water inflow of working face decreases significantly from 220 m^3/h to 90 m^3/h, and the maximum development height of water-conducting fracture zone is 76.8 m after 200 m advance of working face. The research results show that the technology can effectively reduce the height of waterconducting fissures in overburden and realize safe mining of extra-thick coal seam under aquifer.