超高水充填开采冲击地压防控效果研究

Study on Prevention and Control Effect of Rockburst in Super-High Water Backfilling Mining

深部煤层安全高效、绿色开采是保障国家现代能源经济健康发展的重大课题。为探究超高水充填开采对冲击地压的防控效果,以山东义能煤矿CG1302工作面为工程背景,采用理论分析、数值模拟和现场监测等手段进行探究。归纳得出开采深度、煤岩体力学性质、覆岩条件、地质构造和工作面巷道布置等是诱发冲击地压的主要影响因素,确定义能煤矿具有发生冲击地压的条件。基于能量理论分析了煤体变形能分布规律,计算得到发生冲击地压的最小动能为77 kJ/m^(3);模拟了不同充填率下煤层中能量的积聚情况,与垮落法开采相比,超高水充填开采能有效降低煤层能量积聚程度,从而预防冲击动力灾害的发生。现场微震及煤柱应力监测表明,超高水充填开采有效降低了工作面压力,能达到防治冲击地压的效果。

The safe, efficient and green mining of deep coal seam is a major subject to ensure the healthy development of national modern energy economy. In order to explore the prevention and control effect of super-high water backfilling mining on rock burst, taking CG1302 working face of Shandong Yineng Coal Mine as the engineering background, theoretical analysis, numerical simulation and field monitoring were used to explore. It was concluded that the mining depth, mechanical properties of coal and rock mass, covering rock conditions, geological structure and roadway layout of working face were the main factors inducing rock burst, and the conditions for rock burst in Yineng Coal Mine were determined. Based on the energy theory, the distribution law of coal deformation energy was analyzed, and the minimum kinetic energy of rock burst was calculated as 77 kJ/m^(3).The energy accumulation in coal seam under different filling rates was simulated. Compared with caving mining, super-high water backfilling mining could effectively reduce the degree of energy accumulation in coal seam so as to prevent the occurrence of dynamic disasters. Field microseismic monitoring and coal pillar stress monitoring showed that super-high water backfilling mining could effectively reduce the working face pressure and achieve the effect of preventing rock burst.