综采工作面通过走向空巷充填技术研究与实践

Research and practice of filling technology in fully mechanized working face through the trend roadway

以综采工作面通过走向空巷为工程背景,综合运用现场调研、理论计算、数值模拟和工业性试验等手段,研究走向空巷围岩失稳机理,指出高跨比是影响空巷围岩稳定的关键因素;推演了空巷顶板变形破坏演化的4个阶段,提出空巷围岩控制应该遵循及时支护和减小顶板跨度原则;从技术和经济效益角度对比传统过空巷方式,提出了综采工作面通过走向空巷高水材料充填控顶技术,揭示了充填体对空巷顶板的作用机理,确定出充填体关键参数:充填体抗压强度为1.0 MPa,高水材料的水灰质量比为8∶1。在此基础上,设计了走向空巷充填技术及工艺。工业性试验表明:综采工作面过空巷期间,该充填体能够有效支撑顶板且未明显影响正常煤炭开采,保障了煤炭资源的安全开采。

Taking the fully mechanized working face through the trend roadway as the engineering background,the field investigation,theoretical analysis,numerical simulation andindustrial tests were comprehensively used,the instability mechanism of the trend roadway was studied,which pointed out that the depth-span ratio was the key factor affecting the stability of the trend roadway;the four stages with deformation and failure evolution of trend roadway roof were deduced,the principle of timely support and reduction of roof span should be followed for controlling the roof of trend roadway was proposed;comparing the traditional method through the trend roadway from the perspectives of technology and economic benefits,the filling and controlling technology in fully mechanized working face through the trend roadway with the high water material was put forward,the action mechanism of the fillings on the roof of the trend roadway was revealed,and the key parameters of the fillings were identified:the compressive strength of the fillings was 1.0 MPa,and the water-cement mass ratio of the high water material is 8∶1.On this basis,the filling technology and process of the trend roadway were designed.Industrial tests show that during the fully mechanized working face through the trend roadway,the roof is effectively supported by the fillings and the normal coal mining is not significantly affected,the safe mining of coal resources is guaranteed.