厚煤层堆喷混凝土沿空留巷技术研究与应用

Thick coal seamPile shotcrete along the empty laneTechnical research and application

为提高辛安矿煤炭回收率及延长矿井服务年限,在11212-2煤柱工作面运料巷实施沿空留巷,采用“堆喷混凝土沿空留巷”技术留巷长度770 m,超前切顶卸压+补强锚索+堆喷巷旁墙体联合支护。堆喷工艺是一种新型构筑混凝土墙体的方法,将砂石料、水泥、JCT-1喷射混凝土外加剂在潮湿状态下按一定比例搅拌后进行喷射成墙体,堆喷混凝土巷旁墙体发挥隔离采空区和支撑巷道顶板的作用,可对留巷顶板及时提供高强支撑。应用结果表明,该技术成巷效果较好,实现了安全高效、巷旁沿空留巷的目的,具有广泛适应性和推广性。

In order to improve the coal recovery rate and prolong the service life of Xin’an Mine,the gob-side entry retaining was implemented in the transportation roadway of No.11212-2 Face.The length of the gob-side entry retaining was 770 m by the technology of“pile-spraying concrete gob-side entry retaining”.The combined support of advanced roof cutting and pressure relief+reinforced anchor cable+wall near the pile-spraying roadway was adopted.The jet grouting technology was a new method to build concrete wall.The sand and stone,cement and JCT-1 jetting concrete admixtures were mixed in a certain proportion under wet conditions to spray into the wall.The wall near the jet grouting concrete roadway played the role of isolating the goaf and supporting the roof of the roadway,which provided high strength support for the roof of the roadway in time.The application results showed that the technology had good roadway formation effect,achieved the goal of safety,efficiency and gob-side entry retaining,and had wide adaptability and popularization.