浅埋厚硬顶板沿空留巷“支-卸”协同围岩控制技术

    A “support and pressure relief” collaborative strata control technology for gob-side entry retaining with shallow buried thick hard roof

    • 摘要: 为解决浅埋高强度开采工作面留巷速度慢、充填材料用量大等问题,本文以某矿50108工作面为背景,采用覆岩结构理论分析及巷旁支柱实验室试验相结合的方法,确定了以水力压裂卸压及巷内、巷旁高强支护为核心的“支-卸”协同围岩控制技术及其具体内容,指导了巷旁支护体选型设计。在该工作面进行工业性试验,并设置围岩位移监测站,对巷道留巷、复用期间围岩变形情况进行了监测。研究结果表明:控制厚硬顶板工作面采空侧悬顶运移及偏载传递是沿空巷道围岩控制的关键;保障围岩稳定的巷旁支护体临界延米支护阻力为6 251.25 kN,结合原型支柱试验结果,确定50108工作面的合理巷旁支护选型为直径800 mm、外约束波纹管的混凝土支柱;“支-卸”协同混凝土支柱沿空留巷技术应用后,充填材料用量减少50%以上,巷道满足工作面正常生产需求,实现了资源高效回收,应用效果通过现场监测得到验证。

       

      Abstract: In order to solve the problems of slow roadway retaining speed and large amount of filling materials in shallow buried high strength mining face, this paper takes the 50108 working face of a certain mine as the background, adopts a combination of theoretical analysis of overlying rock structure and laboratory tests of roadside pillars, determines the “support and pressure relief” collaborative control technology and its specific content, with hydraulic fracturing pressure relief and high-strength support in and around the roadway as the core, and guides the selection and design of roadway side support body. The industrial experiments are conducted on the working face, and a strata control displacement observation station is set up to monitor the deformation of the strata during the retaining and reuse of the roadway. The research results show that the key to strata control for gob-side entry retaining is to control the movement of suspended roof and the transfer of eccentric load in thick hard roof working face. The critical linear meter support resistance of roadway side support to ensure the stability of strata is 6 251.25 kN. Combined with the prototype pillar yielding test, it is determined that the reasonable roadway side support type of 50108 working face is 800 mm diameter concrete pillar with externally constrained bellows. After the application of “support and pressure relief” collaborative concrete pillar gob-side entry retaining technology, filling material consumption reduced by more than 50%, the roadway meets the normal production demand of the working face and realizes the efficient recovery of resources. The application effect is verified through on-site monitoring.

       

    /

    返回文章
    返回