软弱顶板条件下综采工作面矿压演化及控制技术研究

Research on Mine Pressure Evolution and Control Technology of Fully Mechanized Mining Face under Weak Roof Conditions

  • 摘要: 针对软弱顶板综采工作面强矿压显现问题,以山西乡宁焦煤台头煤焦2#煤层首采面为工程背景,通过“点-线-面”耦合监测手段,构建熵权-可拓风险评估模型,将工作面划分为安全、预警、危险三个区域,实现矿压风险的精准管控。在此基础上,提出“高初撑力支架支护+定向水力致裂卸压+超高强锚索网护表”三位一体控制技术。试验表明,应用该技术后工作面周期来压步距提高36%,支架阻力峰值降低11%,月推进度从75 m提升至98 m,年创经济效益1640万元,最终形成可复制推广的软弱顶板矿压控制技术范式。

     

    Abstract: Aiming at the problem of strong mine pressure behavior in the fully mechanized mining face with weak roof, taking the first mining face of the 2# coal seam in Taitou Coal Coke, Xiangning Coking Coal, Shanxi Province as the engineering background, through a coupled monitoring mean of "point-line-face", an entropy weight-extensible risk evaluation model is constructed, the working face is divided into three zones: safety, early warning, and danger, and a precise management and control of mine pressure risks is achieved. On this basis, a three in one control technology of "high initial support force bracket support+directional hydraulic fracturing and pressure relief+ultra-high strength anchor cable net surface protection" is proposed. The test shows that after applying this technology, the periodic weighting step distance of the working face is improved by 36%, the peak value of support resistance is reduced by 11%, the monthly advancement progress is improved from 75 m to 98 m, and the annually created economic benefit is 16.4 million yuan. A replicable and promotable technical paradigm for weak roof mine pressure control is ultimately formed.

     

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