Xishan Coal Electricity (Group) Co., Ltd.

针对杜儿坪煤矿中厚煤层综采工作面回采率低、掘进成本高、采掘接续紧张等相关问题,以62709工作面回采巷道为工程背景,结合理论分析和现场工业试验,采用爆破切顶卸压和沿空留巷技术,通过中厚煤层综采工作面切顶卸压控制技术的关键参数优化,确定“切顶卸压+恒阻大变形锚索联合支护”协同控制方案。切顶高度为8m、切顶角度为15°的情况下,具有最佳的切顶卸压效果。现场试验结果表明,在回采过程中,巷道爆破切顶段顶板动量较未切顶段下降约40%,巷道两侧变形量较未切顶段下降约50%。该技术对提高煤炭的回收利用率,缓解生产接续紧张的压力,推动煤炭企业可持续发展有重要作用。

In view of the relative problems of low recovery rate, high excavation cost, tight mining and excavation connection and so on in the fully mechanized mining face of the medium thick coal seam in Du'erping Coal Mine, taking the stoping roadway of the 62709 working face as the engineering background, combined with theoretical analysis and on-site industrial experiments, the blasting roof cutting pressure relief and retaining roadway along goaf technology are adopted. Through the optimization of key parameters of the roof cutting pressure relief control technology in the medium thick coal seam fully mechanized mining face, the collaborative control scheme of "roof cutting pressure relief+constant resistance large deformation anchor cable combined support" is determined. Under the condition of a roof cutting height of 8 m and a roof cutting angle of 15°, the best roof cutting pressure relief effect is achieved. The on-site test results show that during the stoping process, the roof momentum in the blasting roof cutting section of the roadway decreases by about 40% compared to the roof uncutting section, and the deformation amount on both sides of the roadway decreases by about 50% compared to the roof uncutting section. This technology plays an important role in improving the recovery and utilization rate of coal, alleviating the pressure of tight production continuity, and promoting the sustainable development of coal enterprises.