薄基岩破碎顶板工作面回撤通道稳定性及控制研究
Study on stability and control of retracement channel with thin bedrock and broken roof
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摘要: 为降低薄基岩破碎顶板工作面设备回撤期间冒顶和撤架事故等风险,以赵固一矿11271工作面为研究对象,采用理论分析、数值模拟和现场实践等手段,定量分析回撤通道与基本顶断裂线位置不同空间关系下液压支架承受的载荷,确定回撤通道的合理位置,提出上部人工风镐扩帮、下部采煤机扩帮的台阶式扩帮工艺和顶板锚索、煤帮锚杆联合支护技术。现场应用表明:工作面收尾回撤期间液压支架活柱最大累计下缩量为221 mm、最大下缩速率为4.2 mm/h、工作阻力最大变化量为11.2 MPa和顶底板最大移近量为305 mm,满足安全生产要求,回撤通道围岩控制效果良好。Abstract: In order to reduce the risk of roof falling and the accident of removing the supports during equipment withdrawal in the working face with thin bedrock and broken roof, the 11271 working face of Zhaogu No.1 Mine is used as the engineering background, and the theoretical analysis, numerical simulation and field test are used. The loads on the hydraulic support with the different spatial locations of the retracement channel and the basic top fracture line location are quantitatively analyzed, and the reasonable location of the retracement channel is determined. The technology of step expansion is proposed, which uses manpower in the upper part and shearer in the lower part, and the combined support technology of anchor cable supporting roof and bolt supporting coal rib is proposed. The result shows that the maximum cumulative shrinkage of the hydraulic support is 221 mm, the maximum shrinkage rate of the hydraulic support is 4.2 mm/h, the maximum variation of the hydraulic support working resistance is 11.2 MPa, and the maximum displacement of roof and floor is 305 mm, the requirements of safe mining is met, and the surrounding rock control effect of the retracement channel is well.
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Keywords:
- thin bedrock /
- broken roof /
- retracement channel /
- key block /
- reasonable location /
- technology of step expansion
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