黄陵二号煤矿巷道支护现状及控制措施
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摘要
针对陕西黄陵二号煤矿不同类型巷道的支护形式和参数,采用对比分析和理论计算方法,定性剖析了巷道失稳破坏类型及其原因,定量研究了不同巷道的支护强度。研究结果表明:矿井巷道围岩破坏特征主要以顶板离层、冒落、帮部内臌或片帮以及强烈底臌为主;锚杆长度短、锚杆预紧力小、锚杆托盘强度低、锚索索体易锈蚀和拉剪破坏是造成巷道围岩难以有效控制的主要诱因;提出了锚杆3次预紧、增加托板厚度、增大锚杆直径和长度、采用19芯防腐锚索等主要优化措施。
In view of the present situation of roadway support in Huangling No.2 Coal Mine,the types and causes of roadway instability and failure were analyzed by using comparative analysis and theoretical calculation method.The results show that the main failure characteristics of the surrounding rock in the mine roadway are roof separation,rib spalling and floor heave,and the main causes of roadway failure are short length of bolt,small pre-tightening force of bolt,low strength of bolt tray,and easy corrosion of anchor cable.The main optimization measures such as three times pre-tightening of bolt,increasing the thickness of bolt tray,increasing the diameter and length of bolt,and adopting 19 cores anti-corrosion anchor rope were proposed.
In view of the present situation of roadway support in Huangling No.2 Coal Mine,the types and causes of roadway instability and failure were analyzed by using comparative analysis and theoretical calculation method.The results show that the main failure characteristics of the surrounding rock in the mine roadway are roof separation,rib spalling and floor heave,and the main causes of roadway failure are short length of bolt,small pre-tightening force of bolt,low strength of bolt tray,and easy corrosion of anchor cable.The main optimization measures such as three times pre-tightening of bolt,increasing the thickness of bolt tray,increasing the diameter and length of bolt,and adopting 19 cores anti-corrosion anchor rope were proposed.
引文
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[2] 东兆星,吴士良.井巷工程[M].徐州:中国矿业大学出版社,2009.
[3] 康红普,王金华.煤巷锚杆支护理论与成套技术[M].北京:煤炭工业出版社,2007.
[4] 李志兵,张荣,韩昌良,等.锚固预紧力与预紧力矩相互关系的研究[J].中国矿业大学学报,2012,41(2):189-193.
[5] 张广云.锚杆预紧扭矩与预紧力关系研究[J].科技情报开发与经济,2011,21(1):195-198.
[6] 康红普,陆士良.巷道底臌机理的分析[J].岩石力学与工程学报,1991,10(4):362-373.