摘要
为解决极松散厚煤层工作面巷道变形严重的问题,采用了巷道围岩蠕变变形破坏分析方法对巷道围岩侧压系数进行测试,分析了极松散厚煤层中锚杆能够产生极大拉拔力的作用机理,对控制巷道变形十分有利,基于此提出了锚杆与U型钢棚架相互增强支护技术。结果表明:使用U型钢棚架与锚杆联合作用的支护方式,不仅使U型钢棚架抗弯能力得到提高,而且巷道帮部和底部的稳定性也随之提高,从而增强了巷道整体稳定性。巷道围岩最终顶底板移近速率为0.021 mm/d,两帮移近速率为0.01 mm/d,证明该技术对极松散厚煤层巷道支护作用是有效的。
In order to solve the serious deformation prohlem of the gateway,a surround rock creep deformation and failure analysis method of the mine gateway was applied to the test on the side pressure coefficient relationship of the gateway surrounding rock. The paper analyzed the function mechanism of the ultra high drawing force from the bolt in the extreme soft thick seam. The high drawing force could be very favorable to control the deformation of the gateway surrounding rock. Thus the mutual reinforcement technology of the bolt anchoring and frame support was provided. The results showed that a support method with a U type frame support and bolt combined function would not only improve the anti bending capacity of the U steel frame support,but also could improve the stability of the gateway sidewalls and the stability of the floor and the stability of the gateway sidewall and floor. Thus the completed stability of the gateway was enhanced. A final convergence rate between the mine roof and floor of the gateway was 0. 021 mm / d,the convergence rate of the two sidewalls along the gateway was 0. 01 mm / d and the technology support role of the gateway in the extreme soft and thick seam was effective.
出处
《煤炭科学技术》
CAS
北大核心
2015年第5期46-50,共5页
Coal Science and Technology
基金
国家自然科学基金重点项目煤炭联合基金资助项目(51134025)
高等学校博士学科重点专项科研基金资助项目(20133415110004)
关键词
极松散厚煤层
锚杆锚固
U型钢棚架
巷道支护
ultra soft thick seam
bolt anchoring
U-steel frame support
gateway support
