摘要
为解决深井高应力巷道围岩变形破坏问题,结合强力支护理论及巷道围岩变形与支护时机关系分析了深井巷道强力-分次支护的力学机制,提出了一次锚网喷、二次全断面锚注配合底板鸟笼锚索相协调的强力-分次支护技术,现场应用实现了深井巷道围岩变形可控。结果表明:随一次强力支护时间延长,深井巷道围岩变形速度先降低后变缓再突然增加,二次支护的最优时机为围岩变形速度变缓阶段。
Aiming at the serious surrounding rock deformation and failure of high stress roadway in deep coal mine,the main influence factors of roadway deformation and failure were analyzed. Combining with powerful support theory and the relationship between time-dependent deformation and optimum support time of surrounding rock, the powerful and multi support mechanical mechanism of roadway was researched. And the powerful and multi support technology of the primary bolting and guniting support coordinating with the second full-face anchoring + grouting and floor birdcage anchors support was provided.Then the deformation of roadway was controllable in field application. The results show that: the deformation velocity of surrounding rock reduces first, and then changes slowed down, and suddenly increases finally;the optimum time for secondary support is during the deformation slow down period.
作者
于洪
李春元
董明丽
YU Hong;LI Chun-yuan;DONG Ming-li(Zhaogu(Xinxiang)Limited Company of Jiaozuo Coal Industrial Group,Henan Energy and Chemical Industry Group Co.,Ltd.,Xinxiang 453634,China;School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《煤炭工程》
北大核心
2020年第2期46-51,共6页
Coal Engineering
基金
国家自然科学基金资助项目(51904303)。
关键词
深井高应力
巷道围岩
强力支护
分次控制
high stress in deep coal mine
surrounding rock of roadway
powerful support
multi control
