高应力软岩巷道灌浆支护技术研究与应用
Research and Application of Grouting Support Technology in High-stress Soft Rock Roadwa
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摘要: 针对贵州某矿141712运输上山围岩大变形、锚杆索失效严重等问题,运用现场调研、理论分析、室内试验、数值模拟等研究方法分析了软岩巷道围岩变形破坏机制,提出灌浆支护技术并分析其支护原理,设计了“锚杆+锚索+灌浆+双U型钢”的联合支护方案,最后通过理论计算、数值模拟以及工业性试验对设计的控制方案进行了验证。研究结果表明:围岩强度低,自稳能力差、高应力且应力环境复杂、支护构件支护阻力低以及未对关键部位进行加强支护是造成巷道围岩变形破坏的主要原因;采用设计的支护方案后,围岩变形量减少了35%,满足现场应用要求。Abstract: Aiming at the problems of the large deformation of the surrounding rock and the failure of the anchor cable in 141712 transportation uphill of a mine in Guizhou Province, the field deformation, failure analysis, laboratory analysis, numerical simulation and other methods were used to analyze the deformation and failure mechanism of surrounding rock in soft rock roadway, and the grouting support technology was proposed. The supporting principle of “bolt + anchor cable + grouting + double U-shaped steel” was designed. Finally, the control scheme of the design was verified by theoretical calculation, numerical simulation, and industrial test. The research shows that: the low strength of surrounding rock, poor self-stability, high stress and complex stress environment, support material support resistance bottom and no support for key parts are the main reasons for deformation and damage of roadway surrounding rock; after adopting the designed support scheme, the deformation of surrounding rock is reduced by 35% to meet the requirements of field application.
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Keywords:
- high stress /
- large deformation /
- soft rock roadway /
- damage mechanism /
- grouting support technology
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