Study on deformation failure mechanism and support technology of deep soft rock roadway
Study on deformation failure mechanism and support technology of deep soft rock roadway
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深部软岩巷道变形破坏机理及支护技术研究
DOI：
10.1016/j.enggeo.2019.105262
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发表时间：
2020-01-01
影响因子：
7.4
通讯作者：
Liu, Gang
中科院分区：
文献类型：
--
作者：
Li, Guang;Ma, Fengshan;Liu, Gang
巷道支护一直是采矿工程中的难题，特别是在深部软岩巷道中，能否提供持久有效的支护，直接影响到矿井的安全生产和可持续发展。为了解决深部软岩巷道的支护问题，有必要弄清深部软岩巷道的变形破坏机理。介绍了甘肃金川二矿区深部软岩巷道变形破坏机理及支护技术。在详细的现场调查和前人研究经验的基础上，总结了巷道变形破坏的模式、影响因素、规律和机理。通过数值模拟计算和现场试验，对“双层锚网喷+U型钢”联合支护方案进行了初步评价。为弥补初期支护的不足，提出了“双层长锚网喷+钢管混凝土”联合支护方案。数值模拟、现场监测和经济分析结果表明，新型支护能有效控制巷道变形，具有较高的性价比。最后对深部软岩巷道支护提出了几点建议，旨在为其他工程提供参考。
The roadway support has always been a difficult problem in the mining engineering, especially in the deep soft rock roadway, whether it can provide endurable and effective support directly affects the safety production and sustainable development of the mine. In order to solve the supporting issues, it is necessary to make the deformation failure mechanism of deep soft rock roadway clear. This paper describes a case study of the deformation failure mechanism and support technology of deep roadway with soft rock mass in No.2 mine zone of Jinchuan mine that is located in Gansu Province, China. Based on a detailed field investigation and previous research experience, the modes, influencing factors, laws and mechanisms of deformation failure in the roadway are summarized. Then the primary combined supporting scheme "double layer bolt-mesh-shotcrete and U-shaped steel" is evaluated through numerical simulation calculation and onsite experiments. To make up for the shortcomings of the primary support, an improved combined supporting scheme "double layer long bolt-mesh-shotcrete and CFST (concrete filled steel tube)" is proposed. The results of numerical simulation, field monitoring and economic analysis show that the new support can control the deformation of the roadway effectively and has a high cost performance. Finally, several suggestions for supporting in deep soft rock roadway are put forward, aiming at serve as a reference for other engineering.