Study on the Instability Mechanism and Grouting Reinforcement Repair of Large-Scale Underground Stopes
Study on the Instability Mechanism and Grouting Reinforcement Repair of Large-Scale Underground Stopes
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大型地下采场失稳机理及注浆加固修复研究
DOI：
10.1155/2020/8832012
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发表时间：
2020-09
影响因子：
1.8
通讯作者：
He Liwen
中科院分区：
文献类型：
--
作者：
Xie Chengyu;Jia Nan;He Liwen
分析了地下采场不合理开采所造成的环境条件、其影响范围内采场注浆加固中浆液扩散机理、大规模失稳坍塌的原因及采场灾变过程，综合运用极限上限线分析理论和数值分析方法，揭示了地下采场连续灾变坍塌模式。提出了基于最大剪应变增量理论确定采场失稳塌陷边界及其范围内滑动面的方法，得到了考虑多场耦合因素的注浆加固过程中浆液扩散半径及范围。结果表明，该大型地下采场坍塌后形成了U型隐患区。影响范围达6个相邻采场，采场呈对称分布，采场失稳表现为应力变化、能量积累、状态变化、失稳塌陷的灾变连锁过程。失稳坍塌破坏模式为楔形坍塌、圆弧旋转、三角平移和条带滑移的组合破坏模式。多物理场耦合数值计算结果表明，注浆浆液扩散半径为12 m，呈椭圆形分布。研究成果可用于地下开采环境的综合治理，从而有效解决采空区上方巷道掘进所面临的安全问题。
The environmental conditions due to unreasonable mining in underground stopes, the slurry diffusion mechanism in the grouting reinforcement of a stope within its influence, the causes of large-scale instability collapse, and the catastrophic stope process are analyzed, and limit upper line analysis theory and numerical analysis methods are comprehensively adopted, revealing the continuous catastrophic collapse mode of large-scale underground stopes. The method of determining the stope instability collapse boundary and the slip surface within the range based on the theory of the maximum shear strain increment is proposed, and the diffusion radius and range of the grouting slurry during the reinforcement process, which considers the multifield coupling factors, are obtained. The results show that the U-shaped hidden danger area formed after the collapse of the large-scale underground stope. The influence range reaches six adjacent stopes, which are symmetrically distributed around the collapse; the mining instability is manifested as a catastrophic chain process of stress change, energy accumulation, state change, and instability collapse. The damage mode of instability collapse is a combination method of wedge collapse, circular arc rotation, triangular translation, and strip slip. According to the multiphysics coupling numerical calculation, the diffusion radius of the grouting slurry is 12 m, exhibiting an elliptical distribution. The research results can be used to comprehensively control the underground mining environment, thus effectively solving the safety problems faced by tunnel or roadway excavations above the goaf.
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影响因子：
5.3
作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
10.1007/s10064-012-0438-3
发表时间：
2012-09
影响因子：
4.2
作者：
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通讯作者：
D. Mao;B. Nilsen;Mingxu Lu