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地应力高、岩石强度应力比低和中间主应力偏高是猴子岩水电站地下厂房的主要地质环境特征,且施工期高边墙围岩稳定性问题普遍、突出。结合开挖揭示的高地应力、围岩坚硬较完整和局部节理裂隙较发育等工程地质环境条件,在总结施工期围岩变形破坏特征和分析监测资料的基础上,研究了高中间主应力条件下地下厂房高边墙围岩补强支护措施,并对其效果进行评价。结果表明,补强支护处的边墙围岩变形速率减小,位移得到了收敛,说明支护合理、有效,为类似工程的围岩补强支护和安全控制提供了借鉴。
The high geostress, low rock strength stress ratio and high intermediate principal stress are the main geological characteristics of the underground powerhouse of the Houziyan Hydropower Station. The stability of surrounding rock of the high side wall is common and prominent during construction. Based on the engineering geologic environment conditions such as high ground stress revealed by excavation, more complete and firm surrounding rock and more development of local joint and fissure, on the basis of summarizing the deformation and failure characteristics of surrounding rock during construction and analyzing and monitoring the data, Underground powerhouse high side wall reinforcement support measures, and evaluate its effectiveness. The results show that the deformation rate of wall rock around reinforcement wall decreases and the displacement converges, which shows that the support is reasonable and effective and provides reference for reinforcement and support of surrounding rock of similar projects.