高边墙地下洞室围岩变形控制一直是地下工程施工的一大挑战,开挖过程中围岩变形破坏问题突出,针对某水电站极破碎围岩开挖过程高边墙变形破坏问题,提出钢支撑控制围岩变形方法。基于数值模拟与现场监测,对不同类型钢支撑结构与围岩支护效果进行定量评价。结果表明:圆形钢管钢支撑结构明显优于组合工字钢支撑结构;采用钢管钢支撑支护后边墙围岩变形得到有效控制,塑性区范围、深度明显减小,应力集中现象有所改善,围岩稳定性显著提高;现场监测与数值模拟结果相互吻合并验证了钢支撑支护效果。相关成果可为极破碎岩体条件高边墙地下洞室围岩变形控制提供借鉴。
Deformation control of surrounding rock in underground caverns with high side wall is always a huge challenge in underground engineering construction, and the deformation and failure of surrounding rock are prominent in the excavation process. Aiming at the deformation and failure of high side wall during excavation of extremely broken surrounding rockmass of a hydropower station, a method of controlling surrounding rock deformation with steel support is proposed. Based on numerical simulation and field monitoring, the effects of different types of steel support structures and surrounding rock support are quantitatively evaluated. The results show that: The circular steel pipe support structure is obviously superior to the composite I-steel support structure. The deformation of the surrounding rock of the side wall is effectively controlled after the steel tube support is adopted, the range and depth of the plastic zone are obviously reduced, the stress concentration phenomenon is improved, and the stability of the surrounding rock is significantly improved. The results of field monitoring and numerical simulation agree with each other and verify the effect of steel support. The relevant results can provide reference for the deformation control of the surrounding rock of the underground cavern with high side wall under the condition of extremely fractured rockmass.
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