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溪洛渡水电站泄洪洞采用有压接无压洞内龙落尾的型式,有压段末端设工作闸门室。为了论证泄洪洞工作闸门室开挖支护方式的可行性和合理性,本文根据地形地质条件和结构布置特点,采用三维非线性有限元法建立了相应的计算模型,对泄洪洞工作闸门室从施工开挖到支护进行了全过程仿真,对围岩变形特征、应力状态以及塑性区分布等进行计算分析,确定了围岩稳定支护参数。通过施工过程的监测资料与计算结果的对比分析,印证了应力、变形及塑性区分布的特点,说明设计方案是合理的。
The Xiluodu Hydropower Station spillway tunnel is made of a non-pressured hole with a crimp-type tail dragon tail, there is a working pressure end of the gate room. In order to demonstrate the feasibility and rationality of the excavation and support method for the sluice tunnel work gate chamber, this paper established a corresponding calculation model based on the topography and geological conditions and structural arrangement characteristics, and used three-dimensional nonlinear finite element method The whole process of excavation was carried out. The deformation characteristics, the stress state and the distribution of plastic zone were calculated and analyzed, and the parameters of surrounding rock stability support were determined. Through the comparison and analysis of monitoring data and calculation results of construction process, the characteristics of stress, deformation and plastic zone distribution are confirmed, which shows that the design scheme is reasonable.