乌东德水电站泄洪洞工作闸室施工期围岩稳定性分析

Stability Analysis of Surrounding Rock of Working Chamber in Flood Discharging Tunnel of Wudongde Hydropower Station During Construction Period

鉴于地下洞室群围岩稳定性是影响大型水电工程建设成败的重要因素,依托乌东德水电站泄洪洞工作闸室,围绕闸室埋深大、地应力成因复杂、洞室开挖规模大、岩层走向与洞轴线小角度相交等带来的施工期围岩稳定问题,结合工程地质条件、开挖支护措施和施工进度安排等,建立了三维地质概化有限元模型,依据工程地应力实测资料反演获得闸室区域初始地应力场,进而分析了闸室施工期围岩稳定性,并根据分析结果提出了合理化建议。

The stability of surrounding rock of underground caverns is an important factor affecting the success or failure of large scale hydropower projects.Based on the working chamber of the flood discharging tunnel of Wudongde Hydropower Station,this paper establishes a three-dimensional geological generalized finite element model in combination with the engineering geological conditions,excavation support measures and construction schedule.Based on the in-situ stress measured data,the initial in-situ stress field in the working chamber area is inversed.And then the stability of surrounding rock during the construction period of the working chamber is analyzed,and reasonable suggestions are put forward according to the analysis results.