汶川大地震都江堰市白沙河堰塞湖工程地质力学分析

5.12汶川大地震引发了大量的直接和次生地质灾害，对人的生命和财产安全造成了极大的威胁，其中由于地震造成的堰塞湖是一种典型的次生地质灾害。结合都江堰市白沙河无人区的3个堰塞湖(枷担湾、窑子沟和关门山)现场工程地质调查结果和区域内的工程地质条件，对堰塞湖的形成过程和现状进行相关分析，分析表明：堰塞湖是由于地震引发的山体滑坡堵江而形成的，由于山体滑坡方量大，迅速从河谷一侧冲向另一侧，因而形成了一侧高、另一侧低的堰塞坝体型。然后对堰塞坝的渗透稳定性和库岸边坡稳定性进行分析，结合现场堰塞湖的应急处理措施，给出了白沙河无人区3个堰塞湖的后续治理建议。

ENGINEERING GEOMECHANICAL ANALYSIS OF THE BARRIER LAKE IN BAISHA RIVER NO MAN'S REGION LOCATED AT DUJIANGYAN CITY INDUCED BY 5.12 WENCHUAN EARTHQUAKE

5.12 Wenchuan earthquake triggered a large number of direct and secondary geological disasters, which caused a grave threat on human life and property, as a result of the barrier lake caused by the earthquake is a typical secondary geological disasters. Combination of Dujiangyan City, Baisha River no-man's land of the three barrier lake(Jiadanwan, Yaozigou and Guanmenshan) site engineering geological findings and regional engineering geological conditions, the formation of the barrier lake processes and the status of correlation analysis, its shows that: barrier lake are a result of the earthquake triggered landslides walling up river, due to landslide volume is huge, and quickly dashed from the side to the other side of the valley, creating a high-side and a other low side of barrier lake. And then the seepage stability of barrier lake dam and the slope stability of reservoir banks are analyses, combined with the scene emergency treatment measures of the barrier lake, some recommendations deal with Baisha River no-man's land of the three barrier lake are put forward.