Abstract: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.