地震峰值加速度作用下含水边坡稳定性分析

Based on Darcy's law and the hypothesis of drawdown curve in Parabola, seven phreatic surfaces in different hydrous slopes were determined. Another condition that all the slope was full with water had been added to research the importance of the way in determining phreatic surface. Forty-eight calculation models were founded after the chosen of six peak ground accelerations in earthquake which varied from 0 to 0.2 g. Combined with static method，the stability of slope had been analyzed by using strength reduction in FLAC3D. The results show that：(1) The stability of slope drops in straight line with the growth of peak ground acceleration or the moving of phreatic surface from angle to top of the slope，and the latter has a bigger influence.(2) After the slope contains water，its slip plane moves from near the slope surface to the phreatic surface. And if the phreatic surface becomes higher，it will stay nearby and move towards the surface of the slope.(3) When the slope is only influenced by seismic wave，its slip plane will not change too much as the increasing of the peak ground acceleration. After it contains water，the slip plane will move towards the inside of side slope quickly，and failure mode transfers from the shallow slip to the deep slip.(4) The phreatic surface has a great impact on the stability of slope，so it is important to use correct way to determine the phreatic surface.