摘要
采用包辛涅斯克(Boussinesq)非稳定渗流微分方程,以巴东李家湾滑坡为例,求解库水位不同降速、不同降雨强度和降雨历时工况下地下水浸润线的位置,并采用传递系数法对各种工况下滑坡的稳定性进行计算,结果表明:在无降雨条件下,滑坡的稳定性随着库水位下降速度的增大逐渐变差;在有降雨条件下,随着降雨强度的增大、降雨持续时间的增长,滑坡的稳定性逐渐变差,尤其是遇到特大暴雨天气或降雨持续3 d以上,有可能发生整体失稳。
To solve the phreatic line location of soil slope in the combined effects of drawdown and rainfall, based on the Boussinesq＇s differential equation of unsteady-seepage, this paper takes Lijiawan landslide for example to simulate the phreatic line location in the different conditions of drawdown velocity,rainfall intensity and rainfall duration. Then the paper discusses the landslide stability in every condition using transfer coefficient method. The results show that when it dose not rain,the stability of landslide becomes worse with the increasing acceleration of the decline of reservoir level; when it is in the state of rainfall,the stability of landslide gets equally worse with the strengthening of intensity and the rainfall duration. The landslide will probably get failure especially when it suffers from heavy rain weather or the rain lasts for 3 days or more.
出处
《安全与环境工程》
CAS
2010年第3期5-9,共5页
Safety and Environmental Engineering
