库水位骤降时坝坡稳定性分析研究

库水位下降过快往往引起坝坡上游失稳。为了研究库水位骤降条件下坝体稳定性受非稳定渗流场的影响情况，采用有限元法，考虑非饱和区的影响对坝体非稳定渗流场进行模拟。利用得出的瞬态渗流场分布等结果，运用极限平衡法对坝坡稳定性进行计算分析。结果表明：非稳定渗流场分布影响上游坝坡稳定性；水位下降速度越大，上游坝坡稳定性降低速度越快，...

Analysis on Dam Slope Stability during Rapid Drawdown of Reservoir Water Table

The upstream dam slope would be in unstable state due to the water table drawdown. To study the effect of the water table drawdown upon the stability of upstream dam slope, it is necessary to simulate the seepage field and the changes in stability in the case of the water table drawdown. The unstable Seepage field is simulated by using the method of finite element and considering the effect of non-saturated region. The upstream dam slope stability is calculated by us- ing the limit equilibrium method and the results of transient seepage field distribution obtained from simulation and so on. The real example analysis indicates that the upstream dam slop stability is affected by the distribution of the unstable seepage field, and the greater the rate of water table drawdown is, the faster the stability of upstream dam slope decreases and the larger is the extent.