中文摘要：

库岸深层老滑坡在季节性降雨和周期性库水位变动联合作用下往往表现出间歇性复活特征。在这一复活过程中,滑动期与间歇期交替出现,滑带土经历不同速率的剪切和不同时长的固结。从滑动期内残余强度的剪切速率效应、间歇期内峰值抗剪强度的恢复特征以及间歇期过渡到滑动期的孔隙水压力触发过程3个方面着手,建立了描述库岸深层老滑坡间歇性复活的动力学方程。塘角村1号滑坡滑带土试样的环剪试验结果显示：残余强度在较小速率范围内表现出负速率效应,而当剪切速率达到一定值后残余强度不再减小,且有微弱增长趋势;峰值强度在短时间内有较明显的恢复,但在较小位移后衰减至残余强度;孔隙水压力触发剪切破坏的发生滞后于所施加的水压力,这一滞后过程为孔隙水压力的扩散过程。基于试验成果,根据所建立的动力学方程,对库岸深层老滑坡间歇性复活的动力学机制进行了讨论,从而为此类滑坡的预测和防灾减灾提供有价值的参考。

英文摘要：

The deep-seated reservoir ancient landslide often shows intermittent reactivation which corresponds to seasonal rainfall and periodic reservoir water level fluctuation. In this kind of reactivation, sliding and sliding dormancy occur alternately. This means that the sliding zone soils may experience shearing at different shear rates and consolidation with different durations. The kinetic equations are established based on three aspects, i.e., shear rate effect of residual shear strength in sliding, peak shear strength recovery in sliding dormancy and the initiation of sliding from sliding dormancy caused by pore-water pressure. Ring shear tests are performed on the soil samples from slip surface of Tangjiaocun-1 landslide in this paper. The results show that the residual shear strength is negatively dependent on the small range of shear rates and there is no decrease of residual shear strength after a larger shear rate even with a trend of small increase; the peak shear strength can be recovered within a short consolidation duration after the shearing ceased whereas the strength recovery is lost after a small shear displacement; and shear failure triggered by pore-water pressure lags behind the increase of pore-water pressure applied on sample, the lag implies pore-water pressure diffusion. The kinematic mechanism is then discussed based on the results of ring shear tests and the kinetic equations established above. These results may provide help for the prediction of deep-seated reservoir ancient landslides due to rainfall and/or reservoir water level fluctuation.