应变软化边坡渐进破坏模式及稳定性可靠度

Progressive Failure Mode and Stability Reliability of Strain-Softening Slope

针对现有考虑应变软化效应的边坡渐进破坏分析模型中计算假定条件不符合实际情况的不足,以三峡库区赵树岭滑坡为研究对象,考虑地下水位波动和地震力的影响,提出用于分析多场耦合条件下应变软化边坡渐进破坏模式及稳定性可靠度的方法.结果表明,地下水位波动和地震力会不同程度地影响滑坡的渐进破坏模式和破坏概率.滑坡在145 m、175 m水位和库水位从175 m陡降为145 m三种工况下整体稳定,但分别有14.119%、20.266%和21.797%的概率发生局部渐进破坏;在烈度为Ⅶ的地震力作用下同时考虑3种蓄水工况,该滑坡分别有34.067%、38.061%和38.405%的概率发生整体渐进破坏;根据滑坡渐进破坏模式指出最佳加固位置应在沿江大道前沿.该分析方法具备可靠性,可为边坡的渐进破坏模式及稳定性评价研究提供参考.

Aiming at the shortcomings of the calculation assumptions proposed in the existing slope progressive failure analysis model considering the effect of strain-softening,the Zhaoshuling landslide in the Three Gorges Reservoir area is taken as the research object,and the influence of groundwater level fluctuations and seismic forces is considered to propose the progressive failure mode and stability reliability analysis method of strain-softening slope under multi-field coupling conditions.The results show that the groundwater level fluctuation and seismic force would affect the progressive failure mode and failure probability of the landslide to various degrees.The landslide was stable at 145 m,175 m water level and the steeply reduced reservoir water level from 175 m to 145 m,but it had a local progressive failure probability with 14.119%,20.266%and 21.797%respectively.And the landslide had a total progressive failure probability with 34.067%,38.061%and 38.405%respectively under the action of seismic force with intensity VII,also three kinds of water storage conditions were considered.Moreover,according to the progressive failure mode of landslide,it is pointed out that the best reinforcement position should be at the front of Yanjiang Avenue.The analysis method is reliable and can provide a reference for the progressive failure mode and stability evaluation of slopes.