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地下水渗流是坡面土体失稳的重要因素。针对不同渗流流量条件下平直型坡体的可移动特性问题,建立平直型坡体地下水渗流模型,进而应用水力学理论、极限平衡方法分析坡体内渗流水位变化规律、水力特征,最后对平直型坡体展开力学分析和渗流条件下坡体的可移动性进行探讨。并以汶川地震极震区都江堰深溪沟流域锅圈岩沟为例,对建立的渗流水位深度表达式随渗流流量变化规律进行了分析,同时对坡体内水力变化特征以及渗流对坡体可移动特性进行了探讨。结果表明平直型坡体发生移动是由于坡体内渗流流量增加、渗流水位升高而导致水力环境变化的结果,水头差产生的渗流力增大了坡体剩余下滑力,为后续水流与坡面土体掺混形成泥石流提供了条件。
Groundwater seepage is an important factor in slope instability. According to the problem of the movable characteristics of straight slope with different seepage flow, the groundwater seepage model of straight slope is established, and then the variation law and hydraulic characteristics of seepage water level in slope are analyzed by hydraulic theory and limit equilibrium method. Finally, The mechanical analysis of straight slope and the mobility of slope under seepage condition are discussed. Taking the deep caverns of Shenxincou basin in Dujiangyan, a meizoseis of Wenchuan earthquake as an example, the variation regularity of seepage water level with the seepage flow was analyzed. At the same time, the characteristics of hydraulic changes in the slope and the displacement of seepage to the slope Characteristics were discussed. The results show that the movement of straight slope is caused by the increase of seepage flow in the slope and the change of hydraulic environment due to the increase of seepage water level. The seepage force caused by head difference increases the residual slip force of the slope, Soil adulteration provided debris flow to provide the conditions.