【摘要】 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。更多还原

【Abstract】 Saturated seepage flow is one of the most important factors to cause instability of slope mass in the mountain area.On considering the movable characteristics problem of straight slope mass under different seepage discharge,the paper firstly built the movable seepage model of straight slope,then analyzed the hydraulic effect of slope body and taken mechanical analysis to get the mechanical formulas,last dissected the movable variation of straight slope under different seepage discharge by applying hydraulics theory and limit equilibrium method.Further,to check the formulas,the paper take meizoseismal area that is Guojuanyan gully which locates at Dujiangyan as an example,analyzed the heights of seepage flow change with seepage discharge,the hydraulic characteristics of the inner slope and the movable variation of straight slope under seepage discharge.Results indicate that the failure and movement of straight slope is due to increasing of the seepage discharge which deteriorates the hydro-environment abruptly,moreover,seepage force come from water head difference promotes the possibility of straight slope to fail which provided a favorable condition for the mixture of seepage water and sediment to transfer to debris flow.更多还原