论文部分内容阅读
为了研究水位下降对粘性土路堤渗流特征及稳定性的影响,该文基于饱和-非饱和状态路堤渗流及稳定性计算基本理论,采用有限元数值计算方法,分析了水位下降过程中路堤模型内部渗流特征、浸润线及安全系数的变化趋势。得到如下结论:1水位下降开始后,坡面附近土体孔隙水压力下降幅度分别与距坡底的距离成反比、与水位下降速率成正比;2水位下降过程中,坡面附近土体含水率下降幅度分别与距初始水位的距离成反比、与水位下降速率成正比;3水位下降条件下,路堤内部浸润线持续降低,其下降幅度与水位下降速率成正比;4水位下降期间,路堤安全系数先迅速降低,后持续增大,且与非饱和强度成正比。
In order to study the influence of water level drop on the seepage characteristics and stability of the clay embankment, based on the basic theory of seepage and stability calculation of saturated and unsaturated embankments, the finite element numerical method is used to analyze the internal seepage of the embankment model Characteristics, wetting line and safety factor trend. The following conclusions are drawn: 1. After the water level declines, the decrease of pore water pressure near the slope is inversely proportional to the distance from the bottom of the slope, and is proportional to the descending rate of water level. During the descending of water level, The descending rate is inversely proportional to the distance from the initial water level and directly proportional to the descending rate of water level. Under the descending condition of water level, the saturation line inside the embankment continues to decrease, and its descending rate is proportional to the descending rate of water level. During the descending time of 4 water level, First rapidly reduced, then continued to increase, and is proportional to the intensity of non-saturation.