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为研究坡前水位升降对炭质泥岩-粉土分层填筑路堤边坡渗流特征及稳定性的影响,结合饱和-非饱和渗流理论与非饱和抗剪强度理论对分层填筑路堤在不同水位升降速度下的渗流特征与边坡稳定性进行数值分析,并探讨了分层交错填筑厚度对路堤稳定性的影响。分析表明:1坡前水位上升引起路堤土体积含水率与孔隙水压力升高,坡前水位下降后,路堤顶部土体体积含水率与孔隙水压力继续升高,其余位置则逐渐降低,且坡面附近的降低幅度要大于路堤内部;2特征截面沿高程方向上的含水率分布具有明显的分层差异性;3坡前水位升降过程中,路堤边坡安全系数呈现先增大、后减小、再增大的变化规律;4炭质泥岩-粉土分层填筑路堤的最佳分层交错填筑厚度为炭质泥岩与粉质粘土填筑层厚度均为1.5m。
In order to study the influence of water level rise and fall on slope on the seepage characteristics and stability of embankment stratified with carbonaceous mudstone and silt, combining with saturated-unsaturated seepage theory and unsaturated shear strength theory, The seepage characteristics and slope stability are analyzed numerically with the ascending and descending speed of water level, and the influence of staggered staggered filling thickness on the stability of embankment is discussed. The analysis shows that: 1. The rise of water level before slope causes the volumetric water content and pore water pressure of embankment to increase. After the water level decreases, the volumetric water content and pore water pressure at the top of embankment continue to increase, while the rest decreases gradually. The decrease of water content near the surface of the embankment is larger than that inside the embankment. (2) The distribution of water content along the elevation direction has obvious stratification differences. During the process of water level rise and fall of the slope before 3, the safety factor of embankment slope firstly increases and then decreases , And then increase the variation; 4 carbonaceous mudstone - silt stratified filling embankment staggered staggered filling thickness of carbonaceous mudstone and silty clay filling thickness are 1.5m.