考虑潜蚀影响的降雨入渗边坡稳定性分析

发布时间：2018-05-07 13:02

本文选题：降雨 + 边坡稳定性　；参考：《岩土工程学报》2014年09期

【摘要】：在降雨入渗作用下土坡内细颗粒会随渗流发生运移产生潜蚀作用。通过联立颗粒运移方程与非饱和土渗流方程,结合非饱和土水力特性方程和土体潜蚀本构关系,建立了渗流潜蚀耦合的边坡稳定性分析模型。采用有限元方法模拟了降雨入渗作用下潜蚀和入渗的相互作用,分析了初始饱和渗透系数、进气值参数对入渗和边坡稳定性的影响。结果表明:潜蚀主要发生在湿润锋范围内浅层土体,潜蚀加速了湿润锋下行速度,进一步降低边坡稳定性;饱和渗透系数、进气值是影响渗流潜蚀作用的主要因素;当降雨入渗强度大于饱和渗透系数时,饱和渗透系数越大,潜蚀对入渗和边坡稳定性的影响越显著;进气值越小,潜蚀作用对入渗和边坡稳定性的影响越显著。
[Abstract]:Under the effect of rainfall infiltration, the fine particles in the soil slope will move with the seepage to produce the latent erosion. Based on the simultaneous particle transport equation and unsaturated soil seepage equation, combined with the hydraulic characteristic equation of unsaturated soil and the constitutive relation of soil underlying erosion, the slope stability analysis model of seepage latent erosion coupling is established. The interaction between subsurface erosion and infiltration under rainfall infiltration is simulated by finite element method, and the effects of initial saturation permeability coefficient and inlet air value parameters on infiltration and slope stability are analyzed. The results show that the subsurface erosion mainly occurs in shallow soil within the range of the wetting front, which accelerates the downward velocity of the wetting front and further reduces the slope stability, the saturation permeability coefficient and the intake value are the main factors affecting the seepage potential erosion. When the rainfall infiltration intensity is greater than the saturation permeability coefficient, the larger the saturation permeability coefficient, the more significant the influence of the latent erosion on the infiltration and slope stability, and the smaller the intake value, the more significant the effect of the latent erosion on the infiltration and slope stability.
【作者单位】：上海交通大学海洋工程国家重点实验室;上海交通大学土木工程系;
【基金】：国家自然科学基金项目(41172252) 上海市青年科技启明星计划(12QA1401800) 中组部青年拔尖人才计划项目
【分类号】：TU432

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