降雨入渗参数对粗粒土路堤暂态饱和区影响的数值模拟

发布时间：2018-03-04 11:45

  本文选题：道路工程　切入点：暂态饱和区　出处：《河海大学学报(自然科学版)》2014年03期 　论文类型：期刊论文

【摘要】：为探讨降雨入渗条件下粗粒土路堤边坡暂态饱和区的形成条件,分析降雨入渗参数对暂态饱和区发展规律的影响,基于室内外试验数据与实际气象数据,拟定不同的数值计算方案,采用降雨入渗理论对降雨入渗参数影响下粗粒土路堤边坡雨水入渗过程进行数值模拟。结果表明:降雨强度q与饱和渗透系数ksat的比值是决定路堤内雨水入渗方式及暂态饱和区形成的关键因素,当q/ksat≥1.5时,路堤边坡表面及坡脚水平面将形成一定深度的暂态饱和区,暂态饱和区的形成增大了路堤发生失稳的可能;降雨入渗仅会引起路堤边坡坡面以下水位大幅度上升,对路面中部以下地下水位影响有限;路堤边坡暂态饱和区的扩展速度主要取决于q与ksat的大小,而暂态饱和区形成的时间与扩展面积则受到降雨强度、降雨历时与饱和含水率的共同影响。
[Abstract]:In order to investigate the formation conditions of transient saturated area of coarse grained soil embankment slope under rainfall infiltration, and to analyze the influence of rainfall infiltration parameters on the development of transient saturated zone, the indoor and outdoor test data and actual meteorological data are used to analyze the influence of rainfall infiltration parameters on the development of transient saturated zone. Develop different numerical calculation schemes, The infiltration process of coarse grained soil embankment slope Rain Water under the influence of rainfall infiltration parameters is numerically simulated by using rainfall infiltration theory. The results show that the ratio of rainfall intensity Q and saturated permeability coefficient ksat is the determining factor of Rain Water infiltration in embankment. And the key factors in the formation of transient saturation region, When Q / Ksat 鈮，

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