降雨条件下粗粒土高路堤渗流特性

发布时间：2018-03-10 10:04

本文选题：道路工程　切入点：孔隙水压力　出处：《中南大学学报(自然科学版)》2014年01期 　论文类型：期刊论文

【摘要】：为了分析降雨条件下粗粒土高路堤的渗流特性,基于饱和-非饱和渗流理论,结合室内试验渗透系数数据与实际气候条件,对算例边坡在设计降雨方案条件下孔隙水压力、体积含水率以及暂态饱和区的变化规律进行研究。研究结果表明:在降雨过程中,一定深度内的边坡表层孔隙水压力与体积含水率逐渐增大;降雨停止后,孔隙水压力与体积含水率才开始沿着坡面向下逐渐恢复到初始状态;当降雨持续5 h时,路堤边坡表层及坡脚水平面会形成一定范围的暂态饱和区;降雨停止4 h后,暂态饱和区面积达到最大值374.5 m2;随着时间持续,暂态饱和区沿路堤边坡坡面迅速消散,暂态饱和区的形成与消散均表现出明显滞后特点;暂态饱和区的扩展深度与降雨时间呈正比例关系;在整个降雨过程中,雨水入渗对路面以下地下水位线影响有限。
[Abstract]:In order to analyze the percolation characteristics of coarse grained high embankment under rainfall, based on the theory of saturated-unsaturated seepage, combined with the experimental data of permeability coefficient and the actual climatic conditions, the pore water pressure of slope under the design of rainfall scheme was calculated. The changes of volume water content and transient saturated zone are studied. The results show that the pore water pressure and volume water content in the surface layer of slope gradually increase during the rainfall process, and after the rainfall stops, the surface pore water pressure and volume water content of the slope are gradually increased. The pore water pressure and volume water content began to recover to the initial state gradually along the slope, when the rainfall lasted for 5 hours, a certain range of transient saturation areas would be formed in the surface layer of embankment slope and the water level at the foot of the slope, and after the rainfall stopped for 4 hours, The area of the transient saturated zone reaches the maximum value of 374.5 m2. With the duration of time, the slope surface of the transient saturated area along the embankment slope dissipates rapidly, and the formation and dissipation of the transient saturated zone show obvious lag characteristics. The expansion depth of transient saturated area is proportional to the rainfall time, and Rain Water infiltration has limited influence on the underground water level below the road surface during the whole rainfall process.
【作者单位】：长沙理工大学特殊环境道路工程湖南省重点实验室;长沙理工大学交通运输工程学院;
【基金】：国家自然科学基金资助项目(51108408) 湖南省自然科学基金资助项目(12JJ6052) 湖南省教育厅一般项目(12JJ6052) 特殊环境道路工程湖南省重点实验室开放基金资助项目(kfj120402) 广西科学研究与技术开发计划项目(桂科转1298011-2)
【分类号】：U416.12

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