为提升海绵城市建设和运行过程中雨水的利用率,提出了一种雨水入渗渗井装置,并对雨水入渗效果进行了验证。在黏土场地竖向开挖一定深度的渗井孔,并用中粗砂填满,即形成一种雨水入渗装置。利用原位试验对渗井场地中土体的渗流情况进行了测定,得到了入渗过程中不同时刻土体的饱和度。依据数值分析软件ABAQUS对原始黏土场地和设有砂石渗井的黏土场地分别进行了数值模拟,获取了入渗过程中不同时刻土体的饱和度模拟值。将原始场地的饱和度模拟值和设有砂石渗井场地的饱和度模拟值进行了比较,并将在设置渗井的场地进行的原位试验得到的饱和度实测值与ABAQUS计算出的饱和度模拟值进行了对比。研究结果表明:砂石渗井能大幅增加土体的入渗量,且靠近渗井的土体水分入渗量较原始场地平均增长率达到了67.21%;砂石渗井增加入渗的效果随土体深度和距渗井轴心距离的降低而增加。该研究成果期望为海绵城市的建设提供参考。
Abstract
In the aim of improving the utilization rate of rainwater in the construction and operation of sponge city, a rainwater infiltration device was proposed and its effect on increasing infiltration was verified. The rainwater infiltration device was formed via digging an infiltration well in clayey soil ground and filling the well with coarse sand. The seepage in the infiltration well was measured through in-situ test device, and the saturation degree of soil at different times during infiltration was obtained. In the meantime, the original clay site and the clay ground equipped with sand well were simulated in ABAQUS, which provided us the simulated values of saturation degree of soil at different instances in the process of infiltration. Moreover, the test values and simulation values were compared, and the simulated values between original clay site and clay site equipped with infiltration well were further compared. Results demonstrated that sand infiltration well could augment the infiltration capacity of soil by a large margin, and the average growth rate of water infiltration of soil near the infiltration well reached 67.21%. In addition, the effect of infiltration was increased along with the decrease of depth and the distance from the axis of infiltration well.
关键词
海绵城市 /
雨水入渗装置 /
封闭孔隙 /
原位试验 /
渗井 /
渗流场
Key words
sponge city /
rainwater infiltration device /
closed pores /
in-situ tests /
infiltration well /
seepage field
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基金
国家自然科学基金项目(41472253);天津市自然科学基金重点项目(16JCZDJC39000);天津市建设系统科学技术项目发展计划项目(2016-25);天津市建设工程技术研究所2017年财政资金项目(JGY18-01)
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