考虑非饱和与各向异性影响的土体加速入渗渗井优化布置  

Optimal Layout of Infiltration Wells Considering Unsaturated and Anisotropic Influences on Accelerated Infiltration in Soils

作　　者：刘立洋 李顺群[1] 肖明睿 王志昊 LIU Liyang;LI Shunqun;XIAO Mingrui;WANG Zhihao(Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,TCU,Tianjin 300384,China;Department of Engineering Mechanics,Dalian University of Technology,Dalian 100024,China)

机构地区：[1]天津城建大学天津市软土特性与工程环境重点实验室,天津300384 [2]大连理工大学工程力学系,大连100024

出　　处：《天津城建大学学报》2025年第1期8-14,共7页Journal of Tianjin Chengjian University

基　　金：国家自然科学基金(41877251);天津市重点研发计划(19YFZCSF00820)。

摘　　要：土体加速入渗技术是拓展海绵城市建设方法的重要技术,利用高孔隙、大渗透系数和土体各向异性等特点的中粗砂渗井能够显著提升雨水的入渗速率.为分析土体入渗过程并找寻非饱和土场地砂石渗井的最优布置设计规律,考虑土体的非饱和特性及土中不同方向渗透系数的各向异性,对土体的加速入渗过程进行了模型研究.研究结果表明:土体的雨水入渗过程是瞬态过程,获取的水分场与时间相关;考虑土体存在的各向异性特性,获取的水分场更能体现出竖向渗透通道对雨水加速入渗的影响;渗井与土层的接触面是影响渗井加速入渗效果的最重要因素,渗井建设过程中优先采用直径较小的渗井;从使用效果上来看,渗井的设置深度不宜超过地下水位.Accelerated soil infiltration technology is an important technology to expand the construction method of Sponge City.The medium-coarse sand in filtration well with the characteristics of high porosity,large permeability coefficient,and soil anisotropy can greatly improve the infiltration rate of rainwater.In order to analyze the infiltration process of soil and find the optimized layout of sand and gravel infiltration wells in unsaturated soil sites,considering the unsaturated characteristics of soil and the anisotropy of permeability coefficient in different directions in soil,the authors conducted a model study of the accelerated infiltration process of soil.The results show that the rainwater infiltration process of soil is a transient process,and the obtained moisture field is time-dependent.In view of the anisotropic characteristics of the soil,the obtained water field can better reflect the influence of vertical infiltration channels on the accelerated infiltration of rainwater.The contact surface between the infiltration well and the soil layer is the most important factor affecting the accelerated infiltration effect of the percolation well,and the percolation well with smaller diameter is preferred in the construction process of the infiltration well.From the application effect,the depth of the percolation well should not exceed the groundwater level.

关 键 词：海绵城市 非饱和土 渗井 优化布置 导水系数 

分 类 号：TU43[建筑科学—岩土工程]