考虑非饱和浸润区的改进Green-Ampt模型  

An improved Green-Ampt model considering unsaturated infiltration zone

作　　者：李强 贾森[1,2] 李鑫 武璧泽 尚艳亮[3] 董俊 LI Qiang;JIA Sen;LI Xin;WU Bi-ze;SHANG Yan-liang;DONG Jun(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;Department of Railway Engineering,Shijiazhuang Institute of Railway Technology,Shijiazhuang,Hebei 050041,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan,Hubei 430063,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043 [3]石家庄铁路职业技术学院铁道工程系,河北石家庄050041 [4]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《岩土力学》2022年第12期3484-3492,3502,共10页Rock and Soil Mechanics

基　　金：河北省自然科学基金(No.E2019210304,No.E2021210092);河北省青年拔尖人才项目资助;河北省省级科技计划资助(No.22375412D)。

摘　　要：经典Green-Ampt入渗模型计算简单,广泛应用于土壤入渗问题的研究,但在湿润锋处理上采用明显的干湿分离界面,存在一定的理论假设。鉴于此,基于饱和区-非饱和浸润区分层模型,结合达西定律,推导出入渗过程中饱和区厚度与非饱和浸润区厚度关系的理论公式,提出了水分剖面理论模型,消除了饱和区厚度和浸润区厚度的关系假设。在此基础上,建立了考虑土壤水分剖面形状和非饱和浸润区等效参数的改进Green-Ampt模型,并采用试验和有限元数值仿真对该模型进行了验证,结果表明:该模型有很高的精度,对不同类型的土有很好的适应性。同时该模型求解简单,参数物理意义明确,便于工程应用。The classical Green-Ampt infiltration model is simple in calculation and widely used in the study of soil infiltration.However, there exist some certain theoretical assumptions for the obvious dry-wet separation interface in the treatment of wetting front in the model. In view of this, based on the layered model of saturated zone-unsaturated infiltration zone and combined with Darcy’s law, a theoretical formula of the thickness relationship between the saturated zone and the unsaturated infiltration zone during infiltration was deduced in this paper and a theoretical model of water profile was proposed, which can eliminate the traditional assumption of the thickness relationship between the saturated zone and the unsaturated infiltration zone. On the basis, an improved Green-Ampt model considering the shape of soil moisture profile and the equivalent parameters in the unsaturated infiltration was established. The model was verified by experiments and finite element numerical simulation. The results show that the model has high accuracy and good adaptability to different types of soil. Meanwhile, the model is simple to solve with clear physical meaning parameters, and is convenient for engineering application.

关 键 词：GREEN-AMPT模型 水分剖面模型 非饱和浸润区 入渗深度 非饱和渗流 

分 类 号：TU411[建筑科学—岩土工程]