Infiltration,runoff,and slope stability behaviors of infinite slope with macropores based on an improved Green–Ampt model  

作　　者：LI Shanghui WU Guoxiong QUE Yun JIANG Zhenliang CHENG Gaoyun 

机构地区：[1]College of Intelligent Construction,Fuzhou University of International Studies and Trade,Fuzhou 350202,China [2]College of Civil Engineering,Chongqing Jiao Tong University,Chongqing 400074,China [3]Chongqing Vocational College of Architectural Engineering,Chongqing 400072,China [4]College of Civil Engineering,Fuzhou University,Fuzhou 350000,China [5]Department of Civil and Environmental Engineering,Hong Kong University of Science and Technology,Hong Kong 999077,China [6]T.Y.Lin International Engineering Consulting(China)Co.Ltd,Chongqing 401120,China

出　　处：《Journal of Mountain Science》2024年第7期2220-2235,共16页山地科学学报（英文）

基　　金：funded by the Natural Science Foundation of Fujian Province(Grant No.2023J011133)。

摘　　要：Infiltration–runoff–slope instability mechanism of macropore slope under heavy rainfall is unclear.This paper studied its instability mechanism with an improved Green–Ampt(GA)model considering the dual-porosity(i.e.,matrix and macropore)and ponding condition,and proposed the infiltration equations,infiltration–runoff coupled model,and safety factor calculation method.Results show that the infiltration processes of macropore slope can be divided into three stages,and the proposed model is rational by a comparative analysis.The wetting front depth of the traditional unsaturated slope is 17.2%larger than that of the macropore slope in the early rainfall stage and 27%smaller than that of the macropore slope in the late rainfall stage.Then,macropores benefit the slope stability in the early rainfall but not in the latter.Macropore flow does not occur initially but becomes pronounced with increasing rainfall duration.The equal depth of the wetting front in the two domains is regarded as the onset criteria of macropore flow.Parameter analysis shows that macropore flow is delayed by increasing proportion of macropore domain(ω_(f)),whereas promoted by increasing ratio of saturated permeability coefficients between the two domains(μ).The increasing trend of ponding depth is sharp at first and then grows slowly.Finally,when rainfall duration is less than 3 h,ωf andμhave no significant effect on the safety factor,whereas it decreases with increasingωf and increases with increasingμunder longer duration(≥3 h).With the increase ofω_(f),the slope maximum instability time advances by 10.5 h,and with the increase ofμ,the slope maximum instability time delays by 3.1 h.

关 键 词：Macropore slope Green–Ampt infiltration model Equivalent wetting front Ponding response time Slope stability 

分 类 号：TU43[建筑科学—岩土工程] P642.2[建筑科学—土工工程]