水利水电技术（中英文）2025，Vol.56Issue(9)：222-235,14.DOI:10.13928/j.cnki.wrahe.2025.09.017
基于改进Green-Ampt模型的降雨入渗条件下均质土坡稳定性分析
Stability analysis of homogeneous soil slopes under rainfall infiltration conditions based on an improved Green-Ampt model
摘要
Abstract
[Purpose]Rainfall infiltration has a great influence on the stability analysis of slopes,and the Green-Ampt model is commonly used in the analysis of rainfall infiltration problems,but some of its assumption conditions are quite different from the actual situation.In order to get more realistic calculation result,[Methods]made some improvements on the basis of the Green-Ampt model:under the condition of stable rainfall intensity,based on the stratification assumption,the wetted area is divided into a saturated zone,transition zone and initial zone,and at the same time,the slope seepage effect of the saturated zone of the finite-length side slope is considered,and the assumption that the rainfall in the early stage of infiltration completely seeps into the soil body is made by taking the chalky soil as an example.The two stages of infiltration(rainfall intensity control stage,and soil infiltration capacity control stage)are analysed separately,and the infiltration coefficient is corrected to obtain the infiltration depth change rule curve with time,which is called the PSGA model.Improved PSGA infiltration model for slope stability analysis,here consider rainfall infiltration area are above the water table,and respectively selected wetting front,saturated zone-unsaturated zone interface as a dangerous sliding surface for calculation,take the smaller value to the slope safety coefficient with infiltration time.Finally,the PSGA model was used to analyse the rainfall infiltration and stability of the Zhangjiawan landslide.[Results]The result show that:from the error analysis,it can be seen that the calculation result of the PSGA model are more accurate compared with the GA,SGA,and MSGA models;according to the slope stability analysis:the GA model reaches the critical safety coefficient at the earliest time(2.71 h),followed by the PSGA model(4.74 h),and lastly,the PSGA model(6.27 h);the stability analysis of Zhangjiawan landslide:compared with the SGA model,the PSGA model is more accurate than the SGA model,the PSGA model is more accurate than the SGA model,and the stability analysis is more accurate than the SGA model.SGA model,and PSGA model calculation result are closer to the actual situation.[Conclusion]The result show that:the calculation accuracy of the PSGA model is higher and more in line with the actual situation;the critical destabilisation time obtained by the PSGA infiltration model is longer than that of the traditional GA infiltration model and shorter than that of the SGA infiltration model;the seepage effect of the saturated zone of the slope has a greater influence on the depth of the wetting front when the length of the slope is smaller;and the analysis of Zhangjiawan landslide by PSGA model verifies the reasonableness of this model.关键词
降雨入渗/PSGA模型/渗流/边坡稳定性/临界失稳Key words
rainfall infiltration/PSGA model/seepage/slope stability/critical instability分类
建筑与水利引用本文复制引用
林锋,任伟中,魏潇阳..基于改进Green-Ampt模型的降雨入渗条件下均质土坡稳定性分析[J].水利水电技术（中英文）,2025,56(9):222-235,14.基金项目
国家重点研发计划资助项目(2021YFC1523400) （2021YFC1523400）
