岩土工程学报2025，Vol.47Issue(2)：255-264,10.DOI:10.11779/CJGE20230996
考虑过渡层多层空间变异性的边坡降雨入渗模型及稳定性分析应用
Rainfall infiltration model considering spatial variability of multiple layers in transition layer and its application in slope stability analysis
摘要
Abstract
Establishing a reasonable rainfall infiltration model is an important prerequisite for revealing the rainfall-induced slope failure mechanism and disaster prevention and control.The traditional Green-Ampt model does not consider the distribution of soil stratification and transition layer formed by rainwater infiltration.This results in a large deviation on the calculated infiltration rate.Thus,the traditional model is difficult to apply to the spatially varying slopes.A method is proposed for calculating the infiltration rate of an arbitrary soil layer.The thickness of transition layer is estimated based on the relationship among the infiltration rates underlying different soil layers.Based on this,an improved Green-Ampt model is proposed to analyze the rainfall infiltration process in the slope considering the spatial variability of saturated hydraulic conductivity of soil.The improved Green-Ampt model is further applied to an infinite slope to analyze its seepage and stability for both homogeneous and heterogeneous soils under the rainfall infiltration.The results obtained from the improved model are systematically compared with those obtained from a traditional Green-Ampt model and the numerical solutions of Richards equation.The results indicate that the distribution of water content and factor of stability calculated from the proposed improved model are more consistent with the numerical solutions of Richards equation than those of the traditional Green-Ampt model.The proposed improved model can lay a solid theoretical foundation for analyzing the rainfall infiltration processes in the heterogeneous slopes,and formulating effective measures for the prevention and control of rainfall-induced landslide disasters.Additionally,it is found that there is a dependence between the thickness of transition layer and the saturated hydraulic conductivity as well as the infiltration rate and volumetric water content at its top,while it is not directly related to the total depth of rainwater infiltration.关键词
边坡稳定性分析/空间变异性/降雨入渗/改进Green-Ampt模型/过渡层Key words
slope stability analysis/spatial variability/rainfall infiltration/improved Green-Ampt model/transition layer分类
建筑与水利引用本文复制引用
蒋水华,元志镕,刘贤,黄劲松,周创兵..考虑过渡层多层空间变异性的边坡降雨入渗模型及稳定性分析应用[J].岩土工程学报,2025,47(2):255-264,10.基金项目
国家自然科学基金优秀青年基金项目(52222905) （52222905）
国家自然科学基金项目(52179103,42272326) （52179103,42272326）
江西省自然科学基金项目(20242BAB24001,20232ACB204031) （20242BAB24001,20232ACB204031）
