岩土工程学报2024，Vol.46Issue(6)：1177-1186,10.DOI:10.11779/CJGE20230205
多层非均质边坡降雨入渗分析的改进Green-Ampt模型
An improved Green-Ampt model for rainfall infiltration analysis of multi-layered heterogeneous soil slopes
摘要
Abstract
The rainfall infiltration analysis of slopes is of a great significance to the reinforcement design,mitigation and risk mitigation of rainfall-induced landslides.The classical Green-Ampt model,whose parameters have clear physical meanings and which is easy to implement,ignores the fact that a transition layer objectively exists in infiltration zone.It cannot effectively analyze the rainfall infiltration process of multi-layered heterogeneous slopes considering the spatial variability of hydraulic conductivity.To this end,an improved Green-Ampt model is proposed for the rainfall infiltration analysis of multi-layered heterogeneous slopes,and it considers the elliptical transition layer of rainfall infiltration and evaluates the water content distributions under different rainfall durations.Additionally,an infinite slope model is taken as an example to validate the effectiveness of the proposed improved Green-Ampt model through four common slope scenarios.The corresponding slope stability analyses under rainfall infiltration are also conducted.The results indicate that the distributions of volumetric water content and the factors of safety evaluated using the proposed model are well consistent with the numerical results of Richards'equation for these four slope cases.In contrast,the modified Green-Ampt model produces the biased distributions of volumetric water content and smaller factors of safety.In addition,the location of the critical slip surface of the slope can be accurately identified using the proposed improved Green-Ampt model.The research outcome provides theoretical references for the rainfall infiltration analysis of multi-layered heterogeneous soil slopes and the reinforcement design and risk control of rainfall-induced landslides.关键词
非均质边坡/降雨入渗/稳定性分析/改进Green-Ampt模型/空间变异性Key words
heterogeneous slope/rainfall infiltration/stability analysis/improved Green-Ampt model/spatial variability分类
建筑与水利引用本文复制引用
蒋水华,刘贤,黄劲松,周创兵..多层非均质边坡降雨入渗分析的改进Green-Ampt模型[J].岩土工程学报,2024,46(6):1177-1186,10.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(5217910342272326) （5217910342272326）
江西省自然科学基金项目(20232ACB204031,20224ACB204019) （20232ACB204031,20224ACB204019）
