基于改进的Green-Ampt入渗模型的炭质泥岩粗粒土路堤边坡稳定性分析  

Stability analysis of carbonaceous mudstone coarse-grained soil embankment slope based on improved Green-Ampt infiltration model

作　　者：何忠明[1] 钟魏 刘正夫 李奇[2] 舒青海 HE Zhongming;ZHONG Wei;LIU Zhengfu;LI Qi;SHU Qinghai(School of Traffic and Transportation on Engineering,Changsha University of Science&Technology,Changsha 410004,China;School of Architectural and Artistic Design,Changsha Vocational&Technical College,Changsha 410217,China;Kunming Air Drop Construction Management Co.Ltd.,Kunming 650000,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410004 [2]长沙职业技术学院建筑与艺术设计学院,湖南长沙410217 [3]昆明空投建设管理有限公司,云南昆明650000

出　　处：《中南大学学报（自然科学版）》2021年第7期2179-2187,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51978084);湖南省自然科学基金资助项目(2020JJ4605)长沙理工大学研究生科研创新项目(CX2020SS07)。

摘　　要：针对降雨入渗的实际情况,将湿润锋至边坡表面的区域分为饱和区和非饱和区,入渗分为降雨强度控制阶段和土体入渗能力控制阶段,根据饱和区和非饱和区的厚度对入渗量和渗透系数进行修正。基于达西定律和质量守恒,利用入渗量和入渗速率的微分关系,对Green-Ampt模型进行改进。将改进后的模型用于炭质泥岩粗粒土路堤边坡稳定分析,利用Geo-studio进行边坡降雨入渗模拟和边坡稳定性分析,并将改进的Green-Ampt模型计算理论结果与数值模拟结果进行对比。研究结果表明:在相同降雨时间内,由改进的Green-Ampt模型计算得到的湿润锋深度、湿润锋推进速率和边坡安全系数更接近数值模拟结果;由改进的Green-Ampt模型计算得到的边坡安全系数始终比由Green-Ampt模型计算得到的边坡安全系数高。Aiming at the actual situation of rainfall infiltration,the wet front was divided into saturated zone and unsaturated zone,and the infiltration was divided into rainfall intensity control stage and soil infiltration capacity control stage.According to the thickness of the saturated zone and the unsaturated zone,the infiltration volume and permeability coefficient were corrected.Based on Darcy's law and conservation of mass,the differential relationship between infiltration volume and infiltration rate was used to improve the Green-Ampt model.The improved theory was applied in the stability analysis of carbonaceous mudstone embankment slope,the Geostudio was used to analyse slope rainfall infiltration simulation and slope stability,and the theoretical results calculated by the improved Green-Ampt model were compared with the numerical simulation results.The results show that the wet front depth,wet front advancing rate and the slope safety factor calculated by the improved Green-Ampt model are close to those of numerical simulation in the same rainfall time.The slope safety factor calculated by the improved Green-Ampt model is always higher than that calculated by the Green-Ampt model.

关 键 词：湿润锋 边坡稳定性 改进Green-Ampt模型 数值模拟 

分 类 号：U416.14[交通运输工程—道路与铁道工程]