前峰型降雨入渗过程双层地基基质吸力解析解  

Analytical Solution of Matric Suction for Advanced-Peak Pattern Rainfall Infiltration into a Two-Layered Foundation

作　　者：徐瑞麟 秦卫星[1,2,3] 何勇 胡惠仁 阳乐 王聪 熊轩宇 XU Ruilin;QIN Weixing;HE Yong;HU Huiren;YANG Le;WANG Cong;XIONG Xuanyu(International Institute of Technology,Changsha University of Science&Technology,Changsha 410114,China;School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410114,China;School of Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学国际工学院,湖南长沙410114 [2]长沙理工大学水利与环境工程学院,湖南长沙410114 [3]水沙科学与水灾害防治湖南省重点实验室,湖南长沙410114 [4]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《吉首大学学报（自然科学版）》2022年第3期57-65,83,共10页Journal of Jishou University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(51208062,51508039);湖南省交通科技计划资助项目(201140);国家级大学生创新创业训练计划项目(2021105360020)。

摘　　要：为揭示前峰型降雨入渗对双层地基基质吸力分布的影响,首先基于Richards瞬态非饱和渗流方程,引入Gardner土-水特征函数,建立了前峰型降雨入渗作用下双层非饱和地基水分运移模型,利用拉普拉斯变换推导了前峰型降雨过程双层地基基质吸力瞬态解析解;然后通过与有限单元模拟结果对比分析,验证了该解析解是正确的.研究成果为快速预测非均匀型降雨入渗作用下双层地基基质吸力演化特性提供了便捷手段,可为雨季地基承载性能评价和防灾减灾提供技术支持.In order to reveal the influence of advanced-peak rainfall infiltration on the matrix suction distribution of a two-layered foundation, the following research work is carried out.Firstly, based on Richards transient unsaturated seepage equation and Gardner soil water characteristic function, the water transport model of a two-layered unsaturated foundation for advanced-peak rainfall infiltration is established, and the transient analytical solution of matrix suction for advanced- peak pattern rainfall infiltration into a two-layered foundation is established by Laplace transform.Then, the analytical results are compared with those obtained from the finite element simulation, which indicates that the analytical solution is reasonable.The research results provide a convenient means to predict the evolution characteristics of matrix suction of a two- layered foundation for non-uniform rainfall infiltration, and can provide technical support for the evaluating bearing performance and reducing disaster of a foundation in rainy season.

关 键 词：非饱和土 双层地基 降雨入渗 基质吸力 解析解 

分 类 号：TU43[建筑科学—岩土工程]