中文核心期刊
CSCD来源期刊
中国科技核心期刊
RCCSE中国核心学术期刊

Journal of Chongqing Jiaotong University(Natural Science) ›› 2013, Vol. 32 ›› Issue (1): 63-67.DOI: 10.3969/j.issn.1674-0696.2013.01.15

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Characteristics Study on Moisture Migration in Soil Slope under Rainfall

Wen Guangju1,Deng Wenjie2,Liao Peiwei1   

  1. 1.Institute of Geotechnical Engineering,Chongqing Jiaotong University,Chongqing 400074,China; 2.School of River & Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China
  • Received:2012-05-29 Revised:2012-09-24 Online:2013-02-15 Published:2015-03-12

降雨作用下土质边坡水分迁移特征研究

文光菊1,邓文杰2,廖培伟1   

  1. 1.重庆交通大学岩土工程研究所,重庆400074;2.重庆交通大学河海学院,重庆400074
  • 作者简介:文光菊(1987—),女,重庆合川人,硕士研究生,主要从事岩土工程方面的研究。E-mail:wwgj87@163.com。
  • 基金资助:
    国家自然科学基金项目( 41071017) ; 重庆交通大学研究生教育创新基金资助项目〔2011( 上) 第02 号〕

Abstract: Based on the feature of slope failure induced by rainfall,from the point of view of moisture migration and combining unsaturated soil mechanics,the characteristics of moisture migration in slope under different rainfall intensities were analyzed by finite element method. The results reveal that under rainfall,the pore water pressure in slope is distributed in layer: the pore water pressure at the bottom is the highest,the lower at the top and the lowest at the middle. The moisture migrates mainly along in vertical and tilt direction. The migration velocity decreases from the surface to the deep,and the migration direction also changes with depth and time. The volumetric water content is nonlinear distributed and the degree of nonlinear in unsaturated area is higher than that of the saturated area. The permeability coefficient of soil rises with the increase of rainfall intensity,and when the soil is saturated,its permeability coefficient is saturate permeability coefficient.

Key words: slope failure, moisture migration, unsaturated soil mechanics, rainfall, numerical simulation

摘要: 针对降雨诱发边坡失稳的特点,从水分迁移的角度出发,结合非饱和土力学,采用有限元法分析了不同降雨强 度作用下边坡内部水分迁移的特征; 通过数值模拟得到: 降雨作用下,边坡内部孔隙水压力呈层状分布,坡脚处孔隙 水压力最大,坡顶次之,坡中最小; 边坡中的水分主要沿垂直和倾斜方向迁移,迁移速度由表层向深部逐渐减小,迁 移方向也随深度和时间而改变; 体积含水率呈非线性分布,且非饱和区非线性化程度较饱和区的高; 土体渗透系数 随降雨强度的增大而增大,当土体饱和时其渗透系数为饱和渗透系数。

关键词: 边坡失稳, 水分迁移, 非饱和土力学, 降雨, 数值模拟

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