| 降雨作用下土质边坡水分迁移特征研究 |
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| 引用本文： | 文光菊,邓文杰,廖培伟.降雨作用下土质边坡水分迁移特征研究[J].重庆交通大学学报(自然科学版),2013,32(1):63-67,74. |
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| 作者姓名： | 文光菊 邓文杰 廖培伟 |
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| 作者单位： | 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 |
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| 基金项目： | 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〕 |
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| 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。
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| 关 键 词： | 边坡失稳 水分迁移 非饱和土力学 降雨 数值模拟 |
Characteristics Study on Moisture Migration in Soil Slope under Rainfall |
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| Wen Guangju
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Deng Wenjie
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Liao Peiwei.Characteristics Study on Moisture Migration in Soil Slope under Rainfall[J].Journal of Chongqing Jiaotong University,2013,32(1):63-67,74. |
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| Authors: | Wen Guangju Deng Wenjie Liao Peiwei |
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| Institution: | 1(1.Institute of Geotechnical Engineering,Chongqing Jiaotong University,Chongqing 400074,China;2.School of River & Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China) |
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| 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. |
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| Keywords: | slope failure moisture migration unsaturated soil mechanics rainfall numerical simulation |
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