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| 降雨-蒸发作用下膨胀土边坡的非饱和渗流分析 | |
| 引用本文： | 韦杰,曹雪山,袁俊平.降雨-蒸发作用下膨胀土边坡的非饱和渗流分析[J].扬州大学学报(自然科学版),2010,13(1). |
| 作者姓名： | 韦杰 曹雪山 袁俊平 |
| 作者单位： | 1. 河海大学岩土工程研究所,南京210098;江苏省建苑岩土丁程勘测有限公司,南京210029 2. 河海大学土木交通学院,南京,210098 3. 河海大学岩土工程研究所,南京,210098 |
| 基金项目： | 国家"十一"五科技支撑计划项目，江苏省交通科学研究计划项目 |
| 摘 要： | 针对非饱和膨胀土边坡问题,考虑降雨、地表水入渗、地下水径流、地表蒸发、植被蒸腾等因素的作用,运用二维非饱和渗流模型求解不同气候条件下膨胀土边坡孔压、体积含水量的变化情况,通过分析得到如下结论:①持续降雨后,坡体内吸力减小,其中坡脚处的孔压最先达到正值,其次是坡中,最后是坡顶,因此持续降雨可扩大饱和区的范围,使边坡安全度降低;②坡脚、坡中及坡顶处体积含水量的差异除与土体孔压相关外,还与土体的水分特征曲线参数相关;③降雨-蒸发的干湿循环促使膨胀土滑坡内部土体的孔压、含水量的变化,从而形成裂隙,减小强度,降低边坡的安全度. |
| 关 键 词： | 降雨 蒸发 膨胀土边坡 二维渗流场 干湿循环 |
Unsaturated vadose study of expansive soil slope due to precipitation and evaporation |
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| WEI Jiea,CAO Xue-shanb,YUAN Jun-pinga.Unsaturated vadose study of expansive soil slope due to precipitation and evaporation[J].Journal of Yangzhou University(Natural Science Edition),2010,13(1). | |
| Authors: | WEI Jiea CAO Xue-shanb YUAN Jun-pinga |
| Institution: | WEI Jie1a,2*,CAO Xue-shan1b,YUAN Jun-ping1a(1a.Inst of Geotech Engin,1b.Civil & Traffic Coll,Hohai Univ,Nanjing 210098,China,2.Jiangsu Prov Geotech Surv Inst of Jianyuan Co,Ltd,Nanjing 210029,China) |
| Abstract: | The vadose fields and failure problems of unsaturated expansive soil slope are discussed in this paper by numerical analysis with improved two-dimensional Richards seepage model to analyze the variations of pore pressure and water content in the slope under different climate conditions,considering the action of rainfall precipitation and runoff as well as the evaporation by ground and vegetation.The results of the calculation and analysis can be described as follows: The suction in the slope decreases after... |
| Keywords: | precipitation evaporation slope of expansive soil two-dimensional vadose study drying-wetting cycling |
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