脱湿速率对膨胀土堑坡稳定性的影响分析

徐锴; 耿之周; 李雄威

doi:10.11779/CJGE2017S1026

脱湿速率对膨胀土堑坡稳定性的影响分析 English Version

1. 南京水利科学研究院岩土工程研究所,江苏南京 210024;
2. 常州工学院,江苏常州 213002

基金项目: 水利部公益性行业科研专项经费项目（201401006）; 水利部公益性行业科研专项经费项目（201501043）; 国家自然科学基金项目（51408381）

详细信息

作者简介:
徐锴(1982-),男,博士,主要从事软土地基处理、淤泥固化以及环境土工等方面的研究。E-mail:kxu@nhri.cn。

通讯作者:
耿之周，E-mail：zzgeng@nhri.cn

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出版历程
- 收稿日期: 2016-11-27
- 发布日期: 2017-11-19

Influence of different drying rates on stability of cut slope of expansive soils

1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China;
2. Changzhou Institute of Technology, Changzhou 213002, China

摘要

摘要: 以广西南宁膨胀土为研究对象,设置不同温湿度条件引起的脱湿环境,测试不同脱湿速率作用下,膨胀土的收缩特性以及持水能力,预测不同脱湿速率作用下非饱和土体渗透曲线,并对膨胀土边坡雨水入渗过程进行数值模拟计算。试验结果表明,脱湿速率越小,膨胀土收缩变形越大,这说明自然条件下湿度大的气候里,经过缓慢蒸发,表层土体的膨胀潜势会较大。数值计算结果表明,脱湿速率较小时,降雨后边坡雨水入渗的影响深度较大,这说明,湿度大的气候条件下,长期的蒸发过程,会导致更大的降雨入渗深度,从而不利于膨胀土边坡的稳定。
- 膨胀土 /
- 堑坡 /
- 脱湿 /
- 土水特征曲线 /
- 非饱和渗透系数曲线
Abstract: For the expansive soils of Nanning in Guangxi province of China different drying environments are acquired to test the shrinking characteristics and water retention by setting different temperature and humidity conditions. The unsaturated permeability curves under different drying rate are predicted. The infiltrating process of cut slope is numerically simulated. The test results show that the slow drying rate produce a large shrinking deformation. The sustainable evaporation with high humidity results in a large potential swelling deformation in shallow strata. The numerical computation indicates that an evaporation process of slow drying rate produces a large infiltration depth. It is concluded that the sustainable evaporation with high humidity induces a large infiltration depth, which is adverse to the stability of cut slope of expansive soils.
- expansive soil /
- cut slope /
- drying /
- SWCC /
- unsaturated permeability curve

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参考文献(9)

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