岩土工程学报2017，Vol.39Issue(9)：1645-1652,8.DOI:10.11779/CJGE201709012
表面张力与接触角对膨胀土干缩开裂影响的试验研究
Effects of pore water surface tension and contact angle on dry-shrinkage cracking of expansive soils
摘要
Abstract
The surface tensions of water, alcoholic solution and suds (surfactant) are measured by using the pendent drop method, and then their values are compared. The contact angle of soil samples is measured by means of the sessile drop method, and the samples are mixed with octadecylamine. Based on the results, the tests on dry-shrinkage cracking are conducted on expansive soil samples with different pore water surface tensions and contact angles. The results indicate that the surface tension and contact angle have a major impact on the dry-shrinkage cracking of expansive soils. The soil samples with a less surface tension have a less final crack ratio. In the phase of cracking development, the samples with a lower surface tension have a higher crack ratio during the same amount of drying time. Increasing the contact angle of soil particles and pore water can hold back the dry-shrinkage cracking in expansive soils. For the soil samples during the same drying time, a larger contact angle will cause a smaller crack ratio. Both decreasing the surface tension and increasing the contact angle lead to the increase of the radius of curvature in pore fluid, and the matric suction thus decreases. Meniscus may become convex because of the larger contact angle, and the matric suction will disappear in this situation.关键词
悬滴法/躺滴法/表面张力/接触角/干缩开裂Key words
pendent drop method/sessile drop method/surface tension/contact angle/dry-shrinkage cracking分类
建筑与水利引用本文复制引用
杨松,吴珺华,黄剑峰..表面张力与接触角对膨胀土干缩开裂影响的试验研究[J].岩土工程学报,2017,39(9):1645-1652,8.基金项目
国家自然科学基金项目(41662021,51209182,51408291) （41662021,51209182,51408291）
