岩土工程学报2016，Vol.38Issue(z2)：216-221,6.DOI:10.11779/CJGE2016S2035
全风化泥岩持水特性研究及其预测
Water retention behaviour of complete-intense weathering mudstone and its prediction
摘要
Abstract
The pressure plate method, filter paper method, vapor equilibrium technique with saturated salt solution, transient water release and imbibition method and mercury intrusion porosimetry (MIP) tests are used to investigate the water retention behaviour and pore-size distribution of compacted complete-intense weathering mudstone specimens taken from Cenxi, Guangxi Province. Based on the results of the MIP tests experiencing two different suctions, a method for predicting the water retention curve is proposed. The test results show that the air entry value of complete-intense weathering mudstone is about 75 kPa, and the water retention curve in the full suction range can be measured by the three methods. There appears a plateau stage in SWCC. The SWCC calculated by TRIM matches the results of conventional tests. The saturated specimen exhibits a unimodal pore-size distribution, and the specimen experiencing suction of 38 MPa has a double-porosity microstructure. There are mainly intergranular pores with diameter of 102 nm to 103 nm in compacted samples of complete-intense weathering mudstone. With the increase of the suction, the pores in this diameter range decrease. The SWCCs fitted by Van Genuchte and Fredlund & Xing are more close to the measured results accurately, and those fitted by other models cannot match the measured water retention curve correctly in the full suction range.关键词
土水特征曲线/全风化泥岩/TRIM/模型拟合/压汞试验Key words
soil-water characteristic curve/complete-intense weathering mudstone/TRIM/model fitting/mercury intrusion porosimetry分类
建筑与水利引用本文复制引用
牛庚,孙德安,韦昌富,颜荣涛,何锦堂,于明波..全风化泥岩持水特性研究及其预测[J].岩土工程学报,2016,38(z2):216-221,6.基金项目
国家自然科学基金项目（11372078，51309055）；广西自然科学基金创新研究团队项目（2012GXNSFGA060001）；广西岩土力学与工程重点实验室开放基金项目 （）
