膨胀土自然边坡吸力和饱和度量测

膨胀土自然边坡吸力和饱和度量测 English Version

成都理工大学地质灾害防治国家专业实验室,成都理工大学地质灾害防治国家专业实验室,中科院地质与地球物理研究所,中科院地质与地球物理研究所,湖北省孝襄高速公路指挥部四川成都610059；中科院地质与地球物理研究所,北京100029,四川成都610059,北京100029,北京100029,湖北随州441300；

基金项目: 国家自然科学基金“西部生态与环境”重大研究计划(90102002);;中科院知识创新工程重要方向项目(KZCX3-SW-134);;973专题资助项目(2002CB412702)

1.National Laboratory of Geological Hazard Prevention and Geological Environment Protection Chengdu University of Technology Chengdu 610069 China 2.Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China 3. Headquarters of .Xiaoxiang Freeway in Hubei Province Suizhou 441300 China

摘要: 为查明非饱和膨胀土边坡中吸力和饱和度(体积含水量)的变化和规律,以及降雨对吸力和饱和度的影响。在湖北襄樊某高速公路旁的天然边坡设立观测井,并埋设热传导探头和含水量探头,进行了为期2 个月的观测。通过精度较高的多项式的拟合获得的土-水特征曲线,得出进气值和残余饱和度对应的基质吸力。根据土-水特征曲线,获得非饱和土的渗透系数,为工程设计提供了必要的参数,同时解释了非饱和膨胀土的吸力随深度变化的规律和原因。
- 非饱和膨胀土 /
- 基质吸力 /
- 饱和度 /
- 土-水特征曲线
Abstract: In order to study the variation of suction and saturation in natural slopes of unsaturated expansive soil and the rules of rainfall influencing suction and saturation, matrix suction and saturation in situ near a highway at Xiangfan in Hubei province were measured with thermal conductivity sensors and moisture probes for two months. Soil-water characteristic curve (SWCC) is obtained from the data measured in situ, from which we can acquire air entry value (AEV) and residual saturation (RS). Permeability coefficient is derived from SWCC. At the same time, reasons and rules of suction variation with depth are explained.
- unsaturated expansive soil /
- matrix suction /
- saturation /
- natural slope