非饱和高液限土土-水特性试验研究  

Experiments on Soil Water Characteristics of Unsaturated High Liquid Limit Soil

作　　者：陈永辉[1,2] 李秉宜 孔庆东[1,2] 赵泽涛 夏波 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学岩土工程科学研究所,江苏南京210098 [3]金华市金义市新区管委会,浙江金义321037

出　　处：《水利与建筑工程学报》2017年第5期1-5,11,共6页Journal of Water Resources and Architectural Engineering

基　　金：中央高校基本费项目(2016B43314);浙江省交通运输厅科技计划项目(2015J06)

摘　　要：为研究非饱和高液限土土-水特性及其不同条件下土-水特性试验的适用性,分别采用滤纸法、非饱和土固结仪法和现场试验法对公路边坡工程中非饱和高液限土进行测量土-水特征曲线的试验研究。结果表明:滤纸法测得的土-水特征曲线与室内方法存在差距,大部分在室内测得土-水特征曲线的回滞圈内,对曲线进行拟合得到含水率与基质吸力对数呈线性关系;室内非饱和土固结仪法试验得到的土-水特征曲线出现滞回效应,曲线利用VG模型可较好地拟合;现场监测得到的土-水特征曲线(SWCC)与室内试验方法的结果存在差距,但大部分在吸湿曲线和脱湿曲线之间,更接近吸湿曲线,曲线受土体上覆应力影响,上覆应力越大曲线越陡,且基质吸力与含水率成负相关,二者不存在滞后现象,曲线可利用线性函数较好地拟合。To acquire the unsaturated soil water characteristics of high liquid limit and its applicability of soil water characteristic test under different conditions,the soil water characteristic curve of unsaturated high liquid limit soil in highway slope engineering was tested by filter paper method,unsaturated soil consolidation method and field test method. The results show that there is a gap between the soil water characteristic curve measured by filter paper method and interior method,most in hysteresis circle of water characteristic curve of soil measured indoor and the fitting curves showed a linear relationship with the water content and matrix suction in logarithm; Soil water characteristic curve obtained from indoor unsaturated soil consolidation test instrument appeared hysteresis effect,which can be better fitting by using the VG curve model; Soil water characteristic curve（ SWCC） monitoring data from outdoor exists a gap with the experiment results,but most are between the moisture absorption curve and desorption curves,and closer to the moisture absorption curve,which can be influenced by soil overburden stress,the greater overburden stress,the steeper the curve,and the matrix suction and water content was negatively correlated,there is not hysteresis between the curves,also the curves can be fitted well by a linear function.

关 键 词：高液限土 非饱和土 土-水特征曲线 基质吸力 含水率 

分 类 号：TU43[建筑科学—岩土工程]