脱湿路径下土体水分变化路径及体积变形对滤纸法测定土-水特征曲线的影响  

Influence of water change path and volume change in soil on soil-water characteristic curve measured by filter paper method under drying path

作　　者：叶云雪 易博文 刘小文[2] 吴珺华[1] 洪本根 YE Yun-xue;YI Bo-wen;LIU Xiao-wen;WU Jun-hua;HONG Ben-gen(College of Civil Engineering and Architecture,Nanchang Hangkong University,Nanchang,Jiangxi 330063,China;School of Infrastructure Engineering,Nanchang University,Nanchang,Jiangxi 330031,China;Longyan Rare Earth Development Co.,Ltd.,Longyan,Fujian 364000,China)

机构地区：[1]南昌航空大学土木建筑学院,江西南昌330063 [2]南昌大学工程建设学院,江西南昌330031 [3]龙岩市稀土开发有限公司,福建龙岩364000

出　　处：《岩土力学》2024年第8期2351-2361,共11页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51268046,No.51869013);江西省教育厅科学技术研究项目(No.GJJ210920)。

摘　　要：尽管滤纸法已被广泛应用于非饱和土-土水特性研究,但滤纸法试验数据与压力板试验数据始终存在无法连续、光滑连接的问题。为此,以收缩变形不同的两类土为研究对象,从试样水分变化路径和体积变形两个方面着手,分别开展了一系列室内压力板试验、滤纸法试验和土的收缩试验,并基于土-水特征曲线(soil-water characteristic curve,SWCC)试验结果,进行统计指标的量化分析。研究结果表明,饱和脱湿路径下的滤纸法与压力板法联合测定的SWCC试验数据能够有效地连接,而无水分变化路径下的滤纸法与压力板法各自测定的SWCC试验数据在连接时可能会错开或交叉,尤其是变形显著的土体;为了较准确地估算基于饱和度的SWCC,提出一个简单的改进法,仅需补充土的收缩试验;针对不同滤纸法试验结果呈现的差异性,给出了合理的解释。该研究结果不仅能为试验人员在同时处理滤纸法和压力板法试验数据时提供重要的理论指导,还能拓展滤纸法的适用范围。Although the filter paper method has been widely used in the study of soil-water characteristics of unsaturated soil,the test data of the filter paper method and the pressure plate test data are always not continuous and smooth.For this reason,a series of indoor pressure plate tests,filter paper tests and soil shrinkage tests were carried out based on the water change path and volume change of the samples,and quantitative analysis of statistical indicators was conducted based on the test results of the soil water characteristic curve(SWCC).The research results show that the SWCC test data measured by the filter paper method and the pressure plate method along the drying path from saturation can be effectively connected,while the SWCC test data measured by these methods along the path without water change may be staggered or crossed during the connection,especially for the soil with significant deformation.In this paper,an improved method is proposed so as to accurately estimate the SWCC based on degree of saturation,which the soil shrinkage test is only required to supplement.A reasonable explanation is given for the differences in the performance of different filter paper method test results.The research results can not only provide important theoretical guidance for the test personnel when they deal with the test data of filter paper method and pressure plate method simultaneously,but also expand the application scope of filter paper method.

关 键 词：非饱和土 脱湿路径 水分变化路径 体积变形 土-水特征曲线 

分 类 号：TU43[建筑科学—岩土工程]