基于各向等压压缩和土的收缩试验预测脱湿路径下的土水特征曲线  

Prediction of soil-water characteristic curves under drying path based on isotropic compression and soil shrinkage tests

作　　者：叶云雪 徐帆 刘小文[4] 吴珺华[1,2] 丁鲁强 YE Yunxue;XU Fan;LIU Xiaowen;WU Junhua;DING Luqiang(College of Civil Engineering and Architecture,Nanchang Hangkong University,Nanchang 330063,China;Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education,Chongqing Jiaotong University,Chongqing 400074,China;College of Architectural Engineering,Jiangxi University of Applied Science,Nanchang 330100,China;School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China;School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]南昌航空大学土木建筑学院,江西南昌330063 [2]水利水运工程教育部重点实验室,重庆400074 [3]江西应用科技学院建筑工程学院,江西南昌330100 [4]南昌大学建筑工程学院,江西南昌330031 [5]河北工业大学土木与交通学院,天津300401

出　　处：《岩土工程学报》2023年第4期847-854,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51268046);水利水运工程教育部重点实验室开放基金项目(SLK2021A05);南昌航空大学博士启动基金项目(EA201911396)。

摘　　要：由于土水特性试验需要专门的仪器且耗时,所以土水特征曲线在工程设计中的应用尚未普及。以粉质砂土、黏性土和膨胀土为研究对象,通过开展室内饱和土的各向等压压缩和土的收缩试验,提出一个预测脱湿路径下低吸力范围内SWCC的简单方法。研究结果表明:基于有效应力与变形的统一关系,可以构建饱和土和非饱和土之间的联系;针对不同初始干密度下土的收缩特征曲线,利用曲率公式并结合所提均值法,可定量获得残余含水率;利用所提方法预测的低吸力范围SWCC与试验数据具有良好的一致性。该研究结果可以确保在进行必要的常规饱和土试验时,能够间接获得非饱和水力参数。Because the soil-water characteristic tests require professional instruments and are time-consuming,the application of soil-water characteristic curves(SWCCs)in engineering design is not popular.Taking three kinds of soils as the research objects,including silty sand,cohesive soil and expansive soil,a simple method is proposed to predict the SWCCs in drying path within the low suction range by performing the isotropic compression tests of saturated soil and shrinkage tests of soil in the laboratory.The research results show that based on the unified relationship between the effective stress and the deformation,the connection between the saturated soil and the unsaturated soil can be established.According to the soil shrinkage characteristic curves under different initial dry densities,the residual water content can be obtained quantitatively by using the curvature formula and the proposed mean value method.The SWCCs within the low suction range predicted by the proposed method are in good agreement with the experimental data obtained in this study.This work contributes to ensure that the unsaturated hydraulic parameters are obtained indirectly when it is necessary to carry out the conventional saturated soil tests.

关 键 词：非饱和土 各向等压压缩 收缩 土水特征曲线 预测 

分 类 号：TU433[建筑科学—岩土工程]