花岗岩残积土的全吸力土-水特征曲线试验及模型研究  

Test and model study on total suction soil-water characteristic curves of granite residual soil

作　　者：刘小文[1] 陈嘉帅 刘星志 Liu Xiaowen;Chen Jiashuai;Liu Xingzhi(School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学建筑工程学院,南昌330031

出　　处：《工程勘察》2020年第6期1-8,共8页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(51268046);江西省自然科学基金资助项目(20151BAB203037);江西省水利厅科技项目(KT2012).

摘　　要：为了能便捷准确地估算非饱和土的强度、变形及相应的渗透系数,土-水特征曲线的试验与理论研究至关重要。目前对于土-水特征曲线的测定已有多种试验方法,但无论何种方法,都有着试验周期较长且测量范围有限等缺点。为了能够以便捷方式得到大量存在于江西赣南地区花岗岩残积土的全吸力范围土-水特征曲线,分别采用压力板法(0~0.4MPa)、滤纸法(0~40MPa)、饱和盐溶液法(3~367MPa)测定不同吸力范围内的土-水特征曲线,通过数据筛选整合成一条全吸力范围内土-水特征曲线,并使用4种常用的土-水特征曲线数学模型,对试验所得的土-水特征曲线进行拟合寻优。研究结果表明:通过对4种数学模型的拟合效果比较分析,VG模型预测江西赣南地区花岗岩残积土全吸力范围的土-水特征曲线与试验数据吻合度最高。本研究对于花岗岩残积土的全吸力范围内土-水特征曲线预测有着重要意义。In order to estimate the strength,deformation and corresponding permeability coefficient of unsaturated soil conveniently and accurately,the experimental and theoretical study on soil-water characteristic curves is very important in unsaturated soil mechanics.At present,there are many test methods for the determination of soil-water characteristic curves,but no matter what method,it has some shortcomings such as the long test period,limited measurement range and so on.In order to obtain a large number of soil-water characteristic curves existing in the full suction range of granite residual soil in Gannan area of Jiangxi Province in a convenient way,the soil-water characteristic curves in different suction ranges are measured by using the pressure plate method(0~0.4 MPa),filter paper method(0~40 MPa)and saturated salt solution method(3~367 MPa)respectively.Four commonly used mathematical models for soil-water characteristic curves are used to fit and optimize the soil-water characteristic curves obtained from the experiments.The study results show that through the comparative analysis of the fitting effects of the four mathematical models,the soil-water characteristic curve with VG model for predicting the total suction range of granite residual soil in Gannan area of Jiangxi Province is the highest.This study is of great significance for the prediction of soil-water characteristic curves in the full suction range of granite residual soil.

关 键 词：全吸力 土-水特征曲线 数学模型 预测 

分 类 号：TU411[建筑科学—岩土工程]