摘要
土−水特征曲线是非饱和土力学中最基本的参数之一,可用于预测非饱和土的各种性质。但是,测量土−水特征曲线耗时费事。为了解决这一问题,提出使用一点测量法和土的颗分参数相结合的方法预测Van Genuchten模型的3个参数。通过Van Genuchten模型的3个参数与43组(编号1~43)砂土的基本物理参数进行相关性分析,得出计算这3个参数的方程,进而通过一点测量法确定这3个参数的具体取值。结果表明:参数aV与组合参数(P_(1000)/P_(500))呈指数函数关系,参数mV与1/nV呈指数函数关系。敏感性分析揭示了SWCC一点测量法选取的测量点的基质吸力应在1~10 kPa之间。采用4组(编号44~47)砂土数据验证了提出的预测砂土土−水特征曲线的方法。结果显示,其R^(2)=0.959,表明所提出的方法能够很好地预测SWCC。
Soil-water characteristic curves(SWCCs)are one of the basic parameters in unsaturated soil mechanics,which is usually used to estimate the properties of unsaturated soils.However,the measurement of SWCC is time-consuming and laborious.In order to solve this problem,we used the one-point SWCC measurement and parameters of particle size distribution to estimate the three parameters of Van Genuchten equation for sandy soils.Parameters of the Van Genuchten model were correlated with the basic properties of 43(No.1-43)types of sandy soils.Then we obtained two equations to estimate the three parameters.The values of the three parameters were calculated by the two equations and one-point SWCC measurement.The results show that the parameter av can be expressed as an exponential function of the combined parameter(P_(1000)/P_(500)),and mv can be expressed as an exponential function of 1/nv.Sensitivity analysis shows that the one-point SWCC measurement locating in the range of 1 kPa and 10 kPa gave the most reliable estimated results.The proposed method was evaluated using a total of 4(No.44−47)types of sandy soils.It shows that the proposed method has a good performance in estimating SWCC.
作者
周兵红
ZHOU Bing-hong(The General Engineering Survey Institute of Railways of Gansu Co.,Ltd.,Lanzhou,Gansu 730000,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2022年第S01期222-228,236,共8页
Rock and Soil Mechanics
作者简介
第一作者:周兵红,男,1989年生,硕士,工程师,主要从事岩土工程勘察设计及施工等方面的研究。E-mail:zhoubh2020@sina.com
