文献类型：期刊文献

中文题名：黏土非线性模型的改进切线模量

英文题名：Improved tangent modulus of nonlinear soil model

作者：王伟[1];卢廷浩[2];周干武[2]

机构：[1]绍兴文理学院土木工程系;[2]河海大学岩土工程研究所

年份：2007

卷号：29

期号：3

起止页码：458

中文期刊名：岩土工程学报

外文期刊名：Chinese Journal of Geotechnical Engineering

收录：CSTPCD、、EI(收录号：20071910593937)、北大核心2004、Scopus(收录号：2-s2.0-34248217413)、CSCD2011_2012、北大核心、CSCD

语种：中文

中文关键词：土体非线性模型;3参数应力应变模型;改进切线模量;数学特征方程;控制微分方程

外文关键词：nonlinear model of soil; 3-parameter model of stress and strain; improved tangent modulus; mathematic propertiesequation; differential control equation

中文摘要：切线模量描述是土体非线性模型中的一个基本问题。首先,引入“半值强度指数”概念建立了土体应力应变曲线的数学特征方程,分析了双曲线应力应变模型的数学缺陷。接着,根据试验数据分析提出了土体应力应变曲线的控制微分方程,建立了土体应力应变曲线的3参数新模型,新模型克服了双曲线模型的缺陷;证明了双曲线模型是该新模型的特例。最后,在3参数新模型的基础上,改进了土体的切线模量表达,给出了参数确定方法,并对三轴试验结果进行了模拟。

外文摘要：Tangent modulus was essential to nonlinear soil model, and it was necessary to understand it properly during numerical simulation. First, a new concept namely half strength index was introduced to build the mathematic properties equations of stress-strain relationship, then the deficiency of hyperbolic expression of the relationship was indicated in terms of it. Second, according to laboratory test data, differential control equation of soil stress-strain relationship was presented and a new 3-parameter stress-strain expression was established. It was shown that the hyperbolic expression was the simplified type of the 3-parameter expression. Third, an improved tangent modulus of soil was obtained based on the new stress-strain expression, and methods to determine its parameters were discussed. Finally, simulation of triaxial test data using the improved tangent modulus was conducted.