土的非线性应力-应变关系及一般数学模型  

Nonlinear stress - strain relationship and general mathematics model of soils

作　　者：张尔齐[1] 周敏锋[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《哈尔滨工业大学学报》2004年第1期99-101,共3页Journal of Harbin Institute of Technology

摘　　要：将土的剪切试验测得的应力-应变关系分成逐渐硬化类型和峰值后软化类型,提出了可以统一表示这两种类型应力-应变关系的表达式。以三轴剪切试验测得的应力-应变关系为基础,从统一的表达式推出了割线模量和切线模量表达式。按逐渐硬化类型和峰值后软化类型两种情况分别给出了确定参数的方法。该表达式为发展一个更一般的非线性力学模型提供了基础。The stress-strain relationship of soil established from shear tests is distinguished into two kinds - progressive hardening type and post-peak softening type. A unified mathematical expression is presented to describe the two types of stress-strain relationship. Based on the stress-strain relationship established from tri-axial tests, the tangent modulus and secant modulus are derived from the unified mathematical expression. The methods of determining the parameters in the unified expression are developed separately for the two cases, and a sample is showed to illustrate the methods. The unified expression provides a base to develop a general nonlinear mechanics model of soils.

关 键 词：数学模型 割线模量 切线模量 非线性力学 应力—应变关系 力学性能 垃圾场 

分 类 号：TU431[建筑科学—岩土工程]