岩土工程学报2008，Vol.30Issue(6)：880-888,9.
一个能够模拟软土时效特性的简单弹黏塑性模型
Modelling of time-dependent behaviour of soft soils using simple elasto-viscoplastic model
摘要
Abstract
The purpose of this study was to present the development of an elasto-viscoplastic constitutive model to describe the time-dependent behaviour of soft soils. The elasto-viscoplastic model was established within the framework of Perzyna's overstress theory and the Modified Cam Clay model. The stress-strain relationship was solved by using an implicit backward Euler method of stress with updated algorithm, and implemented in a finite element program. Different types of tests were simulated using the EVP-MCC model to simulate the time-dependent behaviour of soft soils under different loading conditions, such as the strain rate effects on preconsolidation pressure as well as on undrained shear strength; the primary, secondary consolidation behaviour and stress effects on secondary compression coefficient ; the creep and stress relaxation features under different stress levels. It was shown that the model could satisfactorily describe the time-dependent behaviour of normally consolidated or slightly overconsolidated clayey soils along different loading paths. Time-dependent properties behaved in multiple stages triaxial tests, and field and laboratory pressuremeter tests had also been successfully simualted by the proposed EVP-MCC model.关键词
弹黏塑性模型/时效特性/软土/应变速率/蠕变/应力松弛Key words
elasto-viscoplastic constitutive model/time-dependency/soft soils/strain rate/creep/relaxation分类
建筑与水利引用本文复制引用
尹振宇,张冬梅,HICHER Pierre-yves,黄宏伟..一个能够模拟软土时效特性的简单弹黏塑性模型[J].岩土工程学报,2008,30(6):880-888,9.基金项目
National Natural Science Foundation of China (50608058) （50608058）
Hi-tech Research and Development Program (863 Program) of China (2006AA11Z118) （863 Program）
