基于等时曲线的软黏土弹黏塑性模型

罗庆姿; 陈晓平; 袁炳祥; 冯德銮

doi:10.11779/CJGE2018S2029

基于等时曲线的软黏土弹黏塑性模型 English Version

1. 广东工业大学土木与交通工程学院,广东广州 510006;
2. 暨南大学理工学院,广东广州 510632

基金项目: 国家自然科学基金项目（41472279,51308164）; 广东省自然科学基金博士启动项目（2016A030310345,2017A030310244）

详细信息

作者简介:
罗庆姿(1986- ),女,博士,讲师,主要从事土工试验及软土沉降等方面的教学和科研工作。E-mail: luoluo1986220@163.com。

通讯作者:
袁炳祥，E-mail：bingxiangyuan@hit.edu.cn

中图分类号: TU432
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出版历程
- 收稿日期: 2018-07-21
- 发布日期: 2018-10-29

Elastic visco-plastic model for soft clay based on isochronous curves

1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China;
2. College of Science and Engineering, Jinan University, Guangzhou 510632, China

摘要

摘要: 软黏土的变形与时间密切相关,包括固结效应与蠕变效应两部分,两者相互作用共同影响着土体的变形及长期变形。在Bjerrum等时曲线理论的基础上,推导了一个能描述软黏土变形时效特性的弹黏塑性本构模型,将此模型代替一维Terzaghi固结理论中的线弹性应力-应变关系,并进一步考虑非线性渗流的影响,实现了一维条件下蠕变-固结的非线性耦合作用。本模型中共有8个模型参数,物理意义明确,均可通过室内试验简单获取,利用Crank-Nicolson有限差分格式在一定的边界条件下可对控制方程进行求解。为验证此模型的有效性,对室内一维K₀侧限固结试验及Leroueil和Kabbaj的等应变率试验成果进行了模拟,理论计算值与试验结果能够较好吻合。
- 软黏土 /
- 时效特性 /
- 等时曲线 /
- 弹黏塑性 /
- 蠕变-固结耦合
Abstract: The deformation of soft clay is closely related to the time, including both consolidation effect and creep effect, between which the interaction determines the settlement and long-term settlement of soft soils. Based on the Bjerrum's theory of isochronous curves, an elastic visco-plastic constitutive model for soft clay is derived, which is used to replace the linear elastic stress-strain relationship of Terzaghi's consolidation theory. And with further consideration of nonlinear seepage influence, one-dimensional nonlinear governing equations which can couple the effect of creep and consolidation are established. There are 8 model parameters with concise physical meanings in this model, which can be obtained through laboratory tests easily. In addition, the Crank-Nicolson finite difference method can be used to solve the governing equations under certain boundary conditions. In order to verify the validity of the model, the calculated results by this model are contrasted with the results of oedometer tests and Leroueil and Kabbj' s CRS tests. It is shown that the calculated values are in good agreement with the experimental results.
- soft clay /
- time-dependent characteristics /
- isochronous curve /
- elastic visco-plastic model /
- creep-consolidation interaction

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参考文献(21)

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