掺砾成都黏土的本构模型及其在FLAC<sup>3D</sup>中的实现

罗会武; 韩磊; 刘恩龙; 陈生水; 傅中志

doi:10.11779/CJGE2015S1041

掺砾成都黏土的本构模型及其在FLAC^3D中的实现 English Version

1. 四川大学水力学与山区河流开发保护国家重点实验室、水利水电学院,四川成都 610065; 2. 南京水利科学研究院,江苏南京 210029

基金项目: 国家自然科学基金项目（91215301）

详细信息

作者简介:
罗会武(1988- ),男,硕士研究生,主要从事岩土工程方面的科研工作。

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出版历程
- 收稿日期: 2015-03-25
- 发布日期: 2015-07-24

Constitutive model for Chengdu clay with some graves and its implementation in FLAC^3D

1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu 610065,China; 2. Nanjing Hydraulic Research Institute, Nanjing 210029, China

摘要

摘要: 分析掺砾石成都黏土的三轴试验结果得到如下结论：试样表现为应变硬化特性,但偏应力增速较快,且在轴向应变达到较小值时偏应力就达到了稳定值,而体变随轴向应变的增加而平缓的增加。可见,试样在轴向应变较小时发生轻微的剪胀而减缓体变的增加速率;当达到塑性流动时,试件发生明显的剪缩而继续引起体变的增加。修正剑桥模型描述此类特性有所欠缺。以修正剑桥模型在FLAC^3D中的实现过程为基础,将魏汝龙模型写入FLAC^3D中来模拟软硬程度不同的土并引入了黏聚力c,考虑了塑性体应变硬化及剪应变引起的体变,模拟结果表明修改的模型能较好的反映此类土的特性。将试验值对比模拟值,发现随着砾石含量的增加,试样变硬,保水性变差。
- 成都黏土 /
- 修正剑桥模型 /
- 魏汝龙模型 /
- 硬化理论 /
- FLAC3D
Abstract: The results of the triaxial shear tests on Chengdu clay with some gravels show that: (i) The samples behave as strain-hardening type while the deviator stress increases rapidly and reaches steady state in the small axial strain level. (ii) The volumetric strain increases slowly and does not achieve stability when the axial strain increases at the same speed. So the samples behave slightly dilatancy with the increasing speed of the volumetric strain within small axial strain. They behave apparent contraction with the increasing volumetric strain when plastic flow occurs. As the capability of the modified Cam-clay model is insufficient to describe such features well, Wei Rulong model considering the cohesion c is incorporated into FLAC^3D to stimulate the hardening properties of soils, which considers the influence of the plastic volumetric strain hardening and the volumetric strain caused by the shearing strain based on the performance of modified Cam-clay model embedded in the FLAC^3D. The simulated results show that the proposed model can reflect the results of the triaxial shear tests well. By comparing the test data with the calculated results, it is indicated that the strength of the samples increases, and its water retentivity becomes weaker with the increase of the contents of gravels.
- Chengdu clay /
- modified Cam-clay model /
- Wei Rulong model /
- hardening theory /
- FLAC3D

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