结构性土的三维修正剑桥模型研究

李杭州; 张志龙; 廖红建; 宋丽; 徐建腾

doi:10.11779/CJGE2022S1003

结构性土的三维修正剑桥模型研究 English Version

西安交通大学土木工程系, 陕西西安 710049

基金项目:

陕西省重点研发计划项目 2021SF-517

陕西省重点研发计划项目 2020SF-394

详细信息

作者简介:
李杭州(1977—)，男，江苏丰县人，副教授，主要从事岩土本构关系方面的研究。E-mail: lihangzhou77@163.com

中图分类号: TU452
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出版历程
- 收稿日期: 2022-09-27
- 网络出版日期: 2023-02-06
- 刊出日期: 2022-11-30

Three-dimensional modified Cam-clay model for structured soils

Department of Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China

摘要

摘要: 土的结构性和应力状态是影响土力学行为的重要因素，在临界状态土力学框架内，考虑中间主应力的作用，结合统一强度理论，引入洛德角推导出统一强度参数，对临界状态线进行修正，使其能够反映不同应力状态下的临界状态。考虑结构性的影响，将其引入修正剑桥模型屈服函数中，采用非相关联流动法则，确定剪胀应力方程，建立可以反映中间主应力的结构性本构模型。采用黏性土的真三轴试验对所建立本构方程进行验证，结果表明所建立的本构模型可以较好的预测三维应力状态下的本构模型，验证了模型的合理性。
- 结构性 /
- 本构模型 /
- 临界状态线 /
- 三维应力状态
Abstract: The mechanical behaviors of soils are dependent upon the structure and the stress state. Based on the unified strength theory, the unified strength parameters are proposed by introducing Lode's angle into the unified strength theory. The critical state line is modified by considering the effect of the intermediate principle stress under the framework of the critical state concept. The effects of structure are introduced into the yield function of the modified Cam-clay model. The non-associated flow law is adopted. The equation for dilatancy stress is determined. A structural constitutive model that can reflect the effects of the intermediate principal stress is proposed. The model is verified by true triaxial tests of a clay. The results show that the proposed model can predict the stress-strain relationships well.
- structure /
- constitutive model /
- critical state line /
- three-dimensional stress state

HTML全文

图 1 统一摩擦角随应力状态的变化

Figure 1. Variation of unified internal friction angle with θ_σ

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图 2 临界状态线斜率变化图

Figure 2. Variation of slope of critical state line

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图 3 在π平面上的屈服面轨迹

Figure 3. Loci of yield function in π plane

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图 4 本构模型的验证

Figure 4. Validation of proposed constitutive model

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