反复等向加卸载路径下粉质黏土变形特性研究

陈勇

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反复等向加卸载路径下粉质黏土变形特性研究

更新时间：2025-09-25

- 反复等向加卸载路径下粉质黏土变形特性研究
- Cyclic Response and Modeling of Saturated Silty Clay Due to Repeated Isotropic Loading and Unloading
- 防灾减灾工程学报 2020年第2期页码：145-151
- 作者机构：
  
  三峡大学三峡库区地质灾害教育部重点实验室,湖北,宜昌,443002
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目（51409149）、中国地质调查局项目(DD20190716)资助
- DOI：
  中图分类号： TU43
- 纸质出版：2020
- 稿件说明：
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陈勇,隆海鹏,曹玲,CHAN Dave.反复等向加卸载路径下粉质黏土变形特性研究[J].防灾减灾工程学报,2020,(2):145-151

CHEN Yong. Cyclic Response and Modeling of Saturated Silty Clay Due to Repeated Isotropic Loading and Unloading[J]. 2020, (2): 145-151.
陈勇,隆海鹏,曹玲,CHAN Dave.反复等向加卸载路径下粉质黏土变形特性研究[J].防灾减灾工程学报,2020,(2):145-151 DOI：

CHEN Yong. Cyclic Response and Modeling of Saturated Silty Clay Due to Repeated Isotropic Loading and Unloading[J]. 2020, (2): 145-151. DOI：

摘要

黏土的变形特性与应力路径密切相关，直接影响到相关工程的安全性。针对三峡库岸某路基边坡粉质黏土，采用应力路径控制试验系统，开展了两组等向固结应力状态下反复多次的加卸载试验，揭示了土体的体积变形发展规律，发现再固结过程呈现为一条先平缓后变陡的曲线，说明前期固结压力范围内的再加载也会产生不可恢复的塑性变形，且变形速率随加卸载循环次数逐渐减小。最后，结合试验曲线特点，建立了土体再固结系数与加卸载次数及应力状态相关的数学模型，能够较好的模拟反复等向加卸载条件下土样的体变特征，且可预测土体经历更多次加卸载循环中的次固结过程，为土体的持续塑性变形分析和预测提供参考。

Abstract

The deformation characteristics of clay are closely related to the stress path

which affects the safety of related projects directly. Aiming at the silty clay from a embankment slope beside Three Gorges Reservoir

two groups of repeated isotropic loading-unloading tests are completed by stress path controlling equipment

which reveals the cyclic response of soil volumetric deformation. The reloading processes can be described as curves of first gentle and then steep

which induces unrecoverable plastic deformations even when the stresses are in the range of pre-consolidated pressure

and the deformation rate decreases gradually with the increase of loading-unloading cycles. Then

on the basis of the characteristics of test curves

a mathematical model is established to describe the relationship of re-consolidation coefficients with the cycle number and the stress state. The presented model can simulate the volumetric cyclic response due to repeated isotropic loading and unloading and predict the deformation developments due to more reloading cycle. Moreover

the calculation results can also provide references for analyzing and predicting the continuous plastic deformation well.

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references

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