Influence of pore solution on cumulative deformation and damping ratio of expansive soil under cyclic loading

ZHUANG Xin-shan; ZHOU Rong; ZHOU Mu-kai; TAO Gao-liang; JIN He-yi

doi:10.16285/j.rsm.2021.1141

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Influence of pore solution on cumulative deformation and damping ratio of expansive soil under cyclic loading

更新时间：2026-06-25

- Influence of pore solution on cumulative deformation and damping ratio of expansive soil under cyclic loading
- Vol. 43, Issue S2, Pages: 1-10(2022)
- 作者机构：
  
  湖北工业大学土木建筑与环境学院,湖北,武汉,430068
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.1141
  CLC： TU443
- Online First：03 October 2022，
  
  Published：2022
- 稿件说明：
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ZHUANG Xin-shan, ZHOU Rong, ZHOU Mu-kai, et al. Influence of pore solution on cumulative deformation and damping ratio of expansive soil under cyclic loading[J]. 2022, 43(S2): 1-10.
DOI：

ZHUANG Xin-shan, ZHOU Rong, ZHOU Mu-kai, et al. Influence of pore solution on cumulative deformation and damping ratio of expansive soil under cyclic loading[J]. 2022, 43(S2): 1-10. DOI： 10.16285/j.rsm.2021.1141.

摘要

膨胀土是一种特殊土体，其不可避免地涉及公路、铁路等基础建设，而孔隙溶液环境变化对膨胀土影响较大。采用GDS真/动三轴仪对NaCl溶液下的膨胀土进行循环荷载试验，研究了孔隙溶液浓度变化下膨胀土动力特性，重点分析了不同浓度、动应力幅值对NaCl溶液下膨胀土累积变形与阻尼比的影响。结果表明，随NaCl溶液浓度增大，膨胀土累积变形量减小；而随幅值增加，累积变形量逐渐增大。根据不同浓度、幅值下膨胀土振次−累积变形曲线，利用单指数函数对其进行拟合和判别。不同NaCl溶液浓度下，膨胀土的阻尼比曲线随幅值增加逐渐分离；其阻尼比随浓度增加逐渐减小，随幅值增加逐渐增大。建立了浓度与平均阻尼比关系模型，为实际工程提供参考依据。

Abstract

Expansive soil is a special kind of soil

which inevitably involves infrastructure construction such as roads and railways. However

the change of pore solution environment has a comparatively great impact on expansive soil. In this study

a cyclic load test on expansive soil in NaCl solution was carried out by using GDS true/dynamic triaxial instrument. The dynamic characteristics of expansive soil under the change of pore solution concentration were studied

and the cumulative deformation and damping ratio of expansive soil in NaCl solution with different concentrations under different dynamic stress amplitudes were analyzed. The results show that as the concentration of NaCl solution increases

the cumulative deformation of expansive soil decreases; and as the amplitude increases

the cumulative deformation gradually increases. According to the vibration frequency-accumulative deformation curve of expansive soil under different concentrations and amplitudes

a single exponential function is used to fit and judge it. The damping ratio curve of expansive soil under different NaCl solution concentrations gradually separates with the increase of the amplitude; the damping ratio gradually decreases with the increase of the concentration

and gradually increases with the increase of the amplitude. A model of the relationship between concentration and average damping ratio is established to provide reference for actual engineering.

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