Unconfined compressive strength characteristics of dehumidified laterite under wet-dry cycle

TANG Yunli; HUANG Ying; HE Dengfang; NAN Haiyu

doi:10.11835/j.issn.2096-6717.2021.099

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Unconfined compressive strength characteristics of dehumidified laterite under wet-dry cycle

Civil Engineering | 更新时间：2023-06-25

- Unconfined compressive strength characteristics of dehumidified laterite under wet-dry cycle
- Journal of Civil and Environmental Engineering Vol. 45, Issue 1, Pages: 112-121(2023)
- 作者机构：
  
  昆明理工大学电力工程学院，昆明 650500
- 作者简介：
  
  TANG Yunli (1996- ), main research interest: engineering characteristics of laterite, E-mail: 353749454@qq.com.
  HUANG Ying （corresponding author）， professor， E-mail： huangying3764@sina.com.
- 基金信息：
  
  National Natural Science Foundation of China(51568031)
- DOI：10.11835/j.issn.2096-6717.2021.099
  CLC： TU411.6
- Received：22 December 2020，
  
  Published：25 February 2023
- 稿件说明：
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TANG Yunli, HUANG Ying, HE Dengfang, et al. Unconfined compressive strength characteristics of dehumidified laterite under wet-dry cycle[J]. Journal of Civil and Environmental Engineering, 2023, 45(1): 112-121.
DOI：

TANG Yunli, HUANG Ying, HE Dengfang, et al. Unconfined compressive strength characteristics of dehumidified laterite under wet-dry cycle[J]. Journal of Civil and Environmental Engineering, 2023, 45(1): 112-121. DOI： 10.11835/j.issn.2096-6717.2021.099.

摘要

以云南红土为研究对象，以湿—干循环作为控制条件，考虑湿—干循环次数、初始含水率、干密度3个影响因素，进行室内无侧限抗压强度试验，研究湿—干循环作用下脱湿红土的无侧限抗压强度与湿—干循环次数、初始含水率、干密度的关系。结果表明：经过湿—干循环作用，脱湿红土的应力—应变关系曲线呈典型的应变软化型特征。相比湿—干循环前，湿—干循环后红土的应力—应变关系曲线的应变软化特征更为明显，无侧限抗压强度提高，且随着湿—干循环次数的增大，脱湿红土的无侧限抗压强度减小。不同初始含水率、干密度下，脱湿红土的应力—应变关系曲线均呈应变软化型；随着初始含水率的增大，湿—干循环前，素红土的无侧限抗压强度减小，相对应的峰值应变增大；湿—干循环后，脱湿红土的无侧限抗压强度增大，相对应的峰值应变增大。随着干密度的增大，湿—干循环前后红土的无侧限抗压强度均增大，相对应的峰值应变也呈增大趋势。

Abstract

This paper takes Yunnan laterite as the research object

takes the wet-dry cycle as the control condition. The indoor unconfined compressive strength test is carried out considering the three influencing factors of wet-dry cycle times

initial moisture content and dry density. The relationship between the unconfined compressive strength of dehumidified laterite under wet-dry cycle and the wet-dry cycle times

initial moisture content and dry density is studied. The results show that the stress-strain relationship curve of the dehumidified laterite presents typical strain-softening characteristics after the wet-dry cycle. Compared with that before the wet-dry cycle

the strain softening characteristics of the stress-strain curve of the laterite after the wet-dry cycle are more obvious

and the unconfined compressive strength increases

and with the increase of the number of wet-dry cycles

the unconfined compressive strength decreases. Under different initial moisture content and dry density

the stress-strain curves of dehumidified laterite are strain softening. With the increase of initial moisture content

the unconfined compressive strength of laterite decreases and the corresponding peak strain increases before the wet-dry cycle

and after the wet-dry cycle

the unconfined compressive strength and the corresponding peak strain of dehumidified laterite increase. With the increase of dry density

the unconfined compressive strength of laterite increases before and after the wet-dry cycle

and the corresponding peak strain also increases.

关键词

Keywords

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