三轴剪切过程中软黏土的微观结构及分形特征

刘勇健; 武建胜; 彭建文; 谢治堃

doi:10.12052/gdutxb.170177

欢迎来到能源电力期刊网！

English Version 期刊登录

您当前的位置：

首页 >

文章列表页 >

三轴剪切过程中软黏土的微观结构及分形特征

综合研究 | 更新时间：2026-05-27

- 三轴剪切过程中软黏土的微观结构及分形特征
- Microstructure and Fractal Characteristics of Soft Clay during Triaxial Shear Process
- 广东工业大学学报 2018年35卷第4期页码：86-93
- 作者机构：
  
  广东工业大学　岩土工程研究所,广东,广州,510006
- 作者简介：
  
  刘勇健(1968–)，女，副教授，博士，主要研究方向为岩土工程. E-mail：liu-yongjian@163.com
- 基金信息：
  
  国家自然科学基金资助项目(51178122);广东省自然科学基金资助项目(2016A030313692);广东省大学生创新实验项目(201611845154)
- DOI：10.12052/gdutxb.170177
  中图分类号： TU431
- 网络首发：2018-07-09，
  
  纸质出版：2018
- 稿件说明：
移动端阅览
刘勇健, 武建胜, 彭建文, 谢治堃. 三轴剪切过程中软黏土的微观结构及分形特征[J]. 广东工业大学学报, 2018, 35(4): 86-93.

Liu Yong-jian, Wu Jian-sheng, Peng Jian-wen, et al. Microstructure and Fractal Characteristics of Soft Clay during Triaxial Shear Process[J]. 2018, 35(4): 86-93.
刘勇健, 武建胜, 彭建文, 谢治堃. 三轴剪切过程中软黏土的微观结构及分形特征[J]. 广东工业大学学报, 2018, 35(4): 86-93. DOI： 10.12052/gdutxb.170177.

Liu Yong-jian, Wu Jian-sheng, Peng Jian-wen, et al. Microstructure and Fractal Characteristics of Soft Clay during Triaxial Shear Process[J]. 2018, 35(4): 86-93. DOI： 10.12052/gdutxb.170177.

摘要

土的物质组成和内部结构是决定土物理力学性质的主要因素; 当土性质变化时

土中孔隙大小和形状变化最直观. 为研究三轴剪切过程中软黏土微观结构变化特征

利用扫描电子显微镜获取了软黏土在不同应变速率和不同应变阶段的三轴固结不排水剪切试验后土试样的SEM图像; 计算得到了软土的等效孔径和孔隙(颗粒)分维值. 研究表明

该软黏土具有团粒-絮凝结构. 试验前后软黏土中的孔隙均以小孔径、中孔径为主

大孔径孔隙分布较少; 大孔隙主要存在于原状土和剪切破坏后土样中. 剪切过程中存在一个影响孔隙分布随应变速率变化的应变阈值. 软黏土具明显分形特征

孔隙分维值为1.891~1.750

颗粒分维值为1.825~1.908; 在剪切过程中

颗粒分布分维值增大

孔隙分布分维值减小

孔隙大小和形状变化最显著.

Abstract

The mineral composition and internal structure are the key factors in the determination of the physical and mechanical characteristics of the soft soil

and the variation of pore size and shape is obvious with the changes of soil properties. In order to investigate the microstructure and fractal characteristics of soft clay during the triaxial consolidated undrained shearing process

a lot of scanning electron microscopy (SEM) images of soft clay at different strain rates and strain stages were acquired. The equivalent pore size and fractal dimension of the soft soil were calculated. The results show that the particles and pores of soft clay have obvious fractal dimension characteristics while soft clay has the agglomerate-flocculation microstructure. The pores of soft clay before and after triaxial test are dominated by small pore size and medium pore size

and the large pore size distribution is less

which mainly exists in the undisturbed soil or the sheared soil. Soft clay has strain threshold affecting pore size distribution with strain rate in the shear process. With obvious fractal characteristics

the fractal dimension values (FDV) of pores varying from 1.891 to 1.750

the fractal dimension values of particles from 1.825 to 1.908

the FDV of particles increase and the FDV of pores decrease during the triaxial consolidated undrained shearing process

the size and shape of pores being relatively obvious.

关键词

Keywords

references

李彰明. 软土地基加固与质量控制[M]. 北京: 中国建筑工业出版社,2011.

胡瑞林, 官国琳, 李向东, 等. 黏性土微观结构定量模型及其工程地质特征研究[M]. 北京: 地质出版社, 1995.

LIU Y J, LI Z M. Grey-relation analysis and neural networks model for relationship between physico- mechanical indices and microstructure parameters of soft soils [J]. Rock and Soil Mechanics, 2011, 32(4): 1018-1024.

ZHOU C Y, MU C M. Distribution and microstructure classification of soft clay in the Pearl River Delta [J]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2004, 3(6): 81-84.

ZHANG L Z, HU R L, LI X Q, et al . Soil microstructure quantitative Analysis and its Application [J ] . Geological science and technology information, 2008, 27(1): 108-112.

GYLLAND A S, RUESLÅTTEN H, JOSTAD H P, et al . Microstructure observations of shear zones in sensitive clay [J ] . Engineering Geology, 2013, 163: 75-88.

TODORUK T R, LANGFORD C H, KANTZAS A. Pore-scale redistribution of water during wetting of air-dried soils as studied by low-field NMR relaxometry [J]. Environmental Science technology, 2003, 37(12): 2707-2713.

BAYER J V, JAEGER F, SCHAUMANN G E. Proton nuclear resonance (NMR) relaxometry in soil science applications [J]. Open Magn Reson J, 2010, 3(1): 15-26.

LI Z M, ZENG W X, GAO M L. Nuclear magnetic resonance experimental study on the characteristics of pore-size distribution in muck under several typical loading cases [J]. Acta Phys Sin, 2014, 63(5): 057401.

XU Y, ZHANG J C, LI W P. Research on microstructure fractal features of the saturation soft soil [J]. Rock and Soil Mechanics, 2007, 28(supp.): 49-52.

ZHANG X W, KONG L W, GUO A G, et al . Experiment study of pore distribution of strong structural clay under different consolidation pressures [J ] . Rock and Soil Mechanics, 2014, 35(10): 2794-2800.

LYU H B, ZHAO Y L, KONG L W, et al . Fractal feature of pore size distribution of a marine soft soil and its application [J ] . Journal of Guilin University of Technology, 2006, 26(1): 50-53.

谢和平.分形岩石力学导论[M].北京: 科学出版社, 1996.

XUE R, HU R L, MAO L T. Fractal study on the microstructure variation of soft soils in consolidation process [J]. China Civil Engineering Journal, 2006, 39(10): 87-91.

ZHOU H, WU J H. A research on microscopic parameters of soft soil pore based on fractal theory in the process of consolidation [J]. Journal of Guangdong University of Technology, 2017, 34(4): 41-46.

LIU Y J, LIU X Q, LIU Y H, et al . A contrastive analysis of the physico-mechanical properties of soft soils in the Pearl River Delta [J ] . Journal of Guangdong University of Technology, 2013, 30(3): 30-36.

LIU Y J, FU N, CHEN C X, et al . Study on microstructure changes of soft clay before and after triaxial impact load [J ] . Journal of Guangdong University of Technology, 2015, 32(2): 23-27.

康文武, 海相软土力学响应及加载速率效应研究[D]. 广州: 广东工业大学土木与交通工程学院, 2017.

浏览量

下载量

CSCD

文章被引用时，请邮件提醒。

提交

工具集

关联资源

三轴冲击荷载作用前后软黏土的微观结构变化研究

多因素状况下热阻涂料固化特性及机理研究

基于NMR和SEM的软土微观结构特征试验研究

具守恒量波动方程的循环双子网物理信息神经网络

储能变流器电能质量治理策略研究