Effect of stress path on strength properties of Zhanjiang strong structured clay

KONG Ling-wei; ZANG Meng; GUO Ai-guo; TUO Yong-fei

doi:10.16285/j.rsm.2015.S1.004

English Version Journal Login

您当前的位置：

首页 >

文章列表页 >

Effect of stress path on strength properties of Zhanjiang strong structured clay

更新时间：2026-06-25

- Effect of stress path on strength properties of Zhanjiang strong structured clay
- Vol. 36, Issue S1, Pages: 19-24(2015)
- 作者机构：
  
  1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北,武汉,430071
  2. 中交第二公路勘察设计研究院有限公司隧道与地下工程设计院,湖北,武汉,430056
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2015.S1.004
  CLC： TU443
- Online First：14 June 2018，
  
  Published：2015
- 稿件说明：
移动端阅览
KONG Ling-wei, ZANG Meng, GUO Ai-guo, et al. Effect of stress path on strength properties of Zhanjiang strong structured clay[J]. 2015, 36(S1): 19-24.
DOI：

KONG Ling-wei, ZANG Meng, GUO Ai-guo, et al. Effect of stress path on strength properties of Zhanjiang strong structured clay[J]. 2015, 36(S1): 19-24. DOI： 10.16285/j.rsm.2015.S1.004.

摘要

为探讨湛江强结构性原状土与相应重塑土在不同应力路径下的强度特性及其与结构性的关联性，开展了在不同固结条件下的主动压缩、被动压缩、主动伸长3种应力路径试验，分析了该强结构性黏土在不同应力条件下的力学性状与强度特性。结果表明，湛江黏土的剪切破坏形态主要是单一型、双交叉剪切带与“腰鼓”型3类，应力-应变特性主要为轻度应变软化、强烈应变软化、轻度应变硬化、强烈应变硬化4类；偏压固结下试样破坏应变小于等压固结相应值，破坏强度及初始弹性模量比后者大；不同应力路径下土的强度差异主要反映在结构屈服前有效黏聚力的不同，结构屈服前，原状土的黏聚力高于重塑土的黏聚力，内摩擦角小于后者；结构屈服后，黏聚力逐渐减小，内摩擦角略有增大。原状土到重塑土的转变过程是黏聚力与内摩擦力在土体内部相互消长的过程，强结构性黏土在结构屈服前的强度指标具有较强应力路径依赖性。

Abstract

To explore the strength properties of undisturbed sample and remolded sample of Zhanjiang strong structured clay under different stress paths and its relevance to the soil structure

the stress path tests of such as conventional triaxial compression(CTC)

reduced triaxial compression(RTC) and conventional triaxial extension(CTE) under different consolidation conditions are carried out

the mechanical behaviors as well as the strength properties of strong structured clay are analyzed. The results show that the shear failure modes of Zhanjiang clay mainly include unitary type

double crossover shear zone and waist drum type; and the stress-strain properties mainly include mild strain softening

intense strain softening

mild strain hardening and intense strain hardening. The failure strain of all the samples under anisotropic consolidation is less than that of isotropic consolidation while the breaking strength and initial elastic modulus are larger. The strength properties of clay under different stress paths are mainly reflected in the change of effective cohesion before the structure yielded; undisturbed sample has a higher cohesion and lower frictional angle compared with the remolded sample; but after structure yielded

the cohesion decreases and the frictional angle increases gradually. The transition from undisturbed sample to remolded sample is a growth and decline process of cohesion and friction inside the microstructure of clay. Based on the results

it is pointed out that the strength indexes of strong structured clay before the structure yielding has a quite strong dependence to the stress paths.

关键词

Keywords

references

Views

379

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Changing rule of long-term strength of frozen loess cohesion under impact of freeze-thaw cycle

Experimental study of SEM-EDS for cementation bond characteristics of Zhanjiang clay

Study of pore characteristics of offshore clay by SEM and MIP and NA methods

Effects of overconsolidation ratio and stress rate on unloading mechanical behavior of expansive clay

Undrained shear strength determination of structured clays based on effective consolidation stress method

Related Author

ZHOU Hong

ZAHNG Yu-chuan

ZHANG Ze

FENG Wen-jie

ZHOU Bo

WU Jun-jie

ZHANG Xian-wei

KONG Ling-wei

Related Institution

Shaanxi General team, China Construction Materials and Geolgical Prospecting Center

College of Civil Engineering and Mechanics, Lanzhou University

State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences

Key Laboratory of Mechanics on Disaster and Environment in Western China of Ministry of Education, Lanzhou University

State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences

AI问答

⁰