Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (5): 1604-1616.doi: 10.13229/j.cnki.jdxbgxb.20230873

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Shear properties and stress-strain relationships characterization of Changsha compacted clay

An-shun ZHANG1,2(),Wei FU3,Jun-hui ZHANG1,2(),Feng GAO1,2   

  1. 1.Key Laboratory for Highway Engineering of Ministry of Education，Changsha University of Science & Technology，Changsha 410114，China
    2.Xiangjiang Laboratory，Changsha 410205，China
    3.CCCC Second Highway Consultants Co. ，Ltd. ，Wuhan 430056，China
  • Received:2023-08-18 Online:2025-05-01 Published:2025-07-18
  • Contact: Jun-hui ZHANG E-mail:cr11zhanganshun@163.com;zjhseu@csust.edu.cn

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Abstract:

To investigate the shear properties and stress-strain relationships of subgrade compacted clay， a series of unconsolidated and undrained triaxial tests were carried out on Changsha clay under different degrees of compaction， moisture contents， loading rates and confining pressures. The results show that the elastic modulus and ultimate strength decay with the decrease of degree of compaction， the increase of moisture content and the decrease of confining pressure， but there is a slight fluctuation with the loading rate. The Mohr-Coulomb strength criterion of subgrade clay under complex conditions is established to describe the variation law of the strength of subgrade clay with various factors. The total cohesion and total internal friction angle increase significantly with the increase of degree of compaction and the decrease of moisture content. With the increase of loading rate， the total cohesion decreases first and then increases， and the total internal friction angle increases first and then decrease. However， the fluctuation amplitude of these two indexes is weak due to the change of loading rate. The unified characterization method on stress-strain curves of Changsha clay is proposed， which can reasonably describe the three types deformation curves with strain softening， stability and hardening.

Key words: road engineering, subgrade compacted clay, stress-strain relationship, elastic modulus, ultimate strength, shear strength parameter

CLC Number: 

  • TU411

Table 1

Basic engineering parameters of the tested clay"

液限

/%

塑限

/%

塑性

指数

最佳含

水率/%

最大干

密度/（g·cm-3）

0.075 mm

通过率/%

比重
52.425.526.914.41.7367.72.66

Table 2

Scheme for triaxial test"

组

号

压实度

/%

含水率/OMC

加载速率/

（%×min-1）

围压

/kPa

1961.0（14.4%）0.7030、60、90、120
2931.0（14.4%）0.7030、60、90、120
3901.0（14.4%）0.7030、60、90、120
4871.0（14.4%）0.7030、60、90、120
5961.2（17.3%）0.7030、60、90、120
6961.4（20.2%）0.7030、60、90、120
7961.6（23.0%）0.7030、60、90、120
8961.2（17.3%）0.5030、60、90、120
9961.2（17.3%）0.8530、60、90、120
10961.2（17.3%）1.0030、60、90、120

Fig.1

Flow chart of triaxial test procedure"

Fig.2

Stress-strain curves under different degrees of compaction"

Fig.3

Failure modes under different degrees of compaction"

Fig.4

Stress-strain curves under different moisture contents"

Fig.5

Failure modes under different moisture contents"

Fig.6

Stress-strain curves under different loading rates"

Fig.7

Failure modes under different loading rates"

Fig.8

Elastic modulus under different influence factors"

Fig.9

Ultimate strengths under different influence factors"

Table 3

Verification results of the proposed ultimate strength prediction model"

数据来源abcdefgR2
本研究（黏土）4.97456.75-391.51-1.322.810.097.410.97
文献［8］（黏土）4.880.190.85-91.99185.090.2224.390.93
文献［9］（黏土）1.921.610.03-20.0446.720.094.940.99
文献［10］（黏土）2.362.14-0.14-5.4913.020.326.710.98
文献［24］（黏土）0.013.52-1.44-767.091386.480.2958.940.96
文献［25］（砂土）8.661.47-0.29-72.61102.140.0526.060.85

Fig.10

Mohr's semicircles and shear strength envelopes under different degrees of compaction"

Fig.11

Mohr's semicircles and shear strength envelopes under different moisture contents"

Fig.13

Shear strength parameters under different factors"

Fig.14

Prediction effect of parameters of the modified hyperbolic model"

Fig.15

Verification results of unified stress-strain characterization model of Changsha clay"

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