Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (6): 1790-1798.doi: 10.13229/j.cnki.jdxbgxb.20221550

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Long⁃term characterising plastic behavior of thawed subgrade clay under cyclic loads

Zhe ZHANG1,2(),Wei FU3,Jun-hui ZHANG1,2(),Chao HUANG4   

  1. 1.School of Traffic & Transportation Engineering，Changsha University of Science & Technology，Changsha 410114，China
    2.National Engineering Research Center of Highway Maintenance Technology，Changsha University of Science & Technology，Changsha 410114，China
    3.CCCC Second Highway Consultants Co. ，Ltd. ，Wuhan 430052，China
    4.School of Civil Engineering，Central South University，Changsha 410075，China
  • Received:2022-12-04 Online:2023-06-01 Published:2023-07-23
  • Contact: Jun-hui ZHANG E-mail:zzhe@stu.csust.edu.cn;zjhseu@csust.edu.cn

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Abstract:

The effects of the number of freeze-thaw cycles was used the method of indoor test and the stress level on the static shear strength and plastic deformation soil were investigated. The results show that the static shear strength decreases with the decrease of confining pressure and the accumulation of freeze-thaw cycles， and the permanent deformation gradually develops from plastic stability to plastic creep or incremental instability when the dynamic stress level increases. Based on the comprehensive analysis of the test results， the critical stress level to avoid the instability of permanent deformation and the discrimination criteria of each type are defined， a description formula of critical dynamic stress considering confining pressure and freeze-thaw cycles is proposed， and the ratio of shear stress generated by dynamic stress to shear strength is used to represent shear action， and a mechanical-empirical model suitable for permanent deformation of subgrade clay subjected to freeze-thaw cycles was established and verified. The results of the study can provide theoretical support for the stability and durable operation of the subgrade in the monsoon freeze zone.

Key words: road engineering, critical dynamic stress, permanent deformation, dynamic triaxial tests, subgrade soils, freeze-thaw cycles

CLC Number: 

  • TU411

Table 1

Static triaxial test failure strength"

冻融循环次数围压/kPa
306090
0502.3642.2742.5
1474.6606.8701.6
3447.5572.2661.6
6427.9547.1632.6
10413.9529.2611.9

Fig.1

Permanent deformation test results"

Fig.2

Critical dynamic stress test results under different confining pressures"

Fig.3

Critical dynamic stress test results under different freeze-thaw cycles"

Fig.4

Fitting results of critical dynamic stress"

Fig.5

Three state criteria for permanent deformation"

Table 2

Comparison results of criteria"

来源组类Shakedown理论判别结果Werkmeister准则判别结果本文判别准则判别结果
文献［8］1ACA
2BCB
3BCB
4BCB
5BCB
6CCC
7ACA
8ACA
9BCB
10BCB
11BCB
12BCB
文献［29］1ACA
2ACA
3BCB
4BCB
5ABA
6ACA
7ACB
8BCB
9ACA
10ACA
11ACA
12ACA

Fig.6

Final value of permanent deformation under different deviatoric stresses"

Fig.7

Final value of permanent deformation under different confining pressures"

Fig.8

Permanent deformation final value under different freeze-thaw cycles"

Fig.9

Schematic diagram of shear stress ratio"

Fig.10

Verification of rationality of permanent deformation prediction model"

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