Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (8): 2339-2349.doi: 10.13229/j.cnki.jdxbgxb.20211151

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Statistical damage model of frozen expansive soil considering temperature effect

Xin-yu LI1,2,3(),Xian-zhang LING1,2,3(),Na QU1   

  1. 1.School of Civil Engineering，Harbin Institute of Technology，Harbin 150090，China
    2.Chongqing Research Institute，Harbin Institute of Technology，Chongqing 401135，China
    3.Heilongjiang Research Center for Rail Transit Engineering in Cold Regions，Harbin Institute of Technology，Harbin 150090，China
  • Received:2021-11-02 Online:2023-08-01 Published:2023-08-21
  • Contact: Xian-zhang LING E-mail:18B933025@stu.hit.edu.cn;lingxianzhang@hit.edu.cn

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Abstract:

In order to study the low temperature mechanical properties of expansive soil in the alpine deep seasonal permafrost region， the consolidation undrained shear tests under low confining pressure in different freezing temperatures， moisture content and freeze-thaw cycles were carried out. The results show that the stress-strain curves of the frozen expansive soil change from hardening to softening with the decrease of freezing temperature and initial water content. The effect of freeze-thaw cycles intensifies the softening effect and promotes the sensitivity of confining pressure. When the freezing temperature is within the frozen zone， the shear process of frozen expansive soil can be divided into four stages with the increase of axial strain： elastic stage， plastic shear shrinkage stage， plastic dilatancy stage and failure stage. The elastic modulus of frozen expansive soil increases with decreasing temperature and presents a good linear correlation. The statistical damage model of frozen expansive soil considering the influence of temperature was deduced， and the law of macroscopic mechanical properties deterioration of frozen expansive soil was revealed.

Key words: frozen expansive soil, elastic modulus, stress-strain relation, damage threshold, statistical damage model

CLC Number: 

  • TU443

Table 1

Experimental scheme of triaxial test"

试样编号试验温度/℃含水率/%冻融循环次数围压/kPa
1#-121030
2#-421030
3#-721030
4#-1021030
5#-121045
6#-421045
7#-721045
8#-1021045
9#-121060
10#-421060
11#-721060
12#-1021060
13#-418045
14#-424045
15#-4211030
16#-4211045
17#-4211060
18#2021030
19#2021060
20#2021090
21#-4210150
22#-4210250

Fig.1

Stress-strain relations of samples under different freezing temperatures"

Fig.2

Crack development after the test"

Fig.3

Stress-strain relations of samples under different initial water content"

Fig.4

Stress-strain relations of samples under different freeze-thaw cycle"

Fig.5

Volumetric strain-axial strain relations of samples under frozen temperature"

Fig.6

Stress and volumetric strain-axial strain relations of samples under frozen temperature"

Fig.7

Curve of freezing temperature-elastic modulus of expansive soil"

Fig.8

Damage variable under different working conditions"

Fig.9

Typical stress-strain relations of frozen soil"

Table 2

Statistical damage model parameters of frozen expansive soil"

温度/℃围压/kPaαmF0
-4300.190.431048.36
450.531577.71
600.431313.84
-7300.190.36686.85
450.391002.69
600.401162.08
-10300.200.33817.41
450.35993.12
600.33890.87

Fig.10

Comparison of triaxial test values and model predicted values under different working conditions"

Fig.11

Comparison of different prediction models"

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