Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (5): 1531-1538.doi: 10.13229/j.cnki.jdxbgxb20180257

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Effects of freeze-thaw cycles on mechanical properties of silty sand and subgrade slope stability

Yun-long ZHANG1(),Liu-guang ZHOU1,2,Jing WANG1,Chun-li WU3(),Xiang LYU3   

  1. 1. School of Transportation Science, Jilin Jianzhu University, Changchun 130118, China
    2. Jiangsu Dong Dao Transportation Science & Technology Group，Nanjing 210011，China 3. College of Transportation, Jilin University, Changchun 130022, China
  • Received:2018-03-22 Online:2019-09-01 Published:2019-09-11
  • Contact: Chun-li WU E-mail:zyl_ql@qq.com;clwu@jlu.edu.cn

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Abstract:

In order to study the mechanical properties of silty subgrade and the silt subgrade slope stability under the freeze-thaw cycles, the static triaxial test was conducted with different water contents to study the variation law of the cohesion and the internal friction angle of silty sand after different numbers of freeze-thaw cycles in seasonally frozen area. The influences of freeze-thaw cycle on silt subgrade slope stability coefficient of the different slopes and different fill heights were analyzed by the finite element numerical model based on the test results. The results show that the influence of freeze-thaw cycle on cohesion of silty sand is gradually enhanced with the increase in water content, the cohesion can be reduced 70%-80% when the water content is large. The internal friction angle decreases firstly and then increases slightly with the increase in the number of freeze-thaw cycles, the influence of freeze-thaw cycles on the internal friction angle of silty sand is weakened with the increase in water content. The silt subgrade slope stability coefficient is decreased by the freeze-thaw cycles and the largest decrease after freeze-thaw cycles can reach 49% of stability coefficient without freeze-thaw cycles. The maximum fill height of silt subgrade should not exceed 4 meters in seasonally frozen area. If the subgrade fill height is less than 3 meters, the limit slope should not be steeper than 1∶1.5. If the fill height is more than 3 meters, the limit slope should not exceed 1∶2.5.

Key words: road engineering, slope stability, test and model, silt subgrade, shear strength parameters, freeze-thaw cycles

CLC Number: 

  • U416.1

Fig.1

Particle grading curve of sample"

Fig.2

Samples for triaxial test"

Fig.3

Automatic triaxial instrument"

Fig.4

Effect of freeze-thaw cycles on cohesion"

Fig.5

Effect of freeze-thaw cycles on internal friction angle"

Fig.6

Shear strength of sample under different confining pressures"

Fig.7

General structure of subgrade"

Fig.8

Subgrade after freezing and thawing"

Fig.9

ANSYS numerical model of subgrade"

Fig.10

Critical state before subgrade slope instability"

Fig.11

Subgrade slope stability coefficient without freezing"

Fig.12

Effect of freeze-thaw cycles on subgrade height"

Fig.13

Effect of freeze-thaw cycles on subgrade slope"

Fig.14

Effect of freeze-thaw cycles on subgrade ultimate height"

Fig.15

Effect of freeze-thaw cycles on subgrade ultimate slope"

Fig.16

Subgrade ultimate slope according to different subgrade height"

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