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Sciences in Cold and Arid Regions ›› 2021, Vol. 13 ›› Issue (5): 440-449.doi: 10.3724/SP.J.1226.2021.21031.

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Strength characteristics and energy dissipation evolution of thawing silty clay during cyclic triaxial loading

HongHuan Cui1,2,BoYuan Shao2,XiaoWen Han2   

  1. 1.Hebei Provincial Key Laboratory of Civil Engineering Diagnosis, Reconstruction and Disaster Resistance, Zhangjiakou, Heibei 075000, China
    2.Hebei University of Architecture, Zhangjiakou, Hebei 075000, China
  • Received:2021-05-03 Accepted:2021-10-14 Online:2021-10-31 Published:2021-12-03
  • Contact: HongHuan Cui

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Abstract:

Cyclic triaxial tests are conducted to analyze the evolution of strength parameters and energy dissipation of thawing silty clay under different stress paths.The effects of freezing temperature, thawing temperature and confining pressures on the stress-strain and strength characteristics of soil samples are studied through monotonic loading and cyclic loading tests by using high- and low-temperature triaxial apparatus. The variation of the total work, elastic deformation energy, dissipated energy, energy dissipation rate, residual strain, and damage variable during loading and unloading are discussed. The experimental results show that the samples have higher strain tolerance under high confining pressure, low freezing temperature, and low thawing temperature, and the same other conditions. The soil sample state and failure pattern can be judged by using the energy parameters measured in the experiment.

Key words: thawing soil, stress-strain relationship, triaxial cyclic loading and unloading, energy dissipation

Table 1

Soil sample grain size distribution"

Particle size (mm)Percentage by weight
2-11.5%
1-0.511.34%
0.5-0.2526.61%
0.25-0.07533.74%
<0.07526.19%

Table 2

Soil sample index properties"

Liquid limitPlastic limitPlastic indexOptimum moisture contentMaximum dry density (g/cm)
29%16%1312%1.94

Figure 1

View of the TKA-TTS-10D triaxial apparatus with temperature control"

Figure 2

A typical stress-strain curve of repeated loading and unloading test"

Figure 3

Initial peak stress corresponding to different freezing temperature and confining pressure under 6 ℃ thawing temperature"

Figure 4

Peak stress vs. testing cycles for samples subject to various freezing temperatures and the same thawing temperature of 6 ℃ and confining pressure of 80 kPa"

Figure 5

Variation of elastic modulus vs. the number of loading cycles under different confining pressures for the freezing temperature of -15 °C and thawing temperature 6 °C"

Figure 6

Variation of elastic modulus under thawing temperature of 6 °C and various freezing temperatures and confining pressures. (a) Confining pressure of 20 kPa; (b) Confining pressure of 50 kPa; (c) Confining pressure of 80 kPa"

Figure 7

Typical hysteresis loop curve"

Table 3

Variation of different energy parameters at loading and unloading stages during cyclic tests (to be continued)"

T (℃)P (kPa)C

U

(×10-3 J/m3)

U d

(×10-3 J/m3)

U e

(×10-3 J/m3)

K
-5201335.211135.551199.6600.404
2981.210684.970296.2400.698
31,220.994917.089303.9050.751
41,682.9411,366.435316.5060.812
51,659.6291,357.575302.0540.818
61,590.9811,318.081272.9000.828
501398.013137.586260.4270.346
21,317.72829.711488.0090.630
31,655.0611,199.793455.2680.725
42,268.5911,768.966499.6250.780
52,352.4911,848.990503.5010.786
62,327.2671,848.410478.8570.794
801417.714135.074282.6400.323
21,389.331857.459531.8720.617
31,740.6381,254.800485.8380.721
42,343.2521,814.630528.6220.774
52,476.3791,927.542548.8370.778
62,485.7621,956.329529.4330.787
-10201407.899140.965266.9340.346
21,281.174892.122389.0520.696
31,245.984937.740308.2440.753
41,636.7101,333.224303.4860.815
51,579.4141,297.313282.1010.821
61,530.6991,273.843256.8560.832
501390.801115.569275.2320.296
21,527.357748.632778.7250.490
32,255.2071,568.724686.4830.696
42,630.8402,086.230544.6100.793
52,279.9331,827.047452.8860.801
62,134.3621,695.933438.4290.795
801413.267133.544279.7230.323
21,521.450829.356692.0940.545
32,072.5701,460.537612.0330.705
42,602.4242,027.628574.7960.779
52,618.1072,014.719603.3880.770
62,742.7142,136.308606.4060.779
-15201421.638129.157292.4810.306
21,427.425950.844476.5810.666
31,390.9171,047.932342.9850.753
41,703.8301,404.001299.8290.824
51,603.7891,334.658269.1310.832
61,468.5721,230.828237.7440.838
501436.576115.138321.4380.264
21,719.883857.761862.1220.499
32,423.2001,778.707644.4930.734
42,442.3331,937.983504.3500.793
52,291.7631,822.756469.0070.795
62,284.5311,820.024464.5070.797
801455.094115.019340.0750.253
21,757.593907.034850.5590.516
32,350.4871,653.442697.0450.703
42,794.7562,161.962632.7940.774
52,891.4572,192.248699.2090.758
62,989.5752232.810756.7650.747

Figure 8

Relationships between energy parameters and number of cycles"

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