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Sciences in Cold and Arid Regions ›› 2020, Vol. 12 ›› Issue (5): 284–294.doi: 10.3724/SP.J.1226.2020.00284.

• • 上一篇    

  

  • 收稿日期:2020-03-10 接受日期:2020-07-06 出版日期:2020-10-31 发布日期:2020-10-29

Calculation of salt-frost heave of sulfate saline soil due to long-term freeze-thaw cycles

Tao Wen1,2,Sai Ying1,3(),FengXi Zhou3   

  1. 1.Chongqing Engineering Research Center of Building Health Monitoring and Disaster Prevention in Full-Life-Cycle, Yangtze Normal University, Chongqing, 408100, China
    2.Gansu Academy of Sciences, Lanzhou, Gansu 730000, China
    3.School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
  • Received:2020-03-10 Accepted:2020-07-06 Online:2020-10-31 Published:2020-10-29
  • Contact: Sai Ying E-mail:yingsai35910@163.com

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Abstract:

Based on salt-frost heave tests of sulfate saline soil under repeated freeze-thaw cycles, this paper discusses the mechanism of the salt-frost heave under long-term freeze-thaw cycles. The results show that the salt-frost heave can be restricted considerably by loads, and there is a critical load for the salt-frost heave cumulative effect. Under this load, peak values of salt-frost heave approach a constant, and the residual values become 0. There is no longer structure heave or cumulative effect of saline soil exposed to freeze-thaw cycles under the critical load. Taking cumulative effect into account in calculations of salt-frost heave, a salt-frost heave model under freeze-thaw cycles is developed.

Key words: sulfate saline soil, freeze-thaw cycles, load, salt-frost heave

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Water contentRelative density (g/cm3)Liquid limit, WLPlastic limit, WpPlasticity index, IpCoefficient of uniformity, Cu=d60/d10
9.3%2.6926.8%17.6%96.87

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Anion content (mg/kg)Cationic content (mg/kg)Soluble salt content (mg/kg)
CO32-HCO3-SO42-Cl-Ca2+Mg2+K++Na+
162323373610826111761

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ItemLoad (kPa)Parameters
a1a2R2
Peak deformation153.2294.2390.993
301.5642.9480.999
600.3702.1460.994
90-0.7431.7800.983
Residual deformation153.2162.1500.983
301.7101.2270.992
600.5930.2860.982
90-0.7190.0890.989

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Times of cyclesParameters
b1b2b3R2
Peak deformation16.579-6.27626.1510.995
312.215-15.28732.6200.998
517.998-21.59922.6710.999
827.992-31.02712.6650.995
Residual deformation14.164-6.33841.0800.999
310.452-14.59028.7610.999
515.174-20.50624.8330.998

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