›› 2018, Vol. 39 ›› Issue (8): 2715-2722.doi: 10.16285/j.rsm.2016.2784

• Fundamental Theroy and Experimental Research •     Next Articles

The influence of freeze-thaw action on loess collapsibility coefficient considering soil structure

CHOU Ya-ling1, 2, JIA Shu-sheng1, 2, ZHANG Qing-hai1, 2, CAO Wei3, SEHNG Yu3   

  1. 1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Western Engineering Research Center for Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 3. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
  • Received:2016-11-30 Online:2018-08-11 Published:2018-09-02
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51769013).

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Abstract: Structural characteristic is a basic property of loess, and there is a connection between loess collapsibility and its structure. This paper aims at studying how freeze-thaw action affects loess collapsibility with different structural characteristics. A series of collapsibility experiments was performed on artificially structured loess, undisturbed loess and remolded loess, with the use of cement as connection medium among soil particles to prepare artificially structured loess samples. Experimental results show that the collapsibility coefficient of artificially structured loess is less than that of the undisturbed loess and remolded loess before and after freezing-thawing process. The collapsibility coefficient decreases with the increase of cement content. After freezing-thawing, the collapsibility coefficients of most loess samples increase. Especially, for remolded loess and artificially structured loess with low cement content, the increase of collapsibility coefficient is more evident when the water content is close to the optimum water content. Moreover, the increase of collapsibility coefficient is also closely related to the initial structure, water content, dry density and vertical load. Regarding undisturbed loess and remolded loess, a significant negative linear correlation is found between the collapsibility coefficient and unit weight under standard load, 200 kPa. However, for artificially structured loess, it is not the case. Furthermore, for remolded loess and artificially structured loess with 5% cement content, there is a good logarithmic relationship between the collapsibility coefficient and number of freeze-thaw circle under a load of 50 kPa. Also, further research is needed to study whether the original loess can be replaced by artificially structured loess mixed with cement to reflect the collapsibility of structural loess.

Key words: soil mechanics, freeze-thaw action, structural characteristic of loess, collapsibility coefficient

CLC Number: 

  • TU 444

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