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Sciences in Cold and Arid Regions ›› 2015, Vol. 7 ›› Issue (4): 407-413.doi: 10.3724/SP.J.1226.2015.00407

• ARTICLES • Previous Articles    

Influence of fines content on the anti-frost properties of coarse-grained soil

TianLiang Wang1,2, ZuRun Yue3, TieCheng Sun1,2, JinChuang Hua1,2   

  1. 1. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;
    2. Key Laboratory of Roads and Railway Engineering Safety Control of Ministryof Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;
    3. Graduate School, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
  • Received:2015-02-08 Revised:2015-04-26 Published:2018-11-23
  • Contact: Ph.D., TianLiang Wang, Associate Professor of School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China. Tel: +86-311-87935555; E-mail: wangtl@stdu.edu.cn E-mail:wangtl@stdu.edu.cn
  • Supported by:
    This research was supported by the National Key Technology Support Program of China (No. 2012BAG05B00), the National Natural Science Foundation of China (Nos. 51208320 and 51178281), and the Key Subject of China Railway Corporation (Nos. 2014G003-F and 2014G003-A).

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Abstract: This paper aims to determine the optimal fines content of coarse-grained soil required to simultaneously achieve weaker frost susceptibility and better bearing capacity. We studied the frost susceptibility and strength properties of coarse-grained soil by means of frost heaving tests and static triaxial tests, and the results are as follows:(1) the freezing temperature of coarse-grained soil decreased gradually and then leveled off with incremental increases in the percent content of fines; (2) the fines content proved to be an important factor influencing the frost heave susceptibility and strength properties of coarse-grained soil. With incremental increases in the percent content of fines, the frost heave ratio increased gradually and the cohesion function of fines effectively enhanced the shear strength of coarse-grained soil before freeze-thaw, but the frost susceptibility of fines weakened the shear strength of coarse-grained soil after freeze-thaw; (3) with increasing numbers of freeze-thaw cycles,the shear strength of coarse-grained soil decreased and then stabilized after the ninth freeze-thaw cycle, and therefore the mechanical indexes of the ninth freeze-thaw cycle are recommended for the engineering design values; and (4) considering frost susceptibility and strength properties as a whole, the optimal fines content of 5% is recommended for railway subgrade coarse-grained soil fillings in frozen regions.

Key words: freeze and thaw cycle, coarse-grained soil, fines content, strength properties, frost heave

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