Influence of fines content on the anti-frost properties of coarse-grained soil |
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| Authors: | TianLiang Wang ZuRun Yue TieCheng Sun and JinChuang Hua |
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| Institution: | School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministryof Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;Graduate School, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministryof Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministryof Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China |
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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. |
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| Keywords: | freeze and thaw cycle coarse-grained soil fines content strength properties frost heave |
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