Evaluating frost heave susceptibility of well-graded gravel for HSR subgrade based on orthogonal array testing

Luo, Qiang; Wu, Pingbo; Wang, Tengfei

doi:10.1016/j.trgeo.2019.100283

Cited by 26 publications

(1 citation statement)

References 19 publications

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“…With a continuous understanding of the frost heave mechanism of frozen soil, some scholars began to study the influence of different factors on the frost heave of coarse-grained soil (Konrad, 2008;Du et al, 2014;she et al, 2019). Through laboratory tests, some scholars found that augments with fine particles and clay minerals would improve the frost susceptibility of coarse-grained soil (Vinson et al, 1986;Ye et al, 2007;Xu et al, 2011;Wang and Yue, 2013), and some scholars considered that water content, porosity, negative temperature, dry density, and compaction level affect the frost heave of subgrade (Nie et al, 2013;Wang et al, 2016;Luo et al, 2019). Sheng et al (2014a) found that frost deformation in a closed system may be offset by the consolidation deformation of unfrozen soil based on laboratory test results and that the frost heave mechanism of coarse-grained soil is determined by a combination of multi-factor (Sheng et al, 2014b).…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical investigation on frost heave characteristics of coarse-grained soils under closed and open systems

Huang

Mao

et al. 2022

Front. Earth Sci.

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Coarse-grained soil is widely used in the seasonal frozen soil region as subgrade filler. However, substantial frost heave has been observed in coarse filler in high-speed railway embankments. To investigate the frost heave characteristics of the coarse-grained soil in a deep seasonal frozen soil zone, indoor tests were carried out under water supply and no water supply conditions. The effect of water, fineness, and temperature on frost heave behavior is studied experimentally. The relationship between the freezing rate and frost heave of coarse-grained soils was analyzed. The results show that the freezing process of the filler can be divided into the rapid cooling stage, phase transition stage, slow freezing stage, and freezing stability stage. In the closed system, the increase of the fine-grained soil does not affect the cooling process, while the moisture content significantly affects the whole process. In the opened system, both the fine-grained soil content and the ambient temperature affect the cooling process. When the ambient temperature decreased from −5°C to −15°C, the duration of the phase transition stage decreased by almost 17 h, whereas when the fine-grained soil content increased from 2.7 to 16%, the duration of the phase transition stage increased by only 5 h. In both opened and closed systems, the development of the frost heave is closely related to the cooling process. Approximately 95% of frost heave occurs during the phase transition stage and slow freezing stage. Frost heave develops most rapidly in the phase transition stage, with approximately 85% of the frost heave amount occurring in this stage.

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