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Experimental study on frost heaving behavior of soil under different loading paths
Abstract Frost heaving behavior of silty clay under different loading paths was experimentally investigated through unidirectional freezing tests in a closed system. The compression progression, freezing process, development of frost heave induced pressure (FHIP), and frost heave progression were observed and analyzed under three different loading paths. Considering the compression of unfrozen soil due to an additional force, experimental results show that frost heaving is a process of coordinated development between FHIP and frost heaving ratio (FHR). The variation trends of each variable under different loading paths are similar during freezing, but frost heaving behavior is different for each loading path. The dependence of FHR on FHIP decreases exponentially, and the effect of loading path on the FHR-FHIP (η−F) relationship decreases with increasing freezing time. The additional force restrains frost heaving by restraining moisture migration within the soil, and high freezing rates have little contribution to frost heave. Loading path has no significant effect on FHIP-constraining rate. FHIP increases exponentially with constraining rate, and F−θ commonly shows a banded distribution forming two edge envelopes, of which L2 is the most secure envelope. The frost heaving behavior under different loading paths presented herein may be used for reference in the designing of foundations to prevent frost heave in cold regions.
Highlights Frost heaving experiments under different loading paths in a closed system were performed; The freezing process, development of frost heave induced pressure (FHIP), and frost heave progression were observed; Compressive deformation of unfrozen soil was taken into account in the analysis of frost heaving; Effect of additional force on soil frost heaving behavior was analyzed; Effects of loading path on FHR−FHIP (η−F) and FHIP-constraining rate (F−θ) were investigated.
Experimental study on frost heaving behavior of soil under different loading paths
Abstract Frost heaving behavior of silty clay under different loading paths was experimentally investigated through unidirectional freezing tests in a closed system. The compression progression, freezing process, development of frost heave induced pressure (FHIP), and frost heave progression were observed and analyzed under three different loading paths. Considering the compression of unfrozen soil due to an additional force, experimental results show that frost heaving is a process of coordinated development between FHIP and frost heaving ratio (FHR). The variation trends of each variable under different loading paths are similar during freezing, but frost heaving behavior is different for each loading path. The dependence of FHR on FHIP decreases exponentially, and the effect of loading path on the FHR-FHIP (η−F) relationship decreases with increasing freezing time. The additional force restrains frost heaving by restraining moisture migration within the soil, and high freezing rates have little contribution to frost heave. Loading path has no significant effect on FHIP-constraining rate. FHIP increases exponentially with constraining rate, and F−θ commonly shows a banded distribution forming two edge envelopes, of which L2 is the most secure envelope. The frost heaving behavior under different loading paths presented herein may be used for reference in the designing of foundations to prevent frost heave in cold regions.
Highlights Frost heaving experiments under different loading paths in a closed system were performed; The freezing process, development of frost heave induced pressure (FHIP), and frost heave progression were observed; Compressive deformation of unfrozen soil was taken into account in the analysis of frost heaving; Effect of additional force on soil frost heaving behavior was analyzed; Effects of loading path on FHR−FHIP (η−F) and FHIP-constraining rate (F−θ) were investigated.
Experimental study on frost heaving behavior of soil under different loading paths
Huang, Long (author) / Sheng, Yu (author) / Wu, Jichun (author) / He, Binbin (author) / Huang, Xubin (author) / Zhang, Xiyan (author)
2019-09-24
Article (Journal)
Electronic Resource
English
Soil , Loading paths , Compression , Frost heaving , FHIP , FHR , Freezing rate , Constraining rate
| Engineering Index Backfile | 1965
Experimental Study on Frost Heaving Force of Natural Ground
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