Abstract
Using a new low-temperature dynamic triaxial apparatus, the influence law of freezing-thawing cycles on clay shear strength is studied. In this research, the concept of correction coefficients of freezing-thawing cycles on clay static strength, cohesion and internal friction angles is proposed, and the change patterns, correction curves and regressive formulae of clay static strength, cohesion and internal friction angles under freezing-thawing cycles are given. The test results indicate that with increasing numbers of freezing-thawing cycles, the clay static strength and cohesion decrease exponentially but the internal friction angle increases exponentially. The performance of static strength, cohesion and internal friction angles are different with increasing numbers of freezing-thawing cycles, i.e., the static strength decreases constantly until about 30% of the initial static strength prior to the freezing-thawing cycling and then stays basically stable. After 5–7 freezing-thawing cycles, the cohesion decreases gradually to about 70% of the initial cohesion. The internal friction angle increases about 20% after the first freezing-thawing cycle, then increases gradually close to a stable value which is an increase of about 40% of the internal friction angle. The freezing-thawing process can increase the variation of the density of the soil samples; therefore, strict density discreteness standards of frozen soil sample preparation should be established to ensure the reliability of the test results.
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Acknowledgement
This work is financially supported by the Scientific Research Fund of the Institute of Engineering Mechanics, China Earthquake Administration (2018D12), National Natural Science Foundation of Heilongjiang Province (E 2016045) and National Natural Science Foundation of China (No. 51378164; 51508140). These sponsors are gratefully acknowledged.
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Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration under Grant No. 2018D12; National Natural Science Foundation of Heilongjiang Province under Grant No. E 2016045 and National Natural Science Foundation of China under Grant No. 51378164; 51508140
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Wang, M., Meng, S., Sun, Y. et al. Shear strength of frozen clay under freezing-thawing cycles using triaxial tests. Earthq. Eng. Eng. Vib. 17, 761–769 (2018). https://doi.org/10.1007/s11803-018-0474-5
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DOI: https://doi.org/10.1007/s11803-018-0474-5