Resilient modulus and cumulative plastic strain of frozen silty clay under dynamic aircraft loading

• Published in: SN applied sciences 2021-10, Vol.3 (10), p.805-12, Article 805
• Main Authors: Liu, Xiaolan, Zhang, Xianmin, Wang, Xiaojiang
• Format: Article
• Language: English
• Subjects: Aircraft; Airport construction; Airports; Applied and Technical Physics; Boundary conditions; Chemistry/Food Science; Clay; Compaction; Compaction degree; Confining; Cumulative plastic strain; Earth Sciences; Empirical equations; Engineering; Environment; Frequency; Frozen ground; Frozen silty clay; Heat conductivity; Materials Science; Moisture content; Permafrost; Plastic deformation; Plastics; Pressure; Research Article; Resilient modulus; Safety management; Segmentation; Soil compaction; Soil temperature; Temperature; Triaxial tests
• ISSN: 2523-3963; 2523-3971
• DOI: 10.1007/s42452-021-04792-1

This paper describes an investigation into the factors influencing the resilient modulus and cumulative plastic strain of frozen silty clay. A series of dynamic triaxial tests are conducted to analyze the influence of the temperature, confining pressure, frequency, and compaction degree on the resilient modulus and cumulative plastic strain of frozen silty clay samples. The results show that when the temperature is below − 5 °C, the resilient modulus decreases linearly, whereas when the temperature is above − 5 °C, the resilient modulus decreases according to a power function. The resilient modulus increases logarithmically when the frequency is less than 2 Hz and increases linearly once the frequency exceeds 2 Hz. The resilient modulus increases as the confining pressure and compaction degree increase. The cumulative plastic strain decreases as the temperature decreases and as the confining pressure, frequency, and compaction degree increase. The research findings provide valuable information for the design, construction, operation, maintenance, safety, and management of airport engineering in frozen soil regions. Article Highlights The empirical equation for resilient modulus and temperature is a segmented function; the segmentation point is − 5 °C. The empirical equation for resilient modulus and frequency is a segmented function; the segmentation point is 2 Hz. The cumulative plastic strain is positively correlated with temperature and negatively correlated with frequency.