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- Title
Numerical analysis of frost heave and thawing settlement of the pile–soil system in degraded permafrost region.
- Authors
Tang, Liyun; Yang, Liujun; Wang, Xiaogang; Yang, Gengshe; Ren, Xiang; Li, Zhen; Li, Guoyu
- Abstract
Climate change in permafrost regions has caused frost heave and thawing settlement of soil around piles, inducing bridge engineering damage. Herein, the solid-to-liquid ratio is used as a hydrothermal coupling term and the frost heave ratio is introduced to establish a pile–soil system frost heave and thawing settlement model. An indoor physical model test is used to confirm the calculation model's correctness. Based on the investigation data of the No. 16 pile of the Chalabing Bridge on the Qinghai–Tibet Plateau, studies on soil temperature and moisture fields as well as frost heave and thawing settlement of the pile–soil system were conducted through the secondary development of partial differential equation (PDE) module in the COMSOL software package. Results show that the permafrost table will degrade from − 3.2 to − 4.9 m with an atmospheric temperature increase of 2.6 °C in the next 50 years. The migration of water to the pile side will increase. Moreover, the thawing settlement amount on the pile side will gradually increase with increasing atmospheric temperature, and the maximum thawing settlement amounts on the pile side in years 1, 10, 30, and 50 will be 4.95, 7.63, 11.58, and 13.66 mm, respectively. Similarly, the frost heave amount will gradually decrease with increasing atmospheric temperature, and the frost heave amounts on the pile side for years 1, 10, 30, and 50 will be 6.66, 5.51, 3.99, and 3.69 mm, respectively. For the stability of pile foundation engineering in permafrost regions in the future, the prevention and control of thawing settlement should be focused.
- Subjects
FROST heaving; TUNDRAS; THAWING; NUMERICAL analysis; PERMAFROST; ATMOSPHERIC temperature
- Publication
Environmental Earth Sciences, 2021, Vol 80, Issue 20, p1
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-021-09999-4