岩土工程学报2025，Vol.47Issue(7)：1382-1391,10.DOI:10.11779/CJGE20240657
锥形桩冻拔特性多因素影响规律及抗拔机理研究
Multifactorial influence patterns and resistance mechanisms of frost-jacking characteristics in conical piles
摘要
Abstract
To investigate their evolution characteristics of frost-jacking behavior and their resistance mechanisms,a testing device for the anti-frost-jacking performance of conical piles is developed.The unidirectional freezing tests on the conical piles are conducted to analyze the effects of pile materials,cone angles,soil moisture contents around the piles and freeze-thaw cycles on their frost-jacking performance as well as their anti-frost-jacking mechanisms.It is indicated that under the same conditions,the frost-jacking displacement of the piles decreases exponentially with the increase in the cone angles.As the number of freeze-thaw cycles increases,the growth rate of the frost-jacking displacement for vertical piles increases in a semi-logarithmic manner,while changes in the conical piles are not significant.The pile materials have a significant impact on the frost-jacking characteristics of the conical piles,and the wooden pile may experience thawing extraction.During the unidirectional freezing process,the moisture within the soil surrounding the piles migrates upward from the bottom.The greater the initial moisture contents,the more pronounced the migration,leading to larger frost-jacking displacements.However,the effects of the moisture contents on the frost-jacking displacement are weaker than those of the cone angles.During the freezing process of the soil around the piles,the freezing depth increases,the tangential frost-jacking force on the pile surface increases,and the normal frost jacking force gradually decreases from compressive stress to tensile one.When these two forces exceed the tangential freezing strength of the soil and the ultimate normal tensile strength,the frost-jacking of the piles occurs.Considering the resistance to frost jacking,economic factors and the protection of frozen soil,the cone angles of the anti-frost-jacking conical piles should be designed to be between 7° and 9°,but the pile depth must also be taken into account.关键词
冻土区/锥形桩/冻拔机理/锥角设计Key words
frozen soil region/conical pile/frost-jacking mechanism/conical angle design分类
建筑与水利引用本文复制引用
杨志浩,程世奥,岳祖润,冯怀平,赵得杰,马德良,李同海..锥形桩冻拔特性多因素影响规律及抗拔机理研究[J].岩土工程学报,2025,47(7):1382-1391,10.基金项目
国家自然科学基金项目(52302518) （52302518）
河北省自然科学基金项目(E2023210054) （E2023210054）
石家庄市驻冀高校基础研究优青项目(241790557A) （241790557A）
河北省高等学校科学研究项目(CXZX2025005)This work was supported by the National Natural Science Foundation of China(Grant No.52302518),the Natural Science Foundation of Hebei Provence(Grant No.E2023210054),the Shijiazhuang City Outstanding Youth Project for Basic Research in Hebei Province Universities(Grant No.241790557A),and the Science and Technology Project of Hebei Education Department(Grant No.CXZX2025005). （CXZX2025005）
