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桩基础广泛应用于多年冻土地区,桩基施工带进多年冻土地基的热量,在自然传导过程中传给周围的多年冻土,使桩周一定范围内的多年冻土升温,冻土融化。桩周融土在冻土环境作用下逐渐冷却,进而恢复冻结状态,冻结承载力形成。这一过程需要的时间,控制着多年冻土区桥梁桩基及整个桥梁的施工工期,也是合理安排施工工期的重要依据,文中以直径1.2 m的桩基为研究实体工程,通过观测与有限元分析,对多年冻土区桩基回冻时间进行了探讨。
Pile foundation is widely used in permafrost areas, pile foundation construction into the permafrost foundation heat, during the natural transmission to the surrounding permafrost, so that the perimeter of a certain range of permafrost temperature, permafrost melting . The soil around the pile gradually cooled under the effect of permafrost so as to restore the frozen state and form the frozen bearing capacity. The time required for this process controls the construction period of the bridge pile foundation and the entire bridge in permafrost regions. It is also an important basis for rational arrangement of the construction period. In this paper, pile foundation with a diameter of 1.2 m is studied as a physical entity. Through observation and finite element analysis Analysis, the permafrost piles in the freezing time.