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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2016  >  16(4): 104-111
FU Jin, JIANG Yu, PENG Hui, DONG Yuan-hong, YUAN Kun. Early refreezing law of large-diameter cast-in-place piles in permafrost regions[J]. Journal of Traffic and Transportation Engineering, 2016, 16(4): 104-111. doi: 10.19818/j.cnki.1671-1637.2016.04.011
Citation: FU Jin, JIANG Yu, PENG Hui, DONG Yuan-hong, YUAN Kun. Early refreezing law of large-diameter cast-in-place piles in permafrost regions[J]. Journal of Traffic and Transportation Engineering, 2016, 16(4): 104-111. doi: 10.19818/j.cnki.1671-1637.2016.04.011
shu

Early refreezing law of large-diameter cast-in-place piles in permafrost regions

doi: 10.19818/j.cnki.1671-1637.2016.04.011

  • State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions, CCCC First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China

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  • Author Bio:

    FU Jin(1982-), male, senior engineer, +86-29-88853000, fujin25@126.com

  • Received Date: 2016-05-11
  • Publish Date: 2016-08-25
    Abstract
  • Based on the design and construction of pile foundation concrete in permafrost regions, the early refreezing law of large-diameter cast-in-place pile in permafrost regions was studied. Through pile filed test and numerical simulation model, the hydrate heat of concrete and the permafrost refreezing law around pile were analyzed. Analysis result shows that pile side temperature is above 1 ℃ within 25 d after finishing pouring, and gradually recovers to 0 ℃ in 45 d after finishing pouring. Numerical simulation result shows that the pile temperature decreases to 0 ℃in 60 d after finishing pouring. The soil mass around pile is refrozen to natural state in 200 d after finishing pouring. Every 2 ℃ increase of molding temperature results in 1 ℃ increase of peak temperature at pile side and 0.5 ℃ increase of peak temperature at two times of pile diameters away. For large-diameter pile foundation, the addition of hardening accelerator to pile foundation concrete can be avoided or decreased. It is not necessary to sedulously decrease the molding temperature of mixture. The best construction time of pile foundation is in warm seasons, which can provide a good external condition for concrete curing.

     

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