|Table of Contents|

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

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2016年04期
Page:
104-111
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Early refreezing law of large-diameter cast-in-place piles in permafrost regions
Author(s):
FU Jin JIANG Yu PENG Hui DONG Yuan-hong YUAN Kun
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
Keywords:
bridge engineering permafrost region large-diameter pile foundation pile foundation concrete temperature field observation numerical simulation refreezing law
PACS:
U445.57
DOI:
-
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. 1 tab, 12 figs, 26 refs.

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Last Update: 2016-08-30