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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (5): 1571-1579.DOI: 10.16552/j.cnki.issn1001-1625.2025.1039

• 水泥混凝土 • 上一篇    下一篇

水下桩基混凝土早期强度预测模型及护筒拆除龄期研究

李小庆1(), 王浦1, 方启兴1, 吴鹏1, 田尉军1, 党悦1, 刘金鑫2, 徐湘田2()   

  1. 1.中交路桥华北工程有限公司,北京 101100
    2.内蒙古大学交通学院,呼和浩特 010070
  • 收稿日期:2025-10-28 修订日期:2025-12-19 出版日期:2026-05-15 发布日期:2026-06-10
  • 通信作者: 徐湘田,博士,教授。E-mail: jtxuxt@ imu.edu.cn
  • 作者简介:李小庆(1984—),男,高级工程师。主要从事公路工程方面的研究。E-mail: 657366188@qq.com
  • 基金资助:
    内蒙古自治区科技计划项目(2023YFDZ0032);中交路桥建设有限公司科技研发项目(LJLJHB-PJ2022026190-062623509)

Early Strength Prediction Model of Underwater Pile Foundation Concrete and Demolition Age of Casing

LI Xiaoqing1(), WANG Pu1, FANG Qixing1, WU Peng1, TIAN Weijun1, DANG Yue1, LIU Jinxin2, XU Xiangtian2()   

  1. 1.Road & Bridge North China Engineering Co.,Ltd,Beijing 101100,China
    2.Institute of Transportation,Inner Mongolia University,Hohhot 010070,China
  • Received:2025-10-28 Revised:2025-12-19 Published:2026-05-15 Online:2026-06-10

摘要:

现有检测手段难以检测水下桩基护筒内混凝土实际强度,未能对水下桩基混凝土抗压强度进行准确评估。为揭示水下桩基混凝土的早期抗压强度发展规律,本研究利用自主研发的控温自平衡加压养护装置对水下桩基环境进行模拟,开展了不同自重高度、养护温度、养护龄期对桩基混凝土早期抗压强度的影响试验。结果表明:与标准养护相比,模拟水下养护7 d的混凝土试件抗压强度提高6.56%;养护龄期是影响桩基混凝土早期抗压强度的主要因素,养护温度次之,自重高度影响相对较弱;延长养护龄期能提高养护温度对水下桩基混凝土抗压强度的改善效果;基于成熟度理论建立了水下桩基混凝土早期强度预测模型,预测值与实测值相对误差在7.0%以内,结合平昭高速桂江特大桥工程案例,可将护筒拆除龄期从17 d缩短到5 d。研究结果为水下桩基早期承载力评估与施工决策提供可靠依据。

关键词: 桩基混凝土, 早期抗压强度, 水下养护, 加压养护, 成熟度理论, 预测模型

Abstract:

Existing testing methods are difficult to monitor the actual strength of concrete in underwater pile foundation casing and fail to accurately evaluate the compressive strength of underwater pile foundation concrete. To reveal the early compressive strength development law of underwater pile foundation concrete, this study used the independently developed temperature control and self-balancing pressure curing equipment to simulate the underwater pile foundation condition and conducted the influences of different self-weight heights, curing temperatures and curing ages on the early compressive strength of pile foundation concrete. The results show that, compared with standard curing, the compressive strength of concrete specimens simulated underwater curing for 7 d is increased by 6.56%. Curing age is the main factor affecting the early compressive strength of pile foundation concrete, followed by curing temperature, and the influence of self-weight height is relatively weak. Prolonging the curing age improves the improvement effect of curing temperature on the compressive strength of underwater pile foundation concrete. Based on the maturity theory, a prediction model for the early age strength of underwater pile foundation concrete is established, with the relative error between predicted and measured values within 7.0%. Combined with the engineering case of the Guijiang Grand Bridge on the Pingzhao Expressway, the demolition age of the casing is shortened from 17 d to 5 d. The research results provide a reliable basis for the early bearing capacity evaluation and construction decisions of underwater pile foundation.

Key words: pile foundation concrete, early compressive strength, underwater curing, pressure curing, maturity theory, prediction model

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