摘要
广湛高铁珠三角大型综合交通枢纽项目中某筏形基础厚度为1.5 m,采用强度等级为C40混凝土,属于典型的大体积混凝土现场施工,其产生的水化热效应显著。为深入分析水化热温度效应,研究采用有限元分析软件ABAQUS,引入Hetval子程序精确模拟大体积混凝土水化热过程中的放热行为。分析结果表明,一次性浇筑筏板大体积混凝土会导致结构内外温差过大,增加开裂风险;采用跳仓法可有效控制筏板大体积混凝土结构内外温差,保障结构质量安全。研究结论可为类似工程项目中筏形基础混凝土浇筑过程中的温度控制与裂缝预防提供理论依据。
In the Guangzhan High-Speed Railway Pearl River Delta large-scale comprehensive transportation hub project,a raft foundation with a thickness of 1.5 meters was constructed using C40 concrete,representing a typical large-volume concrete onsite construction characterized by significant heat of hydration effects.To thoroughly analyze the temperature effects of heat of hydration,this study employs the finite element analysis software ABAQUS,incorporating the Hetval subroutine to accurately simulate the exothermic behavior during the hydration process of large-volume concrete.The analysis results indicate that pouring the raft large-volume concrete in a single operation leads to excessive internal and external temperature differences within the structure,increasing the risk of cracking.Conversely,the adoption of the jump casting method effectively controls the internal and external temperature differences in the raft large-volume concrete structure,ensuring structural quality and safety.The conclusions of this thesis provide a theoretical basis for temperature control and crack prevention during the concrete pouring process of raft foundations in this engineering project.
作者
梁春维
张浩东
祁帅
李程飞
乔文涛
Liang Chun-wei;Zhang Hao-dong;Qi Shuai;Li Cheng-fei;Qiao Wen-tao
出处
《建筑技术开发》
2025年第8期113-115,共3页
Building Technology Development
基金
中铁十二局集团有限公司科技计划项目(2024–148)。
关键词
大体积混凝土
跳仓法
水化热
有限元模拟
mass concrete
jump casting construction
heat of hydration
finite element simulation
