摘要
以重庆东站地下结构混凝土底板工程为例,基于数值热传导理论方法和有限元分析,构建了超大体积混凝土施工温度效应分析的有限元模型及方法,为大体积混凝土浇筑施工控制方案的优选提供客观依据,对于减少大体积混凝土温度裂缝的产生,提升混凝土的抗渗性能,保障结构的安全性和耐久性具有重要意义。基于构建的超大体积混凝土施工温度效应分析有限元模型,探讨了不同水泥品种、混凝土入模温度、混凝土水灰比、环境温度和冷却水管布设等措施对混凝土中心温度的影响规律,为制定经济合理、切实可行的温度裂缝控制方案提供依据,并与施工过程中的实测温度数据进行对比分析,验证有限元分析方法在超大体积混凝土施工温度裂缝控制方案优选中应用的可行性。
Using the Chongqing East Station underground structure concrete slab project as an example,this study employs numerical heat conduction theory and finite element analysis to construct a finite element model and method for analyzing the temperature effects of super⁃large volume concrete construction.This provides an objective basis for optimizing the construction control scheme for mass concrete pouring.It is of great significance in reducing temperature⁃induced cracks in mass concrete,enhancing concrete impermeability,and ensuring the safety and durability of the structure.Based on the constructed finite element model for super⁃large volume concrete construction temperature effects analysis,the study explores the influence of various factors—such as different types of cement,concrete pouring temperature,concrete water⁃cement ratio,ambient temperature,and cooling pipe layout—on the central temperature of concrete.This provides a basis for formulating economical,reasonable,and practical temperature crack control schemes.Furthermore,a comparative analysis is conducted with the measured temperature data from the construction process to verify the feasibility of using finite element analysis for optimizing temperature crack control schemes in super⁃large volume concrete construction.
作者
李海龙
LI Hailong(China Railway Construction Group Co.Ltd.,Beijing 100043,China)
出处
《铁道建筑技术》
2024年第9期32-36,共5页
Railway Construction Technology
基金
中铁建设集团有限公司科研项目(4565QT2024001)。
关键词
超大体积混凝土
施工方案优选
温度裂缝
有限元分析
温度场
super⁃large volume concrete
optimization of construction plan
temperature crack
finite element analysis
temperature field
