地铁车站大体积混凝土结构温度效应

Temperature effect of mass concrete structure in subway station

以成都地铁19号线华兴街站车站底板施工过程为工程背景,采用温度和应变现场监测方法,分析与总结地铁车站底板大体积混凝土结构内部由水化热引起的温度升降变化特征,研究车站底板混凝土中心与表面、表面与大气温度间的温度转换规律;利用ABAQUS有限元软件,建立地铁车站大体积混凝土结构浇筑过程的三维应力场-温度场耦合力学模型,通过与监测数据进行对比验证,得到地铁车站底板、侧墙等不同结构不同位置的温度-应变关系,并对下一步施工采取的温度控制措施提供一些建议。

Based on the construction process of Huaxingjie Station bottom slab of Chengdu Metro Line 19,this paper analyzed and summarized the temperature change characteristics of mass concrete structure of subway station bottom slab caused by hydration heat by using the temperature and strain field monitoring method,and studied the temperature conversion law between the center and surface of station bottom slab concrete,and between the surface and atmospheric temperature;By using ABAQUS finite element software,a three-dimensional stress-temperature coupling mechanical model of mass concrete structure in subway station was established.By comparing with the monitoring data,the temperature strain relationship of different positions of subway station floor,side wall and other structures was obtained,and some suggestions were provided for the next step of construction to take appropriate temperature control measures.