山区悬索桥隧道锚大体积混凝土温度控制技术  

Temperature Control Technology of Mass Concrete for Tunnel Anchor of Suspension Bridge in Mountainous Area

作　　者：池忠波 CHI Zhong-bo(China Railway Construction Bridge Engineering Bureau Group 1st Engineering Co.,Ltd.,Dalian,Liaoning 116033,China)

机构地区：[1]中铁建大桥工程局集团第一工程有限公司,辽宁大连116033

出　　处：《黑龙江交通科技》2023年第10期97-101,共5页Communications Science and Technology Heilongjiang

摘　　要：隧道锚由于四周围岩封闭,导致散热有限,若未采取有效的温控方案,其巨大温差必将使结构产生裂缝。针对上述问题,以油溪长江大桥为工程背景,对隧道锚的温度控制技术进行了研究。利用有限元软件建立了隧道锚温度场仿真分析模型,通过数值模拟,得出不同浇筑厚度下隧道锚温度场和应力场的变化。结果显示:随着隧道锚浇筑高度的增加,内表温差越大。隧道锚浇筑厚度由4 m变为2 m时,内部最高温度由63.5℃变为53.5℃,最高温度降低了10℃,内表温差由39℃变为23.6℃。相比于隧道锚底部区混凝土而言,中部区的混凝土主要受已硬化混凝土的约束作用,比底部区混凝土所受基岩的约束作用强,故温度应力略高。Because the tunnel anchor is surrounded by rock,the heat dissipation is limited.If no effective temperature control scheme is adopted,the huge temperature difference will cause cracks in the structure.Aiming at the above problems,this paper studies the temperature control technology of Tunnel Anchor Based on the engineering background of Youxi Yangtze River Bridge.The simulation analysis model of tunnel anchor temperature field is established by using finite element software.Through numerical simulation,the changes of tunnel anchor temperature field and stress field under different pouring thickness are obtained.The results show that the inner surface temperature difference increases with the increase of tunnel anchor pouring height.When the pouring thickness of tunnel anchor changes from 4 m to 2 m,the maximum internal temperature changes from 63.5℃to 53.5℃,the maximum temperature decreases by 10℃,and the internal surface temperature difference changes from 39℃to 23.6℃.Compared with the concrete in the bottom area of the tunnel anchor,the concrete in the middle area is mainly restrained by the hardened concrete,which is stronger than that in the bottom area,so the temperature stress is slightly higher.

关 键 词：隧道锚 温度控制 有限元分析 浇筑厚度 

分 类 号：U455[建筑科学—桥梁与隧道工程]