明挖隧道衬砌大体积混凝土水化热温控技术研究  

Hydration Heat Temperature Control Technology of Mass Concrete Lining of Open-cut Tunnel

作　　者：杜彦东 张季超[2] 李瑞祥 林振豪 王亚辉 DU Yandong;ZHANG Jichao;LI Ruixiang;LIN Zhenhao;WANG Yahui(Guangdong Foundation Engineering Group Co.,Ltd.,Guangzhou,Guangdong 510620,China;School of Civil Engineering and Transportation,Guangzhou University,Guangzhou,Guangdong 510006,China)

机构地区：[1]广东省基础工程集团有限公司,广东广州510620 [2]广州大学土木与交通工程学院,广东广州510006

出　　处：《施工技术(中英文)》2024年第24期74-77,共4页Construction Technology

基　　金：广东省重点领域研发计划项目(2020B0101130005);广东电网有限责任公司研究项目(031000QQ00220012)。

摘　　要：明挖隧道衬砌大体积混凝土施工过程中的水化热效应易导致结构的温度应力发生较大变化,进而发展成为对结构有害的温度裂缝。以汕尾工业大道大鹏山隧道施工为工程背景,提出3种温控方案,即分层分缝法、冷却水管法和优化配合比法,通过可操作性、经济性和结构受力等角度并结合衬砌大体积混凝土特点对常用的水化热温控技术进行对比分析,选出分层分缝法和优化配合比法作为施工方案。该方案经济且便利,降温较缓慢,不会产生温度自应力,混凝土徐变可充分释放,产生的拉应力较小,实际施工效果良好。The hydration heat effect in the construction of mass concrete lining of open-cut tunnel is easy to cause the temperature stress of the structure to change greatly,and then develop into temperature cracks which are harmful to itself.Taking the construction of Dapeng Mountain Tunnel on Shanwei Industrial Avenue as the engineering background,this paper proposed three temperature control schemes including layering and slitting method,cooling water pipe method and optimized mix proportion method.The commonly used hydration heat temperature control technologies were compared and analyzed through the perspectives of operability,economy and structural stress,combined with the characteristics of lining mass concrete,the layering and slitting method and the optimized mix proportion method were selected as the construction scheme finally.This scheme was economical and convenient,with slow cooling,no temperature self-stress,and concrete creep could be fully released,resulting in small tensile stress,and good actual construction effect.

关 键 词：隧道 衬砌 大体积混凝土 冷却水管 优化配合比 水化热 温控 

分 类 号：U455[建筑科学—桥梁与隧道工程]