大体积混凝土冷却水管布置优化与参数分析  

Optimization and Parameter Analysis of Cooling Water Pipe Layout for Mass Concrete

作　　者：郑豪杰 梁思明 李雁 蒲万里 冯晋豫 戴北冰 ZHENG Haojie;LIANG Siming;LI Yan;PU Wanli;FENG Jinyu;DAI Beibing(School of Civil Engineering,Sun Yat-sen University,Guangzhou 510275,China;Zhuhai Rail Transit Co.Ltd.,Zhuhai Guangdong 519000,China;China Railway Tunnel Group Co.Ltd.,Guangzhou 511458,China)

机构地区：[1]中山大学土木工程学院,广州510275 [2]珠海市轨道交通有限公司,广东珠海519000 [3]中铁隧道局集团有限公司,广州511458

出　　处：《铁道建筑》2025年第3期139-144,共6页Railway Engineering

基　　金：国家自然科学基金(52108263,52078507);广州市科技计划(202002030195)。

摘　　要：大体积混凝土结构现场监测侧重结构温升值和里表温差,而对降温速率重视不足。一旦降温速率控制不当,可能导致早期结构开裂。本文以珠海隧道大体积混凝土底板为对象开展热力耦合分析,对冷却管排列方式进行优化设计,并对冷却水温、水流量、冷却管管径等因素开展敏感性分析。结果表明:当冷却管采取环形或交叉方式布置时,大体积混凝土结构的降温速率均可控制在2℃/d以内。冷却水流量对结构降温效果的影响较为显著,水流量越大温度峰值越低,但降温速率过快会增大结构的最大拉应力,实际施工过程中可在养护初期通大流量冷却水,达到温度峰值后减小冷却水流量。冷却水温的选取也需兼顾降温和拉应力之间的平衡。冷却水管管径对降温效果影响较小,选择内管径为25~30 mm的冷却水管可以兼顾控制成本和保持结构整体性。The on-site monitoring of mass concrete structures focuses on the increase in structural temperature and the temperature difference between the inner and outer surfaces,while the importance of cooling rate is neglected.Once the cooling rate is not properly controlled,it may lead to early structural cracking.This article carried out thermal coupling analysis on the mass concrete floor of Zhuhai Tunnel,optimized and designed the arrangement of cooling pipes,and conducted sensitivity analysis on factors such as cooling water temperature,water flow rate,and cooling pipe diameter.The results indicate that when the cooling pipes are arranged in a circular or intersecting manner,the cooling rate of mass concrete structures can be controlled within 2℃/d.The cooling water flow rate has a significant impact on the cooling effect of the structure.The higher the water flow rate,the lower the temperature peak will be.However,if the cooling rate is too fast,it will increase the maximum tensile stress of the structure.During the actual construction process,a large flow of cooling water can be supplied during the initial maintenance period,and the cooling water flow can be reduced after reaching the temperature peak.The diameter of the cooling water pipe has a relatively small impact on the cooling effect.Choosing a cooling water pipe with an inner diameter of 25~30 mm can balance cost control and maintain structural integrity.

关 键 词：大体积混凝土 数值模拟 温度场 冷却水管 降温速率 热力耦合分析 

分 类 号：U262.33[机械工程—车辆工程] TU528.01[交通运输工程—载运工具运用工程]