摘要
沉管隧道现场浇筑过程中由于分层施工浇筑和环境温度等因素易导致沉管表面开裂,如何控制沉管隧道大体积现场浇筑后产生裂缝是亟待解决的技术难题之一。围绕大体积混凝土的现场施工质量控制进行研究和论述。沉管大体积混凝土所达到的最高温度和其出现点位可通过数值模拟获得,并对比数值模拟结果与现场实际监测数据,结果显示:基于Midas FEA的数值模拟可以有效地模拟出沉管大体积混凝土现场实际温度及应力变化情况。通过对其参数化分析,大体积混凝土结构的温度与换热系数之间存在显著的负相关关系,与入模温度及周边温度则是正相关。为了保证大体积混凝土在现场施工过程中的质量,需充分把控入模温度和周边条件,而作用最为显著的是降低其入模温度。
In the process of in-situ concrete pouring for immersed tube tunnels,due to factors such as layered construction,pouring and ambient temperature,the surface of immersed tubes has been easily cracked.How to control the cracks generated after large-volume in-situ pouring of immersed tube tunnels has been a technical problem that needs to be solved urgently at home and abroad.Research and discussion around the quality control of massive concrete on-site construction have been carried out.The maximum temperature reached by the immersed tube massive concrete and its occurrence point can be obtained by numerical simulation,and the numerical simulation results have been compared with the actual monitoring data on site.The results have shown that the numerical simulation based on Midas FEA can effectively simulate the actual temperature and stress changes of the large volume of immersed tube on-situ.Through the parametric analysis,it can be seen from the results that there is a significant negative correlation between the temperature of the mass concrete structure and the heat transfer coefficient,and a positive correlation with the mold temperature and surrounding temperature.In order to ensure the quality of mass concrete in the field construction process,it is necessary to fully control the temperature of the mold entry and the surrounding conditions,and the most significant effect is to reduce the temperature of the mold entry.
作者
林浩
伍浩
卢鉴钧
LIN Hao;WU Hao;LU Jianjun(Guangzhou Panyu Construction Management Co., Ltd., Guangzhou 510030;School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006)
出处
《广东公路交通》
2022年第3期46-52,65,共8页
Guangdong Highway Communications
基金
中铁隧道集团三处有限公司自立项科技项目(编号:2018-02)。
关键词
沉管隧道
大体积混凝土
温度
数值仿真
现场监测
immersed tunnel
massive concrete
temperature
numerical simulation
field monitoring
