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胡保刚 ，董建辉

 

（ 长沙理工大学 土木工程学院 ，湖南 长沙 410114)

摘   要：明挖隧道厚壁衬砌大体积混凝土厚度在1.0 ~ 1.5  m之间，厚度不同于大跨径桥梁的承台和锚碇,通过研究厚壁衬砌水化热温度场规律，避免其结构产生裂缝。以某 1 . 2 m厚现浇连拱明挖隧道衬砌大体积混凝土为研究对象，通过现场实测温控数据了解其温度场规律，并采用有限元软件Midas Fea 进行温度场模拟，结果吻合良好。利用验证后的有限元模型开展应力分析，提出厚壁衬砌无管冷系统温控施工法，通过控制变量进行数值模拟验证其可靠性。结果表明：厚壁衬砌的水化热温度场温度上升快下降慢，结构整体降温速率平均为  5. 0 ℃/d , 高于 2. 0 ℃/d , 但不会引起结构裂缝；该施工法能够适用于 1 . 2 m 及以下厚度的隧道衬砌施工，对于同等类型的明挖隧道施工具有指导意义。

关键词：大体积混凝土 ；明挖隧道 ；水化热 ；管冷系统 ；温度场 ；应力场

中图分类号：TU528           

文献标志码：A            

文章编号： 1005- 8249  (2024)  05- 0026- 07 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.05 .006

 

HU Baogang ,   DONG Jianhui

(School of Civil Engineering ,   Changsha University of Science & Technology ,   Changsha 410114 ,   China) 

Abstract: The thick-wall lining of mass concrete open-cut tunnel is between 1.0 m~1.5 m,and its thickness is different from that of the pier and anchorage of long-span bridges.By studying the law of hydration heat temperature field of thick-wall lining,cracks can be avoided in its structure.Taking a 1.2 m thick cast-in-place open-cut tunnel lined mass concrete as the research object,the temperature field law was understood through the field measured temperature control data and the finite element software Midas Fea was used to simulate the temperature field.The measured temperature field data was in good agreement with the simulation results.The verified finite element model was used to carry out stress analysis.Based on the measured results and stress field data,the temperature control construction method of the tubular cold system with thick wall lining was proposed,and its reliability was verified by numerical simulation with control variables.The results show that the temperature of hydration heat field of thick-walled lining rises quickly and decreases slowly ,and the overall cooling rate of the structure is 5.0℃/d on average,higher than 2.0℃/d ,but it does not cause structural cracks.The temperature-controlled construction method of pipeless cold system can be applied to the tunnel lining construction with thickness of 1.2 m and below,which has guiding significance for the construction of the same type of open-cut tunnel.

Keywords: mass concrete; open cut tunnel; heat of hydration; pipe cooling system; temperature field; temperature stress.

 

作者简介：胡保刚(1997—), 男，硕士，研究方向： 桥梁与隧道工程结构分析。

收稿日期：2023- 03- 14