隧道锚锚塞体大体积混凝土温控特性研究
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U443.22

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国家重点发展研究计划发展计划(973)项目(2015CB057702);湖南省教育厅创新平台资助项目(16K005)


Study on temperature-control characteristics of anchor-plug mass concrete
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    摘要:

    为研究锚塞体大体积混凝土温度控制的特点和策略,以太洪长江大桥南岸隧道式锚碇的锚塞体大体积混 凝土施工为工程背景。通过 Midas/FEA 有限元软件进行仿真计算,并开展了工程数据实测,对比分析了隧道锚第 1~4 层施工时的混凝土内部与洞内环境的温度场。研究结果表明:混凝土内部温度实测值与计算值基本吻合。锚 塞体相对封闭施工环境下,大气环境温度可考虑取 0.7~0.9 倍外界环境温度。将锚塞体浇筑厚度将 4 m 改为 2 m 时,混凝土温度峰值降低 1.8 ℃,应力峰值降低 1.06 MPa。混凝土表面对流系数每降低 10 kJ/m2 ?h?℃,温度峰值 增加 1.0 ℃,应力峰值降低 0.35 MPa。锚塞体各层入模温度每升高 5.0 ℃,温度峰值升高 3.0 ℃,应力峰值也会 上升 0.40 MPa。相比于普通水泥,采用中、低热水泥的温度峰值分别降低 4.6 ℃,14.9 ℃,应力峰值降低 0.40, 1.51 MPa。将其应用于后续的锚塞体大体积混凝土的施工温度控制,取得了较好的效果。

    Abstract:

    In order to study the characteristics of the temperature-control of anchor-plug mass concrete and further obtain the temperature-controlling strategy, taking the south anchorage concrete-plug mass concrete of Tai Hong Yangtze River Bridge as engineering background, numerical simulation was conducted by the finite element software Midas/FEA, and the field measurement was also carried out. The temperature field inside concrete and tunnel during the construction process of 1st-4th layers anchorage concrete-plug. The results show that the temperature inside concrete from field monitoring basically agrees with that from simulation. Internal temperature is suggested to be 0.7-0.9 times of atmospheric temperature in relatively closed environment of tunnel anchorage concrete-plug. When the pouring thickness of anchorage concrete is changed to 2 m from 4 m, the peak temperature inside concrete decreases by 1.8 ℃ and the peak stress decreases by 1.06 MPa. When the surface convection coefficient of concrete decreases 10 kJ/m2 ?h?℃, the peak temperature increases by 1.0 ℃, the peak stress decreases by 0.35 MPa. When the molding temperature of each layer increases by 5.0 ℃, the peak temperature increases by 3.0 ℃, the peak stress increases by 0.40 MPa. When the medium or low heat cement is used, the peak temperature respectively decreases by 4.6 ℃ or 14.9 ℃, and the peak stress decreases by 0.40 MPa or 1.51 MPa compared to normal cement. The research results are applied to the temperature control of the anchor-plug mass concrete in later construction, which obtains good effect.

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张玉平,曾旅中,张亚昕,等.隧道锚锚塞体大体积混凝土温控特性研究[J].交通科学与工程,2020,36(3):28-36.
ZHANG Yu-ping, ZENG Lv-zhong, ZHANG Ya-xin, et al. Study on temperature-control characteristics of anchor-plug mass concrete[J]. Journal of Transport Science and Engineering,2020,36(3):28-36.

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  • 在线发布日期: 2022-06-09
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