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Schematic study on temperature control and crack prevention during spillway tunnel concreting period

机译：泄洪洞混凝土施工期温度控制与防裂的原理研究。

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摘要

Spillway tunnel is regarded as hydraulic thin-slab concrete structure which is subject to easy cracking. Temperature stress during construction period is a major reason causing cracking, and selection of timely and reasonable temperature control schemes can result in good crack prevention effect. The researches have shown that a method combining internal water pipe cooling and surface heat preservation is an effective measure that is able to prevent such cracking, and the selection of heat preservation timing and cooling method of internal water pipe will be the major factor influencing temperature control effect. Aiming at this issue, based on certain spillway tunnel and by virtue of 3D finite elements and water pipe cooling calculation method, simulated calculations and analyses on concrete temperature field and stress field of different temperature control schemes are carried out, and the temperature control effects are brought to comparison. Selected results indicate that good temperature control effect can be obtained under timely and reasonable surface heat preservation and water-flow method. This type of method has reference values on similar projects.
机译：溢洪道隧道被认为是易裂的水工薄板混凝土结构。施工期的温度应力是造成开裂的主要原因，选择及时合理的温度控制方案可以达到良好的防裂效果。研究表明，将内部水管冷却与表面保温相结合的方法是能够防止此类裂纹的有效措施，内部水管的保温时间和冷却方法的选择将是影响温度控制的主要因素。影响。针对该问题，在一定的泄洪洞基础上，借助3D有限元和水管冷却计算方法，对不同温度控制方案的混凝土温度场和应力场进行了模拟计算和分析，得出了温度控制效果。进行比较。选定的结果表明，在及时合理的表面保温和水流方式下可以获得良好的温度控制效果。这种方法在类似项目中具有参考价值。

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  • 来源
    《Materials and structures》 |2015年第11期|3517-3525|共9页
  • 作者

    Wang Zhenhong; Liu Yi; Zhang Guoxin; Hou Wenqian;

  • 作者单位

    China Inst Water Resources & Hydropower Res, Dept Mat & Struct, Beijing 100038, Peoples R China;

    China Inst Water Resources & Hydropower Res, IWHR, Beijing 100038, Peoples R China|China Inst Water Resources & Hydropower Res, Dept Mat & Struct, Beijing 100038, Peoples R China|China Inst Water Resources & Hydropower Res, Basin Water Cycle Simulat & Regulat State Key Lab, Beijing 100038, Peoples R China;

    China Inst Water Resources & Hydropower Res, IWHR, Beijing 100038, Peoples R China|China Inst Water Resources & Hydropower Res, Dept Mat & Struct, Beijing 100038, Peoples R China|China Inst Water Resources & Hydropower Res, Basin Water Cycle Simulat & Regulat State Key Lab, Beijing 100038, Peoples R China;

    China Inst Water Resources & Hydropower Res, Dept Mat & Struct, Beijing 100038, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Spillway tunnel; Temperature control and crack prevention; Water pipe cooling; Simulated calculation; Stress field;

    机译：溢洪道;温度控制与防裂;水管冷却;模拟计算;应力场;

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