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Construction method of shield tunnel segment concrete shrinkage prediction model
The invention relates to a construction method of a shield tunnel segment concrete shrinkage prediction model, which comprises the following steps: measuring an actual shrinkage value of concrete through a test, introducing a correction coefficient eta 1 into an ACI (1978) model which does not consider a slump correction coefficient, and comprehensively considering the influence of the mixing amounts of fly ash, slag powder and a shrinkage reducing agent on a final shrinkage value of the concrete; the actual shrinkage value of concrete is measured through a test, a correction coefficient eta2 is introduced into a square root hyperbolic curve type time-history function of a CEB-FIP (1990) model, the influence of the mixing amount of the coal ash, the slag powder and the shrinkage reducing agent on the concrete shrinkage development process is comprehensively considered, and the actual shrinkage value and the correction coefficient eta2 are combined to obtain a shrinkage prediction model of the high-performance concrete doped with the coal ash, the slag powder and the shrinkage reducing agent. By adopting the model, the shrinkage of the low-water-binder-ratio high-strength concrete doped with mineral admixtures and shrinkage reducing agents can be better fitted, the shrinkage process of the shield tunnel segment concrete can be accurately predicted, and a solution is provided for the assembly precision of shield segments and the durability of structure use.
本发明涉及一种盾构隧道管片混凝土收缩预测模型的构建方法，通过试验测量混凝土的实际收缩值对不考虑坍落度修正系数的ACI(1978)模型引入修正系数η1综合考虑粉煤灰、矿渣粉、减缩剂掺量对混凝土收缩终值的影响，通过试验测量混凝土的实际收缩值对CEB‑FIP(1990)模型的平方根双曲线型时程函数引入修正系数η2综合考虑粉煤灰、矿渣粉、减缩剂掺量对混凝土收缩发展过程的影响，将两者结合得到掺有粉煤灰、矿渣粉及减缩剂的高性能混凝土的收缩预测模型。采用该模型能够更好地拟合掺矿物掺合料和减缩剂的低水胶比高强混凝土的收缩，对盾构隧道管片混凝土的收缩过程进行准确预测，为盾构管片装配精度及结构使用的耐久性提供了解决方案。
Construction method of shield tunnel segment concrete shrinkage prediction model
The invention relates to a construction method of a shield tunnel segment concrete shrinkage prediction model, which comprises the following steps: measuring an actual shrinkage value of concrete through a test, introducing a correction coefficient eta 1 into an ACI (1978) model which does not consider a slump correction coefficient, and comprehensively considering the influence of the mixing amounts of fly ash, slag powder and a shrinkage reducing agent on a final shrinkage value of the concrete; the actual shrinkage value of concrete is measured through a test, a correction coefficient eta2 is introduced into a square root hyperbolic curve type time-history function of a CEB-FIP (1990) model, the influence of the mixing amount of the coal ash, the slag powder and the shrinkage reducing agent on the concrete shrinkage development process is comprehensively considered, and the actual shrinkage value and the correction coefficient eta2 are combined to obtain a shrinkage prediction model of the high-performance concrete doped with the coal ash, the slag powder and the shrinkage reducing agent. By adopting the model, the shrinkage of the low-water-binder-ratio high-strength concrete doped with mineral admixtures and shrinkage reducing agents can be better fitted, the shrinkage process of the shield tunnel segment concrete can be accurately predicted, and a solution is provided for the assembly precision of shield segments and the durability of structure use.
本发明涉及一种盾构隧道管片混凝土收缩预测模型的构建方法，通过试验测量混凝土的实际收缩值对不考虑坍落度修正系数的ACI(1978)模型引入修正系数η1综合考虑粉煤灰、矿渣粉、减缩剂掺量对混凝土收缩终值的影响，通过试验测量混凝土的实际收缩值对CEB‑FIP(1990)模型的平方根双曲线型时程函数引入修正系数η2综合考虑粉煤灰、矿渣粉、减缩剂掺量对混凝土收缩发展过程的影响，将两者结合得到掺有粉煤灰、矿渣粉及减缩剂的高性能混凝土的收缩预测模型。采用该模型能够更好地拟合掺矿物掺合料和减缩剂的低水胶比高强混凝土的收缩，对盾构隧道管片混凝土的收缩过程进行准确预测，为盾构管片装配精度及结构使用的耐久性提供了解决方案。
Construction method of shield tunnel segment concrete shrinkage prediction model
一种盾构隧道管片混凝土收缩预测模型的构建方法
WANG XINDING (author) / LI BING (author) / WANG WEIYU (author) / LIU TAN (author) / DAI HONGBO (author)
2021-11-26
Patent
Electronic Resource
Chinese
IPC:
G16C
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