Neuner Matthias, Cordes Tobias, Drexel Martin, Hofstetter Günter
Unit for Strength of Materials and Structural Analysis, Institute of Basic Sciences in Engineering Sciences, University of Innsbruck, Technikerstr 13, A-6020 Innsbruck, Austria.
Brenner Basetunnel BBT SE, A-6020 Innsbruck, Austria.
Materials (Basel). 2017 Sep 11;10(9):1067. doi: 10.3390/ma10091067.
A new experimental program, focusing on the evolution of the Young's modulus, uniaxial compressive strength, shrinkage and creep of shotcrete is presented. The laboratory tests are, starting at very young ages of the material, conducted on two different types of specimens sampled at the site of the Brenner Basetunnel. The experimental results are evaluated and compared to other experiments from the literature. In addition, three advanced constitutive models for shotcrete, i.e., the model by Meschke, the model by Schädlich and Schweiger, and the model by Neuner et al., are validated on the basis of the test data, and the capabilities of the models to represent the observed shotcrete behavior are assessed. Hence, the gap between the the outdated experimental data on shotcrete available in the literature on the one hand and the nowadays available advanced shotcrete models, on the other hand, is closed.
本文提出了一个新的实验方案，重点关注喷射混凝土的杨氏模量、单轴抗压强度、收缩和徐变的演变。实验室测试从材料非常早期的龄期开始，对从布伦纳基础隧道现场采集的两种不同类型的试件进行。对实验结果进行了评估，并与文献中的其他实验进行了比较。此外，基于测试数据对三种先进的喷射混凝土本构模型，即梅施克模型、沙德利希和施韦格模型以及诺伊纳等人的模型进行了验证，并评估了这些模型表征所观察到的喷射混凝土行为的能力。因此，一方面弥合了文献中现有关于喷射混凝土的过时实验数据与另一方面当今可用的先进喷射混凝土模型之间的差距。
