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A hybrid solution proposal for precast tunnel segments
Structural Concrete ( IF 3.0 ) Pub Date : 2021-03-24 , DOI: 10.1002/suco.202000629
Ivan Trabucchi 1 , Mario Smarslik 2 , Giuseppe Tiberti 1 , Diego N. Petraroia 2 , Giovanni A. Plizzari 1 , Peter Mark 2
Affiliation  

The construction of underground structures is playing a relevant role in modern society. As a result of noticeable tunnel boring machine (TBM) evolution, mechanized excavation methods are gaining increased market shares. TBM driven tunnels are generally used in combination with precast concrete segments as the main support system for reducing or minimizing surface disturbances during construction and to fulfill the project requirements with regards to quality, construction times, budget and safety. Within this framework optimization approaches strongly focused on these process parameters, rather than the general structural performance of the segments. However, improving the performance by using conventional reinforcement, High Performance Fiber Reinforced Concretes (HPFRCs) or a combination of such enables a possible reduction of the lining thickness or the amount of reinforcement. To this aim, this paper presents a new hybrid solution for precast tunnel segments with a reduced thickness, which leads to new perspectives in reducing the total amount of concrete, in decreasing the volume of disposal materials from the boring process as well as to minimize the TBM size. A parametric numerical study is developed for evaluating the effectiveness of proposed hybrid solution. The latter is based on high strength reinforced concrete in combination with HPFRC at the longitudinal joints, whose geometric configuration is properly modified to maximize the segment's bearing capacity.

中文翻译:

预制隧道管片的混合解决方案

地下结构的建设在现代社会中发挥着重要作用。由于隧道掘进机 (TBM) 的显着发展,机械化挖掘方法的市场份额正在增加。TBM 驱动隧道通常与预制混凝土管片结合使用,作为主要支撑系统,以减少或最大程度地减少施工期间的地表扰动,并满足项目在质量、施工时间、预算和安全方面的要求。在这个框架内,优化方法强烈关注这些工艺参数,而不是段的一般结构性能。然而,通过使用传统的加固来提高性能,高性能纤维增强混凝土 (HPFRC) 或它们的组合可以减少衬里厚度或增强量。为此,本文提出了一种新的混合解决方案,用于减少厚度的预制隧道管片,从而在减少混凝土总量、减少钻孔过程中处理材料的数量以及最大限度地减少TBM 尺寸。开发了一个参数化数值研究来评估所提出的混合解决方案的有效性。后者以高强度钢筋混凝土为基础,在纵向接缝处结合 HPFRC,其几何配置经过适当修改,以最大限度地提高管片的承载能力。本文提出了一种新的混合解决方案,用于减少厚度的预制隧道管片,这为减少混凝土总量、减少钻孔过程中处理材料的体积以及最小化 TBM 尺寸提供了新的视角。开发了一个参数化数值研究来评估所提出的混合解决方案的有效性。后者以高强度钢筋混凝土为基础,在纵向接缝处结合 HPFRC,其几何配置经过适当修改,以最大限度地提高管片的承载能力。本文提出了一种新的混合解决方案,用于减少厚度的预制隧道管片,这为减少混凝土总量、减少钻孔过程中处理材料的体积以及最小化 TBM 尺寸提供了新的视角。开发了一个参数化数值研究来评估所提出的混合解决方案的有效性。后者以高强度钢筋混凝土为基础,在纵向接缝处结合 HPFRC,其几何配置经过适当修改,以最大限度地提高管片的承载能力。开发了一个参数化数值研究来评估所提出的混合解决方案的有效性。后者以高强度钢筋混凝土为基础,在纵向接缝处结合 HPFRC,其几何配置经过适当修改,以最大限度地提高管片的承载能力。开发了一个参数化数值研究来评估所提出的混合解决方案的有效性。后者以高强度钢筋混凝土为基础,在纵向接缝处结合 HPFRC,其几何配置经过适当修改,以最大限度地提高管片的承载能力。
更新日期:2021-03-24
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