Piezoelectric sensing method for segmental joint contact stress during shield tunnel construction

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
Guodong Jiang , Minghao Dai , Guozhu Zhang , Limin Gao
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引用次数: 0

Abstract

The emergence of curved shield tunnels poses a significant construction challenge. If the quality of the segment assembly is not guaranteed, many segment cracks and damage will result from the stress concentration. Sensing the contact stresses between segmental joints is necessary to improve the quality of segments assembled for shield tunnel construction. Polyvinylidene difluoride (PVDF) piezoelectric material was chosen for the sensor because it can convert contact stresses into electrical signals, allowing the state of the segmental joints to be effectively sensed. It matches the working environment between the segmental joints of the shield tunnel, where flexible structures such as rubber gaskets and force transfer pads are present. This study proposes a piezoelectric sensing method for segmental joints in shield tunnels and conducts laboratory tests, numerical analyses, and field tests to validate the feasibility of the method. The results indicate that the PVDF film sensor can effectively sense the entire compression process of the gasket with different amounts of compression. The piezoelectric cable sensor can effectively sense the joint offset direction of the gasket. For differently shaped sections, the variation in the force sensed by the piezoelectric cable sensors was different, as verified by numerical simulation. Through the field test, it was found that the average contact stress between the segmental joints was in the range of 1.2–1.8 MPa during construction of the curved shield tunnels. The location of the segmental joints and the type of segment affect the contact stress value. The field monitoring results show that piezoelectric sensing technology can be successfully applied during assembly of the segments for effective sensing of the contact stress.

盾构隧道施工过程中分段接头接触应力的压电传感方法
曲线盾构隧道的出现给施工带来了巨大挑战。如果分段组装的质量得不到保证,应力集中将导致许多分段裂缝和损坏。要提高盾构隧道施工中分段组装的质量,就必须感知分段接头之间的接触应力。之所以选择聚偏二氟乙烯(PVDF)压电材料作为传感器,是因为它可以将接触应力转化为电信号,从而有效地感知分段接头的状态。它与盾构隧道分段接头之间的工作环境相匹配,因为隧道分段接头之间存在橡胶垫片和力传递垫等柔性结构。本研究提出了一种用于盾构隧道分段接头的压电传感方法,并通过实验室测试、数值分析和现场测试验证了该方法的可行性。结果表明,PVDF 薄膜传感器可有效感知垫片在不同压缩量下的整个压缩过程。压电线缆传感器能有效感知垫片的连接偏移方向。对于不同形状的截面,压电线缆传感器感应到的力的变化是不同的,这一点已通过数值模拟得到验证。通过现场测试发现,在曲线盾构隧道施工过程中,分段接头之间的平均接触应力在 1.2-1.8 兆帕之间。分段接头的位置和分段类型会影响接触应力值。现场监测结果表明,压电传感技术可在分段组装过程中成功应用,从而有效传感接触应力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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