NEW NON-DESTRUCTIVE INSPECTION METHOD WITH GROUND PENETRATING RADAR TO EVALUATE THE SUITABILITY OF THE BACKFILLING GROUTING INJECTION IN TUNNEL BORING MACHINES

Q3 Engineering

Dyna-Colombia Pub Date : 2023-07-01 DOI:10.6036/10822

Catalina MONDRAGON ENGUIDANOS, Amparo VERDU VAZQUEZ, Tomas GIL LOPEZ, Jose HERNANDEZ ALVAREZ, Jorge GOMEZ HOYOS, Luis MENDEZ LANZA

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引用次数: 0

Abstract

This research focuses on the development of a new non-destructive inspection method, based on the interpretation of electromagnetic waves by means of a ground penetration radar (GPR) to evaluate the condition of the backfilling two-component mortar grouting behind the segmental lining in tunnels made by tunnel boring machines (TBM). The data processing by digital models and the analysis of the propagation speed of the along the backfilling grouting layer have enabled the technical and operational feasibility of this novel inspection method. Once the conceptual framework of the research was defined, it was possible to validate the developed method in a full-scale operational environment in the Metro of Quito Line 1 (Ecuador). This validation involved a battery of tests collating the results obtained through the core-drilling extractions in comparison with the ones obtained with GPR. As a result of these calibration tests, it was possible to identify a range of propagation speeds linked to grouting in optimal execution conditions, as well as other ranges associated with potential anomalies. Finally, it was possible to implement this new inspection methodology on a regular basis in the Metro of Quito, where the conventional quality control by core-drillings was replaced almost entirely for the new method with GPR. Keywords: tunnel boring machine (TBM); breaching; mortar; ground penetrating radar; electromagnetic.

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探地雷达无损检测隧道掘进机回填注浆适用性的新方法

本研究的重点是开发一种新的无损检测方法，基于探地雷达（GPR）对电磁波的解释，评估隧道掘进机（TBM）在隧道管片衬砌后回填双组分砂浆灌浆的情况。通过数字模型的数据处理和对回填灌浆层传播速度的分析，证明了这种新型检测方法在技术和操作上的可行性。一旦确定了研究的概念框架，就有可能在基多1号线（厄瓜多尔）地铁的全面运营环境中验证所开发的方法。该验证涉及一系列测试，将通过岩心钻探提取获得的结果与GPR获得的结果进行比较。通过这些校准测试，可以确定在最佳执行条件下与灌浆相关的传播速度范围，以及与潜在异常相关的其他范围。最后，有可能在基多地铁定期实施这种新的检查方法，在那里，通过钻芯进行的传统质量控制几乎完全被GPR的新方法所取代。关键词：隧道掘进机（TBM）；违约；灰浆探地雷达；电磁。

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

Dyna-Colombia 工程技术-工程：综合

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： The DYNA journal, consistent with the aim of disseminating research in engineering, covers all disciplines within the large area of Engineering and Technology (OECD), through research articles, case studies and review articles resulting from work of national and international researchers.