A study on the evaluation method of compressive strength of TBM segment linings using nondestructive testing

Jee-Hee Jung; Kang-Hyun Lee; Hong Sam Kim; Sung-Min Nam; Jin-Woo Jung

doi:10.9711/KTAJ.2025.27.6.663

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2025 Vol.27, Issue 6 Preview Page Next Page

Technical Paper

A study on the evaluation method of compressive strength of TBM segment linings using nondestructive testing 비파괴 검사를 이용한 TBM 세그먼트 라이닝의 압축강도 평가 방안 연구

30 November 2025. pp. 663-672

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Abstract

In recent years, the demand for underground road construction has increased to alleviate urban traffic congestion and improve land use efficiency. As a result, the application of tunnel boring machine (TBM) tunneling has expanded, particularly in dense urban environments where blasting-based new Austrian tunneling method (NATM) construction is difficult. In TBM tunnels, the precast concrete segment lining directly resists ground and structural loads, making the verification of its mechanical strength and durability essential for overall tunnel safety. However, current on-site quality inspection primarily relies on visual assessment, which has limitations in evaluating structural integrity. This study examined various nondestructive testing (NDT) methods to evaluate the compressive strength of TBM segment linings and selected the mechanical impedance method due to its applicability to high-strength curved concrete segments. Core samples were also extracted from the same segments to perform destructive compressive strength tests, and correlation analysis was conducted. The results showed that the compressive strength correlation at 56 days exhibited the highest coefficient of determination (R² = 0.93). Based on this result, a practical on-site NDT-based compressive strength quality control criterion was proposed.

Keywords

TBM, Segment

Nondestructive testing

Mechanical impedance method

Quality control standard

최근 도심지 교통 혼잡 완화와 지역 단절 해소 등을 위해 도로 지하화 사업이 증가함에 따라 터널 굴착시 TBM (tunnel boring machine) 공법의 적용이 확산되고 있다. TBM 터널에서 세그먼트 라이닝은 지반 하중, 수압 등의 하중을 직접 지지하는 구조적 역할을 수행하기 때문에, 현장 반입 단계에서의 강도 및 건전성 평가는 터널의 장기적 안전성 확보에 매우 중요하다. 그러나 기존 현장 반입 단계에서의 품질관리는 외관 중심의 정성적 검사가 주를 이루고 있어 구조 성능을 정량적으로 확인하기 어렵다는 한계가 있다. 이에 본 연구는 세그먼트 라이닝의 현장 강도 평가를 위해 비파괴검사(기계임피던스법) 방법을 적용하고, 동일 세그먼트에 대해 수행한 코어 공시체 압축강도 시험 결과와의 상관관계 분석을 통해 품질관리기준을 제시하였다. 분석 결과, 재령 56일 선행 압축강도 시험에서 결정계수(R²)가 0.93으로 가장 높은 상관성을 보였으며, 이를 바탕으로 현장 비파괴검사 결과의 압축강도 관리기준을 도출하였다.

키워드

TBM

세그먼트

비파괴검사

기계임피던스법

품질관리기준

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Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 27
No :6
Pages :663-672
Received Date : 2025-11-07
Revised Date : 2025-11-24
Accepted Date : 2025-11-24
DOI :https://doi.org/10.9711/KTAJ.2025.27.6.663

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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