Effect of Confining Stress on Pick Cutter Cutting Performance Based on Linear Cutting Tests

Min-Seok Ju; Kang-Min Yoon; Hyun-Sik Kim; Hoyoung Jeong

doi:10.7474/TUS.2026.36.2.188

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2026 Vol.36, Issue 2 Preview Page

Original Article

Effect of Confining Stress on Pick Cutter Cutting Performance Based on Linear Cutting Tests 선형절삭시험에 의한 구속응력이 픽 커터 절삭 거동에 미치는 영향

30 April 2026. pp. 188-205

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Abstract

Recent demand for deep underground space development has increased the importance of understanding mechanical excavation mechanisms that reflect the confining stress conditions of deep rock masses. Although the roadheader is a representative excavation machine capable of free-face excavation, studies on the cutting characteristics of its primary cutting tool, the pick cutter, under confining stress conditions remain limited. In particular, previous studies have mainly focused on TBM disc cutters, making direct application to pick cutters difficult because of differences in cutting principles and rock fragmentation mechanisms. In this study, linear cutting tests were conducted using a roadheader pick cutter under confining stress conditions to investigate cutting characteristics according to confining pressure (0, 5, and 15 MPa) and penetration depth (3, 5, and 7 mm). Average and peak normal and cutting forces, force ratios, and specific energy were analyzed. In addition, sieve analysis of the generated chips was performed to obtain cumulative passing curves and to determine the uniformity coefficient (Cu) and coefficient of curvature (Cc), thereby evaluating particle size distribution characteristics. The results experimentally present the cutting and fragmentation characteristics of roadheader pick cutters under confining stress conditions and provide fundamental data for the design and operational optimization of mechanical excavation methods and for improving performance prediction models for roadheaders in deep underground construction.

Keywords

Pick cutter

LCM Test

Confining stress

Cutting force

최근 고심도 지하공간 개발 수요가 증가함에 따라, 실제 심부 암반의 구속응력 조건을 반영한 기계식 굴착 메커니즘에 대한 이해가 중요해지고 있다. 로드헤더는 자유단면 굴착이 가능한 대표 장비이지만, 주요 절삭 도구인 픽 커터의 구속응력 조건에서의 절삭 특성에 관한 연구는 제한적이다. 특히 기존 연구는 주로 TBM 디스크커터를 대상으로 수행되어, 절삭 원리와 파쇄 메커니즘이 상이한 픽 커터에 직접 적용하기 어렵다. 본 연구에서는 구속응력 조건에서 로드헤더 픽 커터를 이용한 선형절삭시험을 수행하여, 구속압(0, 5, 15 MPa)과 압입깊이(3, 5, 7 mm)에 따른 절삭 특성을 규명하였다. 평균 및 최대 수직하중과 절삭하중, 하중비, 비에너지를 분석하였고, 절삭 칩의 체거름 시험을 통해 누적 통과율 곡선과 균등계수(Cu), 곡률계수(Cc)를 산정하여 입도 특성을 평가하였다. 연구 결과는 구속응력 조건을 고려한 로드헤더 픽 커터의 절삭력 및 파쇄 특성을 실험적으로 제시하며, 고심도 지하공간 개발을 위한 기계식 굴착 공법의 설계 및 운전조건 최적화와 로드헤더 성능 예측 모델 고도화를 위한 기초자료로 활용될 수 있다.

키워드

픽 커터

선형절삭시험

구속압

절삭하중

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Information

Publisher :Korean Society for Rock Mechanics and Rock Engineering
Publisher(Ko) :한국암반공학회
Journal Title :Tunnel and Underground Space
Journal Title(Ko) :터널과 지하공간
Volume : 36
No :2
Pages :188-205
Received Date : 2026-04-09
Revised Date : 2026-04-20
Accepted Date : 2026-04-22
DOI :https://doi.org/10.7474/TUS.2026.36.2.188

Tunnel and Underground SpaceISSN:1225-1275(Print) 2287-1748(Online)한국암반공학회

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