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2020 Vol.22, Issue 5 Preview Page

Research Paper

A study on the optimum cutter spacing ratio according to penetration depth using decision tree-based and SVM regressions

의사결정나무 기반 회귀분석과 SVM 회귀분석을 이용한 커터 관입깊이에 따른 최적 커터간격 비 연구

Gi-Jun Lee1*
,
Hee-Hwan Ryu2
,
Tae-Hyuk Kwon3
이 기준1*
,
류 희환2
,
권 태혁3
1Ph.D. Student, Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)
2Senior Researcher, Korea Electric Power Research Institute (KEPRI)
3Associate Professor, Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)
1정회원, 한국과학기술원 건설및환경공학과 박사과정
2정회원, 한국전력연구원 선임연구원
3정회원, 한국과학기술원 건설및환경공학과 부교수
* Corresponding Author
30 September 2020. pp. 201-215
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Abstract

Cutter cutting tests for the cutter placement in the cutter head are being conducted through various studies. Although the cutter spacing at the minimum specific energy is mainly reflected in the cutter head design, since the optimum cutter spacing at the same cutter penetration depth varies depending on the rock conditions, studies on deciding the optimum cutter spacing should be actively conducted. The machine learning techniques such as the decision tree-based regression model and the SVM regression model were applied to predict the optimum cutter spacing ratio for the nonlinear relationship between cutter penetration depth and cutter spacing. Since the decision tree-based methods are greatly influenced by the number of data, SVM regression predicted optimum cutter spacing ratio according to the penetration depth more accurately and it is judged that the SVM regression will be effectively used to decide the cutter spacing when designing the cutter head if a large amount of data of the optimum cutter spacing ratio according to the penetration depth is accumulated.

Keywords
TBM
Cutter spacing
Machine learning
Random forest
SVM

TBM 터널굴착에서 실질적으로 지반을 굴착하는 역할을 하는 부분인 커터헤드 설계 시, 커터 관입깊이와 커터 간격을 달리하여 커터절삭 시험 시 최소 비에너지에서의 커터간격을 반영하고 있으나, 암반 조건에 따라서 동일한 커터 관입깊이에서의 최적 커터간격이 달라지기 때문에 최적 커터간격을 설정하는 연구가 활발히 진행되어야 한다. 이러한 비선형적인 커터 관입깊이와 커터 간격의 관계에서 커터 관입깊이에 따른 최적 커터간격을 예측하기 위해 머신러닝 기법인 의사결정나무 기반 랜덤 포레스트 회귀 모델과 SVM 회귀모델을 이용하여 커터 관입깊이에 따른 최적 커터 간격을 예측하였다. 랜덤 포레스트 분석기법은 SVM 분석기법보다 데이터 개수에 더 큰 영향을 받기 때문에 커터 관입깊이에 따른 최적 커터간격비의 예측에 SVM이 더 정확한 예측을 하였다. 데이터가 많이 축적되면 SVM 회귀모델이 보다 더 정확한 예측값으로 커터헤드 설계 시 커터간격을 설정하는데 효율적으로 사용될 수 있을 것으로 판단된다.

키워드
TBM
커터간격
머신러닝
랜덤 포레스트
SVM
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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 : 22
  • No :5
  • Pages :201-215
  • Received Date : 2020-07-17
  • Revised Date : 2020-08-31
  • Accepted Date : 2020-08-31
  • DOI :https://doi.org/10.9711/KTAJ.2020.22.5.501
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