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2019 Vol.29, Issue 6 Preview Page

Case Study

Evaluation of Screw Conveyor Model Performance depending on the Inclined Angle by Discrete Element Method

개별요소법을 활용한 경사각에 따른 스크루 컨베이어 모델 성능 평가

Byungkwan Park1
,
Soon-Wook Choi2
,
Chulho Lee3*
,
Tae-Ho Kang4
,
Soo-Ho Chang5
박 병관1
,
최 순욱2
,
이 철호3*
,
강 태호4
,
장 수호5
1Graduate Student, Civil & Environmental Engineering, University of Science and Technology
2Senior Researcher, Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology
3Senior Researcher, Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology
4Senior Researcher, Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology
5Senior Research Fellow, Construction Industry Promotion Department, Korea Institute of Civil Engineering and Building Technology
1과학기술연합대학원대학교 건설환경공학과 박사과정 학생연구원
2한국건설기술연구원 인프라안전연구본부 수석연구원
3한국건설기술연구원 인프라안전연구본부 수석연구원
4한국건설기술연구원 인프라안전연구본부 수석연구원
5한국건설기술연구원 건설산업진흥본부 선임연구위원
* Corresponding Author
31 December 2019. pp. 379-393
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Abstract

For the economical construction of a tunnel by TBM, the selection of TBM optimized with the various project conditions is important, and also necessary to predict the performances of selected TBM in advance. This study was conducted to comprehensively evaluate the performance of the EPB shield TBM screw conveyor by the discrete element method. The sticky particles were used for the excavated material models, and screw conveyor with 11 different inclined angles were simulated to evaluate the performance depending on the different inclined angles. The four different rotational speed conditions of the screw were used, and torque, required power, extra energy for muck discharge, and the muck discharge rate were selected as four performance indicators. As a result, the optimized inclined angle was selected, and selected angle accords with the fact that EPB shield TBM screw conveyor is generally installed and adjusted at the inclined angle between 20.0° and 30.0° in the field.

Keywords
EPB shield TBM
Optimized screw conveyor
Inclined angle
DEM
Performance evaluation

경제적인 TBM 시공을 위해서는 현장 조건에 맞는 최적의 TBM 선정과 함께, 선정된 TBM의 굴착 성능을 예측하는 것이 매우 중요하다. 본 연구에서는 개별요소법 (Discrete Element Method, DEM) 기법에 근거한 입자 역학 전용 해석 상용 소프트웨어를 사용하여 경사각에 따른 토압식 쉴드TBM의 버럭 배토 장비인 스크루 컨베이어의 각도에 따른 성능을 종합적으로 평가하였다. 굴착 토사를 모사하기 위해 점성 특성을 갖는 입자들을 사용하였으며, 스크루 컨베이어의 경사각에 따른 성능을 평가하기 위해 11가지 스크루 컨베이어 모델을 적용하였다. 해석에는 네 가지 스크루 컨베이어 회전 속도 조건이 적용되었으며 스크루 컨베이어의 성능을 평가하기 위한 지표로 토크, 소요 동력 이외에도 배토를 위해 추가로 소요되는 작업량 및 단위 시간당 배토량을 선정하였다. 마지막으로 평가된 네 가지 성능 지표를 종합하여 주어진 해석 조건에서의 최적의 스크루 컨베이어 경사각을 선정하였으며, 이는 실제 TBM 현장에서 많이 사용되는 스크루 컨베이어 경사인 20.0°~30.0° 범위와도 부합하는 것으로 파악되었다.

키워드
토압식 쉴드TBM
최적의 스크루 컨베이어
경사각
개별요소법
성능 평가
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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 : 29
  • No :6
  • Pages :379-393
  • Received Date : 2019-11-11
  • Revised Date : 2019-11-27
  • Accepted Date : 2019-11-27
  • DOI :https://doi.org/10.7474/TUS.2019.29.6.379
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