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DEM-based numerical study on discharge behavior of EPB-TBM screw conveyor for rock

EPB-TBM 암반굴착시 스크류컨베이어의 배토 거동에 대한 DEM 기반 수치해석적 연구

  • Lee, Gi-Jun (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Kwon, Tae-Hyuk (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Kim, Huntae (R&D Center (TBM Technical Team), Head Office, Energy & Machinery Korea)
  • 이기준 (한국과학기술원 건설 및 환경공학과) ;
  • 권태혁 (한국과학기술원 건설 및 환경공학과) ;
  • 김훈태 (이엠코리아 본사 연구소(TBM기술팀))
  • Received : 2018.11.27
  • Accepted : 2018.12.11
  • Published : 2019.01.31

Abstract

Tunnel construction by TBMs should be supported by the performance of a screw conveyor in order to obtain the optimum penetration rate, so studies related to the screw conveyor performance have been being conducted. Compared to the study on the performance of the screw conveyor for the soil, however, the research on the performance of the screw conveyor for the rock is insufficient. Considering the domestic tunnel sites with more rock layers than soil layers, simulation of discharge of 6 types of rock chips by the screw conveyor was conducted using DEM. Regardless of the shape and volume of the rock chips, the discharge rates of the rock chips by the parallel placed screw conveyor at a speed of 10 RPM in the same rock mass were about 20% (standard deviation: 1.3%) of the maximum volume of discharge rate by the screw conveyor. It is expected that this study can be used as a reference material for screw conveyor design and operation in TBM excavations in rock masses.

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Fig. 1. Simulation of discharge of rock chips by screw conveyor

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Fig. 2. Number of discharged rock chips by DEM simulation

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Fig. 3. Discharge volume of rock chips by DEM simulation

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Fig. 4. Screw conveyor DEM simulation for discharge of rock chip 2 and 6 after 24 seconds

Table 1. Rock chip models

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Table 2. Geometry information

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Table 3. Simulation parameters

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Table 4. Discharged particle rate

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Table 5. Discharge rates of rock chips

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Acknowledgement

Grant : 도심지 소단면(

Supported by : 국토교통과학기술진흥원

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