Numerical Analysis of EPB TBM Driving using Coupled DEM-FDMPart Ⅰ: Modeling

Soon-wook Choi; Hyobum Lee; Hangseok Choi; Soo-Ho Chang; Tae-Ho Kang; Chulho Lee

doi:10.7474/TUS.2020.30.5.484

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2020 Vol.30, Issue 5 Preview Page Next Page

Original Article

Numerical Analysis of EPB TBM Driving using Coupled DEM-FDMPart Ⅰ: Modeling 개별요소법과 유한차분법 연계 해석을 이용한 EPB TBM 굴진해석 Part Ⅰ: 모델링

31 October 2020. pp. 484-495

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Abstract

To numerically simulate the advance of EPB TBM, various type of numerical analysis methods have been adopted including discrete element method (DEM), finite element method (FEM), and finite difference method (FDM). In this paper, an EPB TBM driving model was proposed by using coupled DEM-FDM. In the numerical model, DEM was applied in the TBM excavation area, and contact properties of particles were calibrated by a series of triaxial tests. Since the ground around the excavation area was coupled with FDM, the horizontal stress considering the coefficient of earth pressure at rest could be applied. Also, the number of required particles was reduced and the efficiency of the analysis was increased. The proposed model can control the advance rate and rotational speed of the cutter head and screw conveyor, and derive the torque, thrust force, chamber pressure, and discharging during TBM tunnelling.

Keywords

Coupled Numerical Analysis

Discrete Element Method

EPB Shield

Finite Difference Method

TBM

EPB TBM의 굴진을 수치적으로 해석하기 위해 개별요소법(DEM, discrete element method), 유한요소법(FEM, finite element method), 유한차분법(FDM, finite difference method) 등과 같은 다양한 수치해석 기법이 적용되어 왔다. 본 논문에서는 이중 개별요소법과 유한차분법을 연계하는 방식을 채택하여 EPB TBM 굴진해석 모델링 방법을 제시하였다. 제시한 개별요소법-유한차분법 연계 TBM 굴진해석 모델에서 TBM이 굴착하는 굴착부는 개별요소법을 적용하였으며, 입자 접촉 물성치의 경우 일련의 삼축압축시험을 통해 교정하였다. 굴착부 주변지반은 유한차분법을 연계시켜 정지토압계수를 고려하여 굴착부에 수평지중응력을 구현할 수 있도록 하였다. 또한, 이를 통해 소요 입자 개수를 감소시켜 모델의 해석효율을 증대시켰다. 본 논문에서 제시한 수치해석 모델은 TBM의 굴진율, 커터헤드 및 스크류 컨베이어 회전속도 등을 조절할 수 있으며 TBM 굴진 중 토크, 추력, 챔버압, 배토량을 도출해 낼 수 있다.

키워드

EPB 쉴드

TBM

개별요소법

연계해석법

유한차분법

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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 : 30
No :5
Pages :484-495
DOI :https://doi.org/10.7474/TUS.2020.30.5.484

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

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