Numerical Analysis of EPB TBM Driving using Coupled DEM-FDMPart Ⅱ: Parametric Study

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

doi:10.7474/TUS.2020.30.5.496

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2020 Vol.30, Issue 5 Preview Page

Original Article

Numerical Analysis of EPB TBM Driving using Coupled DEM-FDMPart Ⅱ: Parametric Study 개별요소법과 유한차분법 연계 해석을 이용한 EPB TBM 굴진해석 Part Ⅱ: 매개변수 해석

31 October 2020. pp. 496-507

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Abstract

A prediction of the performance of EPB TBM is significant for improving the constructability of tunnels. Thus, various attempts to simulate TBM excavation by the numerical method have been made until these days. In this paper, to evaluate the performance of TBM with different operating conditions, a parametric study was carried out using coupled discrete element method (DEM) and finite difference method (FDM) EPB TBM driving model. The analysis was conducted by changing the penetration rate (0.5 and 1.0 mm/sec) and the rotational speed of screw conveyor (5, 15, and 25 rpm) while the rotation velocity of the cutter head kept constant at 2 rpm. The torque, thrust force, chamber pressure, and discharging with different TBM operating conditions were compared. The result of parametric study shows that the optimum driving condition can be determined by the coupled DEM-FDM numerical model.

Keywords

Coupled Numerical Analysis

Discrete Element Method

EPB Shield

Finite Difference Method

TBM

EPB TBM의 굴진성능 예측은 터널 시공성 향상을 위해 매우 중요하며, 따라서 현재까지 TBM 굴진을 수치해석적으로 모사하기 위한 다양한 시도들이 이루어져 왔다. 본 논문에서는 EPB TBM의 운전조건에 따른 굴진성능을 평가하기 위해 개별요소법(DEM, discrete element method)과 유한차분법(FDM, finite difference method)을 연계한 수치해석 모델을 사용하여 운전조건을 변경해가며 매개변수 해석을 수행하였다. 해석은 커터헤드의 회전속도를 2 rpm으로 일정하게 유지한 상태에서 굴진속도를 0.5, 1.0 mm/sec, 스크류 컨베이어의 회전속도를 5, 15, 25 rpm으로 조건을 변경해가며 수행되었다. 운전조건의 변화에 따라 측정되는 토크, 추력, 챔버압, 배토량을 비교하였으며 매개변수 해석 결과를 통해 개별요소법-유한차분법 연계 TBM 굴진해석 모델을 사용하여 최적 TBM 운전조건을 예측할 수 있음을 나타냈다.

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 :496-507
DOI :https://doi.org/10.7474/TUS.2020.30.5.496

Tunnel and Underground Space ISSN:1225-1275(Print) 2287-1748(Online) 터널과 지하공간

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