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Development of testing apparatus and fundamental study for performance and cutting tool wear of EPB TBM in soft ground

토사지반 EPB TBM의 굴진성능 및 커팅툴 마모량에 관한 실험장비 개발 및 기초연구

  • Received : 2018.02.09
  • Accepted : 2018.03.09
  • Published : 2018.03.31

Abstract

The excavation performance and the cutting tool wear prediction of shield TBM are very important issues for design and construction in TBM tunneling. For hard-rock TBMs, CSM and NTNU model have been widely used for prediction of disc cutter wear and penetration rate. But in case of soft-ground TBMs, the wear evaluation and the excavation performance have not been studied in details due to the complexity of the ground behavior and therefore few testing methods have been proposed. In this study, a new soil abrasion and penetration tester (SAPT) that simulates EPB TBM excavation process is introduced which overcomes the drawbacks of the previously developed soil abrasivity testers. Parametric tests for penetration rate, foam mixing ratio, foam concentration were conducted to evaluate influential parameters affecting TBM excavation and also ripper wear was measured in laboratory. The results of artificial soil specimen composed of 70% illite and 30% silica sand showed TBM additives such as foam play a key role in terms of excavation and tool wear.

Acknowledgement

Grant : 고수압 초장대 해저터널 자립을 위한 핵심요소 기술개발

Supported by : 건설교통과학기술진흥원

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