Proceedings of the Korean Society for Rock Mechanics Conference (한국암반공학회:학술대회논문집)
- 2001.10a
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- Pages.115-120
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- 2001
Net Penetration Rate of a Large Diameter Shield TBM in Hard Rock
대구경 Shield TBM의 암반층 굴착속도
Abstract
In No. 1 tunnel for Kwnagju urban subway construction, net penetration rate of the shield TBM was analyzed. This tunnel of 540 m length is located in soil layers at starting and in hard rocks such as amphibolite and granitic gneiss at ending with 84 m length. The net penetration rate was dropped down to 2∼11 cm/hr in rock while 50∼80 cm/hr in soil. Theoretical penetration rate is analyzed in conditions of machine and rock in order to compare the actual net penetration rate. The relationships between net penetration rate and thrust force is also investigated in this report.