Analysis on Reliability of Excavation Face Stability in Shallow Circular Tunnel

Wang Junfeng; Gao Guangyun; Zhang Lei

doi:10.3969/j.issn.1007-2993.2011.01.011

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Wang Junfeng, Gao Guangyun, Zhang Lei. Analysis on Reliability of Excavation Face Stability in Shallow Circular Tunnel[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2011, 25(1): 44-48. doi: 10.3969/j.issn.1007-2993.2011.01.011

Citation:

Wang Junfeng, Gao Guangyun, Zhang Lei. Analysis on Reliability of Excavation Face Stability in Shallow Circular Tunnel[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2011, 25(1): 44-48. doi: 10.3969/j.issn.1007-2993.2011.01.011

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Analysis on Reliability of Excavation Face Stability in Shallow Circular Tunnel

doi: 10.3969/j.issn.1007-2993.2011.01.011

Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji Univesity, Shanghai 200092, China

Received Date: 2010-09-25

Abstract

Abstract

Support pressure is a significant factor which influences on stability of excavation face in a shallow circular tunnel driven by a pressurized shield, which is also a key point in reliability analysis. FLAC3D simulation and response surface methodology is utilized for the reliability index β for ultimate state. Both soil shear strength parameters are considered as random variables as the ultimate state studying and also taking into account the statistical correlation between cohesion and internal friction angle. Finally, the assumption of uncorrelated variables was found conservative in comparison to the assumption of negatively correlated variables.
- shield tunnel,
- tunnel collapse pressure,
- FLAC^3D,
- stability