Calculation on Active Limit Support Pressure of Shield Tunnel Excavation Face in Dry Cohesionless Soil

doi:10.12068/j.issn.1005-3026.2018.09.026

Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (9): 1348-1352.DOI: 10.12068/j.issn.1005-3026.2018.09.026

• Resources & Civil Engineering • Previous Articles Next Articles

Calculation on Active Limit Support Pressure of Shield Tunnel Excavation Face in Dry Cohesionless Soil

CHENG Cheng¹， ZHAO Wen¹， CHENG Chao-nan¹， LI Fei²

1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2.Branch Corporation in Xi’an of China Railway 9th Bureau Group Corporation， Xi’an 710000， China.

Received:2017-02-24 Revised:2017-02-24 Online:2018-09-15 Published:2018-09-12
Contact: ZHAO Wen
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Abstract

Abstract: Reasonable calculation on the support pressure of tunnel face is important for tunnel stability. Based on the silo theory and the 3D wedge model， the sliding block ahead of the face was assumed as an arc wedge composed by part of a sphere and half a circular truncated cone; and the upper silo of the sliding block is assumed as half a cylinder. The active limit face support pressure on the excavation face in dry cohesionless soil was derived based on the equilibrium of the sliding block according to the equations of Terzaghi loose earth pressure and Rankine active earth pressure. The calculation results from the proposed equation are less than that from Wei Gang’s model and the 3D wedge model， but is close to the results by Chambon’s centrifuge model tests. The restrictions of this method was discussed through calculation error analysis.

Key words: shield tunnel, dry cohesionless soil, 3D wedge model, active limit face support pressure, calculation error

CLC Number:

TU473

CHENG Cheng， ZHAO Wen， CHENG Chao-nan， LI Fei. Calculation on Active Limit Support Pressure of Shield Tunnel Excavation Face in Dry Cohesionless Soil[J]. Journal of Northeastern University Natural Science, 2018, 39(9): 1348-1352.

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Calculation on Active Limit Support Pressure of Shield Tunnel Excavation Face in Dry Cohesionless Soil

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