Study on Range of Pressure on Tunnel Face of Earth Pressure Balanced  Shield and Its Influence on Ground Surface Settlement

doi:10.3973/j.issn.1672-741X.2014.08.001

Tunnel Construction ›› 2014, Vol. 34 ›› Issue (8): 707-714.DOI: 10.3973/j.issn.1672-741X.2014.08.001

Study on Range of Pressure on Tunnel Face of Earth Pressure Balanced  Shield and Its Influence on Ground Surface Settlement

GONG Qiuming, MOU Shanqing, JIANG Houting, LU Dechun

（Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,  Beijing University of Technology, Beijing 100124, China）

Received:2014-03-04 Revised:2014-05-27 Online:2014-08-20 Published:2014-08-21

Abstract

Abstract:

EPB shield is widely used in the construction of Metro tunnels. Ground surface settlement induced by shield tunneling directly affects the safety of the tunnel construction. The authors use different theoretical methods to calculate the range of the pressure on the tunnel face in a shieldbored tunnel on Line 3 of Chengdu Metro. The shield boring process with different ground loss ratios and different pressures on the tunnel face is simulated by ABAQUS software embedded by constitutive model of soil stress path. The law of ground surface settlement induced by shield boring in gravel strata is obtained. The comparison and contrast between the ground surface settlement measured in the field and that obtained by means of theoretical calculations proves that the constitutive model adopted is rational. Proper range of the pressure on the tunnel face is determined. In addition, the relationship between the pressure on the tunnel face and the ground loss ratio is investigated and summarized so as to provide reference for similar projects in the future.

Key words: shieldbored tunnel, numerical simulation, pressure on tunnel face, ground loss ratio, ground surface settlement

CLC Number:

U 456.3

GONG Qiuming, MOU Shanqing, JIANG Houting, LU Dechun. Study on Range of Pressure on Tunnel Face of Earth Pressure Balanced  Shield and Its Influence on Ground Surface Settlement[J]. Tunnel Construction, 2014, 34(8): 707-714.

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Study on Range of Pressure on Tunnel Face of Earth Pressure Balanced  Shield and Its Influence on Ground Surface Settlement

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