›› 2013, Vol. 34 ›› Issue (5): 1421-1428.

• Geotechnical Engineering • Previous Articles     Next Articles

Measurement and analysis of impact of foundation pit excavation on below existed shield tunnels

WEI Gang   

  1. Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, China
  • Received:2012-10-22 Online:2013-05-10 Published:2013-05-14

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2013

Abstract: The mechanism of foundation pit excavation affecting the below existing shield tunnel is researched. 14 cases of the foundation pit instance are collected to make a statistical analysis of measured data. The results show that the maximum vertical displacements of shield tunnel are all uplift, and 64% of the tunnel uplift values exceed the alarm value (10 mm). Based on the measured statistical data, an empirical tunnel maximum uplift value prediction formula below pit is proposed. Measured data of displacements in horizontal direction are fewer surveyed; and they are also small; the convergent small deformations change from “horizontal stretching, vertical compression” to the “horizontal compression, vertical stretching”. Based on the at Hangzhou Yan’an Road, underground street passage project, the influence of foundation pit excavation on lower shield tunnel deformation in Hangzhou Metro Line 1 is researched. The measured data of tunnel vertical displacements, horizontal displacements and horizontal convergence deformations are analyzed. The results verify the reliability of theoretical analysis and the proposed formula.

Key words: foundation pit, shield tunnel, excavation, uplift

CLC Number: 

  • TU 470
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