›› 2013, Vol. 34 ›› Issue (1): 290-298.

• Numerical Analysis • Previous Articles     Next Articles

Influence of long-term partial drainage of shield tunnel on tunnel deformation and surface settlement

LIU Yin1, 2，ZHANG Dong-mei1, 2，HUANG Hong-wei1, 2   

  1. 1. Key laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
  • Received:2012-06-25 Online:2013-01-10 Published:2013-01-10

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Abstract: It is reported that the long-term seepage of shield tunnel often results in significant settlements of ground surface and tunnel. A calculation method which meets the stiffness requirements of shield tunnel is firstly proposed to simulate the partial drainage of tunnel. The distribution of pore water pressure of soils around the tunnel, ground surface and tunnel settlement as well as tunnel deformation are investigated by considering different joint leakages in the context of the same magnitude of water inflow at steady state. The results indicate that the pore water pressure distribution, the settlement and tunnel deformation change significantly with variation of location of joint leaking. The pore water pressure around the tunnel decreases obviously when the leaking joint close to the tunnel invert, which results in larger ground surface and tunnel settlement. The tunnel will not only squat with time due to joint leaking, but occur horizontal displacement induced by unbalance loads. The distribution of pore water pressure, ground surface and tunnel settlement and tunnel deformation are all significantly different from those obtained by equivalent uniform drainage analysis. Finally, it is shown that the calculation without considering the partial drainage can not properly model the long-term behavior of the shield tunnel.

Key words: shield tunnel, joint leaking, pore water pressure, settlement, tunnel deformation

CLC Number: 

  • TU 471
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