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| Damage Analysis and Repair Technology of OMEGA Gasket in Immersed Tube Tunnel |
| BAI Yun, LU Hong – hao |
| (Tongji University, Shanghai 200092, China) |
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Abstract Abstract ： Research purposes ： As the weak link of immersed tube tunnel， the joint is easily becoming damaged or aged. Especially for those who is built in soft soil foundation，the differential settlement often causes joint damage which can seriously affect the working life of immersed tube tunnel. To meet the operational requirements of a century， the joint needs to be repaired during working life. Thus， it is necessary to bring out a repair plan which is reliable， convenient and with good applicability. Meanwhile, in the view of precaution, the prevention programs corresponding to damage reasons are also requisite. Research conclusions:(1) Based on the monitored data and field observations，the damage on the OMEGA gaskets of Shanghai outer line tunnel is summarized to a three - stage process. (2) The corresponding solutions are put forward which include settlement control， relative displacement limits and OMEGA gasket repair. The replacement scheme for the OMEGA gasket can minimize the interference on traffic. (3) Corresponding to the causes of damage in each stage， prevention suggestions are given， including adding a GINA stop， planning of the utilization of shoreside ground and grouting according to settlement data. (4) Repair plans and prevention suggestions mentioned in this paper can be promoted as a reference for repair projects of further rail and road immersed tube tunnels.
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Received: 03 June 2016
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2016, Vol. 33 
