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| Analysis of the Long - term Settlement of Immersed Tunnel with Considering K0 Consolidation of Undisturbed Soft Clay |
| KOU Lei1，BAI Yun2 |
| (1. Zhengzhou University，Zhengzhou，Henan 450002，China; 2. Tongji University，Shanghai 200092，China) |
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Abstract Research purposes : The varying degrees of differential settlement appears during the operation of immersed tunnel in soft soil area，the cracking and leakage of segments caused by the excessive settlement severely impacts the operational safety of immersed tunnels. The immersed tunnel settlement in essence results from changes of mechanical properties of saturated undisturbed underwater soil caused by the disturbance of tunnel construction and the soil deformation with significant time - space characteristics under external loads. So a study is necessary to accurately calculate the values and distributions of settlement with time - space characteristics. Research conclusions :( 1) The results show that the settlement rate of outer ring immersed tunnel has maintained about 0. 001 5 mm/d，the settlement converges to steady state. (2) The thickness of salutation on top of the immersed tunnel is deeper，the development of settlement is greater，the dredging should be timely. (3 ) The settlement during the operation increases caused by the dissipation of pore water pressure in foundation layer. The reasonable treatment method of foundation layer is beneficial to reduce the settlement. (4) The research result can provide theoretical basis for the foundation problems of soft clay with time - space characteristics，and reference for optimization tunnel design and assurance operation safety of the immersed tunnel.
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Received: 08 September 2015
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2016, Vol. 33 
