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| MODEL TEST RESEARCH OF BASE LAYER COMPRESSION FEATURE IN SUBMARINE IMMERSED TUBE TUNNEL |
| WEI Gang1，WANG Dongdi1，XING Jianjian2，QIU Huijie2，YANG Zefei1 |
(1. Department of Civil Engineering，Zhejiang University City College，Hangzhou，Zhejiang 310015，China；
2. Institute of Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China) |
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Abstract Based on the prototype of Zhoushan Shenjiamen Port immersed tube tunnel，a 1∶10 scale shrinkage model test is established in longitudinal of 30 m. The test simulates the uniform distribution construction load through the water load and focuses on the formation process of sand base layer in marine environment to study the compression process and compression modulus Es of four kinds of base layer which is composed by gravel，sand，sand and gravel mixed，sand and gravel mixed with lots of silting，and the difference is compared and analyzed. The results show that，base layer construction settlement is integrally in the linear elastic stage，and the compression modulus Es of four kinds of base layer are respectively 0.67，0.80，3.26，1.85 MPa in average which have a lot to do with the base layer density. Interaction of sand and gravel during the base layer construction will greatly increase the compression modulus，which is about 4.4 times of the mixed condition without interaction in theory. The back-silting can weaken this influence and will greatly decrease the compression modulus.
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2015, Vol. 34 
