海底沉管隧道基础层压缩特性模型试验研究

doi:10.13722/j.cnki.jrme.2014.0018

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摘要以舟山沈家门港海底沉管隧道为原型，取纵向30 m建立1∶10缩尺寸模型，试验模拟了海水环境下注砂基础层的形成过程，采用水荷载来模拟均匀分布的施工荷载，研究碎石层、砂垫层、砂石混合基础层、存在回淤的砂石混合基础层的压缩过程和压缩模量Es，对比分析差异和原因。研究结果表明：施工期间基础层沉降随时间基本呈线性变化，单独碎石基础层、注砂法形成的密实砂盘、砂石复合基础层和大量回淤条件下砂石混合基础层的平均压缩模量Es分别为 0.67，0.80，3.26和1.85 MPa，各工况沉降量的大小与基础层密实度有很大关系；施工过程中砂石的相互作用能大大增加整体的压缩模量，约4.4倍于无相互作用影响的理论组合，而回淤则会削弱此影响，大大减小压缩模量。

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关键词 ：隧道工程, 沉管隧道, 模型试验, 基础层, 压缩特性, 施工荷载

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.

Key words： tunnelling engineering immersed tunnel model test base layer compression feature construction load

引用本文:

魏纲1，王栋迪1，邢建见2，裘慧杰2，杨泽飞1. 海底沉管隧道基础层压缩特性模型试验研究[J]. 岩石力学与工程学报, 2015, 34(s1): 2732-2739.
WEI Gang1，WANG Dongdi1，XING Jianjian2，QIU Huijie2，YANG Zefei1. MODEL TEST RESEARCH OF BASE LAYER COMPRESSION FEATURE IN SUBMARINE IMMERSED TUBE TUNNEL. , 2015, 34(s1): 2732-2739.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0018 或 http://www.rockmech.org/CN/Y2015/V34/Is1/2732

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