海底沉管隧道基础层压缩特性模型试验研究

发布时间：2018-02-11 05:05

本文关键词： 隧道工程沉管隧道模型试验基础层压缩特性施工荷载　出处：《岩石力学与工程学报》2015年S1期 　论文类型：期刊论文

【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。
[Abstract]:In this paper, the 1:10 shrinkage model is established by taking the submerged tunnel of Shenjiagang port in Zhoushan as the prototype. The formation process of sand injection foundation layer under seawater environment is simulated by experiments. The uniform distribution of construction load is simulated by water load, and the gravel layer is studied. The compression process and compression modulus (Ess) of sand and stone mixed foundation layer with siltation are compared and analyzed. The results show that the settlement of foundation layer changes linearly with time during construction. A compact sand plate formed by the sand injection method in separate gravel foundation beds, The average compression modulus (es) of sand and gravel mixed foundation layer is 0.670.80 / 3.26 and 1.85 MPa respectively under the conditions of sand and gravel composite foundation and a great deal of siltation. The settlement of each condition is related to the density of the foundation layer. The interaction of sand and stone during construction can greatly increase the compression modulus of the whole, which is about 4.4 times that of the theoretical combination without interaction, but the siltation will weaken this effect and greatly reduce the compression modulus.
【作者单位】：浙江大学城市学院土木工程系;浙江大学岩土工程研究所;
【基金】：国家自然科学基金资助项目(51178428) 浙江省自然科学基金资助项目(LZ12E08001) 浙江省本科院校中青年学科带头人学术攀登项目(pd2013454)
【分类号】：U459.5

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