| 沉管隧道含垄沟卵石垫层变形特性试验研究 |
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| 引用本文： | 李志成,冯先导,沈立龙.沉管隧道含垄沟卵石垫层变形特性试验研究[J].岩土力学,2019,40(Z1):189-194. |
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| 作者姓名： | 李志成 冯先导 沈立龙 |
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| 作者单位： | 1. 中交二航局 第五工程分公司，湖北 武汉 430040；2. 中交第二航务工程局有限公司技术中心，湖北 武汉 430040；
3. 交通基础设施智能制造技术交通运输行业研发中心，湖北 武汉 430040 |
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| 摘 要： | 采用含垄沟卵石垫层作为大型沉管隧道的基础是一种创新，为研究水下该垫层在工程荷载下的变形特性，开展了7种不同工况模型静载试验，得到各工况下卵石垫层沉降量、压缩模量等参数以及荷载值与沉降量之间的关系，分析了垫层厚度、垄沟尺寸、预压荷载、级配大小等指标对卵石垫层力学特性的影响。试验结果表明，不同于碎石垫层卵石垫层承受的竖向荷载与其沉降量开始成非线性变化；随着荷载值的增加，垫层沉降速率逐渐减小，垫层被压密一定程度后荷载与沉降趋于线性关系；卵石的最大粒径越大，垫层的压缩模量越大，沉降量越小；预压导致卵石垫层再压缩时沉降明显减小，且压缩模量增大；垄沟的间距越大，卵石垫层的压缩模量越小，沉降量越大。垫层厚度越大，卵石垫层的压缩模量与沉降越大。研究成果可为沉管隧道垫层的设计提供参考。
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| 关 键 词： | 沉管隧道 卵石垫层 变形特性 试验研究 |
| 收稿时间： | 2018-11-03 |
Experimental study of deformation characteristics of pebble cushion with furrow for immersed tunnel |
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| LI Zhi-cheng,FENG Xian-dao,SHENG Li-long.Experimental study of deformation characteristics of pebble cushion with furrow for immersed tunnel[J].Rock and Soil Mechanics,2019,40(Z1):189-194. |
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| Authors: | LI Zhi-cheng FENG Xian-dao SHENG Li-long |
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| Institution: | 1. The Fifth Construction Company, CCCC Second Harbor Engineering Co., Ltd., Wuhan, Hubei 430040, China;
2. CCCC Second Harbor Engineering Co., Ltd., Wuhan, Hubei 430040, China;
3. Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure, Wuhan, Hubei 430040, China |
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| Abstract: | It is an innovation to use pebble cushion with furrow as the foundation of a large-scale immersed tunnel. In order to investigate the deformation characteristics of the pebble cushion subjected to engineering load under water, static load model tests are carried out in seven working conditions. The compression modulus of pebble cushion under various working conditions, the relationship between load and settlement are obtained. The effects of cushion thickness, ridge and furrow dimensions, preloading load and gradation on the mechanical properties of pebble cushion are analyzed. Unlike the gravel cushion, the settlement of pebble cushion initially changes nonlinearly with vertical load. With the increase of load, the settlement rate of the pebble cushion gradually decreases. The relationship between load and settlement tends to be linear after the cushion is compacted to a certain extent. The larger maximum size of the pebble results in a larger compression modulus of the cushion and a smaller settlement. The pre-compression leads to a significant reduction in the subsidence of the pebble cushion and an increase in compression modulus when compressed again. As the distance between the furrows increases and the compression modulus of pebble cushion decreases, the settlement increases. With increasing the thickness of the cushion, the settlement and compression modulus of the pebble cushion increase slightly. The research results can provide reference for the design of immersed tunnel cushion. |
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| Keywords: | immersed tunnel pebble cushion deformation characteristics experimental study |
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