减沉桩在沉管隧道中应用的室内模型试验

发布时间：2018-10-20 15:19

【摘要】：为了优化减沉桩在港珠澳大桥沉管隧道中的应用,根据相似理论,采用正交试验设计方案,设置了桩距、桩长、垫层厚度、有无桩帽4个影响因素和3个水平,完成了19组室内模型试验。借助于SPSS统计分析软件,采用方差分析对试验结果进行定性和定量分析。结果表明:桩长对沉降影响最为显著,对减沉效果的影响程度由大到小依次为桩长、桩距、垫层厚度、桩帽;各影响因素间的交互作用较小,皮尔逊相关系数显示在荷载较小时,桩距与沉降相关度较大,随着荷载的增大,桩长与沉降的相关度增强;减沉桩设计中桩长、桩距、垫层厚度均存在着合理的范围,桩帽可以取消。所得结论为港珠澳大桥沉管隧道的优化设计提供了理论依据,节省了工期和造价。
[Abstract]:In order to optimize the application of reducing piling in the sinking tunnel of HongKong-Zhuhai-Macao Bridge, according to the similarity theory, according to the orthogonal experimental design scheme, the pile spacing, pile length, cushion thickness, whether there is a pile cap or not, four influencing factors and three levels are set up. 19 groups of indoor model tests were completed. With the help of SPSS statistical analysis software, the qualitative and quantitative analysis of test results was carried out by means of ANOVA. The results show that the influence of pile length on settlement is the most significant, and the degree of influence on the settlement effect is in the order of pile length, pile spacing, cushion thickness, pile cap, and the interaction between various factors is relatively small. Pearson correlation coefficient shows that when the load is small, the correlation between pile spacing and settlement is greater, and with the increase of load, the correlation between pile length and settlement is enhanced, and there is a reasonable range of pile length, pile spacing and cushion thickness in reducing pile sinking design. The pile cap can be removed. The conclusion provides a theoretical basis for the optimum design of the immersed tunnel of HongKong-Zhuhai-Macao Bridge and saves the time limit and cost.
【作者单位】：东南大学土木工程学院;无锡市民用建筑设计院有限公司;
【基金】：国家重点基础研究发展计划(“九七三”计划)项目(2013CB036304) “十二五”国家科技支撑计划项目(2011BAG07B01)
【分类号】：U455.4;U459.5

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