一种改进的盾构隧道双层衬砌分析模型及其应用研究

发布时间：2018-03-03 10:27

本文选题：隧道工程　切入点：盾构隧道　出处：《岩石力学与工程学报》2014年01期 　论文类型：期刊论文

【摘要】：在分析现有3种双层衬砌数值模型的基础上,提出改进的双层衬砌盾构隧道衬砌梁接头弹簧结合面压杆弹簧组合分析模型。该模型采用压杆、结合面点位移耦合等技术,解决现有模型中地层与衬砌之间、双层衬砌结合面之间存在拉力以及结合面剪切应力与剪切位移无关等问题,提出适用于该模型的双层衬砌结合面和地层衬砌接触面参数计算依据,探讨结合面单元数量对分析结果的影响,研究杭长客运专线钱塘江隧道双层衬砌的力学行为。研究结果表明:(1)双层衬砌厚度增大将引起双层衬砌弯矩明显增大,其增大趋势与双层衬砌厚度增大趋势基本一致;(2)双层衬砌厚度的增大对轴力的影响甚微;(3)双层衬砌弯矩在管片衬砌和二次衬砌之间的分配比例与管片衬砌和二次衬砌的厚度相对比例无线性关系。研究结果对未来水下双层衬砌盾构隧道的设计分析具有一定的参考价值。
[Abstract]:Based on the analysis of three kinds of existing double-layer lining numerical models, an improved combined analysis model of spring and joint spring of double-layer lining shield tunnel lining beam joint is put forward. Combined with the technique of point displacement coupling, the problems such as tension between stratum and lining in existing models, and shear stress between double lining and shear displacement are solved, and the shear stress of joint plane is independent of shear displacement, and so on. This paper puts forward the calculation basis of the parameters of the double-layer lining joint surface and the stratum lining contact surface suitable for the model, and discusses the influence of the number of the joint face elements on the analysis results. The mechanical behavior of two-layer lining of Qiantang River Tunnel in Hangzhou-long passenger dedicated Line is studied. The results show that the increase of double-layer lining thickness will result in a significant increase in the bending moment of double-layer lining. Its increasing trend is basically consistent with the increasing trend of double-layer lining thickness.) the increase of double-layer lining thickness has little effect on axial force.) the distribution ratio of double layer lining bending moment between segment lining and secondary lining and segment lining and secondary lining have little effect on axial force. The results of the study are valuable for the design and analysis of underwater double-lining shield tunnel in the future.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;
【基金】：教育部新世纪人才资助项目(NCET 11 0713) 国家自然科学基金资助项目(51178400) 高速铁路联合基金重点项目(U1134208)
【分类号】：U451.4

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