【作者】 郑心铭；

【导师】 高波；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2005， 硕士

【摘要】 近年来,盾构法施工在地下工程中的应用日益广泛,因而,盾构隧道衬砌结构受力状况的研究也更显重要。管片设计研究的关键是设计方法的选择和设计参数的确定。随着人们对地层对衬砌结构受力约束作用的认识,形成了以地层和结构相互作用为特点的管片设计方法。目前国内外常用的方法主要有四种,即惯用法、修正惯用法、多铰环法和梁—弹簧模型法,而选择合理的设计方法能更准确地反映衬砌结构的受力状况。影响盾构隧道衬砌结构受力状况的因素较多,大致分为地层参数的影响和结构参数的影响两类,前者的不确定性因素较多,精确度较低,而后者则不确定因素相对较少,精确度较高。本文通过理论分析,选择了合理的设计方法,并分别对衬砌结构受力状况的主要影响因素进行了探讨,以期能找出有关规律指导工程实践。本文的主要研究特色是: (1) 分别对惯用法、修正惯用法、多铰环法和梁—弹簧模型法进行了理论分析,对比并选择了合理的设计方法。 (2) 对管片结构进行分析和合理的简化,即将管片设置为梁单元,将管片间接头简化为抗弯弹簧,而不考虑接头的拉伸和错动。运用ANSYS有限元软件对所选管片结构建立有限元模型。 (3) 通过计算探讨了一系列主要的地层参数和结构参数对管片设计的影响规律,并运用多项式拟合了各参数与管片最大轴力、最大正弯矩、最大负弯矩、最大竖向位移、最大横向位移间的函数关系。更多还原

【Abstract】 As the shield tunneling method is more and more widely used recent years, the study on the stress of the segments is being more important. The key of the segment design is selection of the design method and determination of the design parameters. Along with the cognition of the restriction of the formation to the segments increases, the segment design with the characteristic of the interacting of formation and structure forms. There are four major segment designs recently, thus Routine Method, Modified Routine Method, Multi-Hinge Ring Method and Beam-Spring Model Method. And the appropriate design can reflect the stress of the segments more accurately. The factors that reflect the stress of the segments include geological parameters and structure parameters. Compared with the latter, the former has more uncertainty but less accuracy. This paper chooses the appropriate design method through theoretical analysis, and discusses the major factors on the stress of segments. And the related rule will guide the engineering practice. This paper bears such features hereinafter.(1) Theoretical analyzing the Routine Method, Modified Routine Method, Multi-Hinge Ring Method and Beam-Spring Model Method respectively, and choose the appropriate design method after comparison.(2) Analyzing and simplifying the segment structure, thus entitling the segment to be beam element, and simplifying the joint to be bending springs. ANSYS is adopted for numerical simulation of the selected segment structure.(3) Discussing the influence rules to the segment design of the major geological parameters and structure parameters. And fitting the curve of function of the related parameters and the value of the Nmax, Mmax, -Mmax, ymax, xmax.更多还原