盾构隧道管片结构优化设计研究

发布时间：2018-03-16 01:32

本文选题：盾构隧道　切入点：管片　出处：《武汉理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：伴随着我国经济的高速发展，隧道工程在全国得到大规模的开发，越来越多的大型隧道工程开工建设，由于其施工工艺的优势，盾构隧道掘进的同时进行出渣操作，衬砌在盾构机内拼装完成，随后实施壁后注浆操作，盾构隧道技术对周围土体的扰动小，对地层的沉降影响低，盾构法越来越受到设计者的青睐，越来越多的隧道工程采用盾构法施工。而管片，在盾构设计施工中至关重要，管片盾构隧道中起到支护和防护的作用，需要承担土压力、水压力以及各种特殊压力，其设计关乎到建筑成本和建筑安全。对管片的理论分析和优化设计具有实际意义。而本文结合南京纬三路过江隧道工程，通过理论分析和数值模拟，对管片的受力进行研究，并且结合神经网络和遗传算法，对管片的设计进行了优化分析。主要内容如下：（1）管片结构设计论述了管片结构设计的相关理论基础，阐明了盾构隧道管片间的接头单元理论，详细描述了管片设计所受到的相关荷载，并且介绍了管片设计中的计算方法，确定了研究管片的建模方式。通过对管片所在地形的分析和了解，，依据实际情况，计算了管片受到的相应荷载。（2）讨论管片优化相关因素基于有限元软件，对管片进行了理论分析，在相同荷载及相同管片几何条件下，探讨了惯用计算法和梁-弹簧模型的差别。同时通过控制变量法，对管片的单一属性，如管片长，管片宽，管片厚度等进行逐一分析，得到影响管片设计的相关因素。（3）建立结构优化设计方案通过正交试验，利用遗传算法并且结合神经网络对结构设计进行设计优化。选取盾构隧道管片的几个较为明显的影响因素，管片数量，管片宽度，管片厚度，管片接头刚度，管片接头刚度，将其作为控制变量，将管片隧道的相对位移值作为控制条件，进行设计优化。利用有限元软件对管片的内力进行模拟计算分析，得到相应状况下的管片受力分析。（4）论证将计算结果与原始设计对比，验证优化设计的正确性。讨论得到相关经验。
[Abstract]:With the rapid economic development of our country, the tunnel project has been developed on a large scale throughout the country, and more and more large-scale tunnel projects have been started. Because of the advantages of its construction technology, the shield tunneling is carried out at the same time. The lining is assembled in the shield machine, and then the backwall grouting operation is carried out. The shield tunnel technology has little disturbance to the surrounding soil and low influence on the ground settlement, so the shield method is more and more favored by the designers. More and more tunnel projects are constructed by shield method, and the segment is very important in shield design and construction. The shield tunnel plays a supporting and protective role in the segment shield tunnel, which needs to bear the earth pressure, water pressure and various special pressures. Its design is related to building cost and building safety. It has practical significance for theoretical analysis and optimization design of segments. In this paper, through theoretical analysis and numerical simulation, the stress of segments is studied in combination with the Nanjing Weijiang-crossing tunnel project. Combined with neural network and genetic algorithm, the design of segment is optimized and analyzed. The main contents are as follows:. Design of segment structure. This paper discusses the relevant theoretical basis of segment structure design, expounds the theory of joint element between segments of shield tunnel, describes in detail the relevant loads on segment design, and introduces the calculation method in segment design. Based on the analysis and understanding of the local shape of the segment, the corresponding load on the segment is calculated according to the actual situation. Discuss the relevant factors of segment optimization. Based on the finite element software, the theoretical analysis of the segment is carried out. Under the same load and the same segment geometry, the difference between the usual calculation method and the beam-spring model is discussed. At the same time, the single property of the segment is obtained by controlling the variable method. For example, the length, width and thickness of the segment are analyzed one by one, and the relevant factors affecting the design of the segment are obtained. To establish the optimal design scheme of the structure. Through orthogonal experiment, the structural design is optimized by genetic algorithm and neural network. The number of segments, the width of segment, the thickness of segment, the stiffness of segment joint are selected to influence the segment number of shield tunnel, the number of segments, the width of segment, the thickness of segment and the stiffness of segment joint. The stiffness of segment joint is taken as the control variable and the relative displacement of segment tunnel is taken as the control condition to optimize the design. The internal force of segment is simulated and analyzed by finite element software. The stress analysis of the segment in the corresponding condition is obtained. 4) argumentation. The results are compared with the original design to verify the correctness of the optimal design.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43

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