超大断面马蹄形盾构盾体系统研究设计及应用

发布时间：2018-02-09 08:29

本文关键词： 大断面马蹄形盾构载荷特性盾体结构仿真分析　出处：《隧道建设》2017年09期 　论文类型：期刊论文

【摘要】：为探索超大断面马蹄形盾构盾体载荷分布特性,解决超大马蹄形盾体设计关键技术问题,针对适用于单洞双线铁路隧道的超大马蹄形盾构护盾薄壳体轴向、周向载荷分布特性和传递规律展开研究,构建了盾体受载数学模型。基于上述载荷分析与功能需求详细探究了超大断面马蹄形盾构盾体的结构设计,明确了马蹄形盾体受力的薄弱环节,通过三维建模和有限元分析优化了盾体结构:壳体结构采用多半分体组合式结构,并通过法兰连接,满足了吊装和运输要求;壳体箱型环梁结构设计,在保证结构强度要求的同时节省了材料、减轻了质量;此外,进行了盾体的梭式结构、帽檐设计和超前注浆通道设计等针对性设计,有效提高了马蹄形盾构的适应能力。该马蹄形盾构的应用和盾体变形工业性监测试验表明,马蹄形盾构盾体结构满足整机平稳掘进、盾体微变形的要求,也印证了该数值模拟分析方法的正确性。
[Abstract]:In order to explore the load distribution characteristics of large section horseshoe shield, and to solve the key technical problems in the design of super large horseshoe shield, the axial direction of thin shield shell of large horseshoe shield applied to single tunnel and double track railway tunnel is studied. Based on the above load analysis and function requirement, the structure design of the large-section horseshoe shield shield is discussed in detail, which is based on the research of the distribution characteristics and transfer law of the circumferential load, and the mathematical model of the shield is constructed. The weak points of the force of horseshoe shield are defined, and the shield structure is optimized by 3D modeling and finite element analysis. The shell structure adopts the combined structure of most parts and flanges, which meets the requirements of hoisting and transportation. The shell box ring beam structure design can save material and reduce the quality while ensuring the structural strength requirement. In addition, the paper designs the shuttle structure of shield body, cap brim design and advanced grouting channel design, etc. The application of the horseshoe shield and the industrial monitoring test of the shield deformation show that the structure of the horseshoe shield meets the requirements of smooth driving and micro-deformation of the shield. The correctness of the numerical simulation analysis method is also verified.
【作者单位】：中铁工程装备集团有限公司;
【分类号】：U455.39

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