项目名称： 城市地铁穿越施工中无缝轨道与隧道结构相互作用规律研究

项目编号： No.51478032

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 杨成永

作者单位： 北京交通大学

项目金额： 87万元

中文摘要： 对城市地铁穿越工程，研究轨道与隧道的相互作用，建立因隧道底板变形引起的无砟无缝轨道变形和内力的计算方法。具体研究内容包括：总结归纳轨道与隧道相互作用的变形型式。考虑轴向拉力和伸长，推导钢轨变形的控制微分方程。探求控制微分方程的解法，进行不同方法求解精度的比较。进行支承块式和浮置板无砟道床刚度的理论和数值分析，确定整体道床的等效道床系数。对盾构隧道和矿山法隧道，进行轨道与隧道的不同相互作用变形型式的数值模拟。在北京选择典型地铁工点，实地测量钢轨、道床和隧道底板变形。根据数值模拟和现场测量结果，对理论模型进行修改完善。项目研究的意义在于全面掌握轨道与隧道的相互作用规律，提高城市地铁穿越施工中轨道变形计算方法的准确性和适用性。

中文关键词： 地铁隧道；无缝轨道；相互作用；穿越施工；理论模型

英文摘要： Interaction between track and tunnel lining affected by traversing excavation in urban subway is investigated, and a methodology is proposed to compute the deformation and internal forces of the seamless track caused by the deformation of bottom plate of the tunnel. The interaction between track and tunnel lining is summarized and classified into basic patterns of deformation. Taking into account axial tensile force and axial extension of the continuously welded track, control differential equations to describe the deformation of the track are derived out. Both analytical and numerical solutions for the differential equation are approached and compared. Analitical and numerical investigation on the rigidity of the ballastless track beds, both block sleeper track bed and floating slab track bed, are conducted. Equivalent track bed coefficients for the two monolithic track beds are determined. Finite element method is employed to simulate the deformation behavior of the track for different patterns of deformation. Typical subway tunnels will be selected in Beijing to do case studies, where the settlement of the track, track bed and tunnel lining will be measured. Knowledge coming out of numerical simulation and in-situ instrumentation will contribute in promoting the analytical model. This research will improve our understanding to the regulation of interaction between the track and the tunnel, and will also enhance the accuracy and applicability of the calculation method for the deformation of the track in urban subway.

英文关键词： subway tunnel;seamless track;interaction;traversing excavation;analytical model