类矩形盾构隧道管片及立柱拼装误差仿真研究

Simulation Study on Assembly Errors of Segments and Columns in Quasi-Rectangular Shield Tunnels

文章以宁波轨交3号线类矩形盾构隧道项目为背景,研究了盾构隧道衬砌拼装缺陷的形成机理和控制措施;通过建立类矩形盾构隧道管片几何模型,并考虑管片三维六自由度位移,提出了管片拼装误差仿真计算方法;并对制作误差和拼装定位误差进行了量化,编制了拼装仿真程序,对衬砌管片拼装进行了模拟。根据拼装仿真结果,结合施工要求和规范要求,得出了误差累积最小的拼装顺序及误差控制措施,预测了隧道管片和立柱的拼装质量,可为实际施工的质量控制提供依据。

Based on a quasi-rectangular shield tunnel in Ningbo rail transit line 3,the formation mechanism of segment erection defects in shield tunnel lining and corresponding control measures have been studied in this paper.A simulation method of segment erection defects is proposed according to a geometric model of segment in a quasirectangular shield tunnel,and the fabrication errors and assembly location errors are quantified to establish a assemble simulation program which can simulate segment erection considering the three-dimensional 6-DOF displacement of the segment.On the basis of simulation results,construction and standard requirements,a erection sequence with less error accumulation and error control measures are given,meanwhile the assembly quality of tunnel segment and column is predicted,which provides a basis for the quality control of practical construciton.