盾构隧道衬砌环轴线偏差计算方法研究

软土地区快速轨道交通盾构隧道具有线路控制更加严格,施工质量及线路精度控制难度更大等特点。为快速准确地计算盾构隧道衬砌环的轴线偏差,首先,基于一般形式的地铁线路线形,以隧道里程为纽带,对隧道设计轴线的三维坐标进行了解算;其次,采用二分法,通过不断迭代给出衬砌环偏差计算点对应隧道设计轴线的理论位置,进而提出衬砌环平面和高程偏差的计算方法;最后,结合天津市滨海新区轨道交通Z2线线路资料,给出衬砌环偏差计算的过程及结果。

Study on calculation method of the deviation of lining ring axis for shield tunnel

Shield tunnels used for rail rapid transit in soft soil areas are characterized by stricter line control, worse construction quality and more difficult in line precision control. In order to calculate the deviation of lining ring axis for shield tunnel quickly and accurately, firstly, based on the general form of metro line alignment and taking tunnel mileage as a link, the calculation method of three-dimensional coordinates of tunnel design axis (DTA) is given. Secondly, by means of dichotomy and continuous iteration, the theoretical position of deviation calculation point of lining ring corresponding to DTA is computed, and then the calculation method of plane deviation and elevation deviation of lining ring is proposed. Finally, combined with the line data of the Z2 line project of Tianjin Binhai New District, the calculation process and results of the deviation of lining ring are presented.