Research on Deformation Characteristics and Control Technology of Shield Continuous Crossing Existing Line
Based on the engineering background of the Niujie Station to Jinrongjie Station Section of the Beijing Metro Line 19,where the shield continuously over-crosses the national railway diameter line and under-crosses Changchunjie Station,the deformation law of the existing structure in the construction process of the shield continuous over-crossing and under-crossing is revealed by the combination of numerical simulation and measured data analysis.In the process of shield over-crossing and under-crossing,the deformation of the existing structure can be divided into three stages,among which the deformation caused by the cutterhead reaching the shield tail is the largest.During the over-crossing construction,the vertical deformation of the national railway diameter line is uplifted,and the overall deformation is symmetrically distributed along the intersection of the new and old tunnel axes.During the undercrossing construction,the vertical deformation of the existing station exhibits uneven settlement,which is mainly concentrated at the intersection of the newly built tunnel and the station.In addition,the effectiveness of"radial grouting+floor grouting"reinforcement measures to control the deformation of such complex crossing projects is verified by numerical simulation calculations and monitoring data analysis.
NETL
NSTL
万方数据
维普
