顶管施工对既有桥梁影响的三维数值分析

海绵城市管网顶管施工过程中时常临近既有桥梁,为分析研究顶管施工对既有桥梁的影响,在现场调查及分析勘察设计资料的基础上,分别基于理论分析及三维数值模拟,分析了顶管施工引起地表及既有桥梁附近土体的变形规律,并给出了具体的安全保护方案。研究结果表明,顶管施工对地面沉降的影响明显大于横向位移,非加固区设置应力及变形隔离墙后顶管施工对北新河桥桥台变形基本没有影响。研究结果和方法为类似的顶管工程施工提供了参考,具有实际工程意义。

Three dimensional numerical analysis of the influence of pipe jacking construction on existing bridges and safety protection scheme

The pipe jacking construction of sponge City pipe network is often close to the existing bridge. In order to analyze the influence of pipe jacking construction on the existing bridge, the deformation law of the soil mass near the surface and existing bridge was analyzed based on the theoretical analysis and three-dimensional numerical simulation. The analysis was based on field investigation and analysis of survey and design data. Finally, the specific security protection scheme was given. The results show that the influence of pipe jacking on land subsidence is greater than that of lateral displacement. The pipe jacking construction after setting stress and deformation isolation wall in non reinforced area has no effect on the abutment deformation of Beixinhe bridge. The research results and methods provide a reference for similar pipe jacking construction, and have practical engineering significance.