某特大桥桥墩沉降原因分析和处治对策

运营阶段桥梁发生下沉病害的原因有很多,除因地层滑动原因外大多与地基承载力关系密切。通过对桥下回填厚层杂填土引起桥墩下沉的变形规律分析以及对回填土沉降产生的附加荷载的计算,认为造成某特大桥桥墩下沉的主要原因是基础承受了太大的附加荷载。通过沉降分析,认为当前变形已经趋于稳定。但为了大桥运营安全,建议继续进行沉降监测,并且做好相应之处的排水通道。

Analysis of Settlement Reasons and Treatment Measures of the Piers of a Grand Bridge

There are many reasons for the subsidence of bridges in the operation stage, except for the stratum slip, most of them are closely related to the bearing capacity of foundation. Based on the analysis of deformation law of pier subsidence caused by backfill thick layer of miscellaneous soil under the bridge and the calculation of additional load caused by backfill settlement, it is concluded that the main cause of the pier subsidence of the long-span bridge is that the foundation bears too much additional load. Through settlement analysis, it is concluded that the current deformation has become stable. However, to ensure the safety of the bridge operation, it is recommended to continue settlement monitoring and make appropriate drainage channels.