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软土地区新老高速公路拼宽路段的差异沉降控制是最近几年高速公路建设一个重要的研究课题,结合嘉绍高速公路3个新老路交通枢纽的拼宽路段沉降动态监测数据,同时参考实际工程中出现的路基路面开裂问题,从沉降量与沉降速率两方面进行对比分析,得到复合地基处理拼宽段软基可以很好的控制差异沉降。通过分析提出适用于嘉兴地区拼宽工程的“三重”沉降控制标准:施工期沉降速率控制标准、新老路堤差异沉降控制标准以及横坡比变化控制标准。通过该标准的控制可以有效减小高速公路软基拼宽段差异沉降,结论对类似工程地质条件的工程提供一定的参考价值。
The difference settlement control of new and old expressway in soft soil area is an important research topic in highway construction in recent years. Combined with the dynamic monitoring data of the settlement of 3 sections of Jiashao Expressway traffic junction, In the actual project, the problem of cracking of roadbed and pavement is analyzed, and the settlement and settlement rate are compared and analyzed. It is found that the treatment of the soft foundation in the composite foundation can well control the differential settlement. Through the analysis, the control criteria of “triple” settlement suitable for quarrying works in Jiaxing area are put forward: control standard of settlement rate in construction period, control standard of differential settlement of old and new embankments and control standard of variation of cross slope ratio. The standard control can effectively reduce the soft subsoil widening section differential settlement, the conclusion of similar engineering geological conditions of the project to provide some reference value.