不均匀软土地质中槽壁加固关键技术研究

Key Technology of Groove Wall Reinforcement in Uneven Soft Soil

南京仙新路过江通道采用主跨1760m的单跨门形塔整体钢箱梁悬索桥,南锚碇采用地下连续墙基础,深度达60m。南锚碇处超厚、不均匀软土地质使槽壁加固深度达到48m,在槽壁加固实施前,通过补勘方式进一步对设计地质勘察资料进行完善。在方案确定阶段对不同槽壁加固工艺进行比选、论证,最终确定采用CSM工法作为槽壁加固工艺。CSM工法具有稳定、科技化的工艺控制优点。采用顺槽施作工艺完成的槽壁加固,从地下连续墙及基坑开挖情况看,CSM工法墙墙体质量均匀、强度可靠。

Nanjing Xianxin Road river crossing adopts 1760m main span single-span gate tower integral steel box girder suspension bridge,and the south anchorage adopts the diaphragm wall foundation with a depth of 60m.The super thick and uneven soft soil of the south anchorage makes the depth of the groove wall reinforcement reach 48m.Before the reinforcement of the groove wall is implemented,the design geological survey data is further improved by means of supplementary survey.At the stage of scheme determination,different reinforcement technologies are compared and demonstrated,and finally CSM method is adopted as the reinforcement technology of the groove wall.CSM method has stable and scientific process control advantages.According to the condition of diaphragm wall and foundation excavation by groove wall reinforcement completed by groove construction process,the wall quality by CSM method is uniform and the strength is reliable.