PHC管桩复合地基失稳分析及加固处治设计

Analysis of Instability of Composite Foundation of PHC Pipe Pile and Design of Reinforcement Treatment

湖南省某高速公路位于洞庭湖平原区,以湖相及河湖相沉积盆地的软土为主,失稳路段采用PHC管桩复合地基处治,当路基填筑到96区时,路基发生失稳滑移。以失稳滑移路段为依托,分析了管桩复合地基失稳的原因,发现了其失稳的破坏模式并非剪切破坏而是弯曲破坏,提出了加固处治设计。通过1.5 a的监测,其数据均已收敛,表明了其加固处治设计是安全可靠的,确保了高速公路如期通车和运营安全。

A highway in Hunan Province is located in the Dongting Lake plain area,mainly soft soil of lacustrine and lacustrine sedimentary basins,and the unstable road section adopts PHC pipe pile composite foundation treatment,and when the roadbed is filled to the 96th area,the roadbed understeps unstable and slipping.Relying on the unstable slip section,the reasons for the instability of the composite foundation of the pipe pile were analyzed,and it was found that the failure mode of the instability was not shear failure but bending failure,and a reinforcement treatment design was proposed.Through 1.5 a of monitoring,its data has converged,indicating that its reinforcement treatment design is safe and reliable,ensuring the safety of the highway opening and operation as scheduled.