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