The Rigid-Flexible Working Properties Of Composite Foundation In Passenger Dedicated Line From Harbin To Dalian

With the continuous development of ground processing, rigid-flexible piles is one of a new forms of ground treatment approach. Rigid-flexible piles to reduce settlement and meet the strength advantages, but also has lower construction costs, help ensure the quality advantages.Rigid-flexible piles as the foundation of a new approach; with its good results and economic benefits has been widely used. But today, people on the rigid flexible working mechanism of composite foundation are still in the preliminary stages of understanding. New Yingkou station CFG+MIP composite foundation of the specific examples of projects, Through theoretical analysis, field test and numerical analysis approach of the rigid-flexible working mechanism to further improve the rigid-flexible theory of composite foundation system. This article reads as follows:1. Describes the development of composite foundation and basic theory, rigid flexible production and development of composite foundation, introduced in the design and construction of some important parameters in the calculation method and some frequently used in the current design of the design theory.2. Introduces the field test work and testing components of the burial situation, the field test measured a large number of raw data and analyzed, the obtained CFG pile composite foundation with a single component, MIP pile by the soil between piles, etc. Force and deformation. And the bearing capacity of composite foundation, made a summary of deformation. Validate and enrich the current rigid-flexible piles theory.3. PLAXIS means of finite element software for numerical simulation, and compared with the measured results. Analysis shows that:good agreement between the results verify the numerical simulation is reasonable. By changing parameters such as the CFG pile length, MIP pile length, pile spacing and thickness of cushion on the composite foundation bearing, deformation were analyzed and the range of reasonable parameters, as the basis for the design of future.