Analysis And Application Of The CFG Pile Composite Foundation Cushion Effect

With the development of modern technology, the foundation treatment method is also more and more diverse. The CFG pile composite foundation as composite foundation representative is a kind of new soil foundation treatment technology, through the effective use of pile and soil interaction role of CFG, improve pile bearing capacity and deformation capacity, at the same time, through the rational setting of mattress layer so that the bearing capacity of soil around piles have been brought into full play. Due to the inherent characteristics of CFG pile composite foundation and relatively low cost, the CFG pile composite foundation has more and more applied in engineering construction.The cushion layer as CFG pile composite foundation is one of the important technologies, the CFG pile with double into the deformation capacity, ensure the soil between piles from first to last participation in the work, CFG pile composite foundation with cushion layer of many properties most are established, it has also become a distinct from the other pile foundation is the most typical feature set of mattress layer and how to set the cushion material and the cushion thickness, the CFG pile composite foundation pile soil and intensity of the play have a direct influence of cushion thickness, if set too small, pile for foundation will produce obvious stress concentration, which requires consideration of CFG pile on the basis of punching, LED to the foundation must be thicker, if CFG pile composite foundation pile breaking is the result of foundation under horizontal load caused by, and the thickness of cushion layer is set too small, can not be effectively pile carrying capacity of land, to achieve the design requirements of the bearing capacity of foundation, it is need to by increasing pile the length or number to achieve, economically cause unnecessary waste. If the cushion layer is arranged in the thickness is too large, will make the pile soil stress ratio is very close to or equal to1, the CFG pile bearing load is less, have actually lost in composite foundation set CFG pile, composite foundation bearing capacity relative to the natural foundation will have bigger rise, will be caused by foundation deformation is large, thickness of cushion setting is reasonable on CFG pile composite foundation bearing capacity improvement and settlement reduction is very favorable. CFG pile composite foundations with cushion layer elastic modulus, for CFG pile composite foundation performance impact is considerable, too large or too small are unreasonable.This article through to the CFG pile composite foundation cushion theory learning, using the finite element numerical simulation and single pile composite foundation static load test reasonably cushion thickness and modulus of elasticity. The bearing capacity of piles obtains the greatest advantage, so that the base stress concentration of the underside decreases relatively and the pile on the basis of the punching failure rate reductions. Reasonable share of pile and soil based on horizontal load, so as to realize the horizontal loads, will not cause the broken pile, the bearing capacity of composite foundation greatly.