Variable Stiffness Composite Pile System Matching Stress Gradient

Abstract

The invention discloses a stress gradient matched variable rigidity stiffened composite pile system. The stress gradient matched variable rigidity stiffened composite pile system comprises a certain number of stiffened composite piles and a certain number of short vertical reinforcement bodies, wherein the stiffened composite piles comprise peripheral piles and core piles; the peripheral piles areformed by discrete piles or cement soil piles or the combination of discrete bodies and cement soil; the core piles are formed by precast piles or cast-in-place concrete piles or the combination of the precast piles and the cast-in-place concrete; the peripheral piles and the short vertical reinforcement bodies of the stiffened composite piles are constructed by a large diameter and high power dry and wet stirring piling machine by adopting a high pressure spiral stirring and spiral reverse compression process; and when the peripheral piles and the short vertical reinforcement bodies are formed by the combination of the concrete soil or discrete cement soil, part of the peripheral piles and the short vertical reinforcement bodies are constructed by adopting a dry method, the rest part areconstructed by adopting a wet method, and the piles which are constructed by adopting the dry method and that constructed by adopting the wet method are arranged at intervals. According to the stressgradient matched variable rigidity stiffened composite pile system, the rigidity and strength of the system from top to bottom are matched with the actual additional stress gradient, so that the bearing capacity of the piles selves is fully exerted, the settlement is controlled, and the cost is saved.

Description

technical field [0001] The invention relates to a rigid composite pile system. Background technique [0002] The existing engineering foundation design generally adopts simple pile foundation or simple composite foundation, and the same pile type, same material, same section and length, and same construction method are generally used in the design of the same engineering foundation. [0003] In fact, there is a gradient change in the additional stress from shallow to deep: the additional stress in the shallow place is large, the additional stress in the deep place is small, and the pile type with a larger proportion of friction resistance to the total bearing capacity has a faster attenuation of the additional stress from top to bottom, that is, the stress The larger the gradient. For stiff composite piles, a typical friction pile, the additional stress gradient is very large, and the stress is mainly concentrated on the upper part of the pile body. If the rigid composite ...

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