低强度桩复合地基沉降计算方法研究

从低强度桩复合地基沉降变形模式出发,建立了一组低强度桩复合地基沉降计算的应力-应变协调方程。推导方程过程中,考虑了桩-土-垫层之间的相互作用,得出了桩土应力比和等沉面深度的解析解,并且进一步得到了桩和桩间土体的应力分布规律、压缩变形量、桩体上刺入垫层和下刺入下卧土层的刺入量。在此基础上,通过与复合地基下卧土层的压缩变形量求和,最终推导出了低强度桩复合地基的总沉降计算公式,为低强度桩复合地基的沉降计算提供了一种科学方法。

Study of calculating method of low strength piles composite foundation settlement

Based on the low strength piles composite foundation settlement model, a group of settlement calculating equations for the low strength piles composite foundation are put forward. During the equations derivation, the interaction between the pile-soil-cushion is considered, and the stress-strain compatible equations are constructed. At the same time, the pile-soil stress ratio and the analytical solution of equal settlement surface are also received. Further more, the piles and their surround soil stress distributing regulation, compression deformation, the up sticking deformation of the cushion and the lower sticking deformation of the underlying soil are all obtained. Through the summary of underlying soil and the piles surround soil compression deformations, a formula for calculating the whole settlement of the low strength piles composite foundation is received. The settlement calculating method presented above can be a significant reference for later research and design of the low strength piles composite foundation.