刚性桩复合地基褥垫层设计厚度计算探讨

本文针对刚性桩复合地基的褥垫层合理厚度设计进行了探讨。根据目前刚性桩复合地基应力场研究成果,对应力场进行简化,利用桩、土变形协调条件推导考虑负摩阻力时褥垫层厚度;对褥垫层进行受力分析,利用受力平衡条件推导不考虑负摩阻力时的褥垫层厚度。进行结果比较,提出对刚性桩复合地基褥垫层合理厚度设计的建议,供设计参考。

Further study on calculation of the designed thickness of cushions in composite foundation with rigid piles

Calculations of the designed thickness of cushions in composite foundation with rigid piles are further studied. According to the present achievements on the stress field of composite foundation with rigid piles, the stress field is simplified and the thickness of cushion with negative friction taken into account is deduced, based on the harmonious deformation conditions between piles and soil. Meanwhile, the stress analysis of cushions is carried out and the thickness is deduced again based on the equilibrium condition of stress, neglecting the negative friction. Then a comparison of the two calculations is made and the proposed thickness of cushions in composite foundation with rigid piles is put forward for a reference.