柔性基础下柔性桩复合地基沉降计算研究

Study on settlement calculation of deformable piles composite ground under flexible foundation

研究表明,柔性桩复合地基存在有效桩长。首先,根据柔性基础下柔性桩复合地基桩侧摩阻力分布形式,假定桩土界面处桩土变形协调,基于剪切位移法推导出有效桩长的计算公式;其次,提出将复合地基压缩层分为三层来计算,利用弹性理论建立了加固区压缩量计算方法,同时采用Mindlin应力解建立了复合地基下卧层沉降的计算方法,在探讨相关计算参数取值的基础上建立了柔性基础下柔性桩复合地基沉降计算方法。最后,通过工程实例分析并与其它方法计算结果比较,表明本文方法的合理性与可行性。

Research shows that flexible pile composite foundation has effective length.Firstly,according to the distribution form of skin friction on pile,the formula for calculation effective length is derived by shear displacement method under the assumption that pile and soil satisfy deformation compatibility condition.Secondly,compressed layer of composite foundation is divided into three layers for calculation.Amount of compression in reinforced area is calculated based on elastic theory,and calculation method for substratum settlement of composite foundation is set up by using Mindlin’s stress solution.Then,settlement calculation method for flexible pile composite foundation under flexible foundation is developed by studying the determination of related parameters value.Finally,the method was used to analysis the practical engineering and compared with the traditional method,and the result showed that this method proposed here was feasible and reasonable.