基于剪切位移法的长短桩复合地基沉降计算

在深入探讨长短桩复合地基作用机理基础上,针对长短桩复合地基的桩–土–承台整体相互作用特点,通过一定的简化假定,建立出长短桩复合地基的沉降计算模型;然后以剪切位移法为基础,引入Mylonakis&Gazetas桩-桩、桩-土相互作用模型,导出长短桩复合地基计算时的桩-桩、桩-土以及土-土相互作用柔度系数;在此基础上,考虑垫层作用的影响,提出一种综合考虑桩-土-垫层体系共同作用的长短桩复合地基沉降计算方法,并编制出相应的计算程序。最后利用该法对某工程实例进行了计算分析,结果表明,基于本文方法获得的沉降预测值与实测值吻合较好。

Settlement calculation of the long-short-pile composite foundation with shear displacement method

Considering the characteristics of integral mutual action between pile,soil and cap,the model of long-short-pile composite foundation was established,and the mechanics of such composite foundation were fully discussed.Based on the shear displacement method,the Mylonakis &; Gazetas models for mutual action between two piles and between pile and soil were introduced,and then the flexible factors of mutual actions were provided.Considering the performance of cushion,a method to analyze the settlement of long-short-pile composite foundation was deduced,which could consider the mutual actions between pile,soil and cap,and the correlated program was also developed.Finally,when the method was used to analyze the practical project,its feasibility was proved by the reasonable agreement between the calculated and the measured values.