双向增强体复合地基工后沉降分析

采用薄板变形理论和Winkler弹性地基模型计算双向增强体复合地基工后沉降量时,通常忽略了水平加筋垫层的水平抗力作用,本文引用双参数地基模型考虑该水平抗力对工后沉降的影响,推导了桩土加固区工后沉降的计算公式,对双向增强体复合地基工后沉降计算进行工程实例验算及参数分析,包括上覆路堤荷载水平、布桩形式、桩间距、垫层及桩间土的刚度等主要因素的影响。计算表明,加筋垫层的水平抗力对于降低工后沉降量是有利的,其影响不容忽视。加筋垫层的弹性模量及桩间土地基反力系数对工后沉降计算值影响较大,计算时应合理确定这些参数值。

Analysis of Residual Settlement of Two-direction Reinforced Composite Foundation

The horizontal resistant of the reinforced mattress was generally ignored based on the deformation theory of sheet plate and Winkler's elastic foundation model.A biparametric model was adopted to calculate the residual settlement of two-direction reinforced composite foundation considering the influences of the horizontal resistant on the residual settlement,and a formula for calculating the residual settlement was deduced.An example was given for examination and the parameters were analyzed,including the embankment load,pile arrangement,pile space,rigities of mattress and the surrounding soil,etc.The results indicate that(1) the horizontal resistant of reinforced mattress help to reduce the residual settlement,and the effect should be considered;(2) the elastic modules of the reinforced mattress and the coefficient of foundation reaction have effects on the calculation results of residual settlement significantly,and these parameters should be determined reasonable.