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为从理论上探讨群桩中桩-土-桩的相互作用,分析该作用对群桩端阻力形成机理的影响,以建立在压缩机理之上的适用于单桩端阻力分析的Ohde理论为基础,提出了无黏性土中群桩极限端阻力的计算模式,据此分别推导出了群桩中边桩和中桩的极限端阻力理论计算公式.该公式能够定量反映桩距、桩径、桩端的入土深度和桩端以下土层的物理力学性质等因素对极限端阻力的影响,计算得到的群桩极限端阻力随相对桩距(桩距与桩径之比)减小而增加的规律与模型试验的实测结果基本一致.
In order to theoretically investigate the pile-soil-pile interaction in pile group, the effect of this action on the formation resistance of pile tip is analyzed. Based on the Ohde theory which is based on the compressive mechanism and applied to the analysis of pile tip resistance , The calculation model of ultimate end resistance of group pile in non-cohesive soil is put forward, and the theoretical formula of ultimate resistance of middle pile and middle pile in pile group is derived respectively.The formula can quantitatively reflect the pile distance, pile diameter, Pile end into the soil depth and the pile tip below the physical and mechanical properties of the soil and other factors on the end of the resistance of the end of the group resistance limit pile resistance with the relative distance between the pile (pile to pile diameter ratio) to increase the law The results of the model test are basically the same.