加筋和遮帘效应对群桩之间相互作用系数的影响

根据荷载传递法和Mindlin理论,提出了考虑桩加筋影响相互作用系数的简化计算方法,并且通过有限元软件ANSYS对桩的遮帘效应进行了深入分析;在此基础上,通过修正桩-桩之间地基的剪切模量来考虑桩的"遮帘"效应对相互系数的影响;将有限元计算结果和Cooke的现场试验实测结果进行了对比研究。结果表明,简化计算方法可以改善目前弹性理论分析方法中过高估计桩与桩相互作用而导致沉降计算值偏大的缺点。因此,该方法不但可以方便地计算相互作用系数,且计算结果接近实测值。

Study of Reinforcing Effect and Shadowing Effect on Pile-pile Interaction Factors

According to load transfer method and Mindlin theory,the simplified method that can consider reinforcing effect of piles was given.Moreover,shadowing effect of pile was analyzed by the software ANSYS.The soil shear modulus between two piles was modified to reflect the "shadowing effect" of piles.The results of the limit element analysis and Cooke's field test were compared.It shows that the simplified method can improve the limits of the elastic theory method that lead to higher pile-pile interaction factors so that the theory settlement of piles is often higher than the field results.The presented method can conveniently compute the interaction factors of piles which close to the measured data.