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在分析基桩的有效桩长计算现状及存在的问题基础上,假设桩侧摩阻力呈抛物线型分布,根据桩土顶面的位移协调条件,利用Mindlin位移解推导了有效桩长的计算公式,将其结果与桩侧摩阻力呈其它形式分布得到的有效桩长和实验数据进行比较,得出假设桩侧摩阻力呈抛物线分布时有效桩长解更接近实测数据更准确。为了将理论分析解应用到工程桩中,对影响参数进行分析,得到桩土弹模比和桩径对有效桩长的计算影响较大,泊松比的影响可以忽略不计,得到确定柔性桩有效桩长的取值范围表,参数取值方便,具有工程实用价值。
Based on the analysis of the present situation and existing problems of effective pile length calculation, assuming that the friction of pile side is parabolic, according to the displacement coordination condition of pile top and surface, the formula of effective pile length is deduced by Mindlin displacement solution. The results are compared with the effective pile length obtained from other forms of distribution of pile friction and experimental data. It is concluded that the effective pile length solution is closer to the measured data more accurately when the pile side friction is parabolic. In order to apply the theoretical analysis solution to engineering piles, the impact parameters are analyzed to get the effect of pile-soil elastic modulus ratio and pile diameter on the calculation of effective pile length. The influence of Poisson’s ratio can be neglected, Pile length range of tables, convenient parameter values, with engineering practical value.