中文摘要：

水平承载桩的合理桩间距是设计中的关键参数之一,理论上一般通过土拱效应对其进行求解,但多未考虑作用在土拱上的侧压力以及土拱变截面的影响.在土拱合理拱轴线为椭圆的假定下,结合考虑土拱侧壁上的土压力,基于静力平衡条件和摩尔-库伦强度准侧,建立了合理桩间距的计算方法.建议在实际工程应用时,土体抗剪强度参数应除以安全系数,折减后代入合理桩间距的计算.最后通过算例对此进行了验证.

英文摘要：

Reasonable pile spacing is one of the key parameters for design of horizontal bearing pile,and it is generally solved through soil arching theory.But these methods did not consider the role of lateral pressure on the arch and the variable cross-section of soil arching.Under the assumption that the reasonable arch axis in the soil was elliptical arch,taking into account the lateral earth pressure on soil arching,based on static equilibrium conditions and the Mohr-Coulomb strength theory,the authors proposed a calculating method of reasonable pile spacing.It is proposed that the soil shear strength parameters should be divided by the safety factor in the application of the method in the engineering application.Finally,the method was verified by an example.