中文摘要：

基于桩间土的斜拱效应，考虑边坡的倾角对抗滑桩桩间距的影响，并以此建立计算模型。首先在假定土拱的轴线为抛物线的基础上，根据水平面、竖直面内的静力平衡条件和强度条件，推导出桩间距的计算公式，分别得到了相应的合理桩间距计算方法。其次通过具体工程实例，阐述考虑边坡倾角情况下抗滑桩桩间距的计算过程，得到了比较合理的计算结果，并分析了桩间距与土体内摩擦角以及桩间距与坡面倾角之间的关系。分析结果表明，在其他因素不变的情况下，桩间距随桩后土体的内摩擦角增大而增大，随边坡倾角增大先增大后减小。

英文摘要：

Considering the influence of the slope angle on the anti-slide piles spacing, a calculation model is established based on inclined soil-arch effect between piles. Firstly, on the basis of the assumption that arch axis is parabolic, according to the static equilibrium condition and strength condition inside horizontal plane and vertical plane, a calculation formula of piles spacing is derived; and corresponding rational calculation formulas for piles spacing are obtained respectively. Secondly, the calculated process of piles spacing is illustrated through the calculation of concrete engineering examples; and the result is rational; then the relationship between piles spacing and internal friction angle of soil, as well as the relationship between piles spacing and the angle of the slope are analyzed. The results show that the spacing is increasing with increase of internal friction angle of soil behind piles and first increasing then decreasing with increase of slope angle while other effective factors are not varying.