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中文摘要：
为了探讨路堑边坡悬臂式抗滑桩的合理间距问题，考虑到自重应力的存在及桩间土的受力特点，根据桩间滑体自身的强度条件及土拱的轴向应力与拱跨的关系，建立了三维计算模型；推导出悬臂式抗滑桩的临界高度与最大桩间净距的计算公式，并结合计算公式研究了桩间距对相关参数的敏感度，模拟了桩间土拱效应沿高度分布的空间形态，分析了桩后土拱效应的影响范围；通过工程实例对推导的合理桩间距计算方法进行了验证。结果表明：实际设计值与计算结果基本一致，在对悬臂式桩土拱效应进行研究时应建立三维模型。
英文摘要：
Aimed at problems about the appropriate spacing calculation of cantilever anti-slide pile in chasm slope repelling engineering, its three-dimensional （3-D） calculation model was established by considering presence of geostatic stress and mechanical characteristics about soils between piles, which is based on soil strength condition of sliding body and the relationship between axial stress and arch span. The formulae of critical height and the maximum of clear spacing between adjacent piles were obtained, and their correlations were also discussed. Combined with the formulae, sensitivities of spacing of pile to relative parameters were studied. The distribution shape of soil arching effect along vertical direction was simulated, and its range of influence which located just behind piles was also analyzed. Finally, the calculation model of appropriate spacing was verified by evidence from real engineering which was consistent with the result; 3-D model should be established in study of cantilever soil arching effect.
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