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中文摘要：
依据悬臂式抗滑桩的受力特点，研究了桩间土拱效应的形成机理。相比埋入式抗滑桩，悬臂式抗滑桩桩间土拱按其作用形式可分为水平拱、竖向拱及临空面拱，其中水平拱效应对桩间土的稳定起主控作用。考虑到桩间土稳定的前提下桩后土压力将完全由桩身承担，建议采用σx突变效应替代常用的桩一土承载比衡量桩间土拱效应的发挥程度。通过建立悬臂式抗滑桩的三维有限元模型，对比了悬臂式抗滑桩三维分析与二维分析结果的差异，并指出悬臂桩土拱效应极具空间特性，不宜忽略自重应力的影响。继而重点研究了悬臂高度、桩间距、桩正截面宽度、附加荷载及土体抗剪强度对桩间土拱效应的影响。
英文摘要：
The forming mechanism of soil arching effect between cantilever anti-slide piles is studied based on their forced characteristics. Comparing with embedded piles, the soil arching effect between cantilever piles may be divided into three categories such as level arch, vertical arch and free air arch, moreover, the effect of the level arch is the most critical to soil stability among them. In order to account the arching effect, it is suggested that the wave of σx should be considered to substitute for the ratio of loads on the pile and soil. The contrast between 2D and 3D calculations is made by establishing 3D-FEM. The influence from the geostatic stress couldn ＇ t be ignored, because there is the remarkable dimensional feature in the arching effect of cantilever piles. Some relationships between the arching effect and parameters such as cantilever height, pile spacing, face width, superload and shear strength of soil are emphatically studied.
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