采用FLAC3D软件,建立了抗滑桩结构工程中摩擦拱、端承拱和联合拱3种数值模型。对比研究3种拱在形成发育、拱强度影响因素及规律等方面的异同,探讨了两单独拱的联合机制。结果表明,联合拱发育以摩擦拱形成为始点、以端承拱破坏为终点,两单独拱并存且各有明显的主导区。联合拱的分布区域、极限承载力和塑性区分布均可近似为两单独拱情况的叠加,且端承拱在其中占较大比例。不同影响因素对同种拱的影响性质及影响程度均存在差异,同一影响因素对不同拱的影响性质一致但影响程度不同。联合拱的分拆和两单独拱的联合,提供了研究土拱效应的新路径,有利于认识的深化和细化。 Using FLAC3D software, three kinds of numerical models of friction arch, end bearing arch and joint arch are established in anti-slide pile structure engineering. The similarities and differences of the three kinds of arch in the development and development, the influencing factors and regularity of arch strength were compared and analyzed. The joint mechanism of two separate arch was discussed. The results show that the joint arch develops with the friction arch as the starting point, the end bearing arch destruction as the end point, two separate arch coexist and each has obvious dominant zone. The distribution area, ultimate bearing capacity and plastic zone distribution of the united arch can be approximated by the superposition of two separate arch conditions, with the end bearing arch occupying a large proportion. There are differences in the nature and degree of influence of different influencing factors on the same kind of arch. The same influencing factors have the same impact on different arches but different degrees of influence. The joint arch split and the union of two separate archs provide a new way to study the effect of soil arching, which is conducive to the deepening and refinement of understanding.