土拱效应是抗滑桩等类型的非连续支挡结构能够产生连续性支护效果的前提。在抗滑桩支护体系中，桩后岩土体在下滑推力的作用下，内部产生不均匀的位移使土体应力方向发生改变，从而自发形成土拱，桩体作为拱脚承受拱体传递的下滑推力。目前针对抗滑桩桩间的拱效应，研究人员进行了大量的对比研究，但基于土拱效应的抗滑桩桩间挡土板上土压力研究较少，然而挡土板作为抗滑桩支护体系中一个重要组成部分，其面积较大，在结构中占有很大比重，设计挡土板时，如果忽略土拱效应的影响，势必造成极大的浪费。在这样的背景下，基于土拱效应的抗滑桩桩间挡土板上土压力研究显得很有必要。 本文在掌握抗滑桩支挡体系中水平卸荷拱形成条件的背景下，通过FLAC3D数值模拟软件建立三维抗滑桩数值模型，并选取桩间中轴线上x向应力、y向应力以及桩背纵剖面上x向应力的变化规律进行分析，通过一系列的对比分析，对抗滑桩桩后土体的应力拱产生过程和形成机理进行研究；同时，利用FLAC3D数值计算软件建立三维滑坡模型，在不同桩间距、悬臂段不同深度下对抗滑桩桩间拱效应进行分析研究，得出在上述条件参数下抗滑桩桩后土拱效应的变化规律，并与前人的研究成果进行对比；在对桩间拱效应有一定认知的基础上，抗滑桩间添加挡土板，并改变挡土板位置，对其桩后拱效应的变化规律进行研究，进而对挡土板不同位置下，其上土压力的变化规律进行对比分析。 最后，在已得到的研究成果上，结合工程实例，建立三维数值计算模型，对抗滑桩与周围土体相互作用的数值模拟进行分析探讨，并对滑坡治理效果进行评价。并结合经验公式进行挡土板上土压力理论计算，并将其计算结果与数值模型模拟结果进行比较，通过一系列的对比分析，为桩间挡土板的合理设置提供一定的建议。

The soil arch effect is anti-slide pile, such as type of discontinuous retaining structure can produce continuous supporting effect.In the anti-slide pile supporting system, after pile in rock and soil mass falling under the action of thrust, resulted from uneven displacement internal stress direction change of soil, soil arch, and spontaneous pile as the decline in the arch foot donor transfer under thrust.At present in view of the arch effect between anti-slide piles, the researchers conducted a lot of comparative study, but based on the soil arch effect between anti-slide piles of soil retaining plate on earth pressure study is less, but the soil retaining plate as the anti-slide pile supporting system is an important part of the larger area, occupies a large proportion in the structure, design of soil retaining plate, if you ignore the influence of the soil arch effect, will inevitably cause enormous waste.Under such a background, based on the soil arch effect between anti-slide piles of soil retaining plate on earth pressure studies seem to be very necessary. This article uses FLAC3D numerical software three-dimensional landslide model is set up.the main work content is as follows:In master of anti-slide pile retaining system level under the background of unloading arch into conditions, by FLAC3D numerical simulation software to establish a three dimensional numerical model of anti-slide pile and pile to stress on the central axis x, y to stress and x to pile back longitudinal stress is analyzed, the change rule of through a series of comparative analysis, of anti-slide pile soil stress arch produce process and the formation mechanism of research;Using FLAC3D numerical calculation software to establish a three-dimensional model of the landslide,in different pile spacing, the cantilever under the different depth of research and analyze the arch effect between anti-slide piles,it is concluded that under the above condition parameters been arch effect of anti-slide piles, and compared with the research achievements of predecessors;In arch effect between the piles have certain cognitive, on the basis of adding soil retaining plate between anti-slide pile, and change the soil retaining plate position, after the pile to study the change rule of arch effect, and then to soil retaining plate under different position, the change rule of earth pressure on the comparative analysis; Finally,on the research achievements of have been,in combination with project example,the three-dimensional numerical calculation model is established, the soil around the pile and the paper discusses the numerical simulation of the interaction, and evaluate the effect of landslide treatment. combining with the experience formula for earth pressure theory calculation on soil retaining plate, and the calculated results compared with the results of numerical model, through the analysis of relevant research, the reasonable setting of pile soil retaining plate between certain Suggestions.