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采用FLAC3D软件建立了悬臂桩桩板墙的有限差分模型,通过改变挡土板的位置和刚度,对比研究桩板后土拱效应的变化规律,以探求有利于土拱效应发挥的合理设板位置和板体刚度。结果表明,设板位置越靠近桩前或板体刚度越小,土拱效应越强且分布范围越广。设板位置和板体刚度两因素对土拱效应的影响存在相互耦合,当板体刚度越小时,设板位置对土拱效应的影响越剧烈,反之亦然。相对板体刚度而言,设板位置对土拱效应的影响程度更大,因而是最重要的控制因素。土拱效应越强,则土拱能将更多的滑坡推力传递至两桩,相应地减少了作用于挡土板的土压力,从而降低了对挡土板的结构强度要求,有利于节省工程投资。
By using FLAC3D software, the finite difference model of cantilever pile wall is established. By changing the position and stiffness of the soil plate, the change rule of soil arching effect after pile is compared, so as to explore the reasonable plate position which is conducive to soil arching effect And plate stiffness. The results show that the closer the plate is located to the front of the pile or the smaller the stiffness of the plate body, the stronger the soil arching effect and the wider the distribution range. When the stiffness of the plate body is small, the influence of the plate position on soil arching effect is more violent, and vice versa. Relative to the stiffness of the plate body, the influence of the plate position on the soil arching effect is greater, and therefore is the most important control factor. The stronger the soil arching effect, the more the soil arching can transfer more landslide thrust to two piles, accordingly reducing the earth pressure acting on the earth slab, thus reducing the structural strength requirements of the earth slab, saving engineering investment.