抗滑桩加固边坡稳定性分析及优化研究

利用FLAC^3D分析抗滑桩在边坡中的加固效果,探讨在抗滑桩—边坡体系中,设桩位置、桩长、桩体弹性模量等因素对边坡稳定系数、桩体受力及变位响应的影响。研究结果表明,抗滑桩的最优设桩位置受桩长的影响较大,若桩长较短,则布设抗滑桩于边坡中部具有最好的加固效果,若桩长较长,则在边坡中上部设桩对边坡稳定性更有利;随着抗滑桩位置向坡顶移动,桩身内力、桩体挠度先增大后减小,并在边坡中下部同一位置达到最大值,同时,随着抗滑桩桩长的增大,桩体剪力变化很小,在抗滑桩加固边坡工程中,存在有效嵌固深度H,在H以内,边坡稳定系数和桩长的关系符合抛物线特征,且H受设桩位置的影响;提高抗滑桩弹性模量可小幅度减小桩体挠度,但并不能提高边坡稳定系数,故在抗滑桩工程设计时,应合理确定桩身弹性模量。

Study on stability analysis and optimization of slope reinforced with anti-slide piles

FLAC^3D is used to analyze the reinforcement effect of anti slide pile in slope,and the influence of pile location,pile length,pile elastic modulus and other factors on slope stability coefficient,pile stress and displacement response in anti slide pile slope system is discussed.The results show that the optimal location of anti slide pile is greatly affected by the pile length.If the pile length is short,the anti slide pile in the middle of the slope has the best reinforcement effect.If the pile length is long,the pile in the middle and upper part of the slope is more beneficial to the stability of the slope.As the position of the anti slide pile moves towards the top of the slope,the internal force of the pile body and the deflection of the pile body first increase and then decrease,and reach the maximum value at the same position in the middle and lower part of the slope.At the same time,with the increase of the length of the anti slide pile,the change of the pile shear force is very small.In the anti slide pile reinforcement project,there is an effective embedded depth H.Within H,the relationship between the slope stability coefficient and the pile length conforms to the parabolic characteristics,and H is affected by the pile location.Increasing the elastic modulus of anti slide pile can reduce the deflection of pile body slightly,but it can not improve the slope stability coefficient.Therefore,the elastic modulus of pile body should be reasonably determined in the design of anti slide pile engineering.