抗滑桩加固边坡稳定性分析及其优化

来源期刊:中南大学学报(自然科学版)2015年第1期

论文作者:王聪聪 李江腾 廖峻 郝瑞卿 刘博

文章页码:231 - 238

关键词:边坡稳定性;抗滑桩;数值分析;临界滑移面;弹性模量;优化

Key words:slope stability; pile; numerical analysis; critical slip plane; elastic modulus; optimization

摘    要:利用数值方法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、临界滑移面以及桩体的内力、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,在移动过程中,边坡临界滑动面逐渐往临坡面移动,当移动到边坡中上部时,滑移面位置发生突变;随着抗滑桩桩长的增大,桩身弯矩随之增大,而桩体剪力变化很小,在抗滑桩加固边坡工程中,存在一有效嵌固深度Heed,在Heed以内,边坡稳定系数和桩长的关系符合抛物线特征,同时,Heed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,应综合考虑,合理确定桩身弹性模量。

Abstract: The reinforcement effect of the pile on slope was studied by the numerical analysis method. The influence of some key factors in the pile-slope system, such as pile location, pile length and pile elastic modulus on the factor of safety, the critical slip surface of slope and bending moments, shear force, horizontal displacement of pile were discussed. The results show that the optimal pile location is influenced by its length. If the pile length is short, pile should be inserted in the middle of slope surface; when the pile length is long, pile should be inserted in the higher part of slope. When the pile location is close to the top of the slope, bending moments, shear force and horizontal displacement of pile increase at first then decrease, and they reach the maximum at the same location of pile. Meanwhile, the slope critical slip plane moves towards slope surface. When pile is inserted in the middle-upper part of slope, the location of the slip plane changes abruptly. With the increase of pile length, bending moments of pile increases as well while shear force almost keeps invariant. In the slope with pile reinforcement, there exists an effective embedded depth Leed. Before the pile length reaches Leed, the relationship between the factor of safety and pile length shows a parabolic curve. Leed is influenced by pile length. The increase of pile elastic modulus will reduce pile horizontal displacement slightly while the factor of safety doesn’t increase accordingly. So, reasonable elastic modulus of pile should be chosen in the pile design.

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