中文摘要：

对一大型土坡加固设计的宽平台设置宽度、最优位置、多个宽平台组合方案及其实施效果进行优化分析，揭示了边坡宽平台分解效应的力学机理和演化规律，得出以下结论：通过在大型边坡中部设置宽平台，将其潜在整体剪切变形带分解成相对独立的非贯通剪切带，可将边坡整体失稳机制转化为被宽平台分割形成的若干块体的局部失稳，从而实现宽平台的分解效应；随着分解平台宽度递增，边坡整体稳定度稳步提高，当宽平台增至一定宽度以后，边坡稳定安全系数趋于稳定，可据此确定最优平台宽度；宽平台的高度位置选择在边坡中上部实施效果较显著，当宽平台位置过于靠下时常常难以发挥作用；多个宽平台组合效果与边坡坡体结构特征、宽平台的设置宽度、设置位置和设置个数等因素有关，实际工作中需要大量的计算对比综合确定；宽平台设置方案可以采用较少的加固工程量使边坡支护取得更好的实施效果，并且更有利于保证边坡实施过程中的安全。

英文摘要：

Research has been conducted toward the width and the optimal location of the widened platform,designed to reinforce the large slope,and toward the multi-platform combination scheme and the optimizing analysis for better outcomes.Based on that,the paper unveils the mechanical mechanism and the separating pattern for the resolving effect of the widened platform and the following can be concluded . The installation of widened platform breaks the potentially-integrated shear deformation area into relatively-separated parts,in other words it changes the stability-failure mechanism of the slope as a whole into that of different parts separated by the platform ,so as to realise the separating effect.The stability of the slope goes up with the increase of the width of the platform and it later reaches a stable level,which determines the optimal width.The platform is recommended to be placed at the middle or at the upper part of the slope,which has been proved to deliver a better outcome.Otherwise,the result can not be guaranteed.The effect of multi-platform combination is in relation with factors like the slope structure,the width of the widened platform,the designated location and quantity;therefore large amount of calculations and comparison is required in its application .The widened-platform reinforcement scheme involved little amount of materials for an acceptable outcome and the method preferably ensures the construction safety during the process.