某失稳边坡的稳定性及加固效果研究

Study on the stability and reinforcement effect of an unstable slope

以某公路失稳边坡为研究对象,采用Bishop法计算了边坡5个代表性剖面的稳定性系数,根据稳定性计算结果提出了“削坡+锚杆格构梁+排水沟+坡面绿化”的边坡治理措施。为验证治理措施的有效性,以稳定系最差的I-I’剖面为例建立三维网格计算模型,利用有限差分法计算了天然工况和暴雨工况下边坡位移量分布结果。数值模拟结果显示,边坡加固前,在天然工况和暴雨工况下的最大水平位移量分别为26.3 mm和28.9 mm,最大竖向位移量分别为19.2 mm和22.1 mm;边坡加固后在天然工况和暴雨工况下的最大水平位移分别为10.7 mm和11.5 mm,最大竖向位移分别为14.3 mm和16.8 mm。在天然工况和暴雨工况下,加固后对比加固前坡面位移分别降低了40.56%和39.83%,坡体位移分别降低了54.37%和58.13%。对比加固前和加固后的坡体位移结果可知锚杆格构梁加固有效抑制了坡体变形。加固后的坡体地表位移监测结果均在安全范围内,表明所提出的边坡加固措施对该边坡具有良好的加固效果。本研究可为类似边坡加固工程提供一定的参考。

Taking an unstable highway slope as the study object,the stability coefficient of five representative profiles is calculated with the Bishop method.Based on the stability calculation result,a treatment measure of"slope cutting+anchor bar lattice beam+drainage ditch+slope surface greening"is proposed.To verify the effectiveness of the treatment measure,a three-dimensional grid calculation model is established using the least stable I-I'profile as an example.The displacement distribution results of the slope under natural and rainy condition are calculated with the finite difference method.The numerical simulation result shows that before slope reinforcement,the maximum horizontal displacement under natural condition and rainstorm condition is 26.3 mm and 28.9 mm,respectively,and the maximum vertical displacement is 19.2 mm and 22.1 mm,respectively.After slope reinforcement,the maximum horizontal displacement under natural and rainstorm condition is 10.7 mm and 11.5 mm,respectively,and the maximum vertical displacement is 14.3 mm and 16.8 mm,respectively.Under the natural condition and rainstorm condition,the slope displacement before and after reinforcement decreases by 40.56%and 39.83%,respectively,and the slope displacement decreases by 54.37%and 58.13%,respectively.The comparison between the displacement results before and after reinforcement proves that the anchor bar lattice beam reinforcement has effectively suppressed the slope deformation.The monitoring results of surface displacement of the reinforced slope are all within the safety range,indicating that the proposed slope reinforcement measures have a good reinforcement effect on the slope.This study can provide a certain reference for the similar slope reinforcement project.