基于强度折减法的边坡防护工程动力分析

Dynamic Analysis of Slope Protection Project Based on Strength Reduction Method

文章依托某高速公路高边坡路堑工程,采用有限元软件,对全埋式预应力锚索抗滑桩的变形和边坡稳定性进行分析,明确了边坡潜在滑动面位置,并对各模拟阶段的边坡稳定性进行了计算。计算得到各模拟阶段边坡变化情况,其中削坡使边坡的稳定性提高11.8%,支护结构则提升了34.1%。在地震荷载分析中发现,边坡对地震荷载的承受能力受边坡承受能力的影响,在承受能力范围内,边坡稳定性下降较慢,在承受能力范围外下降较快;而桩顶的水平位移与各地震阶段内边坡的稳定性相关,抗滑桩在峰值加速度下的桩身弯矩值呈“S”形变化。

Relying on the high slope cutting project of an expressway,the deformation and slope stability of the anti-slide pile for the fully-buried prestressed anchor cable are analyzed by using the finite element software,the position of the potential sliding surface of the slope is clarified,and the slope stability in each simulation stage is calculated.The slope changes in each simulation stage are calculated,in which the slope stability is increased by 11.8%through the cut slope and the supporting structure is increased by 34.1%.In the seismic load analysis,it is found that the bearing capacity of the slope to the seismic load is affected by that of the slope,and the stability of the slope decreases slowly within the bearing capacity range,and decreases faster outside the bearing capacity range.The horizontal displacement of the pile top is related to the slope stability in each seismic stage,and the bending moment value of the anti-slide pile under the peak acceleration shows an"S"shape.