不同锚点工况抗滑桩加固边坡的抗震对比分析

Comparative analysis of antiseismic behavior of slope reinforced by anti slide piles under different anchorage conditions

依托某高速公路边坡工程,采用数值模拟的方法对单锚点和双锚点抗滑桩的抗震稳定性进行了分析,明确了预应力锚索抗滑桩加固边坡对边坡稳定性的提升效果显著。在地震荷载工况下,单锚点抗滑桩边坡稳定系数的降低与地震波峰值加速度变化相关,峰值加速度越大,边坡稳定性降低越快,预应力锚索抗滑桩对地震荷载具有良好的适应性,能在一定波峰加速度范围内适应地震作用,保持边坡的稳定性。同时明确了单锚点抗滑桩的最大弯矩值位于桩身高度14m处,双锚点抗滑桩有利于减小桩身的水平位移和弯矩值,双锚点抗滑桩的最大水平位移值位于桩顶1.25cm处,较单锚点桩身水平位移最大值减小3.35cm。

Based on an expressway slope project,this paper analyzes the seismic stability of single anchor and double anchor anti slide piles by using numerical simulation method,and makes clear that the reinforcement effect of prestressed anchor anti slide piles on slope stability is significantUnder seismic load conditions,the reduction of slope stability coefficient of single anchor anti slide pile is related to the change of peak acceleration of seismic waveThe greater the peak acceleration is,the faster the slope stability decreasesThe prestressed anchor anti slide pile has good adaptability to seismic load and can adapt to seismic action within a certain range of peak acceleration to maintain slope stabilityAt the same time,it is clear that the maximum bending moment value of single anchor anti slide pile is located at the pile height of 14 m,The double anchor anti slide pile is conducive to reducing the horizontal displacement and bending moment of the pile bodyThe maximum horizontal displacement of the double anchor anti slide pile is 1.25 cm at the pile top,which is 3.35 cm less than the maximum horizontal displacement of the single anchor pile body.