【摘要】 为研究悬臂抗滑桩加固边坡的地震响应和抗滑桩桩身弯矩分布规律,利用北京工业大学结构实验室的大型振动台进行悬臂抗滑桩加固边坡模型的振动试验。在试验过程中,输入汶川地震重华镇波,记录边坡不同位置加速度的时程变化,并作对比分析,采集抗滑桩桩身的应变,用于分析桩身弯矩分布。结果表明,地震过程中边坡内部加速度自下而上逐渐放大,边坡顶部放大效果达到最大;悬臂抗滑桩的加固效应和桩间土体成拱作用使附近土体的动力响应受到限制;抗滑桩的嵌固端与悬臂部分分界面随着地震波的输入应变急剧增大,而悬臂部分随着高度增加应变减小,反映了悬臂抗滑桩弯矩的"凸"形分布规律。更多还原

【Abstract】 For researching seismic response and piles’ bending moment distribution regularity of the slope reinforced by cantilever stabilizing pile,some seismic response model experiments of slope reinforced by cantilever stabilizing pile were carried out by using large-scale shaking table in Beijing University of Technology’s Structures Laboratory.During the experiments,inputted earthquake motion of Chonghua town,recorded the time course of changes of the acceleration of the slope at different positions and made comparative analysis and collected strain of the pile so as to analyze the bending moment distribution of the pile.The results show that: in the process of earthquake,the slope acceleration enlarged from the bottom to the top;and the enlarged effect of slope top achieved maximum.The reinforcement effect and the soil arching effect of cantilever stabilizing pile restrict the dynamic response of the soil near the pile.The strain of the interface between the mounted side and the cantilever part of the pile increases rapidly as the input of seismic wave;the strain of the cantilever part decreases with the increase in height;those reflect the convex distribution regularity of the bending moment of the cantilever sliding pile.更多还原