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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。
In order to study the seismic response of cantilevered anti-slide piles and the bending moment of anti-slide piles, the vibration test of the cantilever anti-slide piles reinforced slope model is carried out by the large-scale vibration table of the structural laboratory of Beijing University of Technology. During the test, the heavy huabao waves of Wenchuan earthquake were input to record the time-course changes of acceleration at different positions of the slope, and comparative analysis was made to collect the strain of the anti-slide pile for analyzing the bending moment distribution of the pile. The results show that the internal acceleration of the slope gradually enlarges from bottom to top during the earthquake, and the magnifying effect at the top of the slope reaches the maximum. The strengthening effect of the cantilever anti-slide pile and the soil arching between the piles restrict the dynamic response of the nearby soil. The interface between the embedded end and the cantilever part of anti-slide pile increases sharply with the input of seismic wave, while the cantilever part decreases with the increase of height, which reflects the law of “convex ” distribution of cantilever anti-slide pile bending moment .