悬臂抗滑桩加固边坡地震动力响应模型试验研究
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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。
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.
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.
引文
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[8]苏栋,李相菘.水平多向荷载下桩-土相互作用初探[J].岩土力学,2008,29(3):603-608.SU Dong,LI Xiang-song.Preliminary study on soil-pileinteraction under multidirectional horizontal loading[J].Rock and Soil Mechanics,2008,29(3):603-608.
[2]姚爱军,苏永华.复杂岩质边坡锚固工程地震敏感性分析[J].土木工程学报,2003,36(11):34-37.YAO Ai-jun,SU Yong-hua.A method for stability ofslope engineering with complication rock-mass[J].ChinaCivil Engineering Journal,2003,36(11):34-37.
[3]陈生水,邹广电,徐光明.丰都楠竹崩滑体防治方案研究[J].岩石力学与工程学报,2005,(11).CHEN Sheng-shui,ZOU Guang-dian,XU Guang-ming.Study on treatment scheme of Nanzhu landslide inFengdu county[J].Chinese Journal of Rock Mechanicsand Engineering,2005,(11).
[4]于玉贞,邓丽军.抗滑桩加固边坡地震响应离心模型试验[J].岩土工程学报,2007,29(9):1320-1323.YU Yu-zhen,DENG Li-jun.Centrifuge modeling ofseismic behavior of slopes reinforced by stabilizingpile[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1320-1323.
[5]于玉贞,李荣建,李广信,等.抗滑桩静力与动力破坏离心模型试验对比分析[J].岩土工程学报,2008,30(7):1090-1093.YU Yu-zhen,LI Rong-jian,LI Guang-xin,et al.Centrifuge modeling of static and dynamic failure ofstabilizing piles in slope[J].Chinese Journal ofGeotechnical Engineering,2008,30(7):1090-1093.
[6]祁生文,伍法权.边坡动力响应规律研究[J].中国科学(E辑技术科学),2003,33(增刊):28-40.QI Sheng-wen,WU Fa-quan.The regularity of responseof slope dynamic[J].Science in China Series E,2003,33(Supp.):28-40.
[7]徐光兴,姚令侃,高召宁,等.边坡动力特性与动力响应的大型振动台模型试验研究[J].岩石力学与工程学报,2008,27(3):624-632.XU Guang-xing,YAO Ling-kan,GAO Zhao-ning,et al.Large-scale shaking table model test study on dynamiccharacteristics and dynamic responses of slope[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):624-632.
[8]苏栋,李相菘.水平多向荷载下桩-土相互作用初探[J].岩土力学,2008,29(3):603-608.SU Dong,LI Xiang-song.Preliminary study on soil-pileinteraction under multidirectional horizontal loading[J].Rock and Soil Mechanics,2008,29(3):603-608.
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