框架锚杆支护边坡地震响应分析
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摘要
研究框架锚杆支护边坡的动力特性和抗震机理,包括边坡竖向地震响应、水平地震响应,框架的地震响应,锚杆的地震响应,土压力地震响应.考虑土体与支护结构相互作用及其协同工作建立三维有限元模型,分析双向地震激励下框架锚杆支护边坡的动力响应,给出地震波和阻尼的选取方法.结果表明:在地震作用下边坡发生了永久位移,表明支护边坡延性大、有很好的抗震性能;锚杆轴力沿全长变化不均匀,在滑移面附近幅度最大;每层锚杆的增幅也不相同,中间几层增幅大,上下两层增幅小;框架内力和土压力在地震作用下明显增大.
The dynamic characteristics and anti-seismic mechanism of the slope supported with framed anchor were investigated,where the vertical seismic response of the side-slope,its horizontal response to earthquake,and the seismic response of frames,anchors,and earth pressure were included.A three-dimensional finite element model was set up for the interaction and cooperation of soil-body with supporting structure,so that the dynamic response analysis of the slope supported with framed anchors and excited two-way earthquake could be performed and the selection method of earthquake wave and damping was given.The results shown that a permanent displacement of the side-slope occurred under the action of earthquake,showing that the ductility of supported side-slope was great and possessed fine anti-seismic performance.The variation of axial force of the anchor was non-uniform,its range being maximal near the slip-surface.The increments of axial force from layer to layer in the anchor were different also,being bigger among the middle layers and smaller at the top and bottom layers.The inner force of the frame and soil pressure increased remarkably under the action of earthquake.
The dynamic characteristics and anti-seismic mechanism of the slope supported with framed anchor were investigated,where the vertical seismic response of the side-slope,its horizontal response to earthquake,and the seismic response of frames,anchors,and earth pressure were included.A three-dimensional finite element model was set up for the interaction and cooperation of soil-body with supporting structure,so that the dynamic response analysis of the slope supported with framed anchors and excited two-way earthquake could be performed and the selection method of earthquake wave and damping was given.The results shown that a permanent displacement of the side-slope occurred under the action of earthquake,showing that the ductility of supported side-slope was great and possessed fine anti-seismic performance.The variation of axial force of the anchor was non-uniform,its range being maximal near the slip-surface.The increments of axial force from layer to layer in the anchor were different also,being bigger among the middle layers and smaller at the top and bottom layers.The inner force of the frame and soil pressure increased remarkably under the action of earthquake.
引文
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[2]朱彦鹏,王秀丽,狄生奎,等.黄土边坡建筑抗滑设计[J].甘肃工业大学学报,2002,28(2):85-89.
[3]李忠,朱彦鹏.框架预应力锚杆边坡支护结构稳定性计算方法及其工程应用[J].岩石力学与工程学报,2005,24(21):3 922-3 926.
[4]HATEKEYAMA I.Consideration on the dynamical behaviorof earth dams,Bul.No.52[R].Kyoto:Disaster ProventionResearch Inst.of Kyoto University,1963.
[5]CLOUGH R W,CHOPRA A K.Earthquake stress analysis inearth dams[J].J Engng Mech,ASCE,1996,92(EM2):56-61.
[6]程火焰,周亦唐,钟国强.加筋土挡土墙地震动力特性研究[J].公路交通科技,2004,21(9):16-20.
[7]LING H,LIU H,KALIAKIN V,et al.Analyzing dynamic be-havior of geosynthetic-reinforced soil retaining walls[J].Jour-nal of Engineering Mechanics,ASCE,2004,130(8):911-920.
[8]胡聿贤.地震工程学[M].北京:地震出版社,1988.
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