路堤桩板式挡土墙的振动台试验研究
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摘要
研究目的:以西南某铁路路堤为原型,按照Bockinghamπ定理,设计路堤桩板式挡土墙振动台模型。通过振动台试验,分析桩板式挡土墙对地震加速度的位移响应规律,给出地震作用下桩的动力响应规律,同时检验加筋处治高坡度路堤的抗震效果,从而为路堤桩板结构抗震稳定性的分析与评价提供依据。研究结论:随着加速度的增大,桩顶水平位移峰值以及桩身动应变峰值随之增大;桩身最大动应力出现在土层分界面下部,并且在分界面处,分界面上部和下部在振动过程中,振动方向存在相差;在地震情况下加筋能够有效地减少土体对锚固桩的动力作用;桩板墙结构抗震稳定性能较好,能满足高烈度地震区的工程抗震设计要求。
Research purposes: According to the Bockingham π theorem,the model of the shaking table of pile-type retaining wall was designed for the embankment of one railway in the southwest Chin.By the shaking table test,the analysis of the displacement responses laws of pile-type retaining wall to the earthquake acceleration was made to get the dynamic response laws of the pile under the effect of earthquake and check the anti-seismic effect of reinforcing the high-slope embankment for the purpose of providing the basis for analysis and evaluation of the anti-seismic stability of the pile-type structure of the embankment. Research conclusions:The horizontal displacement peak of the pile top and the dynamic strain peak of the pile body increased;with the increase of the acceleration.The maximum dynamic stress of the pile appeared in and under the boundary surface.There was a difference in the vibration direction between the upper and the lower boundary surfaces in vibration process.Under the seismic condition,adding the reinforcement could effectively reduce the dynamic effect of soil on the anchor pile.The pile-type retaining wall structure had a good anti-seismic property and met the anti-seismic design demand of the engineering in the high seismic intensity zone.
Research purposes: According to the Bockingham π theorem,the model of the shaking table of pile-type retaining wall was designed for the embankment of one railway in the southwest Chin.By the shaking table test,the analysis of the displacement responses laws of pile-type retaining wall to the earthquake acceleration was made to get the dynamic response laws of the pile under the effect of earthquake and check the anti-seismic effect of reinforcing the high-slope embankment for the purpose of providing the basis for analysis and evaluation of the anti-seismic stability of the pile-type structure of the embankment. Research conclusions:The horizontal displacement peak of the pile top and the dynamic strain peak of the pile body increased;with the increase of the acceleration.The maximum dynamic stress of the pile appeared in and under the boundary surface.There was a difference in the vibration direction between the upper and the lower boundary surfaces in vibration process.Under the seismic condition,adding the reinforcement could effectively reduce the dynamic effect of soil on the anchor pile.The pile-type retaining wall structure had a good anti-seismic property and met the anti-seismic design demand of the engineering in the high seismic intensity zone.
引文
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[8]铁道部第一勘察设计院.路基[M].北京:中国铁道出版社,1995.The Ministry of Railways First Survey and DesignInstitute.Railway Roadbed[M].Beijing:ChinaRailway Publishing House,1995.
[2]WEGNER J L.Dynamic Wave-soil-structureInteraction Analysis in the Time Domain[J].Computerand Structures,2005(83):2206-2214.
[3]刘志强,等.地铁隧道下卧土体动力特性模型试验研究[J].铁道工程学报,2011(9):94-96.Liu Zhiqiang.Model Test Research on DynamicCharacteristics of the Underlying Soil for SubwayTunnel[J].Journal of Railway Engineering Society,2011(9):94-96.
[4]陈国兴,等.土-地铁隧道动力相互作用的大型振动台试验:试验方案设计[J].地震工程与工程振动,2006(6):178-182.Chen Guoxing.A Large-scale Shaking Table Test forDynamic Soil-metro Tunnel Interaction:Analysis of TestResults[J].Earthquake Engineering and EngineeringVibration,2006(6):178-182.
[5]蒋录珍,等.地下综合管廊结构振动台模型试验与有限元分析研究[J].地震工程与工程振动,2010(4):555-567.Jiang Luzhen,etc.Seismic Response of UndergroundUtility Tunnels:Shaking Table Testing and FEMAnalysis[J].Earthquake Engineering and EngineeringVibration,2010(4):555-567.
[6]周颖.高层混合结构的振动台模型试验研究[J].地震工程与工程振动,2009(8):47-49.Zhou Ying.Shake Table Testing of a Multi-towerConnected Hybrid Structure[J].Earthquake Engineeringand Engineering Vibration,2009(8):47-49.
[7]杨林德,王国波,等.地铁车站接头结构振动台模型试验及地震响应的三维数值分析[J].岩土工程学报,2007(12):1893-1894.Yang Lindeng,Wang Guobo.Shaking Table Tests onSubway Station Joint Structure and 3D NumericalSimulation of Seismic Response[J].China Journal ofGeotechnical Engineering,2007(12):1893-1894.
[8]铁道部第一勘察设计院.路基[M].北京:中国铁道出版社,1995.The Ministry of Railways First Survey and DesignInstitute.Railway Roadbed[M].Beijing:ChinaRailway Publishing House,1995.
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