桩板结构路基桩-土工作特性
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摘要
为了掌握在列车荷载作用下无碴轨道桩板结构路基的工作性状,以遂渝高速铁路为背景,通过室内大比例动态模型试验,加载频率为5 Hz,激振20万次,研究了桩板结构路基桩-土工作特性变化规律。试验结果表明:在荷载激振1万次后,动位移幅值、桩身轴力、桩间土动应力随着振动次数的增加几乎不变,桩-土共同作用趋于稳定;桩间土的动应力沿深度近似呈"K"形分布,与土体相比,桩分担了大多数动力荷载,激振位置对动应力有影响;桩基加深了基床的动力影响范围,改善了路基土体的受力状态。
In order to investigate the mechanical behavior of pile-plank embankment for high-speed ballastless track under moving load,based on Suining-Chongqing High-speed Railway,the pile-soil interaction characteristics of pile-plank embankment were researched by indoor great scale dynamic model test,in which the loading frequency is 5 Hz and the loading times are 2×105.Test result indicates that the amplitude of dynamic displacement,pile shaft force,dynamic stress in soil between piles remain constant after 1×104 times of vibrant loading,and pile-soil interaction tends toward stability.The amplitude curve of dynamic stress is approximately "K" form with the depth in soil between piles,piles share most dynamic stress compared with soil,and dynamic stress is affected by loading position.Pile structure expands the depth of the dynamic response of roadbed and improves the stress state of roadbed soil.1 tab,7 figs,11 refs.
In order to investigate the mechanical behavior of pile-plank embankment for high-speed ballastless track under moving load,based on Suining-Chongqing High-speed Railway,the pile-soil interaction characteristics of pile-plank embankment were researched by indoor great scale dynamic model test,in which the loading frequency is 5 Hz and the loading times are 2×105.Test result indicates that the amplitude of dynamic displacement,pile shaft force,dynamic stress in soil between piles remain constant after 1×104 times of vibrant loading,and pile-soil interaction tends toward stability.The amplitude curve of dynamic stress is approximately "K" form with the depth in soil between piles,piles share most dynamic stress compared with soil,and dynamic stress is affected by loading position.Pile structure expands the depth of the dynamic response of roadbed and improves the stress state of roadbed soil.1 tab,7 figs,11 refs.
引文
[1]詹永祥,蒋关鲁,牛国辉,等.高速铁路无碴轨道桩板结构路基模型试验研究[J].西南交通大学学报,2007,42(4):400-403,408.ZHAN Yong-xiang,JI ANG Guan-lu,NI U Guo-hui,et al.Model test investigation of pile-plank embankment of ballast-less truck for high-speed rail way[J].Journal of SouthwestJiaotong University,2007,42(4):400-403,408.(in Chinese)
[2]詹永祥,蒋关鲁,牛国辉,等.桩板结构路基动力模型试验研究[J].岩土力学,2008,29(8):2097-2101,2110.ZHAN Yong-xiang,JI ANG Guan-lu,NI U Guo-hui,et al.Model experi mental research on dynamic performance of pile-plank embankment[J].Rock and Soil Mechanics,2008,29(8):2097-2101,2110.(in Chinese)
[3]詹永祥,蒋关鲁,胡安华,等.遂渝线无碴轨道桩板结构路基动力响应现场试验研究[J].岩土力学,2009,30(3):832-835.ZHAN Yong-xiang,JI ANG Guan-lu,HU An-hua,et al.Study of dynamic response of pile-plank embankment ofballastless truck based on field test in Suining-Chongqing High-speed Rail way[J].Rock and Soil Mechanics,2009,30(3):832-835.(in Chinese)
[4]詹永祥,蒋关鲁.CFG桩桩-网结构地基抗液化性能数值分析[J].中国铁道科学,2008,29(5):1-6.ZHAN Yong-xiang,JI ANG Guan-lu.Numerical si mulationof the liquefaction resistance characteristics of CFG pilecolumn-net composite foundation[J].China Railway Science,2008,29(5):1-6.(in Chinese)
[5]詹永祥,蒋关鲁,魏永幸.无碴轨道桩板结构路基在地震荷载下的动力响应分析[J].中国铁道科学,2006,27(6):22-26.ZHAN Yong-xiang,JI ANG Guan-lu,WEI Yong-xing.Dynamic response analysis onthe pile-plank structure roadbedof ballastless track under earthquake load[J].China Rail wayScience,2006,27(6):22-26.(in Chinese)
[6]邱延峻,张晓靖,魏永幸.列车速度对无碴轨道路基动力特性的影响[J].交通运输工程学报,2007,7(2):1-5.QIU Yan-jun,ZHANG Xiao-jing,WEI Yong-xing.Influenceof train speed on dynamic characteristics of ballastless tracksubgrade[J].Journal of Traffic and TransportationEngineering,2007,7(2):1-5.(in Chinese)
[7]凌贤长,王臣,王成.液化场地桩-土-桥梁结构动力相互作用振动台试验模型相似设计方法[J].岩石力学与工程学报,2004,23(3):450-456.LI NG Xian-zhang,WANG Chen,WANG Cheng.Scalemodeling method of shakingtable test of dynamic interaction ofpile-soil-bridge structure in ground of soil liquefaction[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(3):450-456.(in Chinese)
[8]DOBRY R,ABDOUN T,O ROURKE T D,et al.Singlepiles in lateral spreads:field bending moment evaluation[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(10):879-889.
[9]WONG S C,POULOS H G.Approxi mate pile-to-pile inter-action factors between two dissi milar piles[J].Computersand Geotechnics,2005,32(8):613-618.
[10]蒋关鲁,刘先锋,张建文,等.高速铁路液化土地基加固的振动台试验研究[J].西南交通大学学报,2006,41(2):190-196.JI ANG Guan-lu,LI U Xian-feng,ZHANG Jian-wen,et al.Shaking table test of composite foundation reinforcement ofsaturated silty soil ground for high speed rail way[J].Journalof Southwest Jiaotong University,2006,41(2):190-196.(in Chinese)
[11]赵怀耘,刘建新,翟婉明.板式轨道动力响应分析方法[J].交通运输工程学报,2007,7(5):19-23.ZHAO Huai-yun,LI UJian-xin,ZHAI Wan-ming.Analysismethod of dynamic responses on slab track[J].Journal ofTraffic and Transportation Engineering,2007,7(5):19-23.(in Chinese)
[2]詹永祥,蒋关鲁,牛国辉,等.桩板结构路基动力模型试验研究[J].岩土力学,2008,29(8):2097-2101,2110.ZHAN Yong-xiang,JI ANG Guan-lu,NI U Guo-hui,et al.Model experi mental research on dynamic performance of pile-plank embankment[J].Rock and Soil Mechanics,2008,29(8):2097-2101,2110.(in Chinese)
[3]詹永祥,蒋关鲁,胡安华,等.遂渝线无碴轨道桩板结构路基动力响应现场试验研究[J].岩土力学,2009,30(3):832-835.ZHAN Yong-xiang,JI ANG Guan-lu,HU An-hua,et al.Study of dynamic response of pile-plank embankment ofballastless truck based on field test in Suining-Chongqing High-speed Rail way[J].Rock and Soil Mechanics,2009,30(3):832-835.(in Chinese)
[4]詹永祥,蒋关鲁.CFG桩桩-网结构地基抗液化性能数值分析[J].中国铁道科学,2008,29(5):1-6.ZHAN Yong-xiang,JI ANG Guan-lu.Numerical si mulationof the liquefaction resistance characteristics of CFG pilecolumn-net composite foundation[J].China Railway Science,2008,29(5):1-6.(in Chinese)
[5]詹永祥,蒋关鲁,魏永幸.无碴轨道桩板结构路基在地震荷载下的动力响应分析[J].中国铁道科学,2006,27(6):22-26.ZHAN Yong-xiang,JI ANG Guan-lu,WEI Yong-xing.Dynamic response analysis onthe pile-plank structure roadbedof ballastless track under earthquake load[J].China Rail wayScience,2006,27(6):22-26.(in Chinese)
[6]邱延峻,张晓靖,魏永幸.列车速度对无碴轨道路基动力特性的影响[J].交通运输工程学报,2007,7(2):1-5.QIU Yan-jun,ZHANG Xiao-jing,WEI Yong-xing.Influenceof train speed on dynamic characteristics of ballastless tracksubgrade[J].Journal of Traffic and TransportationEngineering,2007,7(2):1-5.(in Chinese)
[7]凌贤长,王臣,王成.液化场地桩-土-桥梁结构动力相互作用振动台试验模型相似设计方法[J].岩石力学与工程学报,2004,23(3):450-456.LI NG Xian-zhang,WANG Chen,WANG Cheng.Scalemodeling method of shakingtable test of dynamic interaction ofpile-soil-bridge structure in ground of soil liquefaction[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(3):450-456.(in Chinese)
[8]DOBRY R,ABDOUN T,O ROURKE T D,et al.Singlepiles in lateral spreads:field bending moment evaluation[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(10):879-889.
[9]WONG S C,POULOS H G.Approxi mate pile-to-pile inter-action factors between two dissi milar piles[J].Computersand Geotechnics,2005,32(8):613-618.
[10]蒋关鲁,刘先锋,张建文,等.高速铁路液化土地基加固的振动台试验研究[J].西南交通大学学报,2006,41(2):190-196.JI ANG Guan-lu,LI U Xian-feng,ZHANG Jian-wen,et al.Shaking table test of composite foundation reinforcement ofsaturated silty soil ground for high speed rail way[J].Journalof Southwest Jiaotong University,2006,41(2):190-196.(in Chinese)
[11]赵怀耘,刘建新,翟婉明.板式轨道动力响应分析方法[J].交通运输工程学报,2007,7(5):19-23.ZHAO Huai-yun,LI UJian-xin,ZHAI Wan-ming.Analysismethod of dynamic responses on slab track[J].Journal ofTraffic and Transportation Engineering,2007,7(5):19-23.(in Chinese)
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