高铁荷载下桩-土复合地基振动响应特性研究
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摘要
采用一种复合正弦波(M波)模拟列车移动荷载,建立轨道-路堤-PCC桩-土复合地基三维动力有限元模型,研究高速铁路路堤及PCC桩复合地基在列车荷载作用下的振动响应特性。研究结果表明:在靠近列车荷载作用处振动响应比较强,随着与轨道的距离增加,振动响应值也逐步降低,至地基远处24.5 m处,振动响应已经很小。路堤内振动波远低于枕木处振动幅值,振动波经路堤、垫层、桩体和土体层层过滤衰减作用,在地基下部土体中振动被削弱,振动的幅值和频率范围均受到影响。经过滤后地基下部土体振动响应频率接近或者低于土体自振频率,路堤、桩体和地基振动响应曲线体现了振动波在路堤系统各部分传播特点,反映出各部分振动特性。
In this paper, a composite wave vibration wave(M wave) was used to simulate the moving train load, and a three-dimensional dynamic finite element model of tracks embankment pile-soil composite foundation was established. The dynamic character of embankment and composite foundation was then simulated. The results show that, the vibration response is much stronger near the vibration source. The vibration value decreases with the distance from the vibration source, and it reaches a lower level at the position 24.5 m away from the railway. The vibration amplitude in subgrade is much lower than that in sleeper. The vibration waves are weakened by the energy attenuation when they go through the subgrade, cushion, pile and soils. The vibration amplitude and frequency ranges are influenced as well. The vibration waves filtered by superstructure include low frequencies, which are equal to or lower than the natural vibration frequency of soils. Thus, the vibration response curves of subgrade, pile, foundation reflect the spread law of vibration waves and their vibration character.
In this paper, a composite wave vibration wave(M wave) was used to simulate the moving train load, and a three-dimensional dynamic finite element model of tracks embankment pile-soil composite foundation was established. The dynamic character of embankment and composite foundation was then simulated. The results show that, the vibration response is much stronger near the vibration source. The vibration value decreases with the distance from the vibration source, and it reaches a lower level at the position 24.5 m away from the railway. The vibration amplitude in subgrade is much lower than that in sleeper. The vibration waves are weakened by the energy attenuation when they go through the subgrade, cushion, pile and soils. The vibration amplitude and frequency ranges are influenced as well. The vibration waves filtered by superstructure include low frequencies, which are equal to or lower than the natural vibration frequency of soils. Thus, the vibration response curves of subgrade, pile, foundation reflect the spread law of vibration waves and their vibration character.
引文
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[13]孙广超,刘汉龙,孔纲强,等.振动波型对形桩桩–筏复合地基动力响应影响的模型试验研究[J].岩土工程学报,2016,38(6):1021-1029.SUN Guangchao,LIU Hanlong,KONG Gangqiang,et al.Model tests on effect of vibration waves on dynamic response of XCC pile-raft composite foundation[J].Chinese Journal of Geotechnical Engineering,2016,38(6):1021-1029.
[14]李善珍,马学宁,时瑞国.高速铁路桩帽网和桩筏复合地基模型试验研究[J].铁道科学与工程学报,2016,13(4):600-605.LI Shanzhen,MA Xuening,SHI Ruiguo.Experimental study on CFG pile-(cap-)-net and pile-raft composite foundations of high speed railway[J].Journal of Railway Science and Engineering,2016,13(4):600-605.
[15]Li S,Lai Y,Zhang S,et al.Dynamic responses of Qinghai-Tibet railway embankment subjected to train loading in different seasons[J].Soil Dynamics&Earthquake Engineering,2012,32(1):1-14.
[16]丁选明,刘汉龙,陈育民.《现浇混凝土大直径管桩复合地基技术规程》的编制与说明[J].施工技术,2011,40(2):91-94.DING Xuanming,LIU hanlong,CHEN Yumin.Compilation and explanation of technical specification for composite foundation of cast-in-place concrete large-diameter pipe pile JGJT213-2010[J].Construction Technology,2011,40(2):91-94.
[17]徐进.高速铁路路基模型试验系统研究与动力分析[D].长沙:中南大学,2012.XU Jin.Research on model test system of high speed railway subgrade and dynamics analysis[D].Changsha:Central South University,2012.
[2]黄博,丁浩,陈云敏.高速列车荷载作用的动三轴试验模拟[J].岩土工程学报,2011,33(2):195-202.HUANG Bo,DING Hao,CHEN Yunmin.Simulation of high-speed train load by dynamic triaxial tests[J].Chinese Journal of Geotechnical Engineering,2011,33(2):195-202.
[3]付强,刘汉龙,庄妍,等.高速铁路桩筏复合地基沉降变形特性研究[J].铁道科学与工程学报,2014,11(6):45-51.FU Qiang,LIU Hanlong,ZHUANG Yan,et al.Analysis of settlement characteristic of CFG piled raft composite foundation in high-speed railway[J].Journal of Railway Science and Engineering,2014,11(6):45-51.
[4]詹永祥,蒋关鲁.无碴轨道路基基床动力特性的研究[J].岩土力学,2010,31(2):392-396.ZHAN Yongxiang,JIANG Guanlu.Study of dynamic characteristics of soil subgrade bed for ballastless track[J].Rock and Soil Mechanics,2010,31(2):392-396.
[5]张崇磊,蒋关鲁,袁胜洋,等.循环荷载下桩网结构路基和垫层动力响应研究[J].岩土力学,2014,35(6):1664-1670.ZHANG Chonglei,JIANG Guanlu,YUAN Shengyang,et al.Dynamic response analysis of column-net structure subgrade and reinforced cushion under cyclic loading[J].Rock and Soil Mechanics,2014,35(6):1664-1670.
[6]高广运,李志毅,冯世进,等.秦沈铁路列车运行引起的地面振动实测与分析[J].岩土力学,2007,28(9):1817-1822.GAO Guangyun,LI Zhiyi,FENG Shijin,et al.Experimental results and numerical predictions of ground vibration induced by high-speed train running on Qing huang dao-Shengyang railway[J].Rock and Soil Mechanics,2007,28(9):1817-1822.
[7]李西斌,吴金耀.高速列车荷载下桩承加筋路堤位移机制数值分析[J].岩土工程学报,2011,33(2):232-237.LI Xibin,WU Jinyao.Deformation mechanism of geosynthetic reinforced pile supported embankment under high-speed train loads[J].Chinese Journal of Geotechnical Engineering,2011,33(2):232-237.
[8]孟飞,唐堂,刘蓓.不同类型无砟轨道路基动力响应研究[J].铁道科学与工程学报,2011,8(4):19-23.MENG Fei,TANG Tang,LIU Bei.Dynamic response of different ballastless track subgrade[J].Journal of Railway Science and Engineering,2011,8(4):19-23.
[9]Thach Pham Ngoc,LIU Hanlong,KONG Gangqiang.Evaluation of PCC pile method in mitigating embankment vibrations from high-speed train[J].Journal of Geotechnical and Geo-environmental Engineering,2013,139(12):2225-2228.
[10]El Kacimi A,Woodward P K,Laghrouche O,et al.Time domain 3D finite element modelling of train-induced vibration at high speed[J].Computers&Structures,2013,118(6):66-73.
[11]Thach Pham Ngoc,LIU Hanlong,KONG Gangqiang.Vibration analysis of pile-supported embankments under high-speed train passage[J].Soil Dynamics and Earthquake Engineering,2013,55:92-99.
[12]徐翔.高速铁路路基动力响应的现场测试及物理模型试验研究[D].杭州:浙江大学,2014.XU Xiang.Study on field measurement and full-scale model test on dynamic response of high-speed railway subgrade[D].Hangzhou:Zhejiang University,2014.
[13]孙广超,刘汉龙,孔纲强,等.振动波型对形桩桩–筏复合地基动力响应影响的模型试验研究[J].岩土工程学报,2016,38(6):1021-1029.SUN Guangchao,LIU Hanlong,KONG Gangqiang,et al.Model tests on effect of vibration waves on dynamic response of XCC pile-raft composite foundation[J].Chinese Journal of Geotechnical Engineering,2016,38(6):1021-1029.
[14]李善珍,马学宁,时瑞国.高速铁路桩帽网和桩筏复合地基模型试验研究[J].铁道科学与工程学报,2016,13(4):600-605.LI Shanzhen,MA Xuening,SHI Ruiguo.Experimental study on CFG pile-(cap-)-net and pile-raft composite foundations of high speed railway[J].Journal of Railway Science and Engineering,2016,13(4):600-605.
[15]Li S,Lai Y,Zhang S,et al.Dynamic responses of Qinghai-Tibet railway embankment subjected to train loading in different seasons[J].Soil Dynamics&Earthquake Engineering,2012,32(1):1-14.
[16]丁选明,刘汉龙,陈育民.《现浇混凝土大直径管桩复合地基技术规程》的编制与说明[J].施工技术,2011,40(2):91-94.DING Xuanming,LIU hanlong,CHEN Yumin.Compilation and explanation of technical specification for composite foundation of cast-in-place concrete large-diameter pipe pile JGJT213-2010[J].Construction Technology,2011,40(2):91-94.
[17]徐进.高速铁路路基模型试验系统研究与动力分析[D].长沙:中南大学,2012.XU Jin.Research on model test system of high speed railway subgrade and dynamics analysis[D].Changsha:Central South University,2012.