斜坡软土路基上桩板结构地震响应分析
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摘要
桩板结构是一种新型的铁路地基基础处理工法。根据相关规定,桩板结构在设计时应考虑地震荷载作用。但目前国内外针对桩板结构的地震响应研究非常有限。建立桩、板、土体三维数学分析模型,加载"5.12"汶川地震波,对斜坡桩板结构路基在地震荷载下的各动态响应进行系统分析,探讨承载板厚、桩板连接方式、桩间距等不同设计参数在地震作用下对桩板结构响应的影响规律。研究结果表明:1在地震荷载作用下,斜坡桩板结构路基动力响应最大的部件是桩,位置为斜坡软土地基与路堤的交界面处;同时分析表明,桩的动态变形为水平摇摆变形,其中桩顶位置位移最大;2桩与承载板采用固结方式连接,在地震力作用下会产生应力集中现象,是结构的薄弱环节,抗震设计时应给予关注;3承载板厚度、桩间距等设计参数对桩板结构的地震响应有明显影响,建议进行桩板结构设计时充分考虑地震力的影响而合理设计;4分析不同烈度区PGA放大系数表明,在9级及以上地区采用桩板结构应进行特殊设计。
The pile-slab structure is a new kind of ground treatment of railway engineering, and the design should consider the seismic load according to the code. But at present the research on the seismic response of pile-slab structure is very limited. In this paper, 3D solid model of pile, slab and soil is established. By adopting the earthquake wave in "5.12" Wen Chuan earthquake, dynamic response of the pile-slab structure embankment with slope ground under seismic load was analyzed. The impact of design parameters such as bearing slab thickness, pile-slab connecting mode, pile spacing are also analyzed. The results show that:(1) Under the action of seismic waves, dynamic response of the slab is the largest of the slope pile-slab structure embankment and located at the interface of soft soil slope foundation and embankment. The pile deformation is horizontal swing deformation and the maximum displacement in the top of the pile.(2) The place where pile and the bearing slab connect occurs stress concentration, which is the weak point. So we should pay attention to the seismic design for that.(3) The design parameters of bearing slab thickness and pile spacing had significant influence on the seismic response of pile-slab structure. It is suggested to fully consider the influence of seismic force in order to achieve reasonable pile-slab structure design.(4) Analysis of different intensity areas PGA amplification coefficient shows that the pile slab structure should be designed specially used in Grade 9 and above zone.
The pile-slab structure is a new kind of ground treatment of railway engineering, and the design should consider the seismic load according to the code. But at present the research on the seismic response of pile-slab structure is very limited. In this paper, 3D solid model of pile, slab and soil is established. By adopting the earthquake wave in "5.12" Wen Chuan earthquake, dynamic response of the pile-slab structure embankment with slope ground under seismic load was analyzed. The impact of design parameters such as bearing slab thickness, pile-slab connecting mode, pile spacing are also analyzed. The results show that:(1) Under the action of seismic waves, dynamic response of the slab is the largest of the slope pile-slab structure embankment and located at the interface of soft soil slope foundation and embankment. The pile deformation is horizontal swing deformation and the maximum displacement in the top of the pile.(2) The place where pile and the bearing slab connect occurs stress concentration, which is the weak point. So we should pay attention to the seismic design for that.(3) The design parameters of bearing slab thickness and pile spacing had significant influence on the seismic response of pile-slab structure. It is suggested to fully consider the influence of seismic force in order to achieve reasonable pile-slab structure design.(4) Analysis of different intensity areas PGA amplification coefficient shows that the pile slab structure should be designed specially used in Grade 9 and above zone.
引文
[1]肖宏,郭丽娜.桩板结构技术应用研究[J].铁道标准设计,2010,(2):47-50(Xiao Hong,Guo Lina.Exploration for application of pile-slab structure technology[J].Railway Standard Design,2010,(2):47-50(in Chinese))
[2]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 Yongxiang,Jiang Guanlu,Wei Yongxing.Dynamic response analysis on the pile-plank structure roadbed of ballastless track under earthquake load[J].China Railway Science,2006,27(6):22-26(in Chinese))
[3]詹永祥,蒋关鲁,牛国辉,等.武广线高边坡陡坡地段桩板结构路基的设计理论探讨[J].铁道工程学报,2007,(S):94-96(Zhan Yongxiang,Jiang Guanlu,Niu Guohui,et al.Theoretical exploration on design of pile-plate structure subgrade in steep slope section of high side slope on Wuchang-Guangzhou Railway passenger dedicated line[J].Journal of Railway Engineering Society,2007,(S):94-96(in Chinese))
[4]Xiao H.Research on analytic calculation method for pile—slab structure design[C]//The 1st International Conference on Railway Engineering,2010:511-516
[5]Lubliner J,Oliver J,Oller S,et al.A plastic-damage model for concrete[J].International Journal of solids and structures,1989,25(3):299-326
[6]Lee J,Fenves G L.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(8):892-900
[7]罗赛虎,田斌.基于ABAQUS的重力坝时程动力分析[J].云南水力发电,2011,27(1):53-57(Luo Saihu,Tian Bin.The ABAQUS-based dynamic analysis of gravity dam time-histories[J].Yunnan Water Power,2011,27(1):53-57(in Chinese))
[8]陈强,刘强,张建经.基于ABAQUS的桩板墙地震响应分析[J].铁道建筑,2011,(6):101-104(Chen Qiang,Liu Qiang,Zhang Jianjing.Seismic response analysis of antislide sheet pile wall using ABAQUS software[J].Railway Engineering,2011,(6):101-104(in Chinese))
[9]GB 50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010(GB 50011—2010 Code for seismic design of buildings[S].Beijing:China Architecture and Building Press,2010(in Chinese))
[2]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 Yongxiang,Jiang Guanlu,Wei Yongxing.Dynamic response analysis on the pile-plank structure roadbed of ballastless track under earthquake load[J].China Railway Science,2006,27(6):22-26(in Chinese))
[3]詹永祥,蒋关鲁,牛国辉,等.武广线高边坡陡坡地段桩板结构路基的设计理论探讨[J].铁道工程学报,2007,(S):94-96(Zhan Yongxiang,Jiang Guanlu,Niu Guohui,et al.Theoretical exploration on design of pile-plate structure subgrade in steep slope section of high side slope on Wuchang-Guangzhou Railway passenger dedicated line[J].Journal of Railway Engineering Society,2007,(S):94-96(in Chinese))
[4]Xiao H.Research on analytic calculation method for pile—slab structure design[C]//The 1st International Conference on Railway Engineering,2010:511-516
[5]Lubliner J,Oliver J,Oller S,et al.A plastic-damage model for concrete[J].International Journal of solids and structures,1989,25(3):299-326
[6]Lee J,Fenves G L.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(8):892-900
[7]罗赛虎,田斌.基于ABAQUS的重力坝时程动力分析[J].云南水力发电,2011,27(1):53-57(Luo Saihu,Tian Bin.The ABAQUS-based dynamic analysis of gravity dam time-histories[J].Yunnan Water Power,2011,27(1):53-57(in Chinese))
[8]陈强,刘强,张建经.基于ABAQUS的桩板墙地震响应分析[J].铁道建筑,2011,(6):101-104(Chen Qiang,Liu Qiang,Zhang Jianjing.Seismic response analysis of antislide sheet pile wall using ABAQUS software[J].Railway Engineering,2011,(6):101-104(in Chinese))
[9]GB 50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010(GB 50011—2010 Code for seismic design of buildings[S].Beijing:China Architecture and Building Press,2010(in Chinese))
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