桩径对陡岩河岸墩式码头群桩基础竖向承载特性的影响
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摘要
采用ABAQUS有限元软件模拟陡岩群桩(四边形四桩)竖向承载工况,建模过程考虑陡坡钻岩成孔、桩基和承台混凝土浇筑、群桩承载等流程,并考虑材料和桩岩接触非线性影响,建立陡岩群桩系统三维模型,通过改变桩径、桩嵌岩深度等参数,分析陡岩群桩(四边形四桩)的竖向承载特性。研究表明,不同桩径和桩嵌岩深度条件下陡岩群桩(四边形四桩)竖向承载能力是群桩径向膨胀与桩前岩体缺失效应、桩后岩体增强效应、承台刚度综合作用的体现。群桩竖向极限承载力和竖向承载群桩效应系数随桩径的增大分别呈"S"形和"∽"形规律变化。对于竖向荷载作用下的陡岩群桩(四边形四桩),在桩径较大时(D=2.2m),前排桩(桩1和桩2)的桩顶沉降与后排桩(桩3和桩4)的桩顶沉降仍有较明显的差异。
In this paper,the finite element software ABAQUS was used to simulate the vertical bearing condition of steep rock group piles(quadrilateral four piles).The modelled process incluled drilling hole in rock slope,pouring concrete of pile and platform,loading process of group piles foundation etc.The nonlinear effects of material and pile-rock contact were taken into consideration when three-dimensional models of steep rock group piles system were developed.The vertical bearing characteristics of steep rock group piles were analyzed by changing parameter of pile diameter and rock-socketed depth of pile etc.The research results showed that the vertical bearing capacity of steep rock group piles(quadrilateral four piles)under the condition of different pile diameter and rock-socketed depth was the embodiment of comprehensive effect of radial expansion of group piles and loss effect of the rock mass before pile,reinforcement effect of the rock mass behind pile and stiffness of the bearing platform.The vertical ultimate bearing capacity and coefficient of group piles effect varied with the increase of pile diameter in the"S"type and"∽"type.For steep rock group piles(quadrilateral four piles)under vertical load,the settlement of pile top settlement of the front row pile(Pile 1 and Pile 2)still had obvious difference with the pile top settlement of the back row pile(Pile 3 and Pile 4)even when pile diameter was large(D=2.2 m).
In this paper,the finite element software ABAQUS was used to simulate the vertical bearing condition of steep rock group piles(quadrilateral four piles).The modelled process incluled drilling hole in rock slope,pouring concrete of pile and platform,loading process of group piles foundation etc.The nonlinear effects of material and pile-rock contact were taken into consideration when three-dimensional models of steep rock group piles system were developed.The vertical bearing characteristics of steep rock group piles were analyzed by changing parameter of pile diameter and rock-socketed depth of pile etc.The research results showed that the vertical bearing capacity of steep rock group piles(quadrilateral four piles)under the condition of different pile diameter and rock-socketed depth was the embodiment of comprehensive effect of radial expansion of group piles and loss effect of the rock mass before pile,reinforcement effect of the rock mass behind pile and stiffness of the bearing platform.The vertical ultimate bearing capacity and coefficient of group piles effect varied with the increase of pile diameter in the"S"type and"∽"type.For steep rock group piles(quadrilateral four piles)under vertical load,the settlement of pile top settlement of the front row pile(Pile 1 and Pile 2)still had obvious difference with the pile top settlement of the back row pile(Pile 3 and Pile 4)even when pile diameter was large(D=2.2 m).
引文
[1]周世良,吴飞桥,王全,等.三峡库区架空墩式散货码头结构模态分析[J].港工技术,2010,47(3):25-27.ZHOU Shiliang,WU Feiqiao,WANG Quan,et al.Modal analysis on over-head pier bulk wharf in the Three Gorges reservoir district[J].Port Engineering Technology,2010,47(3):25-27.(in Chinese)
[2]周世良,古西召,陈晓攀,等.三峡库区架空直立墩式码头靠泊能力评估研究[J].港工技术,2010,47(5):22-26.ZHOU Shiliang,GU Xizhao,CHEN Xiaopan,et al.Study and assessment on bearing capacity of elevated wharf with vertical abutment in Three Gorges reservoir area[J].Port Engineering Technology,2010,47(5):22-26.(in Chinese)
[3]龙丽吉.河港框架墩式码头动力仿真及可靠度分析[D].重庆:重庆交通大学,2010.LONG Liji.Research on the dynamic simulation and reliability for the frame-pier in river[D].Chongqing:Chongqing Jiaotong University,2010.(in Chinese)
[4]龙丽吉,左旋峰,何光春.大水位差框架墩式码头动力仿真分析[J].水运工程,2012(9):74-79.LONG Liji,ZUO Xuanfeng,HE Guangchun.Dynamic simulation for frame-pier in river with large fluctuation[J].Port&Waterway Engineering,2012(9):74-79.(in Chinese)
[5]刘明维,杨浩,江德飞,等.框架墩式码头结构受力性能有限元分析[J].水运工程,2010(9):51-56.LIU Mingwei,YANG Hao,JIANG Defei,et al.Finite element analysis of mechanical behavior of framework pier wharf structure[J].Port&Waterway Engineering,2010(9):51-56.(in Chinese)
[6]邓友生,赵明华,郑建强,等.陡坡双桩柱式桥墩沉降分析[J].武汉理工大学学报,2012,34(6):105-108.DENG Yousheng,ZHAO Minghua,ZHENG Jianqiang et al.Study on settlements of double pile-column bridge pier at steep slope[J].Journal of Wuhan University of Technology,2012,34(6):105-108.(in Chinese)
[7]尹平保.陡坡段桩柱式桥梁桩基设计计算方法及试验研究[D].长沙:湖南大学,2013.YIN Pingbao.Design method and test study of pile-column bridge foundation in steep slope[D].Changsha:Hunan University,2013.(in Chinese)
[8]王园园.高陡斜坡变形区桥梁高承台群桩基础加固结构研究[D].成都:西南交通大学,2017.WANG Yuanyuan.Study on the reinforcement structure of bridge high cap foundation in high and steep deformation area[D].Chengdu:Southwest Jiaotong University,2017.(in Chinese)
[9]陈志坚,冯兆祥,陈松,等.江阴大桥摩擦失效嵌岩群桩传力机理的实测研究[J].岩石力学与工程学报,2002,21(6):883-887.CHEN Zhijian,FENG Zhaoxiang,CHEN Song,et al.Testing study on load-transfer mechanism of frictionlost embed pile in Jiangyin Bridge[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(6):883-887.(in Chinese)
[10]王永艺,周世良.桩距对陡岩河岸墩式码头群桩基础竖向承载特性影响研究[J].河南科学,2018,36(9):1401-1408.WANG Yongyi,ZHOU Shiliang.Influence of pile distance on vertical bearing characteristics of group piles foundation with pier type wharf in steep rock bank of river[J].Henan Sciences,2018,36(9):1401-1408.(in Chinese)
[11]王永艺,周世良,廖冬.山区河流港口工程斜坡嵌岩桩竖向承载能力分析[J].水运工程,2018(3):166-172.WANG Yongyi,ZHOU Shiliang,LIAO Dong.Analysis of vertical bearing capacity of slope rock-socketed pile in port engineering in mountainous river[J].Port&Waterway Engineering,2018(3):166-172.(in Chinese)
[2]周世良,古西召,陈晓攀,等.三峡库区架空直立墩式码头靠泊能力评估研究[J].港工技术,2010,47(5):22-26.ZHOU Shiliang,GU Xizhao,CHEN Xiaopan,et al.Study and assessment on bearing capacity of elevated wharf with vertical abutment in Three Gorges reservoir area[J].Port Engineering Technology,2010,47(5):22-26.(in Chinese)
[3]龙丽吉.河港框架墩式码头动力仿真及可靠度分析[D].重庆:重庆交通大学,2010.LONG Liji.Research on the dynamic simulation and reliability for the frame-pier in river[D].Chongqing:Chongqing Jiaotong University,2010.(in Chinese)
[4]龙丽吉,左旋峰,何光春.大水位差框架墩式码头动力仿真分析[J].水运工程,2012(9):74-79.LONG Liji,ZUO Xuanfeng,HE Guangchun.Dynamic simulation for frame-pier in river with large fluctuation[J].Port&Waterway Engineering,2012(9):74-79.(in Chinese)
[5]刘明维,杨浩,江德飞,等.框架墩式码头结构受力性能有限元分析[J].水运工程,2010(9):51-56.LIU Mingwei,YANG Hao,JIANG Defei,et al.Finite element analysis of mechanical behavior of framework pier wharf structure[J].Port&Waterway Engineering,2010(9):51-56.(in Chinese)
[6]邓友生,赵明华,郑建强,等.陡坡双桩柱式桥墩沉降分析[J].武汉理工大学学报,2012,34(6):105-108.DENG Yousheng,ZHAO Minghua,ZHENG Jianqiang et al.Study on settlements of double pile-column bridge pier at steep slope[J].Journal of Wuhan University of Technology,2012,34(6):105-108.(in Chinese)
[7]尹平保.陡坡段桩柱式桥梁桩基设计计算方法及试验研究[D].长沙:湖南大学,2013.YIN Pingbao.Design method and test study of pile-column bridge foundation in steep slope[D].Changsha:Hunan University,2013.(in Chinese)
[8]王园园.高陡斜坡变形区桥梁高承台群桩基础加固结构研究[D].成都:西南交通大学,2017.WANG Yuanyuan.Study on the reinforcement structure of bridge high cap foundation in high and steep deformation area[D].Chengdu:Southwest Jiaotong University,2017.(in Chinese)
[9]陈志坚,冯兆祥,陈松,等.江阴大桥摩擦失效嵌岩群桩传力机理的实测研究[J].岩石力学与工程学报,2002,21(6):883-887.CHEN Zhijian,FENG Zhaoxiang,CHEN Song,et al.Testing study on load-transfer mechanism of frictionlost embed pile in Jiangyin Bridge[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(6):883-887.(in Chinese)
[10]王永艺,周世良.桩距对陡岩河岸墩式码头群桩基础竖向承载特性影响研究[J].河南科学,2018,36(9):1401-1408.WANG Yongyi,ZHOU Shiliang.Influence of pile distance on vertical bearing characteristics of group piles foundation with pier type wharf in steep rock bank of river[J].Henan Sciences,2018,36(9):1401-1408.(in Chinese)
[11]王永艺,周世良,廖冬.山区河流港口工程斜坡嵌岩桩竖向承载能力分析[J].水运工程,2018(3):166-172.WANG Yongyi,ZHOU Shiliang,LIAO Dong.Analysis of vertical bearing capacity of slope rock-socketed pile in port engineering in mountainous river[J].Port&Waterway Engineering,2018(3):166-172.(in Chinese)