双排桩基悬臂式挡墙受力及变形特征研究分析
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摘要
研究目的:悬臂式挡土墙是一种轻型支挡结构,具有外观形式好、地基承载力要求不高等特点,在工程建设中得到广泛应用,但其使用高度、使用条件等方面受限制,为充分发挥其结构的优势,本文提出一种双排桩基悬臂式挡土墙结构,大大拓展了其应用范围,有效揭示双排桩基悬臂式挡土墙的受力及变形特征,对推广应用具有重要意义。研究结论:(1)桩基内力分布规律:内桩弯矩极值位于锚固点处,外桩弯矩极值位于桩顶处,内桩与外桩剪力极值均位于锚固段附近;(2)挡墙底板内力分布规律:底板横向剪力极值位于底板与内桩、外桩、悬臂段连接处附近,横向弯矩极值处于底板横向跨中偏内桩处以及悬臂连接处;底板纵向剪力极值位于底板纵向桩基连接处,纵向弯矩极值位于底板纵向桩基连接处以及跨中处;(3)该组合结构变形特征:在列车荷载及填料荷载的共同作用下,结构最大水平位移发生在悬臂顶部,结构水平位移主要为桩基和悬臂段的挠曲变形,其中桩基挠曲变形占比相对较大;(4)该研究成果可为类似收坡加固工程提供参考。
Research purposes: With fine appearance and low demand to bearing capacity of foundation,the cantilever retaining wall structure was a light retaining structure which was widely used in engineering construction. But its use height and use conditions were limited. In order to exert advantages and enlarge application range of the cantilever retaining wall structure,the double-row pile foundation cantilever retaining wall structure has been proposed,and it was very important to reveal the characteristics of the stress and deformation of double-row pile foundation cantilever retaining wall structure.Research conclusions:(1) The stress of pile: the extreme moment of inside pile was located at anchor point,the extreme moment of outside pile was located at pile top,and both extreme shear forces were located at anchor point.(2) The stress of floor: the extreme shear force of cross section was located near the connection between the floor and the pile and the cantilever section,and the extreme moment of cross section was located at the middle near inside pile and the connection between the floor and the cantilever section; The extreme shear force of longitudinal section waslocated near the connection between the floor and the pile,and the extreme moment of longitudinal section was located at the connection between floor and cantilever section and the middle floor.(3) Deformation features: under the interaction of train and embankment filling,the maximum horizontal displacement of the structure appears on the top of the cantilever,and the horizontal displacement is flexural deformation,and which of the pile is bigger than the cantilever section.(4) The research results can provide reference for the similar engineering practice.
Research purposes: With fine appearance and low demand to bearing capacity of foundation,the cantilever retaining wall structure was a light retaining structure which was widely used in engineering construction. But its use height and use conditions were limited. In order to exert advantages and enlarge application range of the cantilever retaining wall structure,the double-row pile foundation cantilever retaining wall structure has been proposed,and it was very important to reveal the characteristics of the stress and deformation of double-row pile foundation cantilever retaining wall structure.Research conclusions:(1) The stress of pile: the extreme moment of inside pile was located at anchor point,the extreme moment of outside pile was located at pile top,and both extreme shear forces were located at anchor point.(2) The stress of floor: the extreme shear force of cross section was located near the connection between the floor and the pile and the cantilever section,and the extreme moment of cross section was located at the middle near inside pile and the connection between the floor and the cantilever section; The extreme shear force of longitudinal section waslocated near the connection between the floor and the pile,and the extreme moment of longitudinal section was located at the connection between floor and cantilever section and the middle floor.(3) Deformation features: under the interaction of train and embankment filling,the maximum horizontal displacement of the structure appears on the top of the cantilever,and the horizontal displacement is flexural deformation,and which of the pile is bigger than the cantilever section.(4) The research results can provide reference for the similar engineering practice.
引文
[1]TB 10025—2006,铁路路基支挡结构设计规范[S].TB 10025—2006,Code for Design on Retaining Structures of Railway Subgrade[S].
[2]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2011.Li Haiguang.Design and Engineering Example of New Type of Retaining Structure[M].Beijing:China Communications Press,2011.
[3]姚裕春,李安洪,苏谦.陡坡椅式桩板结构受力模式及计算方法分析[J].铁道工程学报,2016(8):71-76.Yao Yuchun,Li Anhong,Su Qian.Analysis of Force Model and Calculation Method of Chair-shaped Sheetpile Structure Constructed on Steep Slop[J].Journal of Railway Engineering Society,2016(8):71-76.
[4]姚裕春,魏永幸,袁碧玉.高速铁路斜坡路堤变形控制探讨[J].铁道工程学报,2014(5):16-21.Yao Yuchun,Wei Yongxing,Yuan Biyu.Exploration of the Deformation and Control of Embankment Constructed on Slope Foundation for High-speed Railways[J].Journal of Railway Engineering Society,2014(5):16-21.
[5]周珩.桩基悬臂式新型支挡结构受力机理与设计计算[D].成都:西南交通大学,2013.Zhou Heng.Study on Mechanical Behavior and Design Optimization of New Piles Foundation Cantilever Retaining Structure on the Slope[D].Chengdu:Southwest Jiaotong University,2013.
[6]姚裕春,袁碧玉.铁路高填方下沉式站房收坡结构选择创新方法分析[J].高速铁路技术,2018(1):16-20.Yao Yuchun,Yuan Biyu.Selection of Innovative Methods for Reinforcing Structure for Highfill Sunken Railway Station[J].High Speed Railway Technology,2018(1):16-20.
[7]姚裕春,李安洪,袁碧玉,等.桩基悬臂式、扶臂式挡土墙:中国,201220442371.1[P].Yao Yuchun,Li Anhong,Yuan Biyu,etc.Pile Foundation Cantilever Retaining Wall and Counterfort Retaining Wall:China,201220442371.1[P].
[8]姚裕春,袁碧玉.无砟轨道铁路陡坡路基加固结构创新方法分析[J].高速铁路技术,2015(4):31-35.Yao Yuchun,Yuan Biyu.Analysis on Innovative Methods for Reinforcing Structure of Steep Slope Subgrade of Ballastless Track Railway[J].High Speed Railway Technology,2015(4):31-35.
[2]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2011.Li Haiguang.Design and Engineering Example of New Type of Retaining Structure[M].Beijing:China Communications Press,2011.
[3]姚裕春,李安洪,苏谦.陡坡椅式桩板结构受力模式及计算方法分析[J].铁道工程学报,2016(8):71-76.Yao Yuchun,Li Anhong,Su Qian.Analysis of Force Model and Calculation Method of Chair-shaped Sheetpile Structure Constructed on Steep Slop[J].Journal of Railway Engineering Society,2016(8):71-76.
[4]姚裕春,魏永幸,袁碧玉.高速铁路斜坡路堤变形控制探讨[J].铁道工程学报,2014(5):16-21.Yao Yuchun,Wei Yongxing,Yuan Biyu.Exploration of the Deformation and Control of Embankment Constructed on Slope Foundation for High-speed Railways[J].Journal of Railway Engineering Society,2014(5):16-21.
[5]周珩.桩基悬臂式新型支挡结构受力机理与设计计算[D].成都:西南交通大学,2013.Zhou Heng.Study on Mechanical Behavior and Design Optimization of New Piles Foundation Cantilever Retaining Structure on the Slope[D].Chengdu:Southwest Jiaotong University,2013.
[6]姚裕春,袁碧玉.铁路高填方下沉式站房收坡结构选择创新方法分析[J].高速铁路技术,2018(1):16-20.Yao Yuchun,Yuan Biyu.Selection of Innovative Methods for Reinforcing Structure for Highfill Sunken Railway Station[J].High Speed Railway Technology,2018(1):16-20.
[7]姚裕春,李安洪,袁碧玉,等.桩基悬臂式、扶臂式挡土墙:中国,201220442371.1[P].Yao Yuchun,Li Anhong,Yuan Biyu,etc.Pile Foundation Cantilever Retaining Wall and Counterfort Retaining Wall:China,201220442371.1[P].
[8]姚裕春,袁碧玉.无砟轨道铁路陡坡路基加固结构创新方法分析[J].高速铁路技术,2015(4):31-35.Yao Yuchun,Yuan Biyu.Analysis on Innovative Methods for Reinforcing Structure of Steep Slope Subgrade of Ballastless Track Railway[J].High Speed Railway Technology,2015(4):31-35.