非埋式桩板结构路基承载机制
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摘要
为了研究深厚湿陷性黄土地基非埋式桩板结构路基的承载机制,选取试验段典型断面进行元器件布置与长期观测;考虑桩土相互作用,依据等刚度的原则引入综合转动刚度的概念,建立了纵、横向平面分析模型,对非埋式桩板结构的受力与变形特性进行测试分析。实测结果表明:结构主筋应力测试值与理论值相差10%～30%,吻合较好,最大值出现在托梁支座断面上侧,为60.60MPa;桩侧土体承受约95%的荷载,且未产生负摩阻力;桩板结构的荷载传递规律与传统路基不同,桩基将荷载传递到更深的持力层,改善了路基软弱土体部分的受力状态;轨道结构完工半年后,承台板顶面最大累计沉降出现在中跨跨中断面,为1.0mm,满足沉降控制要求。
Sensor components were disposed at the typical section of test subgrade,and the bearing capacity mechanism of non-embedded pile-plank structure in deep collapsible loess foundations was studied by long-term observation.The pile-soil interaction was considered,the concept of comprehensive rotation stiffness was introduced based on the principle of equal stiffness,the vertical and horizontal plane models of the subgrade were installed,and the deformation and mechanical characteristic of the structure were analyzed.Measured result shows that the test value of structural main reinforcement stress agree well with the theoretical calculation value,the difference is about 10%-30%,and the maximum reinforcement stress of 60.60 MPa appears at the cross section of joist.Pile side earth bears about 95% of total load,and no negative friction is produced.The load transfer law of the structure is different from that of traditional subgrade,load can be transferred to deeper bearing layer by pile foundation,which improves the stress state of soft soil section.Half a year,after the laying completion of track construction,the largest accumulated settlement of top surface for bearing plank occurs at the cross section of mid-span,which is 1.0 mm,and meets the requirement of settlement control.
Sensor components were disposed at the typical section of test subgrade,and the bearing capacity mechanism of non-embedded pile-plank structure in deep collapsible loess foundations was studied by long-term observation.The pile-soil interaction was considered,the concept of comprehensive rotation stiffness was introduced based on the principle of equal stiffness,the vertical and horizontal plane models of the subgrade were installed,and the deformation and mechanical characteristic of the structure were analyzed.Measured result shows that the test value of structural main reinforcement stress agree well with the theoretical calculation value,the difference is about 10%-30%,and the maximum reinforcement stress of 60.60 MPa appears at the cross section of joist.Pile side earth bears about 95% of total load,and no negative friction is produced.The load transfer law of the structure is different from that of traditional subgrade,load can be transferred to deeper bearing layer by pile foundation,which improves the stress state of soft soil section.Half a year,after the laying completion of track construction,the largest accumulated settlement of top surface for bearing plank occurs at the cross section of mid-span,which is 1.0 mm,and meets the requirement of settlement control.
引文
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[13]罗照新,丁兆锋.客运专线桩板结构设计方法的探讨[J].铁道工程学报,2008(8):33-36.LUO Zhao-xin,DING Zhao-feng.Discussion on the design method of pile-slab structure for passenger dedicated railway[J].Journal of Railway Engineering Society,2008(8):33-36.(in Chinese)
[14]杨正国,罗照新.顶置分幅式路基桩板结构的应用与技术经济分析[J].高速铁路技术,2010,1(4):8-10,25.YANG Zheng-guo,LUO Zhao-xin.Application and tech-nical-economic analysis of top divided pile-board structure embankment[J].High Speed Railway Technology,2010,1(4):8-10,25.(in Chinese)
[15]姚洪锡.武广客运专线软土地基桩板结构设计与应用研究[D].成都:西南交通大学,2009.YAO Hong-xi.Study on the design and application of pile-board structure to soft soil ground for Wuhan-Guangzhou Passenger Dedicated Line[D].Chengdu:Southwest Jiaotong University,2009.(in Chinese)
[2]王小军,屈耀辉,魏永梁,等.郑西客运专线湿陷性黄土区试验路堤的沉降观测与预测研究[J].岩土力学,2010,31(增1):220-231.WANG Xiao-jun,QU Yao-hui,WEI Yong-liang,et al.Set-tlement observation and prediction research of test embank-ment in collapsible loess area along Zhengzhou-Xi’an Passen-ger Dedicated Line[J].Rock and Soil Mechanics,2010,31(S1):220-231.(in Chinese)
[3]SU Qian,BAI Hao,WANG Xun,et al.In-situ test on fatigue characteristics of top-mounted dividable pile-board subgrade for high-speed railway[J].Journal of Southwest Jiaotong University:English Edition,2010,18(1):8-12.
[4]苏谦,李安洪,丁兆锋,等.郑西客运专线深厚湿陷性黄土地基桩板结构设计分析[J].铁道建筑技术,2007(2):1-4.SU Qian,LI An-hong,DING Zhao-feng,et al.Design and analysis on pile-board structure of deep collapsible loess ground along Zhengzhou-Xi’an Passenger Dedicated Line[J].Railway Construction Technology,2007(2):1-4.(in Chinese)
[5]SU Qian,LI Xing,BAI Hao.Dynamic response of pile-board subgrade based on large scale model test[J].Applied Mechanics and Materials,2011,71-78:383-387.
[6]魏永幸.客运专线无砟轨道桩-板结构路基[J].铁道工程学报,2008(4):19-22.WEI Yong-xing.Study on pile-slab structure subgrade for ballastless track of passenger dedicated line[J].Journal of Railway Engineering Society,2008(4):19-22.(in Chinese)
[7]詹永祥,蒋关鲁.桩板结构路基桩-土工作特性[J].交通运输工程学报,2009,9(4):38-42.ZHAN Yong-xiang,JIANG Guan-lu.Pile-soil interacton properties of pile-plank embankment[J].Journal of Traffic and Transportation Engineering,2009,9(4):38-42.(in Chinese)
[8]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,JIANG Guan-lu,HU An-hua,et al.Study of dynamic response of pile-plank embankment of bal-lastless track based on field test in Suining-Chongqing High-speed Railway[J].Rock and Soil Mechanics,2009,30(3):832-835.(in Chinese)
[9]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,JIANG Guan-lu,WEI Yong-xing.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)
[10]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,JIANG Guan-lu,NIU Guo-hui,et al.Model test investigation of pile-plank embankment of ballast-less truck for high-speed railway[J].Journal of Southwest Jiaotong University,2007,42(4):400-403,408.(in Chinese)
[11]丁兆锋.路基桩板结构平面简化法则及解析计算[J].铁道工程学报,2011(8):42-46.DING Zhao-feng.Plane simplified rules and analytical calcu-lation for pile-board structure of subgrade[J].Journal of Railway Engineering Society,2011(8):42-46.(in Chinese)
[12]李保俊,马坤全,张欣欣.高速铁路无砟轨道桩板结构路基动力特性研究[J].石家庄铁道大学学报:自然科学版,2011,24(1):63-68.LI Bao-jun,MA Kun-quan,ZHANG Xin-xin.Study on dynamic property of pile-plank embankment used in high-speed railway with slab-track[J].Journal of Shijiazhuang Tiedao University:Natural Science,2011,24(1):63-68.(in Chinese)
[13]罗照新,丁兆锋.客运专线桩板结构设计方法的探讨[J].铁道工程学报,2008(8):33-36.LUO Zhao-xin,DING Zhao-feng.Discussion on the design method of pile-slab structure for passenger dedicated railway[J].Journal of Railway Engineering Society,2008(8):33-36.(in Chinese)
[14]杨正国,罗照新.顶置分幅式路基桩板结构的应用与技术经济分析[J].高速铁路技术,2010,1(4):8-10,25.YANG Zheng-guo,LUO Zhao-xin.Application and tech-nical-economic analysis of top divided pile-board structure embankment[J].High Speed Railway Technology,2010,1(4):8-10,25.(in Chinese)
[15]姚洪锡.武广客运专线软土地基桩板结构设计与应用研究[D].成都:西南交通大学,2009.YAO Hong-xi.Study on the design and application of pile-board structure to soft soil ground for Wuhan-Guangzhou Passenger Dedicated Line[D].Chengdu:Southwest Jiaotong University,2009.(in Chinese)
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