考虑桩体损伤的PHC管桩复合地基变形与稳定性分析
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摘要
依托普洱车站软弱地基上的超高填方工程,采用ABAQUS中的混凝土损伤塑性模型构建了路堤荷载下考虑桩体损伤的PHC管桩复合地基的三维数值模型,探讨了PHC管桩桩体的变形特征,并根据边桩特征点的侧向变形分析其稳定性。结果表明:采用PHC管桩复合地基可显著控制路堤变形;且相较于常规的线弹性模型,采用混凝土损伤塑性模型可较好地反映PHC管桩刚度退化后的变形特征,并能合理确定PHC管桩复合地基的安全系数。
Based on the super high fill engineering on the soft foundation at Pu' er Station,by use of the concrete damage plasticity model in ABAQUS,a three-dimensional numerical model of PHC pipe pile composite foundation with the consideration of damages to the pile body under the embankment load,was constituted,by which the deformation characteristics of PHC pipe pile body was discussed,and the stability thereof was analyzed according to the lateral deformation at the feature point of side piling.The results show that PHC pipe pile composite foundation may control the embankment deformation significantly;and compared to conventional linear elastic model,the concrete damage plasticity model used may well reflect the deformation characteristics of PHC pipe pile after stiffness degeneration,and determine the safety coefficient of PHC pipe pile composite foundation reasonably.
Based on the super high fill engineering on the soft foundation at Pu' er Station,by use of the concrete damage plasticity model in ABAQUS,a three-dimensional numerical model of PHC pipe pile composite foundation with the consideration of damages to the pile body under the embankment load,was constituted,by which the deformation characteristics of PHC pipe pile body was discussed,and the stability thereof was analyzed according to the lateral deformation at the feature point of side piling.The results show that PHC pipe pile composite foundation may control the embankment deformation significantly;and compared to conventional linear elastic model,the concrete damage plasticity model used may well reflect the deformation characteristics of PHC pipe pile after stiffness degeneration,and determine the safety coefficient of PHC pipe pile composite foundation reasonably.
引文
[1]崔俊杰,韩志霞.客运专线预应力混凝土管桩复合地基应用研究[J].路基工程,2010(增刊1):67-70.CUI J J,HAN Z X.Application study on composite foundation with prestressed concrete pile in passenger dedicated line[J].Subgrade Engineering,2010(S1):67-70.
[2]万年华.预应力管桩复合地基在公路工程软土地基中的应用[J].中外公路,2013,33(4):49-53.
[3]董海钊,王李平,田雨普,等.PHC管桩复合地基在引黄闸基础处理中的应用[J].人民黄河,2015,37(2):127-129.DONG H Z,WANG L P,TIAN Y P,et al.Study on application of composite foundation treatment with PHC pipe pile in Yellow River division sluice foundation[J].Yellow River,2015,37(2):127-129.
[4]王维俊,张立,李伟科,等.岩溶地区复合地基静压PHC管桩应用分析[J].建筑结构,2018,48(9):112-115,96.WANG W J,ZHANG L,LI W K,et al.Application analysis of static pressure PHC pipe pile in composite foundation in karst district[J].Building Structure,2018,48(9):112-115,96.
[5]顾行文,黄炜旺,谭祥韶,等.基底倾斜的管桩复合地基路堤破坏模式研究[J].岩土工程学报,2017,39(增刊1):204-208.GU X W,HUANG W W,TAN X S,et al.Failure mechanisms of embankment on inclined soft foundation reinforced by pipe piles[J].Chinese Journal of Geotechnical Engineering,2017,39(S1):204-208.
[6]邵国霞,苏谦,尹紫红,等.不同垫层下管桩复合地基现场对比试验研究[J].西南交通大学学报,2018,53(2):279-285.SHAO G X,SU Q,YIN Z H,et al.Field comparative experiments of pipe pile composite foundation with different cushion layers[J].Journal of Southwest Jiaotong University,2018,53(2):279-285.
[7]姜彦彬,何宁,林志强,等.路堤深厚软基管桩复合地基数值模拟[J].水利水运工程学报,2018(2):43-51.JIANG Y B,HE N,LIN Z Q,et al.Numerical simulation of pipe pile composite foundation of deep soft foundation under embankment[J].Hydroscience and Engineering,2018(2):43-51.
[8]陈国升,杨美玲,何江斌,等.长短桩复合地基承载性能分析[J].公路工程,2018,43(1):114-117.CHEN G S,YANG M L,HE J B,et al.Bearing capacity analysis of long short pile composite foundation[J].Highway Engineering,2018,43(1):114-117.
[9]李英杰.垫层结构对预应力混凝土管桩复合地基承载力影响因素研究[J].高速铁路技术,2015,6(5):34-38.LI Y J.Research on the influencing factors on the composite foundation bearing capacity of prestressed concrete pipe pile by cushion structure[J].High Speed Railway Technology,2015,6(5):34-38.
[10]GB50011-2010混凝土结构设计规范(附条文说明)[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&Building Press,2010.
[11]赵尚毅,郑颖人,张玉芳.极限分析有限元法讲座(Ⅱ)---有限元强度折减法中边坡失稳的判据探讨[J].岩土力学,2005,26(2):332-336.ZHAO S Y,ZENG Y R,ZHANG Y F.Study on slope failure criterion in strength reduction finite element method[J].Rock and Soil Mechanics,2005,26(2):332-336.
[12]李垠,程丹,苏凯.基于有限元强度折减法的边坡失稳判据统一性研究[J].大地测量与地球动力学,2016,36(1):69-74.LI Y,CHENG D,SU K.Study on consistence of slope stability criteria based on the finite element strength reduction method[J].Journal of Geodesy and Geodynamics,2016,36(1):69-74.
[13]闫超,刘松玉,邓永锋.一种基于强度折减法的刚性桩复合地基整体稳定性评价方法研究[J].岩土力学,2017,38(3):875-882.YAN C,LIU S Y,DENG Y F.A method of evaluating integral stability of rigid pile composite foundation based on strength reduction method[J].Rock and Soil Mechanics,2017,38(3):875-882.
[2]万年华.预应力管桩复合地基在公路工程软土地基中的应用[J].中外公路,2013,33(4):49-53.
[3]董海钊,王李平,田雨普,等.PHC管桩复合地基在引黄闸基础处理中的应用[J].人民黄河,2015,37(2):127-129.DONG H Z,WANG L P,TIAN Y P,et al.Study on application of composite foundation treatment with PHC pipe pile in Yellow River division sluice foundation[J].Yellow River,2015,37(2):127-129.
[4]王维俊,张立,李伟科,等.岩溶地区复合地基静压PHC管桩应用分析[J].建筑结构,2018,48(9):112-115,96.WANG W J,ZHANG L,LI W K,et al.Application analysis of static pressure PHC pipe pile in composite foundation in karst district[J].Building Structure,2018,48(9):112-115,96.
[5]顾行文,黄炜旺,谭祥韶,等.基底倾斜的管桩复合地基路堤破坏模式研究[J].岩土工程学报,2017,39(增刊1):204-208.GU X W,HUANG W W,TAN X S,et al.Failure mechanisms of embankment on inclined soft foundation reinforced by pipe piles[J].Chinese Journal of Geotechnical Engineering,2017,39(S1):204-208.
[6]邵国霞,苏谦,尹紫红,等.不同垫层下管桩复合地基现场对比试验研究[J].西南交通大学学报,2018,53(2):279-285.SHAO G X,SU Q,YIN Z H,et al.Field comparative experiments of pipe pile composite foundation with different cushion layers[J].Journal of Southwest Jiaotong University,2018,53(2):279-285.
[7]姜彦彬,何宁,林志强,等.路堤深厚软基管桩复合地基数值模拟[J].水利水运工程学报,2018(2):43-51.JIANG Y B,HE N,LIN Z Q,et al.Numerical simulation of pipe pile composite foundation of deep soft foundation under embankment[J].Hydroscience and Engineering,2018(2):43-51.
[8]陈国升,杨美玲,何江斌,等.长短桩复合地基承载性能分析[J].公路工程,2018,43(1):114-117.CHEN G S,YANG M L,HE J B,et al.Bearing capacity analysis of long short pile composite foundation[J].Highway Engineering,2018,43(1):114-117.
[9]李英杰.垫层结构对预应力混凝土管桩复合地基承载力影响因素研究[J].高速铁路技术,2015,6(5):34-38.LI Y J.Research on the influencing factors on the composite foundation bearing capacity of prestressed concrete pipe pile by cushion structure[J].High Speed Railway Technology,2015,6(5):34-38.
[10]GB50011-2010混凝土结构设计规范(附条文说明)[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&Building Press,2010.
[11]赵尚毅,郑颖人,张玉芳.极限分析有限元法讲座(Ⅱ)---有限元强度折减法中边坡失稳的判据探讨[J].岩土力学,2005,26(2):332-336.ZHAO S Y,ZENG Y R,ZHANG Y F.Study on slope failure criterion in strength reduction finite element method[J].Rock and Soil Mechanics,2005,26(2):332-336.
[12]李垠,程丹,苏凯.基于有限元强度折减法的边坡失稳判据统一性研究[J].大地测量与地球动力学,2016,36(1):69-74.LI Y,CHENG D,SU K.Study on consistence of slope stability criteria based on the finite element strength reduction method[J].Journal of Geodesy and Geodynamics,2016,36(1):69-74.
[13]闫超,刘松玉,邓永锋.一种基于强度折减法的刚性桩复合地基整体稳定性评价方法研究[J].岩土力学,2017,38(3):875-882.YAN C,LIU S Y,DENG Y F.A method of evaluating integral stability of rigid pile composite foundation based on strength reduction method[J].Rock and Soil Mechanics,2017,38(3):875-882.