不同桩长对无持力层刺入工况下刚性网格-桩加固路基的影响
|
摘要
根据刚性桩复合地基和桩承式路堤在有持力层刺入工况下的薄弱部位,分析刚性网格–桩复合地基中张拉网、刚性网格和附加桩对薄弱处的加固作用,研究有、无持力层刺入2种工况下刚性网格–桩复合地基受力和变形在不同桩长影响下的变化特征,对刚性网格–桩复合地基是否适用于无持力层工况进行可行性探讨。研究结果表明:在无持力层刺入工况下,刚性网格–桩复合地基大部分边桩弯矩和剪力较大,当桩长缩小,其分布区域向路堤中心方向扩散;当桩长增加,大部分桩桩体荷载比增大,边桩弯矩及剪力、路堤沉降和路堤外侧竖向变形减小;可通过增加桩长,利用PTC管桩放宽中桩截面,减小附加桩桩径,使刚性网格–桩复合地基实现优化并适用于无持力层刺入工况。
According to weak regions of rigid pile composite foundation and piled embankments with bearing stratum penetration,the reinforcement of weak regions by using stretching net,rigid grid and additional pile of rigid gird-pile composite foundation was analyzed.The changing characteristics of force and deformation of rigid grid-pile composite foundation with and without bearing stratum penetration were investigated under different pile lengths;and the feasibility whether the rigid grid-pile composite foundation is applicable to the case without bearing stratum penetration was evaluated.The results show that,without bearing stratum penetration,the bending moment and shear force of most side piles are large,and their distribution regions would increase along the direction of embankment center when the pile length decreases.When the pile length increases,the load ratio of most piles increases,and the bending moment and shear force of side pile,embankment settlement and vertical deformation outside the embankment decrease.By increasing the pile length,applying PTC pile to enlarging the cross-section of central pile,and decreasing the additional pile?s diameter,the rigid grid-pile composite foundation can be optimized and be applicable to the case of bearing stratum penetration.
According to weak regions of rigid pile composite foundation and piled embankments with bearing stratum penetration,the reinforcement of weak regions by using stretching net,rigid grid and additional pile of rigid gird-pile composite foundation was analyzed.The changing characteristics of force and deformation of rigid grid-pile composite foundation with and without bearing stratum penetration were investigated under different pile lengths;and the feasibility whether the rigid grid-pile composite foundation is applicable to the case without bearing stratum penetration was evaluated.The results show that,without bearing stratum penetration,the bending moment and shear force of most side piles are large,and their distribution regions would increase along the direction of embankment center when the pile length decreases.When the pile length increases,the load ratio of most piles increases,and the bending moment and shear force of side pile,embankment settlement and vertical deformation outside the embankment decrease.By increasing the pile length,applying PTC pile to enlarging the cross-section of central pile,and decreasing the additional pile?s diameter,the rigid grid-pile composite foundation can be optimized and be applicable to the case of bearing stratum penetration.
引文
[1]何宁,娄炎.路堤下刚性桩复合地基的设计计算方法研究[J].岩土工程学报,2011,33(5):797–802.(HE Ning,LOU Yan.Designand calculation method for rigid pile composite foundation underembankments[J].Chinese Journal of Geotechnical Engineering,2011,33(5):797–802.(in Chinese))
[2]宋二祥,武思宇,刘华北.刚性桩复合地基地震反应的拟静力计算方法[J].岩土工程学报,2009,31(11):1723–1728.(SONGErxiang,WU Siyu,LIU Huabei.Quasi-static calculation method forseismic response of rigid pile composite foundation[J].Chinese Journalof Geotechnical Engineering,2009,31(11):1 723–1 728.(in Chinese))
[3]曹卫平,陈云敏,陈仁朋.考虑路堤填筑过程与地基土固结相耦合的桩承式路堤土拱效应分析[J].岩石力学与工程学报,2008,27(8):1 610–1 617.(CAO Weiping,CHEN Yunmin,CHEN Renpeng.Analysis of soil arching in piled embankments considering coupledeffect of embankment filling and soil consolidation[J].ChineseJournal of Rock Mechanics and Engineering,2008,27(8):1 610–1 617.(in Chinese))
[4]ZHUANG Y,ELLIS E A,YU H S.Plane strain FE analysis ofarching in a piled embankment[J].Proceedings of the ICE—GroundImprovement,2010,163(4):207–215.
[5]VAN EEKELEN S J M,BEZUIJEN A,VAN TOL A F.Analysis andmodification of the British Standard BS8006 for the design of piledembankments[J].Geotextiles and Geomembranes,2011,29(3):345–359.
[6]KOUSIK D.A mathematical model to study the soil arching effect instone column-supported embankment resting on soft foundation soil[J].Applied Mathematical Modelling,2010,34(12):3 871–3 883.
[7]娄炎,何宁,娄斌.长短桩复合地基中的土拱效应及分析[J].岩土工程学报,2011,33(1):77–80.(LOU Yan,HE Ning,LOUBin.Analysis of soil arching of composite foundations with long andshort piles[J].Chinese Journal of Geotechnical Engineering,2011,33(1):77–80.(in Chinese))
[8]ZHENG G,JIANG Y,HAN J,et al.Performance of cement-fly ash-gravel pile-supported high-speed railway embankments over softmarine clay[J].Marine Georesources and Geotechnology,2011,29(2):145–161.
[9]龚晓南.广义复合地基理论及工程应用[J].岩土工程学报,2007,29(1):1–13.(GONG Xiaonan.Generalized composite foundationtheory and engineering application[J].Chinese Journal of GeotechnicalEngineering,2007,29(1):1–13.(in Chinese))
[10]张忠苗,喻君,张广兴.根据不同桩长对比试验优化设计桩持力层的研究[J].岩石力学与工程学报,2007,26(增2):4251–4257.(ZHANG Zhongmiao,YU Jun,ZHANG Guangxing.Study onoptimization design of pile bearing layer according to contrastive testswith different pile lengths[J].Chinese Journal of Rock Mechanics andEngineering,2007,26(Supp.2):4 251–4 257.(in Chinese))
[11]徐正中,陈仁朋,陈云敏.软土层未打穿的桩承式路堤现场实测研究[J].岩石力学与工程学报,2009,28(11):2336–2341.(XUZhengzhong,CHEN Renpeng,CHEN Yunmin.Study of in-situ dataof pile-supported embankment with pile partially penetrated in softsoils[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(11):2 336–2 341.(in Chinese))
[12]杨光华,李德吉,官大庶.刚性桩复合地基优化设计[J].岩石力学与工程学报,2011,30(4):818–825.(YANG Guanghua,LI Deji,GUAN Dashu.Optimization design of rigid pile composite foundation[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(4):818–825.(in Chinese))
[13]中华人民共和国行业标准编写组.JGJ94—2008建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.(The ProfessionalStandards Compilation Group of People s Republic of China.JGJ 94—2008 Technical code for building pile foundation[S].Beijing:ChinaArchitecture and Building Press,2008.(in Chinese))
[14]曾革,周志刚.桩承式加筋垫层路堤地基承载力计算方法[J].中南大学学报:自然科学版,2010,41(3):1158–1164.(ZENG Ge,ZHOU Zhigang.Calculation method for ground bearing capacity ofpile-supported reinforced cushion embankment[J].Journal of CentralSouth University:Science and Technology,2010,41(3):1 158–1 164.(in Chinese))
[15]JONES B M,PLAUT R H,FILZ G M.Analysis of geosyntheticreinforcement in pile-supported embankments,part I:3D platemodel[J].Geosynthetics International,2010,17(2):59–67.
[2]宋二祥,武思宇,刘华北.刚性桩复合地基地震反应的拟静力计算方法[J].岩土工程学报,2009,31(11):1723–1728.(SONGErxiang,WU Siyu,LIU Huabei.Quasi-static calculation method forseismic response of rigid pile composite foundation[J].Chinese Journalof Geotechnical Engineering,2009,31(11):1 723–1 728.(in Chinese))
[3]曹卫平,陈云敏,陈仁朋.考虑路堤填筑过程与地基土固结相耦合的桩承式路堤土拱效应分析[J].岩石力学与工程学报,2008,27(8):1 610–1 617.(CAO Weiping,CHEN Yunmin,CHEN Renpeng.Analysis of soil arching in piled embankments considering coupledeffect of embankment filling and soil consolidation[J].ChineseJournal of Rock Mechanics and Engineering,2008,27(8):1 610–1 617.(in Chinese))
[4]ZHUANG Y,ELLIS E A,YU H S.Plane strain FE analysis ofarching in a piled embankment[J].Proceedings of the ICE—GroundImprovement,2010,163(4):207–215.
[5]VAN EEKELEN S J M,BEZUIJEN A,VAN TOL A F.Analysis andmodification of the British Standard BS8006 for the design of piledembankments[J].Geotextiles and Geomembranes,2011,29(3):345–359.
[6]KOUSIK D.A mathematical model to study the soil arching effect instone column-supported embankment resting on soft foundation soil[J].Applied Mathematical Modelling,2010,34(12):3 871–3 883.
[7]娄炎,何宁,娄斌.长短桩复合地基中的土拱效应及分析[J].岩土工程学报,2011,33(1):77–80.(LOU Yan,HE Ning,LOUBin.Analysis of soil arching of composite foundations with long andshort piles[J].Chinese Journal of Geotechnical Engineering,2011,33(1):77–80.(in Chinese))
[8]ZHENG G,JIANG Y,HAN J,et al.Performance of cement-fly ash-gravel pile-supported high-speed railway embankments over softmarine clay[J].Marine Georesources and Geotechnology,2011,29(2):145–161.
[9]龚晓南.广义复合地基理论及工程应用[J].岩土工程学报,2007,29(1):1–13.(GONG Xiaonan.Generalized composite foundationtheory and engineering application[J].Chinese Journal of GeotechnicalEngineering,2007,29(1):1–13.(in Chinese))
[10]张忠苗,喻君,张广兴.根据不同桩长对比试验优化设计桩持力层的研究[J].岩石力学与工程学报,2007,26(增2):4251–4257.(ZHANG Zhongmiao,YU Jun,ZHANG Guangxing.Study onoptimization design of pile bearing layer according to contrastive testswith different pile lengths[J].Chinese Journal of Rock Mechanics andEngineering,2007,26(Supp.2):4 251–4 257.(in Chinese))
[11]徐正中,陈仁朋,陈云敏.软土层未打穿的桩承式路堤现场实测研究[J].岩石力学与工程学报,2009,28(11):2336–2341.(XUZhengzhong,CHEN Renpeng,CHEN Yunmin.Study of in-situ dataof pile-supported embankment with pile partially penetrated in softsoils[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(11):2 336–2 341.(in Chinese))
[12]杨光华,李德吉,官大庶.刚性桩复合地基优化设计[J].岩石力学与工程学报,2011,30(4):818–825.(YANG Guanghua,LI Deji,GUAN Dashu.Optimization design of rigid pile composite foundation[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(4):818–825.(in Chinese))
[13]中华人民共和国行业标准编写组.JGJ94—2008建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.(The ProfessionalStandards Compilation Group of People s Republic of China.JGJ 94—2008 Technical code for building pile foundation[S].Beijing:ChinaArchitecture and Building Press,2008.(in Chinese))
[14]曾革,周志刚.桩承式加筋垫层路堤地基承载力计算方法[J].中南大学学报:自然科学版,2010,41(3):1158–1164.(ZENG Ge,ZHOU Zhigang.Calculation method for ground bearing capacity ofpile-supported reinforced cushion embankment[J].Journal of CentralSouth University:Science and Technology,2010,41(3):1 158–1 164.(in Chinese))
[15]JONES B M,PLAUT R H,FILZ G M.Analysis of geosyntheticreinforcement in pile-supported embankments,part I:3D platemodel[J].Geosynthetics International,2010,17(2):59–67.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心