刚性桩复合地基路基绕流滑动稳定分析
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摘要
针对整体滑动稳定性满足规范要求的部分刚性桩复合地基路基发生滑塌的现实,分析了刚性桩复合地基路基可能的破坏模式,指出桩间荷载较大且桩间土软弱时可能会发生绕流滑动破坏,对刚性桩复合地基路基建议同时进行整体滑动稳定分析、绕流滑动稳定性分析和毁桩验算等。分析了刚性桩对滑动体的作用力并给出了相应的计算方法,通过对路堤荷载进行折减处理以及将桩周摩擦力转换至加固区地基土重度等措施,提出了绕流滑动稳定分析简化方法。工程实例表明,该方法合理可行。基于刚性桩复合地基路基绕流滑动稳定分析,对路基下刚性桩复合地基设计提出了建议。
Since some embankments improved by rigid-pile composite ground slid although their safety factors of overall stability meet the requirements of the codes,the possible failure models of embankment on rigid-pile composite ground are analyzed.It points out that flow-slide may occur if load among piles is large and soil among piles is soft.It is proposed that stability analysis of overall slide,stability analysis of flow-slide and check of flexural capacity of rigid-piles should all be carried out.The pile force to sliding body is analyzed and the calculation method is advised.Simplified method for stability analysis of flow-slide of embankment on rigid-pile composite ground is put forth on the basis of reducing the embankment load,converting the pile friction force to soil weight and other simplified measures.The simplified method for stability analysis of flow-slide is proved reasonable and practicable.Proposals for rigid-pile composite ground are put forward based on the analysis of flow-sliding stability of rigid-pile composite embankment.
Since some embankments improved by rigid-pile composite ground slid although their safety factors of overall stability meet the requirements of the codes,the possible failure models of embankment on rigid-pile composite ground are analyzed.It points out that flow-slide may occur if load among piles is large and soil among piles is soft.It is proposed that stability analysis of overall slide,stability analysis of flow-slide and check of flexural capacity of rigid-piles should all be carried out.The pile force to sliding body is analyzed and the calculation method is advised.Simplified method for stability analysis of flow-slide of embankment on rigid-pile composite ground is put forth on the basis of reducing the embankment load,converting the pile friction force to soil weight and other simplified measures.The simplified method for stability analysis of flow-slide is proved reasonable and practicable.Proposals for rigid-pile composite ground are put forward based on the analysis of flow-sliding stability of rigid-pile composite embankment.
引文
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[2]朱旭华,舒国明.广珠北新围高架桥桥头路基滑移原因分析[J].中外公路,2006,26(4):27～29.
[3]沈珠江.桩的抗滑阻力和抗滑桩的极限设计[J].岩土工程学报,1992,14(1):51～56.
[4]Kitazume M and Maruyama K.Collapse failure of group columnstype deep mixing improved ground under embankment[A].Proc.of the International Conference on Deep Mixing 05[C].Stockholm,ASCE,2005,245～254.
[5]Kitazume M and Kenji Maruyama.External stability of groupcolumn type deep mixing improved ground under embankment[J].Soils and Foundations,2006,46(3):323～340.
[6]Kitazume M and Kenji Maruyama.Internal stability of groupcolumn type deep mixing improved ground under embankmentloading[J].Soils and Foundations,2007,47(3):437～455.
[7]Han J,Chai J C,Dov L,et al.Evaluation of deep-seated slopestability of embankments over deep mixed foundations[J].ASCE Geo-Support,2004.
[8]Kitazume M,Okano K,Miyajima S.Centrifuge model tests onfailure envelope of column type mixing method improved ground[J].Soils and Foundations,2000,40(4):43～55.
[9]中华人民共和国地方标准.广东省公路软土地基设计与施工技术规定(GDJTG/T E01-2011)[S].北京:人民交通出版社,2012.
[10]浙江省交通规划设计研究院.浙江省公路软土地基路堤设计要点[S].北京:人民交通出版社,2009.
[11]中华人民共和国地方标准.复合地基技术规程(DB33/1051-2008)[S].北京:中国计划出版社,2008.
[12]Terashi M,Tanaka H,Kitazume M.Extrusion failure of groundimproved by the deep mixing method[A].Proceedings of theSeventh Asian Regional Conference on Soil Mechanics andFoundation Engineering[C].Taligraph Ltd,Isr,1983:313～318.
[13]陈云敏,贾宁,陈仁朋.桩承式路堤土拱效应分析[J].中国公路学报,2004,17(4):1～6.
[14]刘吉福.路堤下复合地基“三等沉区模型”[J].岩土力学,2007,28(S1):798～802.
[15]周万欢.堆载固结过程中单桩负摩擦力性状研究[D].浙江大学,2005:58.
[16]蔡波.饱和软粘土地基沉降速率的计算方法[J].中国港湾建设,2008,(4):11～12.
[17]童建国,朱瑞燕.固结软土中单桩负摩擦离心机模型试验研究[J].电力勘测设计,2006,(1):12～15,23.
[18]杭红星.路桥过渡段沉降特性离心模型试验研究[D].成都:西南交通大学,2011.
[19]黄茂松,李波,程岳.长短桩组合路堤桩荷载分担规律离心模型试验与数值模拟[J].岩石力学与工程学报,2010,29(12):2543～2550.
[20]黄强.桩基工程若干热点技术问题[M].北京:中国建材工业出版社,1998.
[21]中华人民共和国行业标准.铁路桥涵地基和基础设计规范(TB10002.5～2005,J464-2005)[S].北京:中国铁道出版社,2009.
[22]林壮宏,李根存,林文强.某高速公路填石路基滑塌分析及处理方案[A].见龚晓南主编.高速公路地基处理理论与实践[M].北京:人民交通出版社,2005.
[23]中华人民共和国国家标准.复合地基技术规范(GB/T50783-2012)[S].北京:中国计划出版社,2013.
[24]中华人民共和国行业标准.铁路工程地基处理技术规程(TB10106-2010,J1078-2010)[S].北京:中国铁道出版社,2010.