软土深基坑双排桩支护结构的影响因素分析
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摘要
基于软土地区的某深基坑双排桩支护工程,采用有限单元法建立了三维仿真计算模型对双排桩的受力和位移特性进行计算,系统分析了双排桩排间距、桩径以及前后排桩长等影响因素对双排桩支护结构受力和位移的影响,得到该软土基坑工程双排桩支护结构的最佳排间距、桩径和桩长。结果表明:当双排桩桩径取0.8~1.0 m、排间距取桩径的3~4倍时,排桩的弯矩分布和桩身的位移比较合理,可以最大化地发挥双排桩的支护作用;相比于后排桩桩长,增加前排桩的桩长对提高支护结构的稳定性更有效。
A 3D finite element model was established to calculate the forces and displacements of the double-row pile retaining structure of a foundation pit in soft soil area. The influences of row distance,pile diameter and pile length on the force and displacement of the structure are analysed in order to get the optimal pile row spacing,pile diameter and pile length. Results show that the distribution of bending moment and the displacement of pile are reasonable when the pile diameter is 0. 8m-1. 0m and the row distance is 3 to 4 times the pile diameter. Increasing the length of front pile is more effective to improving the stability of the retaining structure than increasing the length of back pile.
A 3D finite element model was established to calculate the forces and displacements of the double-row pile retaining structure of a foundation pit in soft soil area. The influences of row distance,pile diameter and pile length on the force and displacement of the structure are analysed in order to get the optimal pile row spacing,pile diameter and pile length. Results show that the distribution of bending moment and the displacement of pile are reasonable when the pile diameter is 0. 8m-1. 0m and the row distance is 3 to 4 times the pile diameter. Increasing the length of front pile is more effective to improving the stability of the retaining structure than increasing the length of back pile.
引文
[1]付文光,杨志银.深圳地区基坑工程30年发展综述[J].岩土工程学报,2010,32(增2):562-565.(FU Wen-guang,YANG Zhi-yin.Summaries of Excavation Pit Engineering in Shenzhen in Recent 30 Years[J].Chinese Journal of Geotechnical Engineering,2010,32(Sup.2):562-565.(in Chinese))
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[3]聂庆科,胡建敏,吴刚.深基坑双排桩支护结构上的变形和土压力研究[J].岩土力学,2008,29(11):3089-3094.(NIE Qing-ke,HU Jian-min,WU Gang.Deformation and Earth Pressure of a Double-row Piles Retaining Structure for Deep Excavation[J].Rock and Soil Mechanics,2008,29(11):3089-3094.(in Chinese))
[4]刘泉声,付建军.考虑桩土效应的双排桩模型及参数研究[J].岩土力学,2011,32(2):481-486.(LIU Quan-sheng,FU Jian-jun.Research on Model and Parameters of Double-row Piles Based on Effect of Pile-soil Contact[J].Rock and Soil Mechanics,2011,32(2):481-486.(in Chinese))
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[6]杜秀忠,杨光华,孙昌利,等.双排桩支护在某水利基坑中的应用[J].岩土工程学报,2012,34(增1):490-494.(DU Xiu-zhong,YANG Guang-hua,SUN Chang-li,et al.Application of Retaining Structure with Double-row Piles in a Hydraulic Excavation[J].Chinese Journal of Geotechnical Engineering,2012,34(Sup.1):490-494.(in Chinese))
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[8]王军,王磊,肖昭然.双排桩支护排距的有限元分析与研究[J].地下空间与工程学报,2005,1(6):1096-1099.(WANG Jun,WANG Lei,XIAO Zhaoran.Analysis of the Interval between Double-row Piles by Finite Element Method[J].Chinese Journal of Underground Space and Engineering,2005,1(6):1096-1099.(in Chinese))
[9]钱同辉,陈芳,程周炳,等.框架式双排抗滑桩结构性能研究[J].长江科学院院报,2011,28(11):91-95.(QIAN Tong-hui,CHEN Fang,CHENG Zhoubing,et al.Analysis on the Performance of Double-row Anti-Slide Frame-Piles[J].Journal of Yangtze River Scientific Research Institute,2011,28(11):91-95.(in Chinese))
[10]杨保全,丘滨,陈先威.双排桩结构特性及桩体位移有限元计算分析[J].长江科学院院报,2009,26(7):52-55.(YANG Bao-quan,QIU Bin,CHEN Xian-wei.Deformation Analysis of Double Row Piles by Finite Element Method[J].Journal of Yangtze River Scientific Research Institute,2009,26(7):52-55.(in Chinese))
[11]史海莹,龚晓南.深基坑悬臂双排桩支护的受力性状研究[J].工业建筑,2009,46(10):67-71.(SHI Hai-ying,GONG Xiao-nan.Study on the Behavior of Cantilever Double-row Plies Supporting Deep Excavation[J].Industrial Construction,2009,46(10):67-71.(in Chinese))
[12]应宏伟,初振环,李冰河,等.双排桩支护结构的计算方法研究及工程应用[J].岩土力学,2007,28(6):1145-1150.(YING Hong-wei,CHU Zhenhuan,LI Bing-he,et al.Study on Calculation Method of Retaining Structure with Double-row Piles and Its Application[J].Rock and Soil Mechanics,2007,28(6):1145-1150.(in Chinese))
[13]白冰,聂庆科,吴刚,等.考虑空间效应的深基坑双排桩支护结构计算模型[J].建筑结构学报,2010,31(8):118-124.(BAI Bing,NIE Qing-ke,WU Gang,et al.A Calculation Model for Double-rowpile Retaining Structures in Deep Foundation Pit Considering 3D Effects[J].Journal of Building Structures,2010,31(8):118-124.(in Chinese))
[14]秦四清,万林海,汤天鹏,等.深基坑工程优化设计[M].北京:地震出版社,1998.(QIN Si-qing,WAN Lin-hai,TANG Tian-peng,et al.Optimizing Design on Deep Excavation[M].Beijing:Seismological Press,1998.(in Chinese))
[2]董必昌,邱红胜.双排桩对边坡稳定影响分析的仿真研究[J].武汉理工大学学报(交通科学与工程版),2007,31(3):502-505.(DONG Bi-chang,QIU Hong-sheng.Simulation Study on Stability of Slope with Double-row Piles[J].Journal of Wuhan University of Technology(Transportation Science&Engineering),2007,31(3):502-505.(in Chinese))
[3]聂庆科,胡建敏,吴刚.深基坑双排桩支护结构上的变形和土压力研究[J].岩土力学,2008,29(11):3089-3094.(NIE Qing-ke,HU Jian-min,WU Gang.Deformation and Earth Pressure of a Double-row Piles Retaining Structure for Deep Excavation[J].Rock and Soil Mechanics,2008,29(11):3089-3094.(in Chinese))
[4]刘泉声,付建军.考虑桩土效应的双排桩模型及参数研究[J].岩土力学,2011,32(2):481-486.(LIU Quan-sheng,FU Jian-jun.Research on Model and Parameters of Double-row Piles Based on Effect of Pile-soil Contact[J].Rock and Soil Mechanics,2011,32(2):481-486.(in Chinese))
[5]何颐华,杨斌,金宝森,等.双排护坡桩试验与计算的研究[J].建筑结构学报,1996,17(2):58-66.(HE Yi-hua,YANG Bin,JIN Bao-sen,et al.A Study of the Test and Calculation of Double-row Fender Piles[J].Journal of Building Structures,1996,17(2):58-66.(in Chinese))
[6]杜秀忠,杨光华,孙昌利,等.双排桩支护在某水利基坑中的应用[J].岩土工程学报,2012,34(增1):490-494.(DU Xiu-zhong,YANG Guang-hua,SUN Chang-li,et al.Application of Retaining Structure with Double-row Piles in a Hydraulic Excavation[J].Chinese Journal of Geotechnical Engineering,2012,34(Sup.1):490-494.(in Chinese))
[7]孙涛,刘俊岩,刘燕.双排桩支护排距的优化研究[J].岩土工程学报,2012,34(增1):616-620.(SUN Tao,LIU Jun-yan,LIU Yan.Optimal Row Distance of Retaining Structure with Double-row Piles[J].Chinese Journal of Geotechnical Engineering,2012,34(Sup.1):616-620.(in Chinese))
[8]王军,王磊,肖昭然.双排桩支护排距的有限元分析与研究[J].地下空间与工程学报,2005,1(6):1096-1099.(WANG Jun,WANG Lei,XIAO Zhaoran.Analysis of the Interval between Double-row Piles by Finite Element Method[J].Chinese Journal of Underground Space and Engineering,2005,1(6):1096-1099.(in Chinese))
[9]钱同辉,陈芳,程周炳,等.框架式双排抗滑桩结构性能研究[J].长江科学院院报,2011,28(11):91-95.(QIAN Tong-hui,CHEN Fang,CHENG Zhoubing,et al.Analysis on the Performance of Double-row Anti-Slide Frame-Piles[J].Journal of Yangtze River Scientific Research Institute,2011,28(11):91-95.(in Chinese))
[10]杨保全,丘滨,陈先威.双排桩结构特性及桩体位移有限元计算分析[J].长江科学院院报,2009,26(7):52-55.(YANG Bao-quan,QIU Bin,CHEN Xian-wei.Deformation Analysis of Double Row Piles by Finite Element Method[J].Journal of Yangtze River Scientific Research Institute,2009,26(7):52-55.(in Chinese))
[11]史海莹,龚晓南.深基坑悬臂双排桩支护的受力性状研究[J].工业建筑,2009,46(10):67-71.(SHI Hai-ying,GONG Xiao-nan.Study on the Behavior of Cantilever Double-row Plies Supporting Deep Excavation[J].Industrial Construction,2009,46(10):67-71.(in Chinese))
[12]应宏伟,初振环,李冰河,等.双排桩支护结构的计算方法研究及工程应用[J].岩土力学,2007,28(6):1145-1150.(YING Hong-wei,CHU Zhenhuan,LI Bing-he,et al.Study on Calculation Method of Retaining Structure with Double-row Piles and Its Application[J].Rock and Soil Mechanics,2007,28(6):1145-1150.(in Chinese))
[13]白冰,聂庆科,吴刚,等.考虑空间效应的深基坑双排桩支护结构计算模型[J].建筑结构学报,2010,31(8):118-124.(BAI Bing,NIE Qing-ke,WU Gang,et al.A Calculation Model for Double-rowpile Retaining Structures in Deep Foundation Pit Considering 3D Effects[J].Journal of Building Structures,2010,31(8):118-124.(in Chinese))
[14]秦四清,万林海,汤天鹏,等.深基坑工程优化设计[M].北京:地震出版社,1998.(QIN Si-qing,WAN Lin-hai,TANG Tian-peng,et al.Optimizing Design on Deep Excavation[M].Beijing:Seismological Press,1998.(in Chinese))
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