不同截面型式抗滑桩加固边坡数值分析
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摘要
当前国内外抗滑桩主要采用圆形和矩形两种截面型式,而不同型式抗滑桩加固边坡的效果不同,施工方法和工程造价亦不同.为此,针对T形、正方形、矩形、正五边形、正六边形、圆形等6种不同截面型式的抗滑桩,采用弹塑性有限元强度折减法,计算了边坡岩土体在强度折减系数分别为1.35和1.50时6种桩型抗滑桩的桩身内力反应,并进行了加固效果的对比分析;在此基础上,深入研究了抗滑桩-边坡体系的整体稳定性及桩间的土拱效应.结果表明,抗滑桩加固潜在滑移坡体时,在特定桩间距范围内会产生土拱;不同截面型式抗滑桩引起的土拱形状不同,桩间的土拱现象在一定程度上能够反映不同桩型抗滑桩的作用机制和加固效果.
In the current practice,anti-slide piles are mainly designed in the form of circle and rectangle at home and abroad.However,the slope stabilization effects using the anti-slide piles with different forms of cross sections are completely different,and cross-section forms of stabilizing piles also affect the construction technology and the project cost.So elasto-plastic finite element method(FEM)combined with strength reduction technique is employed to investigate the reinforcing effects of different cross-sections of piles,such as T-shaped,square,rectangle,pentagon,hexagon and circular cross-sections,the stability of slope-pile systems and the internal forces of piles are also calculated when the strength reduction factor is equal to 1.35and 1.50,respectively.Moreover,the soil arching between the adjacent two piles is further investigated.The experimental results show that when the anti-slide piles are used to stabilize a potential instability slope,soil arching phenomena will be made in certain pile spacing.Different cross sections for anti-slide piles lead to different shapes of soil arching.The soil arching can reflect the working performance of anti-slide piles and load transfer mechanism for a slope-pile system to a certain extent.
In the current practice,anti-slide piles are mainly designed in the form of circle and rectangle at home and abroad.However,the slope stabilization effects using the anti-slide piles with different forms of cross sections are completely different,and cross-section forms of stabilizing piles also affect the construction technology and the project cost.So elasto-plastic finite element method(FEM)combined with strength reduction technique is employed to investigate the reinforcing effects of different cross-sections of piles,such as T-shaped,square,rectangle,pentagon,hexagon and circular cross-sections,the stability of slope-pile systems and the internal forces of piles are also calculated when the strength reduction factor is equal to 1.35and 1.50,respectively.Moreover,the soil arching between the adjacent two piles is further investigated.The experimental results show that when the anti-slide piles are used to stabilize a potential instability slope,soil arching phenomena will be made in certain pile spacing.Different cross sections for anti-slide piles lead to different shapes of soil arching.The soil arching can reflect the working performance of anti-slide piles and load transfer mechanism for a slope-pile system to a certain extent.
引文
[1]中华人民共和国国土资源部.DZ 0240-2004滑坡防治工程设计与施工技术规范[S].北京:中国标准出版社,2006.Ministry of Land and Resource of the People′s Republic of China.DZ 0240-2004 Landslide Control Engineering Design and Construction Technical Specifications[S].Beijing:China Standard Press,2006.(in Chinese)
[2]年廷凯,栾茂田,杨庆.考虑地震效应的阻滑桩加固土坡简化分析方法[J].大连理工大学学报,2007,47(5):718-722.NIAN Ting-kai,LUAN Mao-tian,YANG Qing.Simplified analytical procedure of stabilizing piles against sliding considering earthquake effect[J].Journal of Dalian University of Technology,2007,47(5):718-722.(in Chinese)
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[4]Zienkiewicz O C,Humpheson C,Lewis R W.Associated and non-associated visco-plasticity and plasticity in soil mechanics[J].Geotechnique,1975,25(4):671-689.
[5]Griffiths D V,Lane P A.Slope stability analysis by finite elements[J].Geotechnique,1999,49(3):387-403.
[6]Griffiths D V,Marquez R M.Three-dimensional slope stability analysis by elasto-plastic finite element[J].Geotechnique,2007,57(6):537-546.
[7]Cai F,Ugai K.Numerical analysis of the stability of a slope reinforced with piles[J].Soils and Foundations,2000,40(1):73-84.
[8]张建华,谢强,张照秀.抗滑桩结构的土拱效应及其数值模拟[J].岩石力学与工程学报,2004,23(4):699-703.ZHANG Jian-hua,XIE Qiang,ZHANG Zhao-xiu.Arching effect of anti-slide pile structure and its numerical simulation[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(4):699-703.(in Chinese)
[9]Won J,You K,Jeong S,et al.Coupled effects in stability analysis of pile-slope systems[J].Computers and Geotechnics,2005,32(8):304-315.
[10]Wei W B,Cheng Y M.Strength reduction analysis for slope reinforced with one row of piles[J].Computers and Geotechnics,2009,36(7):1176-1185.
[11]高长胜,陈生水,杨守华,等.基于强度折减有限单元法的抗滑桩加固边坡特性分析[J].水利与建筑工程学报,2010,8(4):119-122.GAO Chang-sheng,CHEN Sheng-shui,YANG Shou-hua,et al.Analysis for slope stability reinforced with anti-slide piles based on strength reduction method with 3D FEM[J].Journal of Water Resources and Architectural Engineering,2010,8(4):119-122.(in Chinese)
[12]Liang R,Zeng S.Numerical study of soil arching mechanism in drilled shafts for slope stabilization[J].Soils and Foundations,2002,42(2):83-92.
[13]吕庆,孙红月,尚岳全.抗滑桩桩后土拱形状及影响因素[J].哈尔滨工业大学学报,2010,42(4):629-633.LYU Qing,SUN Hong-yue,SHANG Yue-quan.Shape of soil arch behind anti-slide piles and its major influence factors[J].Journal of Harbin Institute of Technology,2010,42(4):629-633.(in Chinese)
[14]赵明华,廖彬彬,刘思思.基于拱效应的边坡抗滑桩桩间距计算[J].岩土力学,2010,31(4):1211-1216.ZHAO Ming-hua,LIAO Bin-bin,LIU Si-si.Calculation of anti-slide piles spacing based on soil arching effect[J].Rock and Soil Mechanics,2010,31(4):1211-1216.(in Chinese)
[15]Terzaghi K.Theoretical Soil Mechanics[M].New York:John Wiley and Sons,1943.
[16]Imbsen and Associates,Inc.XTRACT Ver.3.0.3[Z].Sacramento:Imbsen and Associates,Inc.,2000.
[17]中华人民共和国建设部.GB 50010—2002混凝土结构设计规范[S].北京:中国建筑工业出版社,2002.The Ministry of Construction of the People′s Republic of China.GB 50010—2002 Design of Concrete Structures[S].Beijing:China Building Industry Press,2002.(in Chinese)
[18]中华人民共和国住房和城乡建设部.JGJ 94—2008建筑桩基技术规范[S]北京:中国建筑工业出版社,2008.The Ministry of Housing and Urban-Rural Construction of the People′s Republic of China.JGJ94—2008 Building Pile Technical Specifications[S].Beijing:China Building Industry Press,2008.(in Chinese)
[2]年廷凯,栾茂田,杨庆.考虑地震效应的阻滑桩加固土坡简化分析方法[J].大连理工大学学报,2007,47(5):718-722.NIAN Ting-kai,LUAN Mao-tian,YANG Qing.Simplified analytical procedure of stabilizing piles against sliding considering earthquake effect[J].Journal of Dalian University of Technology,2007,47(5):718-722.(in Chinese)
[3]徐海洋.考虑土拱效应的抗滑桩加固边坡数值分析[D].大连:大连理工大学,2012.XU Hai-yang.Numerical analysis of a slope reinforced with anti-slide piles considering soil arching effect[D].Dalian:Dalian University of Technology,2012.(in Chinese)
[4]Zienkiewicz O C,Humpheson C,Lewis R W.Associated and non-associated visco-plasticity and plasticity in soil mechanics[J].Geotechnique,1975,25(4):671-689.
[5]Griffiths D V,Lane P A.Slope stability analysis by finite elements[J].Geotechnique,1999,49(3):387-403.
[6]Griffiths D V,Marquez R M.Three-dimensional slope stability analysis by elasto-plastic finite element[J].Geotechnique,2007,57(6):537-546.
[7]Cai F,Ugai K.Numerical analysis of the stability of a slope reinforced with piles[J].Soils and Foundations,2000,40(1):73-84.
[8]张建华,谢强,张照秀.抗滑桩结构的土拱效应及其数值模拟[J].岩石力学与工程学报,2004,23(4):699-703.ZHANG Jian-hua,XIE Qiang,ZHANG Zhao-xiu.Arching effect of anti-slide pile structure and its numerical simulation[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(4):699-703.(in Chinese)
[9]Won J,You K,Jeong S,et al.Coupled effects in stability analysis of pile-slope systems[J].Computers and Geotechnics,2005,32(8):304-315.
[10]Wei W B,Cheng Y M.Strength reduction analysis for slope reinforced with one row of piles[J].Computers and Geotechnics,2009,36(7):1176-1185.
[11]高长胜,陈生水,杨守华,等.基于强度折减有限单元法的抗滑桩加固边坡特性分析[J].水利与建筑工程学报,2010,8(4):119-122.GAO Chang-sheng,CHEN Sheng-shui,YANG Shou-hua,et al.Analysis for slope stability reinforced with anti-slide piles based on strength reduction method with 3D FEM[J].Journal of Water Resources and Architectural Engineering,2010,8(4):119-122.(in Chinese)
[12]Liang R,Zeng S.Numerical study of soil arching mechanism in drilled shafts for slope stabilization[J].Soils and Foundations,2002,42(2):83-92.
[13]吕庆,孙红月,尚岳全.抗滑桩桩后土拱形状及影响因素[J].哈尔滨工业大学学报,2010,42(4):629-633.LYU Qing,SUN Hong-yue,SHANG Yue-quan.Shape of soil arch behind anti-slide piles and its major influence factors[J].Journal of Harbin Institute of Technology,2010,42(4):629-633.(in Chinese)
[14]赵明华,廖彬彬,刘思思.基于拱效应的边坡抗滑桩桩间距计算[J].岩土力学,2010,31(4):1211-1216.ZHAO Ming-hua,LIAO Bin-bin,LIU Si-si.Calculation of anti-slide piles spacing based on soil arching effect[J].Rock and Soil Mechanics,2010,31(4):1211-1216.(in Chinese)
[15]Terzaghi K.Theoretical Soil Mechanics[M].New York:John Wiley and Sons,1943.
[16]Imbsen and Associates,Inc.XTRACT Ver.3.0.3[Z].Sacramento:Imbsen and Associates,Inc.,2000.
[17]中华人民共和国建设部.GB 50010—2002混凝土结构设计规范[S].北京:中国建筑工业出版社,2002.The Ministry of Construction of the People′s Republic of China.GB 50010—2002 Design of Concrete Structures[S].Beijing:China Building Industry Press,2002.(in Chinese)
[18]中华人民共和国住房和城乡建设部.JGJ 94—2008建筑桩基技术规范[S]北京:中国建筑工业出版社,2008.The Ministry of Housing and Urban-Rural Construction of the People′s Republic of China.JGJ94—2008 Building Pile Technical Specifications[S].Beijing:China Building Industry Press,2008.(in Chinese)
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