3种模式下钻孔灌注桩桩-土剪切特性现场试验研究
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摘要
不同的桩-土剪切模式对桩-土剪切位移量的大小和桩侧摩阻力的发挥有重要影响。对抗压桩、顶拔桩和负摩擦桩等3种模式的6根钻孔灌注桩的剪切特性进行了现场加载试验与长期监测。通过对不同桩型的桩身应变、桩顶位移和桩周土沉降等试验资料的系统分析,建立了"侧阻-位移"曲线确定各模式桩-土剪切位移量和不同深度的极限侧阻力。根据不同桩-土剪切模式极限侧阻力的发挥特征,分析了桩-土相对运动方向、剪切边界约束条件、剪切位移量、加载速率和剪切历时等5个因素对极限侧阻力发挥的不同影响。讨论了利用现场顶拔桩试验结果对桩负摩阻力增大段的极限负摩阻力进行预测的可行性,供同行参考借鉴。
The pile-soil shear modes have significant influences on the displacement of pile-soil shear and the development of pile side resistance. Field experiments and long-term monitoring were carried out to study shear properties of six bored piles under three modes: bearing pile type, uplift pile type and negative friction pile type. The curve of side resistance versus displacement was established by systematically analyzing the pile strain, displacement of the top pile, and pile-soil layered subsidence of different pile types. The established curve was further used to determine the displacement of pile-soil shear in different modes and the ultimate lateral resistance at different depths. According to the characteristics of the ultimate lateral resistance in different modes, its five influence factors were analyzed, including the relative motion direction of pile-soil, shearing boundary constraint, shear displacement, loading rate and shear duration. Meanwhile, we discussed the feasibility of using the in situ testing results of uplift pile to predict the ultimate lateral resistance of negative friction pile in the increasing stage. This study provides useful references for similar projects.
The pile-soil shear modes have significant influences on the displacement of pile-soil shear and the development of pile side resistance. Field experiments and long-term monitoring were carried out to study shear properties of six bored piles under three modes: bearing pile type, uplift pile type and negative friction pile type. The curve of side resistance versus displacement was established by systematically analyzing the pile strain, displacement of the top pile, and pile-soil layered subsidence of different pile types. The established curve was further used to determine the displacement of pile-soil shear in different modes and the ultimate lateral resistance at different depths. According to the characteristics of the ultimate lateral resistance in different modes, its five influence factors were analyzed, including the relative motion direction of pile-soil, shearing boundary constraint, shear displacement, loading rate and shear duration. Meanwhile, we discussed the feasibility of using the in situ testing results of uplift pile to predict the ultimate lateral resistance of negative friction pile in the increasing stage. This study provides useful references for similar projects.
引文
[1]李广信,黄锋,帅志杰.不同加载方式下桩的摩阻力的试验研究[J].工业建筑,1999,29(12):19-21.LI Guang-xin,HUANG Feng,SHUAI Zhi-jie.Test study on influence of loading ways on friction of pile[J].Industrial Construction,1999,29(12):19-21,67.
[2]杜广印,黄锋.抗压与抗拔桩侧阻的研究[J].工程地质学报,2000,8(1):91-93.DU Guang-yin,HUANG Feng.Study on the compressive and tensile capacity of piles[J].Journal of Engineering Geology,2000,8(1):91-93.
[3]聂如松,冷伍明,杨奇,等.桩-土间剪切应力的传递探讨[J].岩土力学,2009,30(3):799-804.NIE Ru-song,LENG Wu-ming,YANG Qi,et al.Discussion of the shear stress between pile and soil[J].Rock and Soil Mechanics,2009,30(3):799-804.
[4]洪毓康,陈强华.钻孔灌注桩的荷载传递性能[J].岩土工程学报,1985,7(5):22-35.HONG Yu-kang,CHEN Qiang-hua.Analysis of load transfer performance of cast-in concrete piles[J].Chinese Journal of Geotechnical Engineering,1985,7(5):22-35.
[5]董金荣,林胜天,戴一鸣.大口径钻孔灌注桩荷载传递性状[J].岩土工程学报,1994,16(6):123-131.DONG Jin-rong,LIN Sheng-tian,DAI Yi-ming.Load transfer behavior of large-diameter bored pile[J].Chinese Journal of Geotechnical Engineering,1994,16(6):123-131.
[6]赵春风,鲁嘉,孙其超,等.大直径深长钻孔灌注桩分层荷载传递特性试验研究[J].岩石力学与工程学报,2009,28(5):1020-1026.ZHAO Chun-feng,LU Jia,SUN Qi-chao,et al.Experimental study of load transmission property of large-diameter bored cast-in-situ deep and long pile in different soil layers[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(5):1020-1026.
[7]CLOUGH G W,DUNAN J M.Finite element analyses of retaining wall behavior[J].Journal of the Soil Mechanics and Foundations Division,1971,97(12):1657-1673.
[8]GOMEZ J E,FILZ G M,EBELING R M.Extended hyperbolic model for sand-to-concrete interfaces[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(11):993-1000.
[9]GOMEZ J E,FILZ G M,EBELING R M,et al.Sand-to-concrete interface response to complex load paths in a large displacement shear box[J].Geotechnical Testing Journal,2008,31(4):358-369.
[10]DESAI C S,DRUMM E C,ZAMAN M M.Cyclic testing and modeling of interfaces[J].Journal of Geotechnical and Geoenvironmental Engineering,1985,111(6):793-815.
[11]YIN Z Z,ZHU H,XU G H.A study of deformation in the interface between soil and concrete[J].Computers and Geotechnics,1995,17(1):75-92.
[12]HU L M,PU J L.Testing and modeling of soil-structure interface[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(8):851-860.
[13]张嘎.粗粒土与结构接触面静动力学特性及弹塑性损伤理论研究[D].北京:清华大学,2002.ZHANG Ga.A new monotonic and cyclic elastoplasticity damage theory for coarse grained soil-structure interface[D].Beijing:Tsinghua University,2002.
[14]张明义,邓安福.桩-土滑动摩擦的试验研究[J].岩土力学,2002,23(2):246-249.ZHANG Ming-yi,DENG An-fu.Experimental study on sliding friction between pile and soil[J].Rock and Soil Mechanics,2002,23(2):246-249.
[15]王伟,卢廷浩,宰金珉,等.土与混凝土接触面反向剪切单剪试验[J].岩土力学,2009,30(5):1303-1306.WANG Wei,LU Ting-hao,ZAI Jin-min,et al.Negative shear test on soil-concrete interface using simple shear apparatus[J].Rock and Soil Mechanics,2009,30(5):1303-1306.
[16]刘俊伟,张明义,俞峰,等.土与PHC管桩界面剪切疲劳退化试验研究[J].岩土工程学报,2013,35(增刊2):1037-1040.LIU Jun-wei,ZHANG Ming-yi,YU Feng,et al.Experimental study on interface shear fatigue between soils and PHC pipe piles[J].Chinese Journal of Geotechnical Engineering,2013,35(Suppl.2):1037-1040.
[17]彭凯,朱俊高,伍小玉,等.不同泥皮粗粒土与结构接触面力学特性实验[J].重庆大学学报(自然科学版),2011,34(1):110-115.PENG Kai,ZHU Jun-gao,WU Xiao-yu,et al.Experiments on influence of slurry kinds on mechanical behavior of interface between gravel and concrete[J].Journal of Chongqing University(Natural Science),2011,34(1):110-115.
[18]马时冬.桩身负摩阻力的现场测试与研究[J].岩土力学,1997,18(1):8-15.MA Shi-dong.Study on negative skin friction along pile shaft with field test[J].Rock and Soil Mechanics,1997,18(1):8-15.
[2]杜广印,黄锋.抗压与抗拔桩侧阻的研究[J].工程地质学报,2000,8(1):91-93.DU Guang-yin,HUANG Feng.Study on the compressive and tensile capacity of piles[J].Journal of Engineering Geology,2000,8(1):91-93.
[3]聂如松,冷伍明,杨奇,等.桩-土间剪切应力的传递探讨[J].岩土力学,2009,30(3):799-804.NIE Ru-song,LENG Wu-ming,YANG Qi,et al.Discussion of the shear stress between pile and soil[J].Rock and Soil Mechanics,2009,30(3):799-804.
[4]洪毓康,陈强华.钻孔灌注桩的荷载传递性能[J].岩土工程学报,1985,7(5):22-35.HONG Yu-kang,CHEN Qiang-hua.Analysis of load transfer performance of cast-in concrete piles[J].Chinese Journal of Geotechnical Engineering,1985,7(5):22-35.
[5]董金荣,林胜天,戴一鸣.大口径钻孔灌注桩荷载传递性状[J].岩土工程学报,1994,16(6):123-131.DONG Jin-rong,LIN Sheng-tian,DAI Yi-ming.Load transfer behavior of large-diameter bored pile[J].Chinese Journal of Geotechnical Engineering,1994,16(6):123-131.
[6]赵春风,鲁嘉,孙其超,等.大直径深长钻孔灌注桩分层荷载传递特性试验研究[J].岩石力学与工程学报,2009,28(5):1020-1026.ZHAO Chun-feng,LU Jia,SUN Qi-chao,et al.Experimental study of load transmission property of large-diameter bored cast-in-situ deep and long pile in different soil layers[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(5):1020-1026.
[7]CLOUGH G W,DUNAN J M.Finite element analyses of retaining wall behavior[J].Journal of the Soil Mechanics and Foundations Division,1971,97(12):1657-1673.
[8]GOMEZ J E,FILZ G M,EBELING R M.Extended hyperbolic model for sand-to-concrete interfaces[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(11):993-1000.
[9]GOMEZ J E,FILZ G M,EBELING R M,et al.Sand-to-concrete interface response to complex load paths in a large displacement shear box[J].Geotechnical Testing Journal,2008,31(4):358-369.
[10]DESAI C S,DRUMM E C,ZAMAN M M.Cyclic testing and modeling of interfaces[J].Journal of Geotechnical and Geoenvironmental Engineering,1985,111(6):793-815.
[11]YIN Z Z,ZHU H,XU G H.A study of deformation in the interface between soil and concrete[J].Computers and Geotechnics,1995,17(1):75-92.
[12]HU L M,PU J L.Testing and modeling of soil-structure interface[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(8):851-860.
[13]张嘎.粗粒土与结构接触面静动力学特性及弹塑性损伤理论研究[D].北京:清华大学,2002.ZHANG Ga.A new monotonic and cyclic elastoplasticity damage theory for coarse grained soil-structure interface[D].Beijing:Tsinghua University,2002.
[14]张明义,邓安福.桩-土滑动摩擦的试验研究[J].岩土力学,2002,23(2):246-249.ZHANG Ming-yi,DENG An-fu.Experimental study on sliding friction between pile and soil[J].Rock and Soil Mechanics,2002,23(2):246-249.
[15]王伟,卢廷浩,宰金珉,等.土与混凝土接触面反向剪切单剪试验[J].岩土力学,2009,30(5):1303-1306.WANG Wei,LU Ting-hao,ZAI Jin-min,et al.Negative shear test on soil-concrete interface using simple shear apparatus[J].Rock and Soil Mechanics,2009,30(5):1303-1306.
[16]刘俊伟,张明义,俞峰,等.土与PHC管桩界面剪切疲劳退化试验研究[J].岩土工程学报,2013,35(增刊2):1037-1040.LIU Jun-wei,ZHANG Ming-yi,YU Feng,et al.Experimental study on interface shear fatigue between soils and PHC pipe piles[J].Chinese Journal of Geotechnical Engineering,2013,35(Suppl.2):1037-1040.
[17]彭凯,朱俊高,伍小玉,等.不同泥皮粗粒土与结构接触面力学特性实验[J].重庆大学学报(自然科学版),2011,34(1):110-115.PENG Kai,ZHU Jun-gao,WU Xiao-yu,et al.Experiments on influence of slurry kinds on mechanical behavior of interface between gravel and concrete[J].Journal of Chongqing University(Natural Science),2011,34(1):110-115.
[18]马时冬.桩身负摩阻力的现场测试与研究[J].岩土力学,1997,18(1):8-15.MA Shi-dong.Study on negative skin friction along pile shaft with field test[J].Rock and Soil Mechanics,1997,18(1):8-15.