基于单桥静力触探的静压桩沉桩阻力估算方法
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摘要
为了通过单桥静力触探指标比贯入阻力来模拟计算静压桩沉桩阻力,根据《建筑桩基技术规范》(JGJ 94—2008)中由比贯入阻力计算的单桩承载力与现场压桩试验所得到的压桩力进行比较,提出了考虑桩端阻力和桩侧摩阻力的综合修正系数α、β来估算静压桩沉桩阻力的计算方法,给出桩端阻力和桩侧摩阻力的计算公式;针对不同土层,给出了不同综合修正系数建议值;基于自行编制的Visual Basic可视化程序,以曲线的形式将计算结果直观地显示出来。实际工程的模拟计算和压桩力的实测结果进一步表明采用综合修正系数计算沉桩阻力完全可行。
The penetration resistance of jacked pile was calculated by using the specific penetration resistance of single bridge cone penetration test.According to the comparison between estimated bearing capacity from Technical Code for Building Pile Foundation(JGJ 94-2008)and measured value,the calculation method of estimating the penetration resistance of jacked pile was put forward,which took comprehensive correction coefficientαandβof pile tip resistance and skin friction of pile into consideration.Besides,the calculation formula of base resistance and side resistance were also defined.Several suggestions for determination of comprehensive correction coefficient were given for different soil layers.The proposed approach was compiled in the Visual Basic visualization program,and the corresponding results were displayed in the form of graphics.Through the simulation of specific engineering and test results of pile driving pressure,the results further showed that it was feasible to use the comprehensive correction coefficient to calculate the pile resistance.The obtained results could provide guidances for the design and construction of jacked pile under similar condition in engineering practice.
The penetration resistance of jacked pile was calculated by using the specific penetration resistance of single bridge cone penetration test.According to the comparison between estimated bearing capacity from Technical Code for Building Pile Foundation(JGJ 94-2008)and measured value,the calculation method of estimating the penetration resistance of jacked pile was put forward,which took comprehensive correction coefficientαandβof pile tip resistance and skin friction of pile into consideration.Besides,the calculation formula of base resistance and side resistance were also defined.Several suggestions for determination of comprehensive correction coefficient were given for different soil layers.The proposed approach was compiled in the Visual Basic visualization program,and the corresponding results were displayed in the form of graphics.Through the simulation of specific engineering and test results of pile driving pressure,the results further showed that it was feasible to use the comprehensive correction coefficient to calculate the pile resistance.The obtained results could provide guidances for the design and construction of jacked pile under similar condition in engineering practice.
引文
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[17]建筑桩基技术规范:JGJ 94-2008[S].北京:中国建筑工业出版社,2008.Technical code for building pile foundation:JGJ 94-2008[S].Beijing:China Architecture&Building Press,2008.(in Chinese)
[2]LEE J W,KIM M K,KYUNG D Y.Estimation of lateral load capacity of rigid short piles in sands using CPT results[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(1):48-56.
[3]LEE J W,PAIK K H,KIM D H,et al.Estimation of axial load capacity for bored tapered piles using CPTresults in sand[J].Journal of Geotechnical and Geoenvironmental Engineering,2009,135(9):1285-1294.
[4]路家峰,顾国荣,杨石飞.静力触探估算单桩极限承载力计算方法研究[J].建筑结构,2015,45(Sup2):217-220.LU J F,GU G R,YANG S F.Study on ultimate bearing capacity calculation of pile based on static cone penetration test[J].Building Structure,2015,45(Sup2):217-220.(in Chinese)
[5]沈小克,蔡正银,蔡国军.原位测试技术与工程勘察应用[J].土木工程学报,2016,49(2):98-120.SHEN X K,CAI Z Y,CAI G J.Applications of in-situ tests in site characterization and evaluation[J].China Civil Engineering Journal,2016,49(2):98-120.(in Chinese)
[6]马海鹏,陈祖煜,于沭.上海地区土体抗剪强度与静力触探比贯入力相关关系研究[J].岩土力学,2014,35(2):536-542.MA H P,CHEN Z Y,YU S.Correlations of soil shear strength with specific penetration resistance of CPT in Shanghai area[J].Rock and Soil Mechanics,2014,35(2):536-542.(in Chinese)
[7]罗金满,刘伟.静力触探在岩土工程勘察中的应用[J].施工技术,2012,41(Sup):14-18.LUO J M,LIU W.Application of cone penetration test in geotechnical investigation[J].Construction Technology,2012,41(Sup):14-18.(in Chinese)
[8]吴波鸿,王贵和,刘宝林,等.静力触探在渤海某海上平台场址工程中土层划分的应用研究[J].施工技术,2016,45(Sup):915-919.WU B H,WANG G H,LIU B L,et al.Application of CPT on soil classification in a offshore platform project of Bohai sea[J].Construction Technology,2016,45(Sup):915-919.(in Chinese)
[9]MIAO Y H,CAI G J,LIU S Y.Predicting the ultimate bearing capacity of single piles based on CPTU[C]//Advanced Materials Research,2011,243:4402-4407.
[10]ABU-FARSAKH M Y,TITI H H.Assessment of direct cone penetration test methods for predicting the ultimate capacity of friction driven piles[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(9):935-944.
[11]LI Z Z,TANG L S,HU Y Q,et al.A new estimation method for penetration depth of displacement pile based on a new type cone penetration test[C]//Applied Mechanics and Materials,2011,90:234-244.
[12]张明义,刘俊伟,王静静,等.计算静压桩沉桩阻力的综合调节系数法[J].重庆建筑大学学报,2007,29(6):35-38.ZHANG M Y,LIU J W,WANG J J,et al.Adjustingcoefficient method to calculate penetration resistance of jacked piles[J].Journal of Chongqing Jianzhu University,2007,29(6):35-38.(in Chinese)
[13]贾沼霖,闫澍旺,杨爱武,等.静力触探在大直径超长桩溜桩分析中的应用[J].岩石力学与工程学报,2016,35(Sup1):3274-3282.JIA Z L,YAN S W,YANG A W,et al.Application of cone penetration test for the analysis of pile-run of long and large diameter piles in offshore geotechnical engineering[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(Sup1):3274-3282.(in Chinese)
[14]黎志中,李兆源,杨然.三桥静力触探在桩基中的应用研究[J].岩石力学与工程学报,2015,34(4):846-854.LI Z Z,LI Z Y,YANG R.Application of triple-bridge cone penetration test in pile foundation[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(4):846-854.(in Chinese)
[15]SAGASETA C,HOULSBY G T,NORBURY J,et al.Quasi-static undrained expansion of a cylindrical cavity in clay in the presence of shaft friction and anisotropic initial stresses[R].Department of Engineering Science,University of Oxford,1984.
[16]王宗文,尤苏南.静力触探成果在估算单桩承载力方面的应用分析与研究[J].建筑技术,2014,45(Sup):85-89.WANG Z W,YOU S N.Application and analysis of static cone penetration results in estimating bearing capacity of single pile[J].Architecture Technology,2014,45(Sup):85-89.(in Chinese)
[17]建筑桩基技术规范:JGJ 94-2008[S].北京:中国建筑工业出版社,2008.Technical code for building pile foundation:JGJ 94-2008[S].Beijing:China Architecture&Building Press,2008.(in Chinese)