单缺陷桩反射波法动测曲线峰-峰点反演的精度研究

英文篇名：STUDY OF PEAK-PEAK PRECISION INVERSION FOR REFLECTED WAVE TESTING CURVES OF SINGLE DEFECT PILES
中文刊名：岩石力学与工程学报
英文刊名：Chinese Journal of Rock Mechanics and Engineering
作者：刘东甲 ; 刘煜洲 ; 王杰英
英文作者：Liu Dongjia1 ; Liu Yuzhou1 ; Wang Jieying2 (1Institute of Natural Resources and Environmental Science ; Hefei University of Technology ; Hefei 230009 China) (2Anhui Xinjian Foundation Engineering Co. Ltd. ; Hefei 230022 China)
中文关键词：土力学 ; 反射波法 ; 反演 ; 精度 ; 缺陷临界长度 ; 桩
英文关键词：soil mechanics ; reflected wave method ; inversion ; precision ; critical defect length ; piles
出版日期：2003-08-30
机构：合肥工业大学资源与环境学院,合肥工业大学资源与环境学院,安徽新建基础工程有限公司合肥230009 ,合肥230009 ,合肥230022
年：2003
期：08
出版单位：岩石力学与工程学报

摘要

从理论计算、物理解释和实际资料验证3个方面,研究了由反射波法动测曲线峰-峰点反演桩身缺陷位置的精度问题。结果表明,当桩身波速准确时,峰-峰点反演精度主要由缺陷实际长度与定义的缺陷临界长度的比值决定。若该比值大于或等于1,缺陷反演位置与缺陷实际位置接近;若该比值小于1,缺陷上界面反演深度较浅,下界面反演深度较深。对这种短缺陷的缺陷反演长度变大现象,通过该缺陷上界面反射的上行拉力波与下界面反射的上行压力波的叠加来解释,并由实测资料予以证实。
Based on theoretical calculation,physical interpretation and practical testing data,the precision of inversion of shaft defect locations by peak-peak reflected wave testing curves for single piles is studied. The results indicate that the precision mainly depends on the ratio of the defect length to the critical defect length defined in this paper when the wave velocity in the piles is accurate. If the ratio is more than or equal to 1,the inversion defect locations are close to the true ones. If the ratio is less than 1,the inversion depth of the upper defect surface is shallower,while that of the lower defect surface is deeper. The inversion defect length for piles with short defect becomes larger than real one because of the superimposition of upward tensile wave reflected by the upper surface and upward compressive wave reflected by the lower surface,and this is verified by practical testing data.

引文

1MiddendorpP,ReidingF J.Determination of discontinuities in piles byTNO integrity testing and signal matching technique[A].In:Proceeding of theThirdInternationalConference onApplication ofStressWaveTheory toPiles[C].Rotterdam:A.A.Balkema,1988,33～43
    2刘东甲.完整桩瞬态纵向振动的模拟计算[J].合肥工业大学学报,2000,23(5):683～687
    3RauscheF. Pileinteg ritytes tin gandanal ysi sfor pileintegrity[A].In:P ro c.oftheFourthInternationalConfer enceonApplica tionofStressWaveTh eorytoPiles[C].Rotterdam:A.A.Balkema,1992,613～617
    4刘孝敏,胡时胜,黄理兴.混凝土桩身缺陷的二维数值分析[A].见:王秀喜编.计算力学及在工程中的应用[C].合肥:中国科学技术大学出版社,1992,278～286
    5柴华友,贺怀建,唐念慈.桩土相互作用模型及模型实验[J].岩土力学,1993,14(2):75～84
    6柴华友.基桩定量分析精度影响因素[A].见:刘金励编.桩基工程技术[C].北京:中国建材工业出版社,1996,470～477
    7刘洪兵,王新宇,文立华等.模型桩动力测试与计算分析[A].见:应怀樵编.现代振动与噪声技术[C].北京:航空工业出版社,1997,328 ～330
    8KotenVH, Middendo rp P.Ananalysi sofd issipativew av e propagationinapile[A]. In :Int.Seminaron theApplicationofSt ressWaveTheoryonPiles[C].Rotterdam:A.A.Balkema,1980,210～215
    9刘东甲.不均匀土中多缺陷桩的轴向动力响应[J].岩土工程学报,2000,22(4):391～395
    10刘东甲.桩土系统纵向振动理论及应用[A].见:白以龙,杨卫主编.力学2000[C].北京:气象出版社,2000,309～310
    11刘东甲.纵向振动桩侧壁切应力频率域解及应用[J].岩土工程学报,2001,23(5):544～5 46
    12Lys merJ,Ric ha rtFE.Dy na micrespo nseoffootingtoverticalloading[J ].JournalSoilMechanicsandFoundationDivision,ASCE,1966,92(SM1):65～91
    13王靖涛.桩基应力波检测理论及工程应用[M].北京:地震出版社,1999
    14林苏雄.模型桩动测效果的研究[A].见:刘金励编.桩基工程技术[C].北京:中国建材工业出版社,1996,478～483