波列振幅PS曲线测桩法
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摘要
叙述一种新的大应变检测单桩竖向承载力的方法 .用重锤或小型火箭筒冲击桩顶 ,用检波器记录振波图 .引入应变 (变形力 )的高次项 ,从理论上证明当为大位移大应变 ,即桩相对于土体产生整体滑动时 ,位移、速度和加速度则不能经过简单积分加速度和微分速度得到 ,即它们为非线性关系 .由此导出 :通过波列振幅计算力 (P)和位移 (S) ,并作 (动态 )P S曲线、确定屈服点 ,进而阐述确定单桩竖向承载力的方法 ,并利用静载荷试验检验动测结果和确定动静P(Q) S曲线的相关常数 .
A new method of detecting the vertical bearing capacity for single-pile with big strain is discussed in this paper. A heavy hammer or a small type of rocket is used to strike the pile top and the detectors are used to record vibration graphs. An expression of higher degree of strain (deformation force) is introduced. It is testified theoretically that the displacement, velocity and acceleration cannot be obtained by simple integral acceleration and differential velocity when big displacement and big strain exist, namely when the pile phase generates a whole slip relative to the soil body. That is to say that there are non-linear relations between them. It is educed accordingly that the force P and displacement S are calculated from the amplitude of wave train and (dynamic) P-S curve is drew so as to determine the yield points. Further, a method of determining the vertical bearing capacity for single-pile is discussed. A static load test is utilized to check the result of dynamic test and determine the correlative constants of dynamic-static P(Q)-S curve.
A new method of detecting the vertical bearing capacity for single-pile with big strain is discussed in this paper. A heavy hammer or a small type of rocket is used to strike the pile top and the detectors are used to record vibration graphs. An expression of higher degree of strain (deformation force) is introduced. It is testified theoretically that the displacement, velocity and acceleration cannot be obtained by simple integral acceleration and differential velocity when big displacement and big strain exist, namely when the pile phase generates a whole slip relative to the soil body. That is to say that there are non-linear relations between them. It is educed accordingly that the force P and displacement S are calculated from the amplitude of wave train and (dynamic) P-S curve is drew so as to determine the yield points. Further, a method of determining the vertical bearing capacity for single-pile is discussed. A static load test is utilized to check the result of dynamic test and determine the correlative constants of dynamic-static P(Q)-S curve.
引文
徐攸在,刘兴满.1989.桩的动测新技术[M].北京:中国建筑工业出版社,188～199,258～336
许昭永,段永康,王彬,等.2004.单次冲击能量及P S曲线测桩法[J].地震学报,26增刊:131～140
中国建筑科学研究院.1991.锤击贯入试桩法规程(CECS 35:91)[A].见:刘金砺主编.桩基工程检测技术[M].北京:中国建筑工业出版社,293～310
BromsBB ,ChooLP .1988.Asimpledrivingformulabasedonstress wavemeasurements[A].In:Proc3rdInternationalConferenceonApplicationofStress waveTheorytoPiles[C].Ottgwa:CanadaPress,826～841
FelleniusBH .1988.VariationofCAPWAPresultsasafunctionoftheoperator[A].In:Proc3rdInternationalConferenceonApplicationofStress waveTheorytoPiles[C].Ottawa:CanadaPress,814～825
RauscheF ,GobleGG ,LikinsE .1985.Dynamicdeterminationofpilecapacity[J].JGeotechnicalEngineering,ASCE ,111(3):367～383
许昭永,段永康,王彬,等.2004.单次冲击能量及P S曲线测桩法[J].地震学报,26增刊:131～140
中国建筑科学研究院.1991.锤击贯入试桩法规程(CECS 35:91)[A].见:刘金砺主编.桩基工程检测技术[M].北京:中国建筑工业出版社,293～310
BromsBB ,ChooLP .1988.Asimpledrivingformulabasedonstress wavemeasurements[A].In:Proc3rdInternationalConferenceonApplicationofStress waveTheorytoPiles[C].Ottgwa:CanadaPress,826～841
FelleniusBH .1988.VariationofCAPWAPresultsasafunctionoftheoperator[A].In:Proc3rdInternationalConferenceonApplicationofStress waveTheorytoPiles[C].Ottawa:CanadaPress,814～825
RauscheF ,GobleGG ,LikinsE .1985.Dynamicdeterminationofpilecapacity[J].JGeotechnicalEngineering,ASCE ,111(3):367～383
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