时间域中基桩缺陷低应变动测的定量分析

针对瞬态激振条件下均质土中桩存在缺陷的定解问题进行分析 ,研制了正演计算软件。通过大量正演计算 ,对不同桩周土条件下缺陷程度与时域速度响应波形中入射波波幅与反射波波幅的比值进行了相关性分析 ,拟合出桩侧土为黏土、砂土、粉土的地质条件下桩径变化程度与波幅比之间的关系式。通过理论分析 ,对基桩存在多缺陷条件下 ,导出了缩颈与扩颈对下一个缺陷引起的反射波幅值的影响系数 ,进而提出了逐步能量恢复递推缺陷程度的理论与方法 ,在时间域中实现了基桩存在多缺陷时的低应变动测缺陷量化分析

QUANTITATIVE ANALYSIS OF DEFECTS FOR FOUNDATION PILE WITH DEFECT IN TIME DOMAIN WITH LOW STRAIN DYNAMIC TEST

Software for analysis on quantitative solution of defect existing in foundation pile as a result of instantaneous excited tremor was developed to analyze degree of defect in condition of various soil surrounding the pile and relativity of breadth ratio between wave incident and reflected in wave of velocity response in time domain.A relational formula between variational degree of diameter of pile and amplitude ratio was draught up to be fitted close in geologic condition of clay,arenaceous soil,and pulverous soil.The effect coefficient of neck reducing or distending on reflected wave as a result of the next defect was educed,theory and method for recursion of degree of effect by energy stepwise restoring was put forward furthermore,and the quantificational analysis of dynamic test with lower strain for foundation pile with more defects was actualized in time domain.