【摘要】 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,在时间域中实现基桩存在多缺陷时的低应变动测缺陷量化分析。模型桩试验分析结果表明,采用给出的缺陷量化分析方法可取得显著效果。更多还原

【Abstract】 Through a great deal of calculations,the relationship between defect degree and ratio of amplitude was studied,in which the influence of the characteristics of the soil around piles is considered.By means of theoretical analysis,the influence coefficients of a reduced neck defect or a neck-expanded defect to the next one are derived under the condition that the pile has more defects.The theory and method for determining the defect degree of the pile foundation with more defects are discussed,in which the method of regaining the energy of elastic wave and recurrence formulae are developed.In the time domain,the quantitative analysis of pile with more defects is realized with low-strain dynamic test.Finally,model pile test was performed to prove the accuracy of quantitative analysis theory.更多还原