Research on Quantitative Analysis Method for Integrity of Long Screw Drill and Pour PileLU Hai-lin1,LIU Yong1,PENG Shao-min2(1.School of Urban Construction,Yangtze University,Jingzhou 434023,China;2.School of Civil Engineering & Architectural,Wuhan University of Technology,Wuhan 430070,China)The time-domain response model of flaw long screw drill and pour pile was established based on the damped wave equation of pile-soil interaction system.The concept that using the weighted method to make equivalent simplification for soil damping coefficient around pile in layered soil was proposed,the relation between the degree of defect in long screw drill and pour pile and the ratio of amplitude values of incident and reflected waves in the speed response curves was obtained by fitting method,and then realized the quantitative analysis.Model tests were conducted to verify the correctness of the quantitative analysis method.long screw drill and pour pile;defect degree;quantitative analysis;damping coefficient;time-domain response