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This paper introduces the theory of pile foundation with low strain detection , on this basis , according to the one-dimensional wave theory of the pile-soil system response to the qualitative analysis of By modeling pile and soil , according to the pile top speed under the conditions of the pile and soil parameters , and in combination with each kinds of auxiliary information , try to do a quantitative analysis of pile defects . First, starting from the wave equation of the pile-soil system , combined with the boundary and initial conditions , constitute the definite solution of the problem of the pile-soil system under transient excitation . Differential method, using the compiled Matlab calculation procedures solving this definite solution of the problem , the solution was complete piles and a variety of non - complete pile top speed of vibration response , and analysis of the basic characteristics of the dynamic response of the model , and to explore a variety of pile soil parameters on the speed of the response curve . These parameters include the length of the pile , elastic wave velocity of the pile , the pile modulus of elasticity of foundation soil shear wave velocity and Poisson's ratio , pile bottom soil shear wave velocity and Poisson's ratio . And then based on this defect quantitative analysis. Finally, the combination of the actual engineering data , engineering pile fitting analysis , focusing on quantitative analysis of the defect levels , to be more accurate discrimination of pile defect levels , has a certain practical significance .
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