Analysis And Research On High-strain Measured Curve Matching Method And Its Pile-soil Parameters

As the most reliable and state-of-art dynamic testing method, measured signal curve matching method has been widely used in practice home and abroad. However, the model of CAPWAPC, which bases on the pile-soil interaction under dynamic impact, actually is a empirical model. And there have many model parameters. In the measured curve matching process, the technicians decide or choose pile-soil parameters by their experience. So the parameters precision lie on their technique and experience, and the ultimate results are usually not precise.Firstly author briefly introduce the traveling wave theory and the rule of stress wave spreading in a pile. And then basing on analizing the base pile-soil interactional model of the curve matching method, discuss the model parameters. Based on detailed analysys of past experiment results, established the relationship between the parameters and the factors of common soil properties in lab, at the same time, Using the rules of the static load testing method and the technical code, the restrictional condition of the soil quake(Q) and soil resistance(Ru) can be established, which reduce the result's multi-answer and random.Author Detailly analyze and study the influence of the pile-soil parameters in allusion to matching curve, attained the range and the trend of the influence.In order to verify these methods, Author collect some comparable dynamic-stastic data, Stat. and analyze the data. Get the limit resistance standard value on pile. Analyze renewedly the dynamic data , and then compare the dynamic result to the stastic test result. The result shows that the renewed dynamic results are more precise, which are close to the static testing result. So the methods match fairly well.Depended on the studied results, author select some representative foundation piles, analysis their dynamic data, summarize the choicen and the action rule of the main matching parameters about these piles. Finally, the out look and advise has been done to the development direction .