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Static and Dynamic Models for CAPWAP Signal Matching

机译：CAPWAP信号匹配的静态和动态模型

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Signal matching is the preferred analysis method for Dynamic Load Test (DLT) evaluations. It is applicable to DLT records of driven piles, auger-cast piles, drilled shafts, and even on dynamic penetrometers. Although signal matching is considered standard best-practice, required by many code specifications and therefore routinely used on thousands of deep foundation projects worldwide, and of significant importance to the deep foundation industry, many features of the CAPWAP? signal matching model and procedure are not well known.rnCAPWAP's signal matching is possible because of the availability of redundant measurements of load and movement, and it is necessary to determine the unknown boundary conditions. The goal of CAPWAP is the determination of dynamic and static soil resistance parameters of the generally accepted Smith-type pile-soil interface model. However, the classic Smith model cannot explain some of the phenomena that occur during the impact event. For reliable signal matching results, therefore, several modifications of the original Smith model were made. While some modifications fundamentally do not affect the signal match, other more substantial changes are of considerable importance to the reliable determination of the all-important static load bearing capacity result.rnBefore discussing the CAPWAP procedure and its automatic analysis tools, this paper describes the more unusual CAPWAP pile and soil model parameters and their effects on the final results. Measurement and analysis results from actual projects demonstrate the various features of the program and aspects of the models. The paper includes a summary of recommended limits for model parameters, match qualities, and calculation procedures and a few suggestions for additional research.
机译：信号匹配是动态负载测试（DLT）评估的首选分析方法。它适用于驱动桩，螺旋钻桩，钻探井甚至动态渗透仪上的DLT记录。尽管信号匹配被认为是标准的最佳实践，但是许多代码规范都要求信号匹配，因此通常在全球成千上万个深基础项目中使用，并且对深基础行业具有重要意义，CAPWAP的许多功能？信号匹配模型和过程尚不为人所知。CAPWAP的信号匹配是可行的，因为可以进行负载和运动的冗余测量，并且有必要确定未知的边界条件。 CAPWAP的目标是确定普遍接受的Smith型桩土界面模型的动态和静态土壤阻力参数。但是，经典的史密斯模型无法解释撞击事件发生的某些现象。为了获得可靠的信号匹配结果，因此对原始Smith模型进行了一些修改。尽管某些修改从根本上不会影响信号匹配，但其他更重要的更改对于可靠确定所有重要的静态承载力结果也具有重要意义。在讨论CAPWAP程序及其自动分析工具之前，本文将介绍更多CAPWAP桩和土壤模型参数异常及其对最终结果的影响。实际项目的测量和分析结果证明了程序的各种功能以及模型的各个方面。本文总结了模型参数，匹配质量和计算程序的建议极限值，以及一些其他研究建议。

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