Modelling of Penetration Resistance and Static Capacity of Piles Driven by Vibration (REU Supplement)

本研究以地基贯入反应及桩的静力特性为基础，探讨利用振动过程预测桩之工作性状。人们之所以对这个问题感兴趣，是因为与冲击锤相比，振动打击机的使用可以显著提高桩在某些土壤中的安装率，对桩的破坏较小，但由于无法获得实用的预测模型，这一使用受到限制。拟议的项目将扩展一项正在进行的实验研究，重点是对振动安装桩的基本机制进行系统评估，并将这些信息编码到为微型计算机编写的计算机程序中。该计算机程序将预测砂土中安装振动器桩的行为和静态能力，并允许从业者研究问题变量对打桩的影响。随着这项研究提供的对桩性能的可预测性的信心增加，预计在地下条件合适的情况下，将有更多的桩通过振动驱动，从而节省大量资金。

This study addresses the predictability of pile behavior installed by vibration process, using ground penetration response and static performance of piles. Interest in this problem is motivated by the fact that the use of vibratory drivers can significantly increase the rate at which piles can be installed in certain soils relative to impact hammers, with less damage to piles, but that use in restricted by the unavailability of a utilitarian predictive model. The proposed project will extend an ongoing experimental study to focus on a systematic evaluation of the fundamental mechanism of the installation of piles by vibration and to code that information in a computer program, written for the microcomputer. The computer program will predict the behavior and static capacity of vibrator- installed piles in sands and allow practitioners to study the effects of the variables of the problem on driving. With increased confidence in the predictability of pile performance offered by this study, it is envisaged more piles at substantial savings will be driven by vibration where subsurface conditions are appropriate.