《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“粘土地基中打桩试验研究I”

作者：Kam W. Ng; Matthew Roling; Sherif S. AbdelSalam; Muhannad T. Suleiman; and Sri Sritharan

刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2013年2月，139卷第2期，199–209页

关键词：桩；荷载试验；粘土；系数；土体固结；抗剪强度；试验

摘要：在粘土中打桩已有存在了几十年，但系统的现场试验研究却很少，系统的试验研究可以为设计方法中分析步骤的发展和完整的打桩过程提供所需要的数据。本文对近期在粘土中打入5个完整的安装实测仪器H型钢桩的现场试验进行了研究总结，此外还配套了一篇讨论打桩方法发展情况的文章对粘土中打桩进行了系统的研究。在研究过程中，详细描述了土质特性，监测了土体横向应力和孔隙水压力，收集了随时间变化的桩的动态重复打击数据以及竖向静力荷载试验数据。重复打击测试表明，在打入的末尾阶段，桩的打入会以一种对数速率出现，并且桩的打入与所测量的孔隙水压力的消散速率相关性很好。基于收集到的现场数据可得出以下结论：桩的侧摩阻力部分在桩的打入过程中起主要作用，且侧摩阻力可以用土质特性进行准确的估计，如固结系数，不排水抗剪强度和标准贯入试验N值。

Pile Setup in Cohesive Soil. I Experimental Investigation

Authors: Kam W. Ng; Matthew Roling; Sherif S. AbdelSalam; Muhannad T. Suleiman; and Sri Sritharan

Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 139, Issue 2 (February 2013), 199–209

Key words: Piles, Load tests, Cohesive soils, Coefficients, Soil consolidation, Shear strength, Experimentation

Abstract: Pile setup in cohesive soils has been a known phenomenon for several decades. However, a systematic field investigation to provide the needed data to develop analytical procedures and integrate pile setup into the design method rarely exists. This paper summarizes a recently completed field investigation on five fully instrumented steel H-piles embedded in cohesive soils, while a companion paper discusses the development of the pile setup method. During the field investigation, detailed soil characterization, monitoring of soil total lateral stress and pore-water pressure, collection of pile dynamic restrike data as a function of time, and vertical static load tests were completed. Restrike measurements confirm that pile setup occurs at a logarithmic rate following the end of driving, and its development correlates well with the rate of dissipation of the measured pore-water pressure. Based on the field data collected, it was concluded that the skin friction component, not the end bearing, contributes predominantly to the setup, which can be accurately estimated for practical purposes using soil properties, such as coefficient of consolidation, undrained shear strength, and the standard penetration test N -value.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000751