液压高频振动沉桩的饱和土超静孔压及单桩静载特性试验研究.pdfVIP

第33卷 第2期 岩 土 工 程 学 报 Vol.33 No.2 2011年 .2月 Chinese Journal of Geotechnical Engineering Feb. 2011 液压高频振动沉桩的饱和土超静孔压及单桩静载 特性试验研究 邓俊杰，陈龙珠，邢爱国，宋春雨 (上海交通大学船建学院安全与防灾工程研究所，上海 200240) 摘 要：为解决常规锤击、电动中低频振动法进行桩基施工时引起较为严重的噪声、振动和增大电网负荷等问题，发 达国家已在应用液压高频振动施工技术，但沉桩的土动力学机理以及单桩静力荷载–沉降特性等尚缺乏深入的室内外 试验研究。利用大吨位液压高频振动锤，在某深厚饱和软土场地对直径 500 mm、长度26～29 m 的预应力管桩进行了 沉桩施工试验，观测了邻近地基土超静孔压随沉桩深度而上升及其后续消散的过程；在休止期满后进行了单桩竖向静 载荷试验，并将实测极限承载力与其它常规施工方法的进行了比较分析。试验结果对推广应用液压高频振动沉桩新技 术，具有重要的学术和应用参考价值。 关键词：饱和地基；预制桩施工；液压高频振动锤；超静孔隙水压力；单桩静载荷试验 中图分类号：TU473.1 文献标识码：A 文章编号：1000 –4548(2011)02 –0203 –06 作者简介：邓俊杰(1983 – ) ，女，博士研究生，主要从事岩土工程研究。E-mail: dengjunjiedodo@163.com 。 Experimental studies on pore pressure of saturated soils and bearing capacity of piles driven by high-frequency hydraulic vibrator DENG Jun-jie, CHEN Long-zhu, XING Ai-guo, SONG Chun-yu (Institute of Engineering Safety and Disaster Prevention, Dept. of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China) Abstract: To solve the serious noise and vibration problems as well as the high pressure on the capacity of city power supply caused by the existing piling methods with falling hammers and low-frequency electric vibrators, a new piling technique using high-frequency hydraulic vibrators has been used in some developed european countries and the USA. The piling mechanism related to soil dynamics at high frequency and the bearing capacity of piles after installation with the hydraulic vibrators should be investigated in laboratory and construction sites. U