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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。
In order to solve the problems of conventional hammering and electric medium-low frequency vibrating method to cause more serious noise, vibration and load on the power grid during pile foundation construction, developed countries have applied hydraulic high-frequency vibration construction technology, but soil dynamics Mechanism and single pile static load - settlement characteristics still lack of in-depth indoor and outdoor experimental study. The large-tonnage hydraulic high-frequency vibratory hammer was used to test the pile-sinking construction of prestressed tubular piles with diameter of 500 mm and length of 26 ~ 29 m in a deep saturated soft soil site. Depth and rising and the subsequent dissipation process. After the expiry of the quiescence, the vertical static load test of single pile was carried out, and the measured ultimate bearing capacity was compared with other conventional construction methods. The test results promote the application of new technology of hydraulic high-frequency vibration pile sinking, which has important academic and application reference value.