大型振动台桩基模型基础动力参数测试  

Testing of Pile Dynamic Parameters Using Large Shaking Table

作　　者：徐磊 周玉明 蔡克俭 XU Lei;ZHOU Yuming;CAI Kejian(Tianjin Institute of Geotechnical Investigation and Survey Co.Ltd.,Tianjin 300191)

机构地区：[1]天津市勘察设计院集团有限公司,天津300191

出　　处：《土工基础》2022年第3期481-485,共5页Soil Engineering and Foundation

摘　　要：桩基动力参数测试,为大型振动台提供了准确、详实的动力参数;采用强迫振动测试方法对模型基础进行了明置、埋置两种方式的竖向、水平向、扭转扰力试验。通过分析试验数据得出桩基模型基础在埋置工况下单桩的抗压刚度、抗剪和抗扭刚度系数、桩基各向的阻尼比、各向的参振总质量等动力参数明显高于明置工况,数据显示桩基模型基础周围的土体也参与了振动,土体的参振质量在动力参数计算中不可忽略,同时也会影响到地基动刚度的计算,土体在质弹阻体系中也充分发挥了作用,便于设计单位进一步深化使用,从而更好的实现大型振动台减隔震的目的。This paper presents extensive and accurate dynamic parameters testing results on model piles by using a large shake table device.The model tests were performed on model pile foundations with exposed and buried pile caps under vertical,lateral and torsional loads by using forced vibration method.The testing results indicated that the compressive,shear and torsional stiffness,damping ratio in various directions and total mass in vibration of single pile with a buried pile cap are obviously higher than that with exposed pile cap.The test data also showed that the soil surrounding the model pile is also involved in the vibration and the mass would affect the foundation stiffness,but the soil mass could be neglected in the dynamic parameter analysis.The role of soil surrounding the pile is also important to the mass and elastic damping system in the seismic vibration reduction by using shaking table.

关 键 词：大型振动台 桩基动力参数测试 强迫振动测试 抗压刚度 阻尼比 参振总质量 

分 类 号：TU411[建筑科学—岩土工程]