摘要
为了研究多层土中摩擦单桩和群桩的竖向振动特性,开展了一系列的现场竖向桩基动力试验,并建立了多层土中摩擦单桩和群桩的竖向的计算模型,得到了单桩和群桩的动力响应的理论计算方法。通过现场试验得到了竖向动力荷载下的单桩和群桩的位移振动曲线、桩头位移幅值、加速度振动曲线、动刚度和群桩效率系数,分析了群桩在振动过程中相互作用规律。将试验得到的桩头动力刚度、群桩动力效率系数与理论计算方法对比,验证了试验结果的正确性。通过试验结果分析了位移振动曲线、加速度振动曲线、群桩的桩头动力刚度和群桩动力效率系数的变化规律,研究发现:群桩在振动过程中桩与桩之间存在相互作用,导致群桩与单桩的桩头动力刚度不成倍数关系;桩与桩之间作用随着桩间距的增大、桩数的减小而减弱。
To study the vertical vibration characteristics of single and group friction piles in multi-layered soil,a series of field vertical pile foundation dynamic tests are carried out,a vertical calculation model of friction single pile and pile group in multi-layer soils is established and a theoretical calculation method of dynamic response of a single pile and pile groups is obtained.The displacement vibration curves,pile head displacement amplitudes,acceleration vibration curves,dynamic stiffness and group pile efficiency coefficients of a single pile and group piles under vertical dynamic loads are obtained through on-site experiments.The interaction laws of group piles during vibration are also analyzed.The correctness of the experimental results is verified by comparing the dynamic stiffness of pile head and dynamic efficiency coefficient of pile groups obtained from the experiment with the theoretical calculation method.The variation law of displacement vibration curve,acceleration vibration curve,dynamic stiffness of pile head and dynamic efficiency coefficient of pile groups are analyzed through experimental results.The study shows that there are interactions between piles during the vibration process of pile groups,resulting in a non-multiple relationship between dynamic stiffness of pile head of pile groups and a single pile;The interaction between piles weakens as the distance between piles increases and number of piles decreases.
作者
曹小林
周凤玺
戴国亮
梁玉旺
王立业
CAO Xiaolin;ZHOU Fengxi;DAI Guoliang;LIANG Yuwang;WANG Liye(College of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;College of Civil Engineering,Southeast University,Nanjing 211189,China;Sanhe Digital Surveying,Mapping and Geographical Information Technology Co.,Ltd.,Tianshui 741000,China)
出处
《岩土工程学报》
北大核心
2025年第9期1856-1864,共9页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(52408368,51978320)
2024年高校教师创新基金项目(2024A-019)
兰州理工大学红柳优秀青年人才支撑计划项目。
关键词
多层土
竖向振动
桩基础
振动特性
虚土桩法
multilayer soils
vertical vibration
pile foundation
vibration characteristics
dummy soil pile method
