期刊
COMPUTERS AND GEOTECHNICS
卷 126, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2020.103730
关键词
Pipe pile; Soil mass; Apparent wave velocity; Pile impedance; Natural frequency
类别
资金
- National Natural Science Foundation of China [51678547, 51878634, 51878185, 41867034]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- Fundamental Research Founds for National University, China University of Geosciences (Wuhan) [CUGGC09, 1910491T04]
- Innovative Research Team Program of Guangxi Natural Science Foundation [2016GXNSFGA380008]
- China Postdoctoral Science Foundation [2020M673093]
- MOE Engineering Research Center of Rock-Soil Drilling & Excavation and Protection, Ministry of Education [202012]
- China Scholarship Council (CSC) [201906660001]
- Guangxi Key Laboratory of Disaster Prevention and Structural Safety [2019ZDK047, 2019ZDK049]
A new soil-pile interaction model, called 'additional soil model', is developed to investigate the influence of soil mass on the dynamic characteristics of pipe piles. The soil is divided into an inner region in the immediate vicinity of the pile and an outer region at greater distance. The soil in the inner region is assumed to be an additional mass to participate with the vibration of the pile. The viscous damping at the soil-pile interface and the radiation damping in the soil are calculated separately. An analytical solution for the vertical dynamic characteristics of pipe piles is derived based on the developed soil model. The rationality and accuracy of the additional soil model have been validated through comparison of theoretical predictions and measured driving stress waves of two full-scale steel pipe piles. The approach makes a useful improvement of soil-pile interaction modeling for dynamic applications. The main conclusions of this study include: 1) both the soil plug and the pile surrounding soil can lead to a decrease of apparent wave velocity of pipe piles; 2) the pile impedance will be underestimated if calculated without the consideration of soil mass; 3) the resonant amplitude and natural frequency of piles will be significantly overestimated if the soil mass is ignored.
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