High-strain dynamic model of large-diameter pipe piles with soil plug for vertical vibration analysis  

作　　者：Yuan Tu M.H.El Naggar Kuihua Wang Wenbing Wu Minjie Wen 

机构地区：[1]School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou,310018,China [2]Geotechnical Research Centre,Department of Civil and Environmental Engineering,Western University,London,Ontario,N6A 3K7,Canada [3]Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou,310058,China [4]Engineering Research Center of Rock-Soil Drilling Excavation and Protection,Ministry of Education,China University of Geosciences,Wuhan,430074,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第11期4440-4461,共22页岩石力学与岩土工程学报（英文）

基　　金：support from the Exploring Youth Project of Zhejiang Natural Science Foundation (Grant No.LQ24E080009);the Key Project of Natural Science Foundation of Zhejiang Province (Grant No.LXZ22E080001);the National Natural Science Foundation of China (Grant No.52108347).

摘　　要：A rigorous analytical model is developed for simulating the vibration behaviors of large-diameter openended pipe piles(OEPPs)and surrounding soil undergoing high-strain impact loading.To describe the soil behavior,the soil along pile shaft is divided into slip and nonslip zones and the base soil is modeled as a fictitious-soil pile(FSP)to account for the wave propagation in the soil.True soil properties are adopted and slippage at the pile-soil interface is considered,allowing realistic representation of largediameter OEPP mechanics.The developed model is validated by comparing with conventional models and finite element method(FEM).It is further used to successfully simulate and interpret the behaviors of a steel OEPP during the offshore field test.It is found that the variation in the vertical vibrations of shaft soil along radial direction is significant for large-diameter OEPPs,and the velocity amplitudes of the internal and external soil attenuate following different patterns.The shaft soil motion may not attenuate with depth due to the soil slippage,while the wave attenuation at base soil indicates an influence depth,with a faster attenuation rate than that in the pile.The findings from the current study should aid in simulating the vibration behaviors of large-diameter OEPP-soil system under high-strain dynamic loading.

关 键 词：Fictitious-soil pile Large-diameter pipe piles Soil plug Pile vibration Elastic wave propagation High-strain dynamic analysis 

分 类 号：TU473.1[建筑科学—结构工程]