Abstract
The impact characteristics of a single pile are the theoretical basis of the high-strain detection technology of piles and pile driving. Firstly, a series of pile model experiments are conducted to study the characteristics of single pile penetration, axial force and friction of the pile under impact loads of different rammer loads and falling distances. Then, the dynamic model of a single pile under impact load under the condition of pile-soil slippage was established by using the elastodynamic method, and the analytical solution of the pile axial force was obtained. The results show that the theoretical solution is in good agreement with the model test results. This shows that the completely bonded model without considering slippage overestimates the frictional resistance between the pile and soil, and the pile-soil slippage model can better simulate the impact of a single pile in sand.
Highlights
The study of the characteristics of foundation piles under impact loads is the theoretical basis for techniques such as pile driving and high strain testing of foundation piles, mainly through field tests or model test methods as well as theoretical analytical methods
To simulate the impact effect of piles, Yan Shuwang et al established a modified static resistance model to carry out the theoretical study of the static resistance model of the soil around the pile and its application in pile driving [5], and Deeks and Randolph established an analytical model of the heavy hammer impact of pile driving [6]
It is important to carry out model tests and theoretical studies on the dynamic response of a single pile under impact loading for an indepth understanding of the pile-earth dynamic interaction
Summary
The study of the characteristics of foundation piles under impact loads is the theoretical basis for techniques such as pile driving and high strain testing of foundation piles, mainly through field tests or model test methods as well as theoretical analytical methods. It has been shown that the fully cohesive model overestimates the pile-soil dynamic interaction [7,8]. It is important to carry out model tests and theoretical studies on the dynamic response of a single pile under impact loading for an indepth understanding of the pile-earth dynamic interaction. The model test method is used to study the impact characteristics of foundation piles in the saturated sandy soil foundation, and the impact theory model of foundation piles is established to verify the reliability of the dynamic model of non-fully cohesive slip piles by solving the vibration control equations and comparing the results of the test results
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