Journal
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
Volume 22, Issue 7, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0219455422500444
Keywords
Torsional vibration; transversely isotropic; construction disturbance effect; saturated soil; frequency domain; time domain
Categories
Funding
- National Natural Science Foundation of China [51778485]
- Scientic Research Project of Shanghai Science and Technology Commission [19DZ1201004]
- Shanghai Municipal Science and Technology Major Project [2021SHZDZX0100]
- Fundamental Research Funds for the Central Universities, the People's Republic of China
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In this study, the torsional dynamic response of a pile embedded in transversely isotropic saturated soil is investigated, considering the construction of disturbance effect. The dynamic governing equations of soil are established based on Biot's poroelastic theory. Closed-form and quasi-analytical solutions for the torsional dynamic response and velocity response of the pile are derived. The proposed analytical solution is verified by comparison with existing solutions, and a parameter study is conducted to analyze the influence on the complex impedance, twist angle, and torque of the pile.
The torsional dynamic response of a pile embedded in transversely isotropic saturated soil is investigated while allowing for the construction of disturbance effect. The dynamic governing equations of soil are established based on Biot's poroelastic theory. By virtue of the continuous conditions of stress and displacement of adjacent disturbance circle and the boundary conditions of pile-soil coupling system, the circumferential displacement of soil and the shear stress on pile-soil contact surface are derived. Subsequently, a closed-form solution for the torsional dynamic response of a pile is derived in the frequency domain. By using inverse Fourier transform and the convolution theorem, a quasi-analytical solution for the velocity response of the pile head subjected to a semi-sine excitation torque is derived in the time domain. The proposed analytical solution is verified by comparing with the two existing solutions available in literature. Following the present solution, a parameter study is undertaken to portray the influence on the complex impedance, twist angle and torque of pile.
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