Journal
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
Volume 43, Issue 9, Pages 1784-1793Publisher
WILEY
DOI: 10.1002/nag.2932
Keywords
dynamic analysis; pile groups; soil-structure interaction
Funding
- National Key Research and Development Program of China [2016YFE0200100]
- National Natural Science Foundation of China [51622803, 51708064]
- Fundamental Research Funds for the Central Universities [106112016CDJXZ208821]
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This paper presents a new analytical model for calculating the steady-state impedance of pile groups subjected to vertical dynamic loads. The derived solution allows considering effects of radially but also vertically propagating soil waves on the soil attenuation function, pile interaction factor, and pile group impedance. The proposed model provides accurate estimates of the soil stress field and of the response of the pile group in the low as well as in the high-frequency range, unlike earlier solutions based on the plane-strain model to describe the soil surrounding the piles, which ignores the vertical soil stress gradient. The latter assumption results in underestimating pile group impedance and overestimating radiation damping for frequencies lower than the cutoff frequencies of the system, which are explicitly captured with the proposed solution.
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