Design Charts for Evaluating Impact Forces on Dissipative Granular Soil Cushions
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 136, Issue 11
Abstract
This paper concerns the problem of designing standard artificial tunnels for rock boulder protection. The proposed approach consists in uncoupling the problem of the dynamic response of the granular dissipative soil cushion placed on the top of artificial tunnels from the dynamic response of the reinforced concrete structure underneath. An already conceived elasto-viscoplastic constitutive model capable of simulating the penetration process of the boulder within the soil stratum and reproducing the force acting on the boulder is briefly described. Its simplified one-dimensional formulation is outlined. A modified version of the model, taking into account large displacements occurring when either impacts on loose granular soils or high energetic content impacts on dense sand strata are considered, is also introduced. To validate the approach, some in situ test results are numerically simulated. A simplified numerical approach is proposed for obtaining the evolution with time of both impact force and boulder penetration, bypassing the use of the rheological model. This goal is achieved by introducing some abaci obtained numerically with reference to an ideal dense sand soil stratum of reference.
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Acknowledgments
The writers gratefully acknowledge Sandro D’Agostini for having stimulated the writers in conceiving a user-friendly approach for designing artificial galleries for rock fall protection, Marco Secondi for his useful suggestions, and the Veneto Strade Company for the financial support.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 136 • Issue 11 • November 2010
Pages: 1529 - 1541
Copyright
© 2010 ASCE.
History
Received: Jan 25, 2008
Accepted: Mar 30, 2010
Published online: Apr 7, 2010
Published in print: Nov 2010
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