Dynamic boundary setting for discrete element method considering the seismic problems of rock masses
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The discrete element method (DEM) provides an effective approach to analyse the large deformations and discontinuous problems in geotechnical engineering. In this paper, to improve the capability of DEM for seismic response analysis of rock masses, the problem of boundary setting in DEM is systematically investigated. Three typical dynamic boundary conditions are reviewed and introduced into DEM. Calibration factors are introduced into the equations of the boundary conditions, and an approach is proposed to determine the factors for optimum wave absorption. The procedures for constructing the free-field domain and main-grid domain are proposed. The seismic dynamic input methods are researched, and a static-dynamic unified boundary technique is proposed to enable the consistent boundary transformation. Numerical examples are presented to verify the feasibility and effectiveness of the proposed boundary-setting methods.
KeywordsDiscrete element method Boundary setting Calibration factor Seismic dynamic input Seismic response analysis
We would like to acknowledge the reviewers and the editors for their comments and suggestions. The study was financially supported by the National Basic Research Program of China (No. 2015CB057905), the National Natural Science Foundation of China, (Nos. 51779253, 41672319), and the National Key R&D Program of China (No. 2016YFC0401803).
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Conflict of interest
This article is original. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.
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