A p-y model for predicting the lateral nonlinear interaction between pile and soil-rock mixture material based on discrete element modeling

Author(s)
W. Sun
Publisher
Elsevier
Source
Simulation Modelling Practice and Theory
Keywords
Discrete element method, Lateral soil resistance, p–y curve, Single pile, soil-rock mixture (S-RM)
Year
2020

To obtain deep insight into and understanding of the mechanical behavior and evolution of the lateral interaction between a single pile and soil-rock mixture material (S/RM), parametric two-dimensional discrete element analyses were performed to investigate the effects of different rock proportions. Adequate numerical simulations for the S/RM were first studied and verified by field direct shear tests. The results demonstrated that the binary discrete numerical models were able to capture the relative shear stress-displacement behavior with different rock proportions. Subsequently, the lateral mechanical behavior, as well as the microstructural evolution law, between the pile and S/RM was studied based on the two-dimensional DEM model. The effects of rock block proportion and size on the p-y curves of the single pile in the S/RM were investigated according to micromechanism analyses. Based on the modified initial modulus of the subgrade reaction and the ultimate resistance that can take into account different rock block contents, a new p-y model is proposed for the prediction of static laterally loaded pile response in S/RM.

Keywords: Soil-rock mixture (S/RM), P-y curve, Single pile, Lateral soil resistance, Discrete element method

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