A fast and efficient particle packing generation algorithm with controllable gradation for discontinuous deformation analysis

Abstract

A systematic geometric algorithm is developed to generate particle packing with high density, controllable gradation, and uniform spatial distribution for discontinuous deformation analysis (DDA). The algorithm incorporates a lattice searching technique to expedite overlap detection and reduce computational costs during particle packing generation. Additionally, a Fourier transformation method is utilized to analytically handle overlap detections on arbitrary irregular boundaries. To evaluate the efficiency and accuracy of the proposed method, a series of comparisons are made between existing methods and the proposed approach. Numerical modelling of engineering problems is conducted using the proposed method and a self-developed numerical program called DDA. The modelling results demonstrate that the proposed particle generation method has wide applications in generating complex particle models for discontinuous numerical analysis. The algorithm exhibits excellent performance in both geometric and numerical analyses, further confirming its efficiency and accuracy.

Study on Temperature Distribution Law of Tunnel Portal Section in Cold Region Considering Fluid–Structure Interaction

“…According to the direction of numerical simulation, more research data are still needed to provide support for the development of theory. The main numerical simulation methods used for rock mechanics problems are the finite-element method and the discrete-element method [24][25][26][27][28][29][30]. At the same time, it is not difficult to see from the above research that the current mainstream research on the temperature field of tunnels in cold regions involves the study of the temperature distribution under multi-field coupling, which mainly explores the influence of the surrounding rock conditions on the temperature field distribution [11].…”

Study on the Stress Distribution and Stability Control of Surrounding Rock of Reserved Roadway with Hard Roof

“…Feng Wan [4] used roof cutting and pressure relief combined with concrete walls to control the deformation of surrounding rock in the tunnel, and Jianjun Ma [5] used a dynamic load concrete thermoelastoplastic damage coupling model to study the dynamic load effect of concrete. In terms of the numerical simulation of tunnel surrounding rock, Jianjun Ma [6] used a fast particle accumulation generation algorithm with discontinuous deformation and controllable gradient to simulate the mechanical properties of the rock. Regarding the impact of advanced blasting on surrounding rock, Jianjun Ma [7] applied the M-JHB4DLSM model to study the mechanical behavior of tunnels under close-range blasting.…”