Numerical simulation method of tunnel crossing active faults based on discrete element-finite difference coupling

Abstract

This invention relates to the field of underground tunnel engineering technology, and discloses a numerical simulation method for tunnels crossing active faults based on discrete element-finite difference coupling. This method addresses the problem that existing numerical simulation methods for tunnels crossing active faults cannot simultaneously simulate the realistic block geometry of rock masses in active fault zones while maintaining computational efficiency. The invention first generates an active fault block model that conforms to the statistical distribution patterns of actual engineering projects using Neper software. This model is then imported into 3DEC software, where the entire process of modeling, mesh generation, parameter assignment, excavation and support simulation, and active fault creep / stick-slip motion simulation is completed. This avoids the cross-software data transfer issues of traditional coupling methods. Simultaneously, through refined block design, mesh generation, contact settings, and constitutive model matching, the true geological and mechanical properties of the rock masses in active fault zones are fully reproduced. This achieves high-precision numerical simulation of tunnels crossing active faults while maintaining computational efficiency.

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