Numerical Simulation of Tunnel Gas Explosion and Structural Damage Analysis Based on ANSYS/LS-DYNA

To investigate the damage and destruction caused by gas explosion shock waves to the wall structures of a roadway, the physical and mathematical models of gas explosion in roadways were established using ANSYS/LS-DYNA to conduct a numerical simulation study on the destructive characteristics of gas explosion shock waves in excavation roadways. The results indicate that the Excess pressure measurements are higher at the edge and center positions of the roadway wall, resulting in relatively more severe damage to the wall. The shock waves also exhibit reflection and superposition on the axial wall of the roadway, leading to fluctuations in the overall Excess pressure peak. After the gas explosion, the shock waves propagate towards the opening direction, with the maximum load applied to the wall in the gas zone, gradually spreading to the air zone. As the energy of the explosion shock waves decays, the stress continues to be applied to the wall structure, with concentrated pressure exerting static damage to the wall structure. Ultimately, the damage exceeds the structure's bearing capacity, resulting in the instability and destruction of the roadway. These research findings provide theoretical references for optimizing the design of roadway structures.