Abstarct: One of the important issues in the design and construction of structures is to observe them against the dynamic loads they are subjected to. One of these dynamic loads, which is non-linear and complex, has explosive loads. In the present era, this issue has become more of a concern for engineers and designers by increasing the terrorist attacks on structures and high-rise buildings that sometimes have a state and political dimension. Occasionally, placing a few kilograms of explosives in sensitive locations can withstand irreparable damage to buildings that carry the main loads of the structure. On the other hand, natural phenomena such as gas explosion or fire can also be easily incorporated into the structure. These are enough reasons to pay more attention to the science of rebuilding structures against different loads on them. Fortunately, with the advent of science and the computer, this issue is on a more rapid pace. In this area, various simulation software such as Abaqus, Ansys, Autodyn, Ls-dyna and others have been obtained. With the help of them, you can try, analyze, and check out the above. This helps reduce costs, more precise, easier, and faster prediction. In this thesis, we examined the impact of explosive loading on underground tunnels. As we know, tunnels, including metro tunnels, underpasses, overpasses, etc., are used in today's world and often contain a large number of them, and, against the type and timing of access to the earth's surface, they are of resistive importance. They are more against different loads. In this thesis, we analyzed the effects of 500, 1000 and 5000 kilograms of TNT at depths of 10, 15 and 20 from ground level ground on a tunnel using data analysis. For modeling, a non-networked SPH solver is used. After analyzing pressure, tension and displacement diagrams for each mode, they are compared. The results of the comparison of these graphs showed that the explosion has exploded with mass and inverted with explosive depth.