Differences between several scholars′ forecasts of peak overpressure have been compared by the con-trastive analysis of research on TNT explosion shock wave spreading in the air.

In order to improve the computation precision of peak overpressure of the blast wave,three point explosion cases are simulated numerically with different fine grids by using the second-order Roe scheme.

As the explosion blast wave overpressure is the governing factor on the tunnel response, a formula was suggested for calculating the blast wave peak overpressure at a certain distance from the detonation center point inside the tunnel.

The damage of shock wave mainly depends on peak overpressure and scaled cube root distance is the most common method to estimate the shock wave overpressure.

The shock wave overpressure and impulse at the same testing point of three explosives were compared.

Influence of length/diameter ratio of explosive charge on in-tunnel blast peak pressure;

The results indicate that: the cavity radius becomes stable at approximately 6000μs;the blasting pressure waves mainly are transmitted horizontally;the peak pressure has a negative logarithm relationship with distance perpendicular to the charging bisector;and the valid influence area r.

The experimental results show that the peak pressure and positive pressure actuation duration by the first drilled explosion on the same measuring points are less th.