Five kinds of density methane was selected and tested in the horizontal pipeline gas exploding device to research the change rule of the maximum explosion pressure,the maximum rate of pressure rise and the arrival peak time with the methane concentration and propagation distance.

Focuses on the maximal infection number of response time and the relation of between the response time and the maximal infection time.

2) The increase of θ will induce the infection number increaseing in exponent manner, but also result in the increasing of the maximal infection number hmax; 3) it can decrease the maximal infection time tmax.

Purpose: 1 To explore a suitable way to get the peak time and peakvalue of the contrast media reaching the abdominal aorta.

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.