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.

The paper pointed out that a gas density, fire location and energy are the important factors to the size and display time of the explosion pressure peak value.

This paper is to realize the characteristics and transmitting rules of underwater drilling blasting shock wave through studying the test data and pressure undulance acquired from small test of underwater drilling blasting in shore,considering the effect of depth to the pressure peak value of shock wave.

The results show that the sympathetic explosion of detonator(depends) on both the shock pressure peak and its duration,and the shock pressure peak is the chief factor.

The conclusion shows that the elastic deformation of stored material and its speed do good to breaking discharing arch and reducing pressure peak.

The purpose of this paper is to examine the calculation method of direct shock wave peak pressure.

Peak pressure has a cubic function with propagation distance,and influence of density impacting on peak pressure is analyzed.