Influence of Roadway Cross-Section Shape on Gas Explosion Shock Wave Law in U-Type Ventilation Working Faces

Table 1

Parameters of each monitoring point.

Monitoring point	Point 1#	Point 2#	Point 3#	Point 4#	Point 5#	Point 6#	Point 7#	Point 8#	Point 9#
Peak overpressure (MPa)	0.370	0.287	0.245	0.224	0.199	0.176	0.149	0.131	0.109
Peak time (s)	0.018	0.033	0.050	0.067	0.087	0.103	0.122	0.142	0.162
Peak value difference (MPa)		0.083	0.042	0.021	0.025	0.023	0.027	0.018	0.022
Attenuation coefficient K		0.224	0.338	0.395	0.462	0.524	0.597	0.646	0.705

Note: (1) the peak value difference is the overpressure peak value difference between adjacent measuring points and (2) attenuation coefficient K is the reduction rate of each measuring point relative to measuring point 1#.