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8365614 
Journal Article 
Experimental Study on the Thermal Effect of TNT Explosion in Tunnel 
Zhang, YL; Li, ZR; Zhang, JF; Pan, W; Wang, SQ 
2019 
42 
5 
526-530 
Chinese 
To study the thermal effect of TNT charge that explodes in tunnel, two TNT grains with mass of 1kg and 3kg were detonated in long and straight tunnel. By using WRe 5/26 thermocouple, the response temperature histories at different distances from the explosion center were obtained. The regularity of peak temperature and propagation velocity varying with distance was analyzed, and the effects of charge quantity on peak temperature and its lasting time were also discussed. The results show that due to the secondary reaction of explosive products, there is a hysteretic step in the rising process of response temperature. The peak temperature and the propagation velocity of fireball show a trend of "descending-ascending-descending" with the increase of the distance from explosion center. The ascending section is located in the equivalent diameter section of 8-11 times of tunnel diameter. The maximum propagation velocity of explosive fireball for 1kg TNT charge is achieved in the ascending section with value of 24.69m/s, and the minimum speed with value of 4. 88m/s is achieved in the last section. The peak response temperatures of 1kg TNT and 3kg TNT are 406℃ and 575℃, respectively, and the average duration time of response temperature above zero are 2.20s and 3.30s, respectively. Under the experimental conditions, the ratio of the peak temperature and duration time of 1 kg TNT to 3kg TNT at the same position are approximately equal to the ratio of cubic roots of the two charge masses. © 2019, Editorial Board of Journal of Explosives & Propellants. All right reserved. 
Explosion fireball; Explosion in tunnel; Explosion mechanics; Response temperature; Thermocouple