›› 2013, Vol. 34 ›› Issue (9): 2727-2732.

• Numerical Analysis • Previous Articles     Next Articles

Formation of stress containment cage and its relation with explosive yield for strong explosion in granite

WANG Hai-bing1, 2，ZHANG Jian-xin2，TIAN Zhou2，ZHANG Hai-bo2，OU Zhuo-cheng1，ZHOU Gang2   

  1. 1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China; 2. Northwest Institute of Nuclear Technology, Xi’an 710024, China
  • Received:2013-05-30 Online:2013-09-11 Published:2013-09-13

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Abstract: Based on the theory of stress containment cage, the effects of stress containment cage of underground strong blast in granite are studied by numerical simulation. A numerically simulated example of strong explosion with yield of 100 t TNT demonstrated the phenomena of cavity rebound and the dynamic formation process of stress containment cage. The relationships between radial stress and hoop stress with distance from explosive point after the formation of stable stress containment cage are given. The relationships between the size of stress containment cage and the formation time with serial explosive yields are analyzed. Numerical results indicate that: cavity begins to rebound and the stress containment cage begins to form when the cavity radius expending to maximum; stable cavity and stable stress containment cage are formed when the progress of cavity rebound ended; the bigger of explosive yield is, the larger of the formed stress containment cage region is; stress containment cage could not form when the explosive yield is lower than 10 t TNT.

Key words: underground explosion, stress containment cage, explosive yield, granite, numerical simulation

CLC Number: 

  • O 383.1
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