Radial explosion strain and its fracture effect from confined explosion with charge of cyclonite
- 45 Downloads
Instrumented experiments were conducted in concrete models to study the explosion-induced radial strain and fracture effect of rock-like media under confined explosion with a charge of cyclonite. As a charge was exploded, two different radial strain waves were sequentially recorded by a strain gage at a distance of 80 mm from the center of charge. Through the attenuation formula of the maximum compressive strain(ɛmax), the distribution of ɛmax and its strain rate(ɛ) between the charge and gage were obtained. The effect of the two waves propagating outwards on the radial fracture of surrounding media was discussed. The results show that the two waves are pertinent to the loading of shock energy (Es) and bubble energy (Eb) against concrete surrounding charge, respectively. The former wave lasts for much shorter time than the latter. The peak values of ɛrmax and ɛ of the former are higher than those of the latter, respectively.
Key wordsconfined explosion loading radial strain radial fracture concrete shock energy bubble energy
Unable to display preview. Download preview PDF.
- Fourney W L, Barker D B, Hollway D C. Fragmentation in join rock material[A]. Proc 1st Int Symp on Rock Fragmentation by Blasting (Vol II) [C]. Sweden: Lulea University of Technology Press, 1983. 505–531.Google Scholar
- Bjartholt G, Skalare H. Instrumented model scale blasting in concrete[A]. Proc 1st Int Symp on Rock Fragmentation by Blasting (Vol II)[C]. Sweden: Lulea University of Technology Press, 1983. 799–814.Google Scholar
- ZHOU Jia-han. Measurement and analysis of velocity of particles in soil by spherical charge [A]. Proc 4th Chinese Symp on Eng Blasting[C]. Beijing: Metallurgical Industry Press, 1993. 52–58. (in Chinese)Google Scholar
- ZHANG Feng-guo, LI En-zheng. A computational model for concrete subjected to large strains, high strain rates, and high pressures[J]. Explosion and Shock Waves, 2002, 22(3): 198–202. (in Chinese)Google Scholar
- Munjiza A, Latham J P, Andrews K R F. Challenges of a coupled combined finite-discrete element approach to explosive induced rock fragmentation[J]. International Journal for Blasting and Fragmentation, 1999, 3(3): 237–250.Google Scholar
- Dick R D, Fourney W L, Wang X J. Results from instrumented small scale model tests[A]. Rock Fragmentation by Blasting [C]. Balkema, Rotterdam, 1993. 47–54.Google Scholar
- XU Guo-yuan. The Investigation on the Breakage Behavior Mechanism in Hard Rock Blasting[D]. Changsha: Central South University of Technology, 1995. (in Chinese)Google Scholar
- GUO Wen-zhang, WANG Shu-ren, ZHANG Qi. Fracture law analysis of explosion in jointed rock formation[J]. Journal of Vibration and Shock, 1999, 18(2): 30–34. (in Chinese)Google Scholar
- Henrych J. The Dynamics of Explosions and its Use [M]. Translator: XIONG Jian-guo. Beijing: Science Press, 1987. 198–199. (in Chinese)Google Scholar
- Persson P A, Holmberg R, Lee J. Rock Blasting and Explosives Engineering [M]. Boca Raton: CRC Press, 1994. 125–126.Google Scholar
- XU Guo-yuan, GU De-sheng. Experimental investigation on generation mechanism of explosive stress waves[J]. Trans Nonferrous Met Soc China, 1999, 9(2): 433–436.Google Scholar