PL EN
Experimental Study on Radial Decoupling Charge Blasting with Air and Water
Deqiang Yang 1,   Huaming An 2  
,   Zhen Lei 3
 
More details
Hide details
1
Civil and Resource Engineering School, University of Science and Technology Beijing, Beijing, 100083, China
2
Kunming University of Science and Technology, Kunming, 650093, China
3
Guizhou Institute of Technology, Guiyang, 550003, China
CORRESPONDING AUTHOR
Huaming An   

Kunming University of Science and Technology, Kunming, 650093, China
 
Mining Science 2020;27:265–281
 
KEYWORDS
TOPICS
ABSTRACT
In order to investigate the effects of different medium on the initial impact pressure and fragmentation of the hole wall under radial decoupling charge, this paper analyzes and compares the initial impact pressure of hole wall and the size of blasting lumpiness theoretically when air and water are used as coupling medium. Combined with blasting model test, strain datas are collected by high-speed multi-channel dynamic stress testing system, and the lumpiness of model test is sieved and measured. The blasting lumpiness is analyzed by G-G-S distribution function. The results show that compared with the air radial decoupling charge, the water radial decoupling charge has higher blasting peak pressure and more uniform lumpiness. According to the relation between peak strain pressure and decoupling coefficient, the optimal decoupling coefficients of air and water are 1.71 and 1.67 respectively. The results show that the best blasting effect can be achieved by using small hole diameter of water-decoupling charge compared with air-decoupling charge. When the decoupling coefficient is 1.50, the three evaluation indexes of and of blasting lumpiness in water-decoupling medium and boulder yield are minimum, and only two evaluation indexes of lumpiness and are minimum in air-decoupling medium. Applying the test results to the smooth blasting of cutting has certain guiding significance for improving the blasting effect.
 
REFERENCES (18)
1.
ZONG Q., MENG E.J., 2003, Influence of different kinds of hole charging structure on explosion energy transmission, Chinese Journal of Rock Mechanics and Engineering, Vol. 22, No. 4, 643–644.
 
2.
ZONG Q., LI Y.C., XU Y., 2004, Preliminary discussion on shock pressure on hole wall when water-couple charge blasting in the hole, Journal of Hydrodynanamics, Vol. 19, No. 5, 610–615.
 
3.
ZONG Q., TIAN L., WANG H.B., 2012, Study and application on rock damage range by blasting with water-decoupled charge, Blasting, Vol. 29, No. 2, 42–46.
 
4.
DAI J., QIAN Q.H., 2008, Control of size of rock fragmentation by blasting, Journal of Liaoning Tech-nical University (Natural Science Edition), Vol. 27, No. 1, 54–56.
 
5.
DU J.L., LUO Y.G., 2003, Study of formation and propagation of shockwave with water-uncouple charge blasting in hole, Rock and Soil Mechanics, No. (S2), 616–618.
 
6.
DU J.L., LUO Q., ZONG Q., 2005, Analysis on preliminary shock pressure on borehole of air-de-coupling charging, Journal of Xi’an University of Science and Technology, Vol. 25, No. 3, 306–310.
 
7.
WAN Y.L., WANG S.R., 2003, Analyse of Impact Pressure About De-Coupling Charge, Blasting, Vol. 18, No. 1, 13–15.
 
8.
LING W.M., 2004, Experimental Research on Explosion Pressure on the Wall of a Borehole in Rock, Mining and Metallurgy, Vol. 13, No. 4, 13–16.
 
9.
YAN G.B., YU Y.L., 2009, Numerical simulation of air and water medium decoupling charge blasting, Engineering Blasting, Vol. 15, No. 4, 13–19.
 
10.
JIANG F.L., LI X.Y., LI G.H. et al., 2015, Modification on calculation formula of rock mass blastability index based on rough set and nonlinear multiple regression, Journal of Safety Science and Technology, Vol. 11, No. 1, 34–39.
 
11.
LIU Y.Q., HE F.M., CHEN Y.Y., 2005, Test and study on blasting crush rate and lump rate distribution, Coal Engineering, Vol. 5, No. 4, 58–59.
 
12.
CAI F., LIU Z.G., 2014, Impact of water decoupling charging on the energy of stress waves generated by blast in the process of deep-hole presplit blast in coal-bed, Journal of Safety Science and Technology, Vol. 10, No. 8, 16–21.
 
13.
YANG X.L., ZHU Y., 1996, Lumpiness problem in coal mining, Coal, Vol. 5, No. 1, 33–35.
 
14.
SUN L., REN Q.F., ZONG Q., 2010, Application of water-decoupled charge in smooth blasting of coal mine rock tunnel, Blasting, Vol. 27, No. 3, 25–28.
 
15.
CHEN Z.B., CHEN Y.Y., 2015, Distribution of rock fragment size in engineering blasting, Safety in Coal Mines, Vol. 46, No. 9, 177–179.
 
16.
HAN B., 2013, Model experimental study and application of deep-hole blasting in hard rock for mine shaft, Huainan, Anhui University of Science and Technology.
 
17.
MA J.J., XIONG Z.Z., DUAN W.D. et al, 2001, Theoretical testing study factors affecting parallel hole cut blasting, Journal of University of Science and Technology (Natural Science Edition), Vol. 24, No. 2, 170–174.
 
18.
ZONG Q., 2004, Tunneling blasting parameters model experiment study on vertical well freezing soil, Hefei, University of Science and Technology China.
 
eISSN:2353-5423
ISSN:2300-9586