Model Test and Numerical Simulation for Directional Pressure Relief Blasting

Abstract:

To study directional pressure relief blasting, cement mortar model tests are carried out. Protecting borehole wall, free-face wall and bottom wall are tested of the dynamic strain. Three-dimensional numerical simulation and numerical calculation of the tests are conducted by using LS-DYNA3D. The pressure values and test results of the protecting borehole wall, free-face wall and bottom wall with the same distance from the explosives are compared. Development and distribution of pressure regularity are analyzed; blast hole pressure relief effect of protecting borehole wall materials and bottom interval air column are explicated. The present results indicate that there is an obvious stress concentration phenomenon on the free-face wall, with an average pressure decrease rate of 26% from the free-face wall to the protecting borehole wall with the same distance to the explosive center, while the isolation materialPVCU plays a good directional protection. The pressure effect of the blast hole bottom air column on the blast hole is apparent. The simulation results are consistent with the experimental dates.

• Periodical: Advanced Materials Research (Volumes 779-780)
• Pages: 848-856
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.779-780.848
• Online since: September 2013
• Authors: Ding Jun Xiao, Bin Li, Chuan Jin Pu, Hui Qi Zhou
• Keywords: Directional Pressure Relief Blasting, Dynamic Strain Test, Numerical Simulation

References

[1] ZHANG Zhicheng，PU Chuanjin，SHI Jinjin. Study on Rock Damage caused by Smooth Blasting in Different Charging Structure [J]. Blasting. 2006, 23(1): 36-38.

[2] CAI Fuguang. A New Technique of Smooth Blasting[M]. Beijing: China Railway Press, (1994).

[3] ZHANG Zhicheng. Directional Fracture Controlled Blasting[M]. Chongqing: Chongqing University Press, (1997).

[4] ZHANG Zhicheng, WEI Yougui. Application of Protecting Borehole Wall Blasting in Exploiting Allay of Qingping Phosphate Ore [J]. Chemical Mineral and Processing, 2008, (10).

[5] PAN Gongpei，YANG Shuo．Pyroautomatics[M]．Beijing：Beijing Institute of Technology Press，1997.

[6] LI Yiqi，MA Suzhen．Explosion Mechanics [M]．Beijing：Science Press，1992.

[7] ZHANG Guanren，CHEN Danian．Initiation Dynamics of Condensed Explosive[M]．Beijing: National Defense Industry Press，1991.

[8] SHI Dangyong，LI Yuchun，ZHANG Shengmin．Analysis of Displaying Dynamics Based in ansys/ls-dyna8. 1 [M]．Beijing：Tsinghua University Press，2005.

[9] SHANG Xiaojiang，SU Jianyu．ANYSYS/LS－DYNA Dynamic Analysis Method and Engineering Project[M]．Beijing：China Water Power Press，2005.

[10] HallquistJO．LSDYNA Key User's Manual [M]．California：Livermore Software Technology Corporation, 2003.

[11] ZHANG Fengguo，LI En'zheng Calculation Model of Concrete under the condition of Large Strain, High Strain Rate and Pressure Ionization [J]．Explosion and Shock Waves，2002，22（3）：198-202.

[12] Wang Xinghai．Initiatory Discuss of Reasons and Prevention of Mechanical Damage in PVC-U Water-Supplying Pipe [J]．Polyvinyl Chloride，2005，10：23-29.

[13] John O Hallquist. LS-DYNA Theory Manual [M]. California: Livermore Software Technology Corporation, (2006).