Precise calculation method of explosive charge mass in stepped blasting holes on tunnel by drilling and blasting method
At present,the construction technology of tunnel drilling and blasting method is becoming more and more mature,but the precise calculation of the charge mass of the blast hole still lacks reliable experience or theoretical formula.Based on Livingston's blasting crater theory,considering the factors such as hole spacing,row spacing and inclination angle in the design of bench blasting scheme on tunnel,the calculation method of blasting rock volume with inclined and vertical hole burden is proposed.Considering the influence of factors such as rock firmness coefficient and direction of detonation free surface,an optimization calculation method of explosive unit consumption is established.Finally,based on the empirical volume calculation formula of blast hole charge,a method for fine calculation of blast hole charge in tunnel bench blasting is proposed.Based on the excavation test section of Zhaishan Tunnel of Linyi-Tengzhou Expressway,the reliability of the calculation method of blasthole charge is verified.The research results are of great significance to guide the fine blasting of tunnel.
tunnel engineeringdrilling and blasting methodcharge massblasting rock volumeunit explosive consump-tion
万方数据
维普
