Abstract: The mass caving of bunch-hole equivalent spherical charge is a large-diameter long-hole new VCR technology based on L. Livingston's spherical charge blasting crater theory and the mechanism of a common stress field formation by several densely arraged parallel long holes. It has the optimal conditions for  comprehensively utilizing the explosive energy, which can not only display the advantage of vertical long-hole spepherical charge such as high energy utilization rate of and good rock fragmentation, but can also overcome its disadvantage such as high cost, large development amount and complex ground pressure management of stope. It is safe, economic and efficient, and therefore, is a new technology that has good competitive power in underground large-diameter long-hole mining field. The paper, based on the description of its application in Dongguashan Copper Mine, makes a comprehensive evaluation of the technology and points out its implementation essentials and improvement orientation.

Key words: Bunch hole, Equivalent spherical charge, Mass Caving