| 摘要 |
PROBLEM TO BE SOLVED: To efficiently carry out loading of an explosive without relying on manual work. SOLUTION: In the smooth blasting construction method, charge holes 2a are bored in an outermost circumference of a working face 1, charge holes 2b are bored in an inner side than the outermost circumference, and granular explosives 3 are densely filled in each of the bored charge holes 2a, 2b by mechanical filling. A charge length of the granular explosive 3 to be filled in the charge holes 2b is about 1/2 of a bore length, but a charge length of the granular explosive 3 to be filled in the outermost circumference charge holes 2a is determined by the following procedures. The charge hole 2a is a charge hole for carrying out smooth blasting using a volume decoupling method, and volume of the granular explosive 3 is determined such that air in a gap 6 is attenuated by a shock wave at detonation, and only a gas pressure evenly acts on an inner face of the charge hole 2a. COPYRIGHT: (C)2008,JPO&INPIT
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