| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved smooth blasting(SB) method that can be safely carried out even in the soft rock areas by improving the defects of the conventional smooth blasting method that the drilled face cannot be smoothly finished in the soft rock areas and that the explosive remaining in dumbness occurs in high frequency. SOLUTION: The explosive to be used in the novel SB method is a water- containing explosive composition including an oxidant, water, a thickener, a foaming agent, surfactants, a combusting agent, a sensitizer and a crosslinking agent. The foaming agent has a closed hollow cell structure, the content of the foaming agent is 7-15 wt.%, while the surfactant is lauryl-pyridinium chloride and its content is 0.1-0.4 wt.%. This explosive is wrapped in an explosive package and the package is used in combination with a detonator having the second time fluctuation of <=±50 ms to the standard seconds to comprise the objective SB method. According to this SB method, the working efficiency and safety of the SB method in tunnels and the like are improved.
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