| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve a blasting method and a blasting structure of a blasting area such as a working face, and thereby enhance a sound deadening function.SOLUTION: Multiple blast holes 3 buried with explosives 3a are formed in a working face 2 of a tunnel 1, and then a foam solution prepared by diluting a gas generating agent with liquid is sprayed on an end face 2a of the working face 2 so as to cover each blast hole 3, and thereby a sound deadening layer 4 is provided. By the sound deadening layer 4 provided by spraying the foam solution on the end face 2a of the working face 2, a sound deadening function can be enhanced in the blasting of the working face 2. Also, the sound deadening layer 4 can easily be provided by the blast of the foam solution.</p> |
