Abstract
Directional roof-cutting with shaped charge blasting is dangerous and produces large vibrations. Accordingly, a new, nonexplosive method known as instantaneous expansion with a single fracture (IESF) has been developed and tested in the field. This method uses a slit-oriented pipe and a special slitting agent triggered by electric current without a detonator. It is capable of producing a single crack that propagates through the rock in a selected direction. The mechanism of directional roof-cutting using IESF is analyzed, and the conditions for directional crack initiation and propagation are presented. The new technique has been successfully applied to directional roof-cutting in an actual coal mine. It resulted in a larger crack rate, a smaller charge, reduced vibration, and an improved safety profile than shaped charge blasting. IESFs are a substitute for explosives and are expected to have broad application prospects in directional rock breaking.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Rock Mechanics and Mining Sciences
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
