The Applied Research of Loose Blasting Technique in Managing Crushing Accident of Fully Mechanized Coal Mining Face

摘要

Support crushing accidents occur frequently in coal mines, which have a serious impact on their safety production. Usually people adopt the loose blasting technology for processing the pressing frame accidents, that is, using the detonative action generated by explosives to cause the rock mass particles' vibration which would spread in the form of stress wave to crush the surrounding rock mass. After the release of the rock mass internal stress, the hydraulic support would make use of its own abutment pressure to prop up again the overlying rock and make it work normally. Based on the research of detonative action and making use of FLAC3D numerical simulation technology, this paper provides a theoretical basis as well as the experience for handling the pressing frame accidents by applying a dynamic load test to theoretically calculate the appropriate explosive amount.