Terms related to rockburst
Jun 03, 2021| Terms related to rockburst
[Regulations] Article 225 Coal seams that have experienced rock bursts within the mine field, or coal seams that have been identified as having impact tendency (or their roof and floor rock layers) and evaluated as having impact risk are considered as impact Ground pressure coal seam. The mine with rockburst coal seam is rockburst mine.
Article 227 The mining of coal seams with a tendency to shock must be subject to shock risk assessment.
[Executive instructions] Rockburst (burst rock pressure, rock burst) refers to the dynamic phenomenon of coal and rock masses around shafts or working faces. Under the action of excavation disturbance, due to the instantaneous release of elastic energy, the dynamic phenomenon of sudden and severe damage occurs. Accompanied by coal and rock mass throwing, loud noises, air waves and other phenomena.
Impact tendency refers to the natural properties of coal rock masses that can generate rock bursts, which can be identified through laboratory tests.
Shock hazard refers to the possibility and degree of risk of rock bursts in coal and rock masses, and is affected by the comprehensive influence of mine geological factors and mining conditions. The impact risk evaluation results are divided into four levels: no danger, weak danger, medium danger and strong danger.
The definition of rockburst coal seams and rockburst mines is the basis and premise of rockburst prevention. If a rock burst has occurred in the mine, it is directly regarded as a rock burst mine. The coal seam of the mine or its roof and floor strata is identified by testing to have impact tendency, and the coal seam is evaluated as having impact risk, then the coal seam is determined to be a rock burst coal seam