Research of rockburst monitoring, forecasting, and prevention in coal mining in China

摘要

As one of the dynamic disasters of coal mine, rockburst seriously affects underground safe coal mining.Based on the laboratory test, field test, and theoretical analysis, this study proposed the principle of the rockburst induced by the combination of dynamic and static stresses and divided such rockburst into three types, including the rockburst induced by primary dynamic stress, the rockburst mainly induced by dynamic stress, and the rockburst induced by the dynamic stress in low critical stress state.The expressions of the static stress induced by coal mining and the dynamic stress induced by mining tremors were obtained.Moreover, theories and technologies at home and abroad was summarized concerning the monitoring, forecasting, and preventing of the rockburst.These mainly include the zoning and leveling forecasting method, the electromagnetic radiation (EMR) technology, the elastic wave and seismic wave computed tomography (CT) technologies in aspect of rockburst monitoring, as well as the intensity weakening theory, the strong-soft-strong structure effect, the directional hydraulic fracturing technology, the roadway support system in regards of rockburst prevention.The prospect of rockburst development suggested that researches concerning the rockburst mechanism should be quantitatively developed around the roadway and coalface surrounding coal-rock mass.It should be focused on the rockburst mechanism and prevention technology of mining with over 1000 km deep and mining in large tectonic zone.In addition, the monitoring and prevention of rockburst should be based on rockburst mechanism.