Abstract
As one of the dynamic disasters of coal mines, rockburst seriously affects underground safe coal mining. Based on the laboratory test, field test, and theoretical analysis, this study proposed the principle of the rock burst induced by the combination of dynamic and static stresses and divided such rock burst into three types, including induced by primary dynamic stress, mainly induced by dynamic stress, and by dynamic stress in low critical stress state. The expressions of the static stress induced by coal mining and dynamic stress induced by mining tremors were obtained. Moreover, theories and technologies at home and abroad were summarized concerning the monitoring, forecasting, and preventing of rockburst. These mainly include the zoning and leveling forecasting method, electromagnetic radiation technology, elastic wave and seismic wave computed tomography 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 1,000 km deep and mining in large tectonic zone. In addition, the monitoring and prevention of rockburst should be based on rockburst mechanism.
Highlights
With the increase of mining depth and intensity, rockburst has become a common safety problem for underground coal mines (Dou and He 2001; Brady and Brown 2004)
Based on the laboratory test, field test, and theoretical analysis, this study proposed the principle of the rock burst induced by the combination of dynamic and static stresses and divided such rock burst into three types, including induced by primary dynamic stress, mainly induced by dynamic stress, and by dynamic stress in low critical stress state
The expressions of the static stress induced by coal mining and dynamic stress induced by mining tremors were obtained
Summary
With the increase of mining depth and intensity, rockburst has become a common safety problem for underground coal mines (Dou and He 2001; Brady and Brown 2004). Researchers around the world have developed a lot of studies and proposed a variety of hypotheses on the dynamic disaster mechanism of coal-rock mass according to tests and theoretical analysis, such as energy theory (Cook 1965), stiffness theory (Petukhov and Linko 1979), strength theory (Li 1985), rockburst tendency theory (Kidybinski 1981), three-criteria theory, system deformation instability theory (Zhang 1987), etc. Rockburst research teams of the present study explored the principle of the rockburst induced by static and dynamic stresses superposition to explain rockburst and guide the monitoring and management on the rockburst They profoundly investigated the zoning and leveling forecasting method in aspect of rockburst monitoring, as well as the intensity weakening theory, the strong–soft–strong structure effect in aspect of rockburst prevention. Basing on the summary of the theories and technologies above and the analysis of existing researches (Ju and Pan 2012; Pan et al 2013) on the routine monitoring and controlling technologies of rockburst in Chinese coal mines, this study made prospects for the future development of rockburst monitoring and prevention
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