Investigation of sudden faults instability induced by coal mining
MetadataShow full item record
© 2019 Elsevier Ltd Study on the mechanism of coal burst induced by faults instability is a major concern for the safety mining and efficient production in the underground coal mine. In this paper, the sharp change of roof bolt loading, roof separation, roadway deformation and mining face support stress were observed during the routine field tests. According to the preliminary estimation, the reason for such a phenomenon was possibly relevant to the sudden instability of fault structures. To investigate the sudden faults instability, a physical test was carried out with two fault structures. The modelling results suggest that the strain rate from relatively low to sudden changes may be identified as a precursor of fault slip. The overlying strata was severely collapsed under the interactive effect of two faults. The depth of collapsed strata between two faults was higher than that influenced by a single fault. The difference between the first-stage and the second-stage coal mining is studied in three aspects: the area of fault influenced zone, characteristics of stress distribution near fault and the degree of fault slip. Due to the severely collapsed strata between two faults, the abrupt stress change could be induced during excavation of coal mining face, and thus, more attention should be paid to the influence of overlying strata movement above goaf between two faults. The sudden collapse of roof strata and abrupt stress change could release tremendous strain energy and induce coal bursts.
Showing items related by title, author, creator and subject.
Mahdevari, Sattar; Shahriar, Kourosh; Sharifzadeh, Mostafa (2017)Summary: Induced stresses and various instabilities and deformations are resulted due to stress concentrations around a longwall face. A considerable part of the induced stresses is transferred ahead of the face and onto ...
Chamani, Amin (2013)Underground gas injection has attracted remarkable attention for natural gas storage and carbon dioxide (CO2) geologic sequestration applications. Injection of natural gas into depleted hydrocarbon reservoirs is the most ...
Developing completion criteria for rehabilitation areas on arid and semi-arid mine sites in Western AustraliaBrearley, Darren (2003)Continued expansion of the gold and nickel mining industry in Western Australia during recent years has led to disturbance of larger areas and the generation of increasing volumes of waste rock. Mine operators are obligated ...