Coal and gas outburst simulation similarity ratio determination and inversion reduction analysis method

Abstract

The invention relates to a coal and gas outburst simulation similarity ratio determination and inversion reduction analysis method, and belongs to the technical field of coal and gas outburst simulation experiments. The method comprises the following steps of determining a geometric similarity ratio according to the volume of a coal seam affected by outburst on an outburst case site and the volumeof a briquette coal model of a laboratory; constructing a coal and gas outburst energy equation based on the law of conservation of energy, the physical and mechanical properties of a coal body, thegas adsorption performance, the gas pressure and the stress; determining an experimental parameter similarity ratio according to the experimental parameters and the energy equation; and performing similarity design according to the geometric similarity ratio and the experimental parameter similarity ratio, performing a highlighting simulation experiment according to the similarity design, inverting and restoring the occurrence process of a highlighting accident case according to the highlighting simulation experiment, verifying the accident case field parameters, and analyzing the change ruleof the highlighting accident case field parameters. According to the present invention, the geometric similarity ratio is determined through the volume of the coal seam affected by outburst on the outburst case site and the volume of the coal briquette model of the laboratory, and the accuracy of the experimental result is improved.

Description

technical field [0001] The invention belongs to the technical field of coal and gas outburst simulation experiments, and relates to a coal and gas outburst simulation similarity ratio determination and inversion reduction analysis method. Background technique [0002] Coal and gas outburst is an extremely complex dynamic disaster, which is extremely destructive and harmful, and seriously threatens the safe production of coal mines. Reduction and similar simulation of coal and gas outburst accident scenarios are important methods to study coal and gas outburst mechanism and prevention and control technology. It is an effective way to conduct high-similarity engineering simulation tests in the laboratory with large-scale coal and gas outburst simulation devices. and development direction. [0003] At present, scholars at home and abroad have carried out a large number of outstanding simulation experiments, but no reasonable explanation has been given for the determination of ...

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Problems solved by technology

[0003] At present, scholars at home and abroad have carried out a large number of outstanding simulation experiments, but no reasonable explanation has been given for the determination of the similarity ratio and the selection of experimental parameters in the experimental process, especially the determination of the geometric similarity ratio, and the model of the simulation experiment has not been considered. Influence of production error and scale effect on simulation results

[0004] If the rationality of the determination of the geometric similarity ratio and the influence of the model making error and scale effect of the simulation experiment on the simulation results are not considered, then the simulation experiment cannot truly invert and restore the whole process of the outstanding accident, and the results of the simulation experiment cannot be accurately reflected. If the evolution restores the emphasis on the accident scene, the reliability and accuracy of the simulation experiment will not be guaranteed, and the simulation experiment will not be able to guide scientific research and on-site production well.

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