Coal and gas outburst simulation system based on csiro model

To achieve the adjustability of the parameters of geostress, gas pressure and coal properties, some design ideas and technical requirements of the simulation system were proposed based on the hypothesis of combined effects and CSIRO model after analyzing the advantages and disadvantages of existing devices. The simulation system was developed with the modular design idea. The system can apply geostress up to 30 MPa and gas stress up to 3MPa. The acquisition frequency of gas pressure is up to 1000 Hz. Synchronized acquisition of gas pressure and speed achieved precise record of the prominent transient information. The system is easy to operate and the single test is fast which shorten the testing cycles. 9 groups of crosscut exposing coal outburst simulation test of gas filled coal were carried out. The test results showed that coal and gas outburst was affected by the combined effect of geostress, gas pressure and coal strength. The coal strength prevented the outburst. The dynamic thresholds of gas pressure existed corresponding to different damage states of coal. The dynamic phenomena appeared strongly, and the cavities were large inside with small exit holes after outburst. © 2015, Science Press. All right reserved.