Experimental Study On Energy Evolution Of Coal And Gas Outbursts

As one of the important disasters in the production process of coal mine, coal and gas outburst is seriously affect the safety of mine production. The prevention of coal and gas outburst is still a worldwide problem, with the worsening of mining conditions, all kinds of disasters of the coal is becoming more and more serious. Due to the complexity and danger of coal and gas, it is difficult to carry out the experiment in the field, using coal and gas outburst simulation experiment device in the laboratory,, to reseach the energy change in the process of outburst is one of the main research methods. In this paper, we use portland cement, sodium humic acid, CMC and sodium silicate material as the base material to study the impact of various types of cements on the mechanical properties of coal, consistent coefficient, and gas adsorption analytical characteristics. By orthogonal complex development of new coal cement, used to highlight simulation of coal production. Experimental results show: when the proportion of cement is portland cement: sodium humic acid: CMC: sodium silicate= 2%:12~15%:4%:4~6%, the compressive strength of briquette and the characteristics of gas adsorption and coal is close to.In order to study the coal and gas outburst process of energy evolution in coal and gas outburst induced,with the two important induction factors of gas pressure and stress as study variables, respectively with the design of gas pressure(0.65 MPa, 0.75 Ma, 0.85 mpa and 0.95MPa) and crustal stress(5 MPa, 10 MPa, 15 MPa and 20 MPa) of the four different variable parameters, carry out orthogonal experiments. Research on the energy change process of coal and gas outburst.Through the test results can be found that with the increase of gas pressure and crustal stress, the amount of coal is also increasing, the outstanding strength and the prominent effect is also strengthened. When the gas pressure is 0.65 MPa, there will not be a prominent phenomenon, with the increase of the outstanding energy, first in the area near the mouth of the collection of coal, and then can be collected in each area of coal samples. When the gas pressure is 0.75 MPa, outburst amount for 2.99kg-3.19 kg, accounting for testing the amount of coal 19.95%-21.34%; when the gas pressure is 0.85 MPa. Outburst amount for 3.50kg-3.73 kg, accounting for testing the amount of coal 23.19%-24.79%; when the gas pressure is 0.95 MPa, the quantity of outburst coal 4.30kg-4.61 kg, accounting for testing the amount of coal 28.65%-30.70%.For the same gas pressure of different crustal stress tests highlighted the amount of coal and the same crustal stress different gas pressure of the outburst coal quantity comparative analysis we can find that, with a gradual increase of the gas pressure and stress, relatively prominent strength gradually increased. The influence of gas pressure on outburst intensity is greater than that of crustal stress. The study provides reference for the prevention and control of coal and gas outburst.