Experimental Research On Radon Emanation During Deformation And Failure Of Loading Coal Containing Gas

With the extension of mine exploitation to the deep part,the stress of coal seam and the increase of gas pressure,coal and gas outburst and other coal and rock dynamic disasters become more serious,urgent need to be effective,safe and reliable forecasting and forecasting methods.In the process of coal rock fragmentation,the energy dissipation and the precipitation of radioactive radon are accompanied.Therefore,it is of great significance to predict coal and gas outburst by analyzing the law of radon emission from gas bearing coal.In this paper,the law of radon release from the gas bearing coal is studied by means of laboratory experiment and field test,including: the radioactive activity of the coal in the typical mining area was measured by using the experimental system of coal and rock radon radioactivity,and the influence factors of the radioactivity of coal were analyzed;the radon measurement experiment system of underground tunneling face gas concentration and the radon concentration monitoring were preliminarily analyzed by underground mining operations under different gas concentration and the radon concentration;the experimental system of three axis experimental system for the rupture of the cracked gas containing coal with gas contained in the laboratory is used in the laboratory,the experimental results of the radon release from the different confining pressure,gas pressure and temperature are carried out under the condition of three axial loading,the results obtained are as follows:(1)Designed the radon exhalation triaxial loading coal containing gas burst experiment system,and by using the experimental system,combined with the coal containing gas under the condition of triaxial loading failure process of acoustic emission characteristics and the characteristics of stress and strain,for coal containing gas loading failure process law of radon exhalation is studied.The experimental results show that: the change of radon concentration in the four damage stage firstly increases and then increases and then increases,the minimum occurs in the elastic deformation stage;The influencing factors of the law of the loading coal containing gas burst are analyzed,the concentration of radon is increased first and then decreased with the increase of the gas pressure,and the increase of the confining pressure increases with the increase of the confining pressure.(2)The radioactivity of coal in the typical mining area was measured by using the experimental system of radioactivity measurement of coal,and the combination of coal industrial value analysis,analyzes the influence factors of coal activity.The results show that: the content of the radioactive isotope in coal is decreased with the increase of the degree of metamorphism,and increases with the increase of the content of ash in the coal.(3)Using the radon measurement system in hebi 3203 mining face in eighth coal mine of the track,based on the data analysis of gas concentration and radon concentration in different mining working conditions,and combining with the data of the mine,the influence factors of radon concentration in underground mine are analyzed,Study on the variation law of gas concentration and radon concentration in different mining processes and the relationship between them,and discusses the possibility of the method for measuring radon concentration to predict coal and gas outburst,ang which provides a basis for the prediction of coal and gas outburst.