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为研究低频机械振动频率对煤体瓦斯含量的影响,建立孔隙瓦斯压力、吸附膨胀力、机械挤压应力作用下振动动态煤体瓦斯含量方程。利用瓦斯吸附/解吸激振与测试系统进行振动未吸附饱和型煤试件试验检验方程,结果显示:振动频率相同,振动时间增加,煤体孔隙增多,煤体内部游离瓦斯增多,瓦斯含量变大;振动时间相同,振动频率越大,煤体孔隙率越大,煤体瓦斯含量越大,且20 Hz与10 Hz含量差值由小变大,30 Hz与20 Hz含量差值由大变小。表明振动增大了煤体孔隙率,使煤体瓦斯含量增加,且振动频率从10,20,30 Hz逐渐增加,孔隙率逐渐变大,煤体瓦斯含量相应变大,方程计算值能较好反应不同振动频率、振动时间作用下煤体瓦斯含量变化规律。
In order to study the influence of low frequency mechanical vibration frequency on the gas content of coal, the gas content equation of dynamic coal gas under pore pressure, adsorption expansion force and mechanical compression stress was established. Vibration adsorption and desorption excitation and test system were used to test the test equations of the specimen of saturated coal without vibration. The results show that the vibration frequency is the same, the vibration time is increased, the porosity of coal is increased, the free gas inside the coal body increases and the gas content becomes larger ; The same vibration time, the greater the vibration frequency, the greater the porosity of coal, the greater the content of coal gas, and the difference between 20 Hz and 10 Hz content from small to large, 30 Hz and 20 Hz content difference from large to small . It shows that the vibration increases the porosity of the coal, increases the gas content of the coal, and the vibration frequency gradually increases from 10, 20 and 30 Hz. The porosity increases gradually and the gas content in the coal increases accordingly. The calculated value of the equation can be better Response of different vibration frequency, vibration time changes of coal gas content.