含水率对煤与瓦斯突出强度影响的试验研究

Experimental Study on Intensity of Coal and Gas Outburst Effected by Coal Water Content

为了获得含水率对煤与瓦斯突出强度的影响规律,利用自主研发的大型煤岩瓦斯动力灾害模拟试验系统,在恒定瓦斯压力、轴向应力及煤样成型压力等条件下,进行了不同含水率煤体的煤与瓦斯突出模拟试验;同时提出了包含突出煤量和最远突出距离二元信息的数学方程,用于表示煤与瓦斯突出的相对突出强度。试验结果表明:自主研发的大型煤岩瓦斯动力灾害模拟试验系统的试验结果和现场煤与瓦斯突出实际状况相吻合;在轴压8 MPa、瓦斯压力0.8 MPa试验条件下,得出了含水率和相对突出强度呈二次曲线关系;煤体的含水率愈大,则相对突出强度愈小,发生煤与瓦斯突出的可能性也越小。

In order to obtain the influence law of coal water content on the intensity of coal and gas outburst,simulation experiments on coal and gas outburst of different coal water content were conducted by using the large self-developed coal and gas outburst simulation experiment system under the constant gas pressure and axial stress and coal forming pressure.Meanwhile,mathematical equations that contain outburst coal and the farthest projecting distance were proposed to describe the relative intensity of coal and gas outburst. The results showed that laboratory simulation result was basically consistent with the field of coal and gas outburst,therefore,the self-developed simulation experiment system was reliable.And a quadratic curve relation between coal water content and relative intensity of outburst was obtained with axial pressure 8 MPa and gas pressure 0.8 MPa.Furthermore,it could be concluded that the higher coal water content,the smaller relative intensity of outburst,hence the slimmer chances of coal and gas outburst occured.