摘要
基于工作面工况条件,根据巷道应力"三带"分布情况,推导得出了巷帮煤体透气性变化规律,结合实测的试验地点瓦斯参数,利用Comsol Multiphysics数值模拟软件,模拟了不同情况下巷帮煤体瓦斯排放带宽度。根据模拟结果,当煤层透气性系数更大值时,相对应的瓦斯排放带宽度更大;在其他条件相同时,透气性系数增大,则相应的瓦斯排放带宽度增大;透气性系数相同时,随着暴露时间的延长,瓦斯压力变化梯度逐渐变小;可见,在其他条件相同时,原始瓦斯压力增大,则相应的瓦斯排放带宽度增大;原始瓦斯压力也相同时,随着暴露时间的延长,瓦斯压力变化梯度逐渐变小。
Based on the working conditions of the working face,according to the distribution of stress ' three zones' in the roadway,the change law of permeability of the roadway side coal body is derived.Combining with the measured gas parameters of the test site,the gas emission bandwidth of the roadway side coal body under different conditions is simulated by using Comsol Multiphysics numerical simulation software.According to the simulation results,when the permeability coefficient of coal seam is larger,the corresponding gas emission bandwidth is larger.When other conditions are the same,the gas emission bandwidth increases with the increase of permeability coefficient.When the permeability coefficient is the same,the gas pressure gradient decreases with the extension of exposure time.It can be seen that the original gas pressure increases with other conditions being the same.When the original gas pressure is the same,the gradient of gas pressure changes gradually decreases with the prolongation of exposure time.
作者
孙志国
SUN Zhiguo(Shuiyu Coal Mine of Fenxi Mining Industry Group Co.,Ltd.,Xiaoyi Shanxi 032300,China)
出处
《山西化工》
2019年第1期33-35,46,共4页
Shanxi Chemical Industry
关键词
瓦斯
排放带宽度
参数测试
数值模拟
gas
emission bandwidth
parameter testing
numerical simulation
