摘要
煤的坚固性系数f与瓦斯放散初速度△p是反映煤与瓦斯突出危险的主要指标,渗透率则反映了煤层瓦斯抽采难易程度,而煤体结构在某种程度上决定了f、△p的大小与渗透性的好坏。如何快速判识煤体的f、△p和渗透率,为瓦斯突出预测及抽采服务是人们关注的焦点。为此,通过井下煤壁观测,获取一个煤体结构定量表征参数-地质强度指标GSI,并通过实验建立GSI与f、△p、渗透率的定量关系,即通过GSI的直接观测估算这3个参数,使得这3个参数的获取快捷、简便,随时可指导生产。研究表明:f随GSI的增大而增大,呈正相关线性关系;△p随GSI的增大而减小,呈负相关线性关系;渗透率随GSI的变化呈正态分布,在GSI=52.7处达到了最大值。此外,同一煤样湿润后,f增大,△p减小,但与GSI仍然保持同干燥煤样类似的线性关系。
Coal firmness coefficient f and initial velocity of gas diffusion△p reflect the major indexes of the coal and gas outburst. Permeability reflects the difficulty of coal seam gas extraction. In some ways,the coal structure determines the f,△p and permeability.How to identify the f,△p and permeability of coal quickly,and the prediction of coal and gas outburst and drainage service has become the focus of attention. To this end,through the coal wall observation in the underground coal mine,we obtain a quantitative characterization parameters of coal structure that is the geological strength index GSI,and establish the quantitative relation of GSI and f,△p,permeability. That is to say,through direct observation of GSI for estimating the three parameters,which is contribute to obtain three parameters more efficient and convenient,so as to guide production at any time. The results show that the f increases with the increase of GSI,and presents a positive linear correlation; △p decreases with the increase of GSI,and presents a negative linear correlation,and the relationship between permeability and GSI is a normal distribution,which peaked at GSI = 52. 7. In addition,when coal is wet,f increased,while△p decreased,but they still remain the dried coal sample similar linear relationship with GSI.
出处
《煤矿安全》
CAS
北大核心
2014年第11期12-15,共4页
Safety in Coal Mines
基金
河南省科技厅重点科技攻关资助项目(132102210253
112102310362)
河南煤矿安全生产科技发展计划资助项目(H13-089)
关键词
地质强度指标
煤体结构
定量表征
坚固性系数
瓦斯放散初速度
渗透率
geological strength index
coal structure
quantitative characterization
firmness coefficient
initial velocity of gas diffusion
permeability
作者简介
王鹏（1984-），男，河南禹州人，硕士研究生，现从事煤矿安全工程研究。
