摘要
我国西部地区煤矿采煤工作面瓦斯涌出量大,瓦斯超限严重影响工作面安全回采,目前采用的走向高抽巷方式因其具体布置层位多凭经验选取,若布置不合理,则抽采效果差,不能有效地治理工作面瓦斯,故进行走向高抽巷布置参数的优选具有重要意义。为此,在理论分析计算的基础上,针对西部地区典型的开采条件,采用非线性大变形程序数值模拟了采空区顶板覆岩应力分布及裂隙演化规律,确定了走向高抽巷应布置在采空区顶板裂隙带的中上部40m的岩层中,距回风巷水平投影距离为40m。并以山西天池煤矿103工作面为例,验证了高抽巷布置参数的合理性,其最大瓦斯涌出量高达90.32m3/min。以此为指导,通过采取走向高抽巷抽采、风排和尾排瓦斯相结合的综合治理技术,日产原煤最高达8 000t,平均瓦斯抽采率达70%,最大瓦斯抽采率达86%,工作面回风流的瓦斯浓度控制在0.8%以下,实现了高瓦斯综放开采工作面的安全高效回采。
In the western regions in China,the volume of gas emission from the coal mining faces is so large as to seriously influence the normal production of coal.Highly-located drainage roadway along roof strike can control gas with pressure relief,and the key factor is to optimize layout parameters.Based on the theoretical analysis and in combination with the specific coal mining conditions,the FLAC program is adopted to simulate the stress distribution and fracture evolution laws of the overlying rocks on the roof strata of the mined-out area.On this basis,the optimal vertical distance is determined to be 40 m between the highly-located drainage roadway and the roof strata,which is situated in the upper or middle parts of mining fractured zones;and the horizontal projection distance from return airway is also 40 m.In the case study of the No.103 coal mining face of the Shanxi Tianchi coal mine with the maximum absolute gas emission rate of 90.32 m3/min,the technology of highly-located drainage roadway along roof strike integrated with gas dilution by return airway and tailing gateway was put into execution.As a result,the mean gas drainage rate reached up to 70%;the maximum gas drainage rate was up to 86%;the concentration of gas in return airway was controlled to be under 0.8%;and the maximal output of coal was 8000 t/d.In conclusion,the highly-located drainage roadway along roof strike is proven to be an effective technology of realizing safe and efficient mining in full mechanized work faces.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2012年第5期81-84,109,共4页
Natural Gas Industry
基金
国家自然科学基金(编号:50974002
41172147)
安徽省教育厅自然科学重点项目(编号:KJ2010A058)
安徽建筑工业学院硕博科研启动项目(编号:2006120122)
关键词
中国西部
煤矿
卸压瓦斯
走向高抽巷
布置参数
数值模拟
瓦斯抽采率
West China,coal mine,relieved methane,high dip tunnel for drawing out gas,distributed parameter,numerical simulation,methane extraction ratio
