基于非均质采空区渗流模型的高位钻孔瓦斯抽采效果预测分析
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摘要
为了揭示采空区高位钻孔治理综采工作面瓦斯超限的作用机理及规律,以晋煤集团寺河煤矿W1308综采工作面为研究对象,利用UDEC离散元分析软件计算确定高位钻孔布置层位,利用UDF二次开发工具建立符合"O"型圈空隙分布特征的非均质采空区渗流模型,基于分源预测思想建立采空区瓦斯涌出源精准计算模型,最终形成W1308综采工作面采空区瓦斯贮存运移数值计算CFD模型,模拟得到高位钻孔作用下采空区气压场与瓦斯浓度场,并确定了高位钻孔最佳孔口负压为26.3 k Pa,现场实测与模拟结果相对误差小于10%,说明数值模拟方法可用于预测分析高位钻孔瓦斯抽采效果。研究结果表明:其他条件一定时,上隅角瓦斯浓度与回风巷瓦斯浓度随高位钻孔负压增大呈现先减小后增大变化规律,存在最佳孔口负压。
To reveal the law and mechanism of high level boreholes in gob controlling gas overrun in fully mechanized coal face,taking W1308 fully mechanized coal mining face of Sihe Coal Mine in Jincheng Coal Group as the research object, the UDEC software was used to determine the high level borehole layout layer. The seepage model of heterogeneous gob with the gap distribution characteristics of "O"type ring was established by using the further development tools of UDF. Based on the idea of source prediction, the accurate calculation model of gas emission source in the gob was established. Finally the CFD model of gas storage and migration in the gob of W1308 fully mechanized mining face was formed. The gas pressure field and gas concentration field under the action of high borehole were simulated and the mechanism of the high level borehole in gob efficiently controlling gas overrun was revealed, and the optimum negative pressure of the hole was 26.3 kPa. The relative error of the field measurement and the simulation result was less than 10%, and the numerical simulation method could be used to predict the gas drainage effect by high level borehole. The results showed that when other conditions are certain, the gas concentration in the upper corner and the gas concentration in the return air lane decreased first and then increased with the higher negative pressure of the high level borehole, and the optimum negative pressure existed.
To reveal the law and mechanism of high level boreholes in gob controlling gas overrun in fully mechanized coal face,taking W1308 fully mechanized coal mining face of Sihe Coal Mine in Jincheng Coal Group as the research object, the UDEC software was used to determine the high level borehole layout layer. The seepage model of heterogeneous gob with the gap distribution characteristics of "O"type ring was established by using the further development tools of UDF. Based on the idea of source prediction, the accurate calculation model of gas emission source in the gob was established. Finally the CFD model of gas storage and migration in the gob of W1308 fully mechanized mining face was formed. The gas pressure field and gas concentration field under the action of high borehole were simulated and the mechanism of the high level borehole in gob efficiently controlling gas overrun was revealed, and the optimum negative pressure of the hole was 26.3 kPa. The relative error of the field measurement and the simulation result was less than 10%, and the numerical simulation method could be used to predict the gas drainage effect by high level borehole. The results showed that when other conditions are certain, the gas concentration in the upper corner and the gas concentration in the return air lane decreased first and then increased with the higher negative pressure of the high level borehole, and the optimum negative pressure existed.
引文
[1]孙荣军,李泉新,方俊,等.采空区瓦斯抽采高位钻孔施工技术及发展趋势[J].煤炭科学技术,2017,45(1):94-100.
[2]郭建行.高瓦斯易自燃煤层采空区抽采瓦斯方法对比分析[J].煤矿安全,2017,48(11):167-170.
[3]高玉坤,肖善林,闫建浩,等.平山煤矿采空区高位钻孔瓦斯抽放数值模拟[J].煤矿安全,2017,48(4):160-163.
[4]杨明,闫潮,刘亚军.斜交高位钻孔抽采空区瓦斯设计及优化研究[J].中国安全生产科学技术,2014,10(7):117-122.
[5]刘彦青,张浪,李伟,等.移动坐标下采空区流场及遗煤瓦斯浓度场分布[J].辽宁工程技术大学学报(自然科学版),2017,36(3):243-248.
[6]李春元,张勇,李佳,等.采空区瓦斯宏观流动通道的高位钻孔抽采技术[J].采矿与安全工程学报,2017,34(2):391-397.
[7]李俊贤,邢玉忠,王进尚.U+L+高位钻孔组方式下采空区漏风和瓦斯运移规律相似模拟[J].煤矿安全,2013,44(5):7-10.
[8]李彦明.基于高位定向长钻孔的上隅角瓦斯治理研究[J].煤炭科学技术,2018,46(1):215-218.
[9]陈磊,袁和勇,薛韦一,等.高位钻孔与采空区埋管瓦斯抽放技术对比研究[J].中国安全生产科学技术,2013,9(10):98-102.
[10]李广义,许彦鹏.采空区顶板超长定向高位钻孔瓦斯抽采技术研究[J].煤炭工程,2017,49(8):88-91.
[2]郭建行.高瓦斯易自燃煤层采空区抽采瓦斯方法对比分析[J].煤矿安全,2017,48(11):167-170.
[3]高玉坤,肖善林,闫建浩,等.平山煤矿采空区高位钻孔瓦斯抽放数值模拟[J].煤矿安全,2017,48(4):160-163.
[4]杨明,闫潮,刘亚军.斜交高位钻孔抽采空区瓦斯设计及优化研究[J].中国安全生产科学技术,2014,10(7):117-122.
[5]刘彦青,张浪,李伟,等.移动坐标下采空区流场及遗煤瓦斯浓度场分布[J].辽宁工程技术大学学报(自然科学版),2017,36(3):243-248.
[6]李春元,张勇,李佳,等.采空区瓦斯宏观流动通道的高位钻孔抽采技术[J].采矿与安全工程学报,2017,34(2):391-397.
[7]李俊贤,邢玉忠,王进尚.U+L+高位钻孔组方式下采空区漏风和瓦斯运移规律相似模拟[J].煤矿安全,2013,44(5):7-10.
[8]李彦明.基于高位定向长钻孔的上隅角瓦斯治理研究[J].煤炭科学技术,2018,46(1):215-218.
[9]陈磊,袁和勇,薛韦一,等.高位钻孔与采空区埋管瓦斯抽放技术对比研究[J].中国安全生产科学技术,2013,9(10):98-102.
[10]李广义,许彦鹏.采空区顶板超长定向高位钻孔瓦斯抽采技术研究[J].煤炭工程,2017,49(8):88-91.