Spontaneous combustion influenced by surface methane drainage and its prediction by rescaled range analysis  

作　　者：Shengqiang Yang Xincheng Hu Wei Victor Liu Jiawen Cai Xiuhong Zhou 

机构地区：[1]School of Safety Engineering,China University of Mining&Technology,Xuzhou 221008,China [2]Key Laboratory of Gas and Fire Control for Coal Mines,Xuzhou 221008,China [3]Department of Civil&Environmental Engineering,University of Alberta,Edmonton T6G 2W2,Canada

出　　处：《International Journal of Mining Science and Technology》2018年第2期215-221,共7页矿业科学技术学报（英文版）

基　　金：provided by the National Natural Science Foundation of China (No. 51174198);China Scholarship Council (No. 201506420024)

摘　　要：This study established numerical modeling using COMSOLTMto examine the influence of horizontal location and drainage ability of surface borehole on spontaneous combustion in longwall working face gob. Rescaled Range Analysis(R/S analysis) was employed to investigate the chaos characteristic of N_2/O_2 ratio from a surface borehole in 10416 working face gob, Yangliu Colliery, China. The simulation results show that there is always a circular ‘‘dissipation zone" around the drainage borehole and an elliptic ‘‘spontaneous combustion zone" in deep gob. Little influence was found on spontaneous combustion zone on the intake side of the gob but the width of spontaneous combustion zone in middle gob is enlarged, while the depth of spontaneous combustion zone near the return side is reduced. The R/S analysis indicates that the influence of surface borehole on spontaneous combustion can be divided into two stages by the chaos feature of N_2/O_2: safety drainage stage and spontaneous combustion initiating stage. It can be concluded that the methane drainage from gob through surface borehole can intervene in the distribution of spontaneous combustion zone in gob and the chaos feature of N_2/O_2 from surface borehole can effectively reflect coal spontaneous combustion condition in gob.This study established numerical modeling using COMSOLTMto examine the influence of horizontal location and drainage ability of surface borehole on spontaneous combustion in longwall working face gob. Rescaled Range Analysis(R/S analysis) was employed to investigate the chaos characteristic of N_2/O_2 ratio from a surface borehole in 10416 working face gob, Yangliu Colliery, China. The simulation results show that there is always a circular ‘‘dissipation zone" around the drainage borehole and an elliptic ‘‘spontaneous combustion zone" in deep gob. Little influence was found on spontaneous combustion zone on the intake side of the gob but the width of spontaneous combustion zone in middle gob is enlarged, while the depth of spontaneous combustion zone near the return side is reduced. The R/S analysis indicates that the influence of surface borehole on spontaneous combustion can be divided into two stages by the chaos feature of N_2/O_2: safety drainage stage and spontaneous combustion initiating stage. It can be concluded that the methane drainage from gob through surface borehole can intervene in the distribution of spontaneous combustion zone in gob and the chaos feature of N_2/O_2 from surface borehole can effectively reflect coal spontaneous combustion condition in gob.

关 键 词：Coal SPONTANEOUS combustion SURFACE drainage BOREHOLE Hurst index Rescaled range analysis METHANE drainage SYMBIOTIC DISASTER 

分 类 号：TD[矿业工程]