CAJ | 학술논문

针对瓦斯抽采下沿空留巷采空区遗煤自燃问题,以试验矿24208工作面为研究背景,采用UDEC4.0和Fluent进行数值模拟,识别了工作面回采过程中顶底板裂隙发育形成机制及演化规律,分析了风量对采空区流场及风排瓦斯的扰动关系,采用示踪气体实测了工作面立体空间的漏风去向及漏风比例.结果表明：当工作面推至65 m 时覆岩层达最大程度卸压,垂直裂隙发育高度最大达25 m,有效满足瓦斯抽采；采空区的漏风去向：工作面—采空区—压埋管钻孔、工作面—采空区—沿空留巷、工作面—采空区—邻近层高位钻孔；随风量的增加,采空区氧化带宽度不断扩大且向深部靠拢,下边界整体后移,上隅角瓦斯浓度逐渐下降.
침대와사추채하연공류항채공구유매자연문제,이시험광24208공작면위연구배경,채용UDEC4.0화Fluent진행수치모의,식별료공작면회채과정중정저판렬극발육형성궤제급연화규률,분석료풍량대채공구류장급풍배와사적우동관계,채용시종기체실측료공작면입체공간적루풍거향급루풍비례.결과표명：당공작면추지65 m 시복암층체최대정도사압,수직렬극발육고도최대체25 m,유효만족와사추채；채공구적루풍거향：공작면—채공구—압매관찬공、공작면—채공구—연공류항、공작면—채공구—린근층고위찬공；수풍량적증가,채공구양화대관도불단확대차향심부고롱,하변계정체후이,상우각와사농도축점하강.
For the gob coal spontaneous combustion problem under gob-side entry retaining and gob gas drainage,formation mechanism and evolution law of roof and floor fracture in the process of 24208 working face of test mine mining were identified by UDEC4.0 and Fluent software for numerical simulation. The influence of air volume and gob air flow field and the gas drainage by ventilation was an-alyzed. The flow trace and volume of air leakage of the stereo space of working face were measured by u-sing tracer gas. The results show that overburden stratum achieves the maximum range pressure relief when the working face advancing to 6 5 m and vertical fracture maximum height reaches 2 5 m,which ef-fectively meet the gas drainage;the passage of gob air leakage as follows:working face-gob-buried hole for gas drainage and working face-gob-gob side entry retaining and working face-gob-adj acent layer high hole;the gob oxidation zone width expands and draws close to the deep and the down boundary integral moves to backward with the increase of the air volume,and then the gas concentration in return corner is gradually decline.