摘要
针对神东矿区回风隅角低氧现象频发的问题,从浅埋深近距离煤层群开采采空区覆岩结构特征角度出发,以上湾煤矿22104工作面作为例,使用PFC离散元软件对开采过程中覆岩垮落、裂隙发育与采场应力变化规律进行模拟研究。结果表明:浅埋深近距离煤层群开采时,裂隙可发育至地表,形成贯通漏风通道;下煤层开采可导致复合采空区的形成,同时对上部旧有垮落空间具有明显活化作用,裂隙发育程度升高,加剧地表漏风量。上煤层开采会造成下煤层顶板大幅卸压,导致采空区顶板不易垮落,易形成大面积悬顶。提出并建立了采空区漏风控制、工作面调压、强制放顶相结合的低氧防治体系分别解决地表漏风严重、复合采空区低氧气体涌出与大面积悬顶突然垮落问题,有效解决了工作面回风隅角低氧问题。
In view of the frequent occurrence of low oxygen in the return air corner in Shendong mining area,from the view of structural characteristics of overlying strata in goaf of shallow buried contiguous coal seams mining,the 22104 working face of Shangwan Coal Mine was taken as an example,and the PFC discrete element software was used to simulate and study the variation law of rock caving,fracture development and stope stress in the mining process.The results show that under the given conditions,cracks can develop to the surface,forming penetrated air leakage channel;the mining of lower coal seam can lead to the formation of composite goaf,meanwhile,it has a significant activation effect on the old caving space in the upper part.The development degree of fractures increases,which aggravates the surface air leakage.The mining of the upper coal seam will cause a large pressure relief of the roof of the lower coal seam,which makes the roof of the goaf not easy to collapse and is easy to form a large area of suspended roof.The low oxygen prevention and control system combining with goaf air leakage control,working face pressure regulation and forced roof caving was established to solve the serious surface air leakage,low oxygen gas emission in composite goaf and sudden collapse of large area suspended roof,respectively,and the low oxygen problem was solved.
作者
张岱岳
张翔
李鹏
ZHANG Dai-yue;ZHANG Xiang;LI Peng(CHN Energy Investment Group Co.,Ltd.,Beijing 100011,China;School of Emergency Management and Safety Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;China Energy Shendong Coal Group Co.,Ltd.,Yulin 719315,China)
出处
《煤炭工程》
北大核心
2022年第12期84-89,共6页
Coal Engineering
基金
国家自然科学基金创新研究群体资助项目(52121003)
国家自然科学基金重点资助项目(52130409)
关键词
近距离煤层群
低氧现象
浅埋深煤层
漏风通道
水力压裂
contiguous coal seams
low oxygen phenomenon
shallow buried coal seam
air leakage channel
hydraulic fracturing
作者简介
张岱岳(1984—),男,内蒙古赤峰人,硕士,工程师,现在主要从事煤电一体化及新能源领域的研究工作,E-mail:zhangdaiyue1000@163.com
