煤矿采场上覆油页岩采动裂隙及孔隙率分布  

Mining Fracture and Porosity Distribution of Overlying Oil Shale in Coal Mine Stope

作　　者：万朝骏 鲁义 王怀增 朱立成 陈素贞 郭鑫 王正 秦培建 WAN Chaojun;LU Yi;WANG Huaizeng;ZHU Licheng;CHEN Suzhen;GUO Xin;WANG Zheng;QIN Peijian(School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China;Shandong Lutai Holding Group Co.,Ltd.,Jining,Shandong 272350,China;China Coal XinJi Liuzhuang Mining Co.,Ltd.,Fuyang,Anhui 236200,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭市411201 [2]山东鲁泰控股集团有限公司,山东济宁市272350 [3]中煤新集刘庄矿业有限公司,安徽阜阳市236200

出　　处：《矿业研究与开发》2024年第3期98-104,共7页Mining Research and Development

基　　金：国家自然科学基金面上资助项目(51974119,52174180);国家重大人才工程青年项目(2022QB06801);湖南省杰出青年科学基金资助项目(2022JJ10026)。

摘　　要：为研究上覆油页岩工作面推进过程中覆岩采动裂隙的演化机理,以子长县南家咀煤矿为工程背景,采用UDEC模拟软件,分析覆岩垮落特性与应力卸压区动态演化规律,并根据岩层下沉量得到充分采动下垮落岩体的三维孔隙率分布规律。研究表明:采场覆岩垮落形态呈上窄下宽的梯形分布,采动裂隙呈采空区两侧稳定发育,中部逐步压实至最小值的演化趋势;卸压区垂直应力明显低于采空区中部,赋存于采场垮落带内的油页岩层,卸压区分布形态随工作面推进逐步由“V”形转变为“W”形;根据采空区垮落岩体的三维孔隙率分布模型可知,同一平面高孔隙率区域呈环状分布,且随岩层赋存高度升高环状区域逐渐向采空区中部收缩,整体呈“空心梯台”结构。In order to study the evolution mechanism of mining fractures in overburden during the advancement of overlying oil shale working face,taking Nanjiazui Coal Mine in Zichang County as the engineering background,the UDEC simulation software was used to analyze the caving characteristics of overburden and the dynamic evolution law of stress relief zone,and the three-dimensional porosity distribution law of caving rock mass under full mining was obtained according to the subsidence of rock stratum.The research shows that the caving form of overburden in the stope is as trapezoidal distribution with narrow upper part and wide lower part,and the mining fractures are stably developed on both sides of the goaf,and the middle part is gradually compacted to the minimum value.The vertical stress of the pressure relief zone is significantly lower than that in the middle of the goaf,which occurs in the oil shale of the stope collapse zone.The distribution pattern of the pressure relief zone gradually changes from“V”shape to“W”shape with the advance of the working face.According to the three-dimensional porosity distribution model of the caving rock mass in the goaf,it can be seen that the high porosity area in the same level is circularly distributed,and the circular area gradually shrinks to the middle of the goaf with the increase of the height of the rock layer,and the whole structure is as hollow terrace.

关 键 词：上覆油页岩 UDEC 采动裂隙 瓦斯运移 孔隙率 

分 类 号：TD842[矿业工程—煤矿开采]