煤层底板渗流关键层存在性及其作用初探  

A Primary Exploration on Existence and Role of Seepage-Key-Stratum in Coal Seam Floor

作　　者：马林[1] 李天珍[1] 张连英[1] 

机构地区：[1]徐州工程学院土木工程学院,江苏徐州221008

出　　处：《采矿与安全工程学报》2008年第4期458-462,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(50674087);教育部博士点学科专项科研基金项目(20060290504);江苏省高等自然科学基金项目(BK2002114);中国博士后科学基金项目(20040350676);徐州工程学院科研项目(XKY200606;XKY2007219)

摘　　要：建立了一种面向RFPA的煤层底板渗流模型,计算了采场推进150 m时底板的位移和渗透特性及突水因数.对渗流关键层的存在性及其作用进行了初步探讨,提出了渗流关键层的判定条件.通过算例,讨论了承载关键层、隔水关键层和渗流关键层之间的关系.研究表明,如果某一岩层的渗透率远远小于其他岩层,则该岩层对底板渗流的稳定性起决定性作用,为渗流关键层;在算例中,当采场推进150 m时,渗流关键层存在,并且与隔水关键层为同一岩层;渗流关键层对突水因数有较大的影响.A dynamic model of seepage in coal-seam-floor oriented to RFPA was established, the displacement, permeability parameters and water-inrush factor when stope advances 150 m were calculated. Existence and role of seepage-key-stratum in coal-seam-floor are primarily ex- plored, determinant conditions of seepage-key-stratum is put forward. The relationship among bearing-key-stratum, water-insulating-key-stratum, and seepage-key-stratum are considered through a numerical example. Research result shows that if the permeability of a rock stratum is far lower than that of any other strata, the stratum which is called seepage-key-stratum plays a decisive role in the stability of seepage in coal-seam-floor. In the numerical example, a seepage-key-stratum exists, and it is also water-insulating-key-stratum. Water-inrush factor is mainly influenced by the seepage-key-stratum.

关 键 词：煤层底板 渗流关键层 突水因数 渗透特性 

分 类 号：TD313.5[矿业工程—矿井建设]