远距离煤层群采动区应力场与瓦斯流动场耦合机制研究及应用  

The application research of overlying strata stress field and gas flow field coupling mechanism under the long vertical distance coal seam group mining conditions

作　　者：田富超[1,2] 秦玉金 梁运涛[1,2] 昌孝存[1] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]中国煤炭科工集团沈阳研究院有限公司,辽宁沈阳110016

出　　处：《采矿与安全工程学报》2015年第6期1031-1036,共6页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2011CB201206);国家重大科学仪器设备开发专项项目(2012YQ24012705);国家"十二五"科技支撑计划项目(2012BAK04B09);国家自然科学基金项目(51174113)

摘　　要：探讨了远距离煤层群采动条件下覆岩层应力场、位移场及瓦斯压力场变化特征,建立了围岩应力分布和瓦斯运移的多物理场耦合模型,并借助FLAC3D软件对数学模型进行了有限元求解。分析了峰峰集团2,4号煤层采动过程中覆岩层应力分布规律、覆岩位移特征和瓦斯渗流分布特征。现场试验表明:首采层4号煤的开采,对上部2号煤的卸压效果明显,实际卸压区域大于依据《防治煤与瓦斯突出规定》参考卸压角划定的卸压范围;且瓦斯释放区域较大,2号煤172102,172104工作面瓦斯抽放效果良好,抽放率分别达到33.12%,46.59%,从而消除了突出危险性。This paper has discussed the coupling theory of migration and seepage field of long vertical distance coal seam group in mining conditions and the variation characteristics of displacement field and gas pressure field and has established the overlying rock stress distribution and multi-physics coupling model of gas migration. Based on the numerical analysis software FLAC3 D, the paper has done finite element solution of the mathematical model. In addition, the research has also analyzed the coal seam gas seepage distribution characteristics of Fengfeng Group No.2 and No.4 coal seam during mining, the strata displacement characteristics and the strata stress distribution rules under mining conditions. The engineering verification has shown that： The pressure relief effect is obvious of No.4 coal mine upon the upper part of No.2 coal mine; the actual relief range is larger than that defined by the reference pressure-relief angle on the basis of coal and gas outburst prevention regulations; the gas release field is large, and gas drainage of No.2 coal 172102,172104 working face has an obvious effect, whose drainage rate has reached 33.12% and 46.59% respectively, thus can help to eliminate the out-burst danger.

关 键 词：煤层群 耦合机制 数学模型 渗流场 卸压角 抽放率 

分 类 号：TD712[矿业工程—矿井通风与安全]