煤层群下保护层开采保护范围的数值模拟  

Numerical Simulation of Protection Scope When Lower-protective Layer Mined in Coal Seams

作　　者：李树清[1,2] 龙祖根[2,3] 罗卫东[4] 解庆雪 赵训 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]贵州省煤矿设计研究院博士后科研工作站,贵州贵阳550025 [3]贵州省矿山安全科学研究院,贵州贵阳550025 [4]贵州盘江精煤股份有限公司金佳矿

出　　处：《中国安全科学学报》2012年第6期34-40,共7页China Safety Science Journal

基　　金：贵州省优秀科技教育人才省长专项资金项目(黔省专合字(2010)61号);贵州省社会发展科技攻关计划项目(黔科合SY字[2010]3005号);贵州省科技厅重大专项计划项目(黔科合重大专项字(2008)6012);教育部科学技术研究重点项目(210147);湖南省教育厅资助科研项目(09B035);湖南省科技计划项目(2011FJ3238)

摘　　要：为确定煤层群下保护层开采上部被保护煤层的保护范围,结合金佳矿一采煤工作面保护层顶底板煤岩层的物理力学参数和地质特征,采用FLAC3D软件模拟下保护层开采中被保护层的应力场及变形场的变化过程,得出保护层的保护效果;并根据保护层开采的应力卸压保护准则和变形保护准则,确定保护层沿倾向和走向的保护范围。结果表明,由于岩性及岩层结构的影响,通过数值模拟确定的各被保护层的保护范围与按照卸压角确定的保护范围有一定差异;分别用现场考察与数值模拟这2种方法所确定的下保护层保护范围基本一致。Aiming at delimited the protection range rising from lower-protective layer mined in coal seams, basing on the geological properties and the physico-mechanical parameters of roof and floor rock strata of protective layer of a certain coal mining working face in Jinjia mine, the changing processes of stress field and deformation field of protective layer during exploiting lower-protective layer were simulated by FLAC3D software. Then, the protecting effect of protective layer was got. According to the protection rule of the deformation and stress-relief in exploiting protective layer, the inclination and strike protection scopes of protective layer were located. The results show that the protection scopes of protected coal seams got with numerical simulation are different from those estimated with relief angle because of influences of rock nature and rock strata structure, and that the protection method of practical test and the rock nature are basically scopes of lower-protective layer located by the consistent with the numerical simulation.

关 键 词：煤层群 下保护层 保护范围 数值模拟 保护准则 

分 类 号：X936[环境科学与工程—安全科学]