摘要
李家河勘查区煤层埋深较大,顶底板岩性松软,抗压强度不大,在矿井建设和生产阶段易出现顶底板事故,影响矿井的安全生产。在分析勘查区地质背景的基础上,对主采煤层的发育特征进行了分析,对顶底板岩石的力学性质进行了测试,依据划分方案对顶底板的稳定性进行了评价。结果表明:勘查区2煤伪顶与直接顶普遍发育,其岩性多为炭碳质泥岩、砂质泥岩、泥岩等抗压强度相对较小的岩石,属于不稳定的顶板;3煤伪顶零星分布,厚度较小,为碳质泥岩、砂质泥岩、泥岩;勘查区局部地段煤层直接与砂岩老顶接触,抗压强度相对较大,属于稳定性较差的顶板;勘查区2煤和3煤伪底均为泥岩及砂质泥岩,呈孤岛状零散分布,直接底砂泥岩及铝质泥岩普遍发育,抗压强度相对较大,属于稳定性较差的底板。
The coal buried depth in the Lijiahe exploration area is rather deep,with crumble roof and floor rocks,lower compressive strength,thus roof and floor accidents will be frequently appeared,and impacted coalmine safety production.Based on exploration area geological setting analysis,analyzed development features of main mineable coal seams,and tested mechanical property of roof and floor rocks.According to scheme delimitations,assessed the stabilities of coal roof and floor.The result has shown that the coal No.2 false and immediate roofs are generally developed in exploration area,mostly carbonaceous shale,sandy mudstone and mudstone with lower compressive strengths,belong to unstable roof.The coal No.3 scattered false roofs have small thickness,mainly carbonaceous mudstone,sandy mudstone and mudstone;in exploration area local sectors,coal seam directly contacted sandstone main roof with relatively large compressive strength,belong to poorer stability roof.False floors of coal Nos.2 and 3 are all mudstone and sandy mudstone isolatedly scattered;immediate floors are generally developed sandy mudstone and aluminous mudstone,with relatively large compressive strength,belong to poorer stability floor.
作者
田拴来
Tian Shuanlai(Exploration and Research Institute,CNACG,Beijing 100039)
出处
《中国煤炭地质》
2018年第2期58-63,共6页
Coal Geology of China
关键词
煤矿开采
深埋煤层
发育特征
抗压强度
力学性质
coal mining
deep buried coal seam
development features
compressive strength
mechanical property
