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主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
水库水体及坝体下多煤层开采可行性分析
  • Title

    Feasibility analysis of multiple coal seams mining under reservoir and dam

  • 作者

    刘贵汪义龙高超田国灿

  • Author

    LIU Gui WANG Yilong GAO Chao TIAN Guocan

  • 单位

    中煤科工开采研究院有限公司,煤炭科学研究总院开采研究分院,天地科技股份有限公司开采设计事业部,华能煤炭技术研究有限公司

  • Organization
    CCTEG Coal Mining Research Institute Coal Mining Branch,China Coal Research Institute Coal Mining and
    Design Department, Tiandi Science & Technology Co,Ltd. Huaneng Coal Technology Research Co.,Ltd.
  • 摘要

    水库下采煤,在保证煤矿井下安全生产的同时,也要保证水库水体与坝体不被破坏,这牵涉到水体下、水工构筑物下的煤层安全开采。在开展在水库水体与坝体不受开采损坏的同时,实现井下安全生产可行性的研究。基于BLS煤矿的地质采矿条件及地面水库、坝体情况,通过分析各煤层上覆岩层岩性,确定了覆岩类型为中硬-坚硬覆岩类型,并根据近距离煤层开采覆岩破坏高度计算规则,计算出了覆岩破坏高度。在此基础上进行了防水安全煤岩柱高度的预计、工作面充水影响分析和C2、C3、C4、C7+8煤层的采动影响计算。结果表明:①水库区域煤层埋深大,可采煤层为薄及中厚煤层,覆岩破坏发育高度低。在水库、浅层水体与采动破坏之间赋存有分布稳定、厚度大、未被采动破坏的隔水岩层,同时在水库区域周边未揭示大型断层或陷落柱等构造。隔水岩层良好的隔水性能使得水库、浅部水体与采动影响区域没有水力联系,开采不会使水库蓄水的原有地质条件发生变化,水库、浅层水体的赋存状态基本不受煤层开采的影响,因此水库下开采可行;②C2煤层开采后,坝体受到最终的静态变形为压缩变形,值为-1.3 mm/m,相对拉伸变形,压缩变形对保护坝体较有利。在C2煤层开采过程中坝体还可能受到的动态最大拉伸变形在2.0 mm/m以内,在允许变形范围内,坝体基本不会产生损坏;③其余煤层开采时须留设坝体保护煤柱或采取其他措施以保证坝体安全使用。




  • Abstract
    Coal mining under the reservoir should not only ensure the safety of underground production,but also ensure that the water body and dam body of the re servoir will not be damaged. It involves safe mining under water and hydraulic structures. This paper is to carry out the feasibility study of underground safety productio n while the reservoir water body and dam body are not damaged by mining. Based on the geological mining conditions and surface reservoir、dam conditions of BLS Co al mine,Based on the analysis of the lithology of the overlying strata of each coal seam,it is determined that the overlying strata are of medium hard-hard type,and accor ding to the calculation rules of overburden failure height in close distance coal seam mining,the overburden failure height is calculated. On this basis,the prediction of th e height of the waterproof safety coal pillar,the analysis of the influence of the water flling in the working face and the calculation of the mining influence of coal seams C2,C3,C4 and C7+8 is carried out. The results show that:①In the reservoir area,the coal seam is deeply buried,the minable coal seam is thin and medium thick,and the overburden damage is low. There are stable,thick and non-mining damaged water resisting strata between the reservoir,shallow water body and mining damage. At the same time,no large-scale faults or collapse columns and other structures are revealed around the reservoir area. The good water resisting strata makes the reservoir,sh allow water body and There is no hydraulic connection in the area affected by mining. Mining will not change the original geological conditions of the reservoir water sto rage,the occurrence state of the reservoir and shallow water body is basically not affected by the coal mining,and mining under the reservoir is feasible;②After coal se am C2 mining,the final static deformation of the dam body is compression deformation,with a value of-1.3 mm/m. Relative tensile deformation is more beneficial to the p rotection of the dam body. In the process of coal seam C2 mining,the maximum dynamic tensile deformation of the dam body may also be within 2.0 mm/m. Within the a llowable deformation range,the dam body will not be damaged basically; ③When mining other coal seams,the dam body shall be reserved to protect the coal pillars or 0 ther measures shall be taken to ensure the safe use of the dam body.
  • 关键词

    ​水库下采煤多煤层充水性坝体保护采动影响

  • KeyWords

    coal mining under reservoir; multiple coal seams; water flling; dam protection; mining influence;

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    • 水库大坝现场施工

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