多煤层开采层间等效基本顶结构及其活动规律

发布时间：2019-03-08 19:55

【摘要】：针对晋华宫矿多煤层下行开采过程中层间赋存有19m厚中粒砂岩的特殊条件,在分析其覆岩结构特征的基础上建立了多煤层开采的围岩整体结构模型,据此提出了"层间等效基本顶"的概念,通过理论分析探讨了层间等效基本顶覆岩载荷和等效厚度.结果表明:从砌体梁结构稳定角度认为咬合处即为等效基本顶分界,即厚基本顶中下部未损伤区域作为砌体梁结构的主承载区域,其厚度为基本顶等效厚度.等效基本顶破断步距为19.1m,与现场矿压监测结果一致,较好地解释了11号煤层开采时19m厚中粒砂岩作为基本顶时周期来压步距变小的原因.
[Abstract]:In view of the special condition of 19 m thick medium-grained sandstone in the middle layer of multi-seam downstream mining in Jinhuagong Mine, based on the analysis of its overlying rock structure characteristics, the whole surrounding rock structure model of multi-seam mining is established. On the basis of this, the concept of "interlayer equivalent basic roof" is put forward, and the load and equivalent thickness of interlaminar equivalent basic topping rock are discussed by theoretical analysis. The results show that from the point of view of structural stability of masonry beam, the intersection is the equivalent basic roof boundary, that is, the undamaged area of the middle and lower parts of thick basic roof is the main bearing area of masonry beam structure, and its thickness is the equivalent thickness of basic roof. The equivalent basic top breaking step distance is 19.1m, which is consistent with the field monitoring results. The reason why the 19m thick medium-grained sandstone is used as the basic top time period to reduce the pressure step distance is well explained in the No. 11 coal seam mining.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;中国矿业大学(北京)共伴生能源精准开采北京市重点实验室;
【基金】：国家自然科学基金项目(51234005,51504259) 中央高校基本科研业务费专项资金项目(2010QZ06)
【分类号】：TD32

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