大采高直接顶关键层结构转化特征研究
Research on Structure Transformation Characteristics for Immediate Roof Key Strata with Large Mining Height
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摘要: 针对直接顶关键层结构对大采高综放采场矿压显现影响较大的特点，建立直接顶关键层形成“悬臂梁”结构的判别式，并以金庄煤矿8202大采高综放工作面为例计算分析并现场验证。结果表明，特厚煤层综放采场直接顶关键层能够形成“悬臂梁”结构，在直接顶关键层“悬臂梁”结构保护下，下位直接顶压实滞后，随着工作面推进，直接顶关键层结构又向铰接结构转化，呈现“悬臂梁”结构、铰接结构交替出现形式。Abstract: For the characteristics that immediate roof key strata structure has larger influence on strata behaviors in fully-mechanized caving stope, the criterion of immediate roof key strata "cantilever beam" structure is established. 8202 fully-mechanized caving face with large mining height in Jinzhuang Coal Mine is taken as an example to carry out calculation analysis and on-site verification. Results show that immediate roof key strata of thick coal seam fully-mechanized caving stope can generate "cantilever beam" structure. Under the protection of immediate roof key stratum "cantilever beam" structure, the lower direct roof is compacted and lagging; with the advancing of working face, immediate roof key stratum structure transfers to hinged structure, and presents "cantilever beam" structure, hinged structure alternately.
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