针对似层矿开采的特点，以卡房分矿I-9采空区为工程实例，将地下空区顶板视为梁模型、改进梁模型，结合岩梁、结构力学和材料力学理论，以顶板岩层抗拉强度为控制条件，推导出地下空区不同跨度下顶板的安全厚度。研究结果表明：顶板安全厚度随空区跨度的增加而增大，近乎呈线性关系。低水平应力时随空区跨度增加对顶板厚度整体影响都较小；当采空区跨度较小时，不同水平应力程度对顶板安全厚度的影响可忽略不计；当空区跨度达到一定程度时，对比梁模型计算的结果，随空区跨度的增加改进梁模型计算的顶板安全厚度增加幅度变大。
According to the characteristics of the near-bedded ore mining ,with Yunxi Kafang I-9 goaf taken for an engineering instance ,the roof of underground vacant area was regarded as a beam model and improved beam model and combined with rock beam theory ,structural mechanics and material mechanics theory ,the determination of the roof safety thickness in various goaf span was derived by taking the tensile strength of roof as the constrain condition .The results indicate that the height of roof increases with the increase of goaf span and the relation is approximately linear . The low horizontal stress has a light effect upon the thickness of roof with the increasing span .When the span of vacant area is small ,different horizontal stress degree has little impact on the thickness of roof .When goaf span reaches a cer-tain extent,compared with the calculative results of beam model ,increasing amplitude of the roof safety thickness of improved beam model heightens with the increase of the span .
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