组合关键层理论的应用研究及其参数确定

Study on application of combinatorial key stratum theoryand parameters determining

论证了判定采场主关键层的充分条件应为顶板来压强度条件 .推导出组合关键层弹性模量、承受载荷和极限跨距的计算公式 ,完善了组合关键层理论 .分析了单一主关键层、组合关键层断裂失稳类型判断曲线 ,指出已往文献中所出现的差错 ,并提出了正确的断裂岩块失稳类型判断曲线 ,为组合关键层在浅埋煤层顶板控制中的正确应用提供了依据 .

This paper expresses that plenty condition of determining key stratum is intensive condition of weighting in working face. The formulae of calculating modulus of elasticity, loading and limit span for combinatorial key stratum are given. Determining curve of instability type of ruptured rock block of key stratum and combinatorial key stratum are analyzed. The error existed in foretime literature are redressed, correctly determining curve of instability type of ruptured rock block are put forward. The theory basis for correct application of combinatorial key stratum to shallow coal seam are provided. It is revealed that arch with three articulation not exist in combinatorial key stratum of shallow seam under thick loose sand bed.