【摘要】 对于锚网支护的煤巷来说,顶板离层是潜在的安全威胁。为确定锚网煤巷的顶板离层临界值,分析了煤巷顶板离层的发生机理,建立了锚网实体煤巷道和锚网沿空巷道的顶板临界离层的力学模型;在此基础上通过近似和简化,求解了两类锚网煤巷的离层临界值数学表达式。最后根据一回采工作面的基本条件,试算了两类煤巷的顶板离层临界值,并与实际观测数据进行了对比和分析。结果表明沿空巷道的顶板离层值远大于实体煤巷道的顶板离层值,建立的沿空巷道离层值表达式能够很好的与实测值吻合,实体煤离层值表达式与实测值虽有差距,但能够用于巷道掘进期间的顶板离层预测。更多还原

【Abstract】 As for the coal mining roadway with bolt support,it’s the most dangerous that the roof usually falls because roof bedding separation value is too large.In order to calculate the critical value of roof bedding separation,the mechanism of roof bedding separation was analyzed,moreover,the mechanical models of solid-coal roadway and gob-side roadway were built.Based on analyzing the mechanical property of the two different roadways supported with bolts,the mathematical representations of roof bedding separation critical value were got.Finally,a calculation example was showed,and the results indicated that the roof separation critical value of gob-side roadway is more than that of solid-coal roadway.Furthermore,the representation of gob-side roadway coincided with the monitoring value,and the representation of solid-coal roadway can be used to predict the critical value in the period of driving.更多还原