基于弹性剪切梁模型的采场基本顶来压预报

Forecast of Basic Roof Weighting Based on Elastic Shearing Beam Model

采场基本顶初次来压对工作面带来严重的矿山压力显现,对生产和人身安全造成严重威胁。将顶板剪切梁模型用于分析采场基本顶初次来压,确定了基本顶最大等效剪力所在位置,得到了基本顶初次垮落步距的计算公式。随着采空区跨度的不断增加,基本顶等效剪力不断增大。当最大等效剪力达到极限值时,基本顶初次来压,且基本顶断裂位置出现在煤层内部。

The first weighting of mining field will result in serious underground pressure behavior which poses a serious threat to safety of staff and equipments. Elastic shearing beam model is applied to analyzing the first weighting of basic roof to find the location of maximum equivalent shear stress in basic roof. Computation equation of first caving pace of basic roof is obtained. With gob span increasing, equivalent shear stress in basic roof increases. When the maximum equivalent shear stress reaches limit, basic roof firstly weights and broken location of basic roof is ahead of mining face horizontally.