孤岛工作面顶板破断的薄板模型分析

Sheet Model Analysis of Roof Rupture in Island Working Face

为了研究孤岛工作面的顶板破断机理,利用理论分析和数值模拟的方法建立了两对边简支两对边固定、三边简支一边固定的顶板薄板力学模型。分析计算得出薄板的极限破断准则和应力分布情况,并通过极限破断准则计算出顶板破断初次来压步距和周期来压步距。通过现场观测顶板断裂的初次来压步距和周期来压步距,其结果与理论分析计算的结果较吻合,可为类似的工作面来压预报提供依据。

In order to study the roof breaking mechanism in the island working face, the sheet model for roof breaking mechanism with two opposite sides simply supported and other two opposite sides fixed or three sides simply supported and one side fixed was established by using the theoretical analysis and numerical simulation methods. Through the analysis and calculation, the limit fracture criterion and stress distribution of the sheet were obtained, and with the limit fracture criterion of the sheet, the first weighting and the periodic weighting distances of roof rupture were calculated out. It was found from the site observation of the first weighting and periodic weighting distances that this result was consistent with both the theoretical result and calculated result, which can be used as a basis for forecasting the roof weighting in the working face.