不同开采深度下的矿柱强度估算及尺寸确定方法

Pillar Strength Estimation and Size Determination at Different Mining Depths

房柱采矿法中,矿柱尺寸的大小会影响矿柱强度、矿柱所承受的压应力、矿房回采率。在不同开采深度下,矿柱所承受的压应力是逐步递增的,矿柱允许强度逐步增加,矿柱尺寸加大,回采率降低。为确定合理的矿柱尺寸,分别采用Lunder和Pakalnis矿柱强度理论、从属面积法估算矿柱的强度和轴向压应力,从而计算出矿柱安全系数,在此基础上选择合理的矿柱尺寸。通过改变开采深度,可以计算出不同开采深度下的矿柱尺寸,进而计算出回采率。

In the room and pillar mining method,the size of the pillar will affect the strength of the pillar,the compressive stress to which the pillar is subjected,and the recovery rate of the mine.Under different mining depths,the compressive stress on the pillar is gradually increased,the allowable strength of the pillar is gradually increased,the size of the pillar is increased,and the recovery rate is reduced.In order to determine a reasonable pillar size,the strength of the pillar and the axial compressive stress were estimated using the Lunder and Pakalnis pillar strength theory and the dependent area method,respectively,so as to calculate the safety factor of the pillar,and on this basis,a reasonable pillar size was selected.By changing the mining depth,the size of the pillar at different mining depths can be calculated,and then the recovery rate can be calculated.