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本文根据实验室模拟试验,确定了松散物质密度对放矿指标的影响,并提出按照放矿层厚度和崩下矿石的密度来确定合理的放矿制度。一步骤回采的特点之一是在挤压介质中崩下的矿石具有很大的密度。这对崩落矿块中矿石流动的性质影响很大,对整个采矿方法的数量和质量指标也有很大的影响。随着松散物质密度的增加,其物理力学性质也有所改变,初始剪切力τ_0和內摩擦角φ随之增加。因此,放矿体和松散体向细长形状变化,在同样二次松散体形的高度时,二次松散体的体积减小,而放矿体的体积增大。
Based on the laboratory simulation tests, the paper determines the influence of loose material density on the ore-dressing index and puts forward that the reasonable ore-dressing system should be determined according to the thickness of the ore-dressing and the ore density. One of the characteristics of a one-step mining is the large density of ores that have collapsed in the extrusion medium. This has a significant impact on the nature of ore flows in the caving blocks and also has a large impact on the quantity and quality of the overall mining method. With the increase of the density of the loose material, its physical and mechanical properties also change. The initial shear force τ_0 and the internal friction angle φ increase. Therefore, the ore body and loose body to the elongated shape changes in the same secondary loose body height, the volume of the secondary loose body decreases, while the ore body volume increases.