复杂条件下矿柱回采的相似材料模型试验

在空区末充填的情况下回采矿柱，矿柱与采空区顶板的稳定性是一个关键问题。利用相似理论，建立矿柱回采的平面应力相似材料模型，通过观测模拟矿柱开挖过程的应力与变形变化情况，研究了狮子山铜矿西山特大空区下矿柱回采过程的应力变形的变化规律，结果表明，采用分步凹采预帮永久矿柱的回采方案是可行的，矿柱凹采过程中永久矿柱和采空区顶板足稳定的。矿柱回采的实践证明了相似材料模型试验结果是正确的。

Experimental Research on Similarity Model for Ore-Pillar Recovery Under Complex Conditions

The stability of the ore pillar and the roof is a key issue in the pillar recovery in unfilled mined - out area. A plane stress similarity model for pillar recovery was established based on similarity theory. The change law of the stress and deformation in the pillar extraction process in the ultra-large mined-out area in Shizishan Copper Mine was studied by observation and simulation. The results showed that the pillar recovery scheme including staged extraction and permanent pillar preservation wouht be feasible and the permanent pillar and the roof of the mined - out area would be stable in the pillar recovery process. The pillar extraction practice has proved the correctness of the test results of similarity model.