露天铁矿端帮开采诱发地表及岩层移动规律

本文采用三维物理模型试验方法,以辽宁鞍山眼前山铁矿为工程依托研究了端帮开采诱发地表及岩层移动变形规律。试验结果发现岩体中控制性节理的存在对岩层移动范围及变形过程和机理有重要影响;模型试验发现采空区上方岩层移动变形表现为“井”状陷落,这与现场调查发现的塌陷坑吻合。结果表明物理模型试验可以在微观上再现采矿诱发地表及岩层移动的全过程,有助于我们半定量的分析岩层移动变形机理。

Study on the law of surface and rock strata movement induced by open-pit highwall mining in opencast iron mine

In this paper, three-dimensional physical model test method is used to study the law of surface and rock movement and deformation induced by open-pit highwall mining based on the project of Anshan Yanqianshan iron mine in Liaoning Province. The results show that the existence of controlling joints in the rock mass has an important influence on the range of strata movement, deformation process and mechanism; the model test shows that the strata movement and deformation above the goaf is a "well" collapse, which is consistent with the collapse pit found in the field investigation. The results show that the physical model test can reproduce the whole process of mining induced surface and strata movement in microcosmic, which is helpful for us to analyze the deformation mechanism of strata movement semi quantitatively.