露天转地下开采护顶矿柱尺寸优化研究

Optimization of the Size of Protective Roof Pillar in Open-pit to Underground Mining

对于露天转地下的开采工程,护顶矿柱是矿山地下开采浅部转深部的关键衔接部分,护顶矿柱的厚度不仅关系着地下开采的安全性,同时也影响矿山的经济效益,其尺寸的合理性对工程稳定性及深部开采安全极其重要。某铁矿为大型深凹露天矿,露天开采结束后将转入地下开采,本文采用FLAC^(3D)软件,结合铁矿工程地质条件、开采工艺方案等建立三维数值模型,对不同厚度时护顶矿柱的稳定性进行模拟分析。结果表明,护顶矿柱的设置确实能够有效控制围岩变形和空区破坏,保证空区下矿体回采的安全进行,确定了最佳护顶矿柱厚度。对类似矿山资源回收及安全生产具有一定的参考和借鉴意义。

For open-pit to underground mining projects,the protective pillar is a key connecting part of the shallow to deep underground mining.The thickness of the protective pillar not only affects the safety of underground mining,but also affects the economic benefits of the mine.The rationality of its size is extremely important for the stability of the project and the safety of deep mining.An iron mine is a large deep open pit mine,and after the completion of surface mine mining,it will be transferred to underground mining.In this paper,FLAC^(3D) software is used to establish a three-dimensional numerical model in combination with the engineering geological conditions of the iron mine,mining process plan,etc.,to simulate and analyze the stability of roof pillars with different thicknesses.The results indicate that the setting of isolation pillars can effectively control the deformation of surrounding rock and the destruction of the goaf,ensure the safe mining of the ore body under the goaf,and determine the optimal thickness of artificial isolation pillars.It has certain reference and reference significance for recycling and safety production of similar mines.