上向分层充填法点柱尺寸对地表变形影响分析

摘要

随着我国国民经济的不断发展,对矿产资源的需求日益增加,一些原来没有开采价值的"三下"资源项目也逐步列入了开采计划. 如何安全、高效、经济、合理地回收这些资源,并确保不影响到地表相关设施的安全,是近年来采矿界研究的重点. 根据苍山铁矿矿体开采技术条件,提出了目前比较适用于低价值资源开采的盘区点柱式上向分层充填采矿方法,通过参考类似矿山的经验,初步选择了几组可行的采矿方法点柱尺寸及顶板暴露面积参数,并利用数值模拟方法分析预测其对地表变形的影响. 通过多方案组合的模拟分析比较,采用采场点柱尺寸4 m×4 m的情况下,暴露面积为500 m2 时方案较优,可提高矿石回收率3% ~5%;模拟结果同时表明在此采场参数下,地表移动变形预测值均小于规程所允许值.%With the continuous development of China''s national economy,the demand for mineral resource is increasing. Some "three-under" resources that was not worth mining in the past are gradually listed to be mined. It is a focus in the study of mining industry in recent years that how to recycle those resources safely,efficiently,economically and ensure the safety of the related facilities on the surface. The panel overhand cut and filling mining method which is suitable for low value resources is put forward based on the mining technology condition of Cangshan Iron Mine. Groups of parameters including pointed pillar size and exposed area of roof are primarily selected by reference to the similar mining experience. Then,the numerical simula-tion is used to analyze and predict its influence on surface deformation. The results show that the scheme with pillar size 4m× 4m and exposed area of roof 500 m2 is optimal,compared with other schemes. It improves the ore recovery by 3% ~ 5%. The simulation results show that the surface deformation value is less than the allowed under the recommended parameters.