深部大采宽条带开采地表移动破坏规律研究

Research on the Surface Movement Damage Law in Strip Mining of Deep Large Wide Orebody

某矿面临村庄建筑物压矿开采难题,为最大限度地回收“三下”压覆矿产资源,该矿一期设计采用条带开采(采宽70m,矿柱140m),待地表移动变形稳定后,对保留的140m矿柱从同一侧进行二次条带开采(采宽50m,剩余矿柱90m),而二次开采的采动影响势必会危害地表建筑物的安全,因此需提前研究采动影响与地表移动变形之间的关系。但是,基于浅部地表岩移经验公式对该矿采动影响的计算结果存在较大误差,说明经验公式已不适用于深部大采宽厚矿体条带开采。通过对该矿其他采区的实测数据及国内部分深部条带开采统计数据回归分析,提出了新的适用于深部厚矿体条带开采岩移参数计算公式。按照新的岩移参数公式预测了该矿二次条带开采地表移动变形值,为保护村庄建筑物安全,进一步回收部分矿柱提供了理论依据,对提高资源回收率具有重要意义。

Due to the mining problem of a under-village mine, the strip mining(mining width is 70m, pillar is 140m) is adopted for the first phase design of the mine to maximize the recovery of “Under building, railway and water” mineral resources. The retained 140m pillar will carry out the secondary strip mining from the same side(mining width is 50m, remaining pillar is 90m) after the surface movement and deformation is stable. The impact of secondary mining will greatly endanger the safety of surface buildings. Therefore,the study on the relationship between mining impact and surface movement deformation in advance is necessary. While in line with the current empirical formula based on shallow surface rock movement, various problems will appear in calculating the mining impact of the mine, which indicates that the classical formula is not suitable for strip mining of deep large wide and thick ore body. From the regression analysis on the measured data in other mining areas of the mine and the statistical data of deep strip mining in China, a new calculation formula of rock movement parameters suitable for strip mining of deep thick ore body is proposed. Then, the surface movement deformation value of the secondary strip mining of the mine is predicted according to the new rock movement parameter formula, which realizes the purpose of further recovering some pillars on the premise of protecting the safety of village buildings. As a result, the great significance of improving the recovery rate of mineral resources is embodied.