邹楼铁矿地下开采对地表位移影响分析

Analysis of the Influence of Underground Mining on Surface Displacement in Zoulou Iron Mine

邹楼铁矿由南至北分别划分为邹楼矿床、陈楼矿床和陈楼北矿床,3个矿床计划采用点柱式上向分层充填法进行开采。为研究该采矿方法开采对地表建(构)筑物的影响,通过简化建立矿山地下开采模型,进行三维数值计算,采用FLAC3D软件模拟矿体开采充填过程,建立合理采矿方法模拟方案并进行开采卸荷,由于同种采矿方法在3个矿床开采时会对地表造成不同的影响,所以需要对3个矿床的各采场围岩位移详细分析。结果表明,陈楼北矿床采场顶板最大位移量为97 cm,且随着深度增加,对地表的影响逐渐减小;陈楼矿床顶板最大位移量为13 cm,浅部两矿体的开采对地表沉降影响较大;邹楼矿床顶板最大位移量为39 cm,中央厚大矿体影响范围广,为顶板位移主要影响因素。

Zoulou iron ore deposit is divided into Zoulou deposit,Chenlou deposit and North Chenlou⁃bei deposit from south to north.The three deposits are planned to be mined by point pillar upward slicing and filling method.In order to study the influence of the mining method on the surface structures,the under⁃ground mining model of the mine is simplified,the three-dimensional numerical calculation is carried out,the ore body mining filling process is simulated with FLAC3D software,the reasonable mining method simu⁃lation scheme is established,and the mining unloading is carried out.Because the same mining method will have different effects on the surface when mining the three deposits,the surrounding rock displacement of each stope of the three deposits needs to be analyzed in detail.The results show that the maximum displace⁃ment of the stope roof of North Chenlou deposit is 97 cm,and the influence on the surface decreases with the increase of the depth.The maximum displacement of the roof of the Chenlou deposit is 13 cm,and the mining of the two shallow ore bodies has a great impact on the surface subsidence.The maximum displace⁃ment of the roof of Zoulou deposit is 39 cm,and the central thick and large ore body has a wide range of in⁃fluence,which is the main influencing factor of roof displacement.