上向水平分层充填法采矿地表变形研究

Analysis of Surface Deformation Caused by Upward Horizontal Slicing and Filling Stoping Method

开采地下矿产会造成地表开裂、变形,破坏建筑物,对人们的生产、生活造成严重的影响,矿区地表变形问题一直是影响矿山安全生产的一个重要方面。应用FLAC3D数值分析软件,建立三维地质模型,模拟计算司家营铁矿分步开采回填后相应地表变形情况,并与经验公式计算的地表沉降值进行对比分析。提出了司家营矿区地表变形的一般规律及变形机制,对地表变形的地质灾害做出分析评价。研究结果表明,上向水平分层填充法采矿能有效的控制地表变形问题,填充体对减小变形具有重要的作用。对比分析表明数值模拟结果比经验公式结果偏小,但在合理许可范围内,表明FLAC3D是预测地表变形的一种有效手段,对其他相似采矿引起的地表变形研究和预测具有重要的参考价值。

Exploration of underground minerals usually results in surface cracking,surface deformation,and damage to buildings,which has a serious impact on people＇s production and life.Surface deformation in mining area is always an important aspect affecting mining safety.FLAC^3D software was applied to build a three-dimensional geological model for simulating the surface deformation caused by the upward horizontal slicing and filling stoping in Sijiaying Iron Mine and a contrast with the surface subsidence value calculated by the empirical formula was made.Thus,the general rule and the deformation mechanism concerning surface deformation in Sijiaying Iron Mine were put forwards,and the geological hazards of surface deformation were assessed.The results showed that the upward horizontal slicing and filling stoping method effectively controlled surface deformation and the filling body played an important role in reducing deformation.The contrastive analysis showed that the numerical simulation result is smaller than that by the empirical formulas,but still within a reasonable limit permitted,indicating that FLAC^3D is an effective way of predicting surface deformation.The research has important reference value for research and prediction of surface deformation caused by other similar mining method.