基于FLAC3D分析的某铁矿充填效果研究

为解决辽宁某铁矿开采后地表沉陷问题,验证自研的复合激发尾砂胶结充填体充填效果,运用FLAC3D模拟软件对铁矿二步骤充填开采和地表沉陷进行数值模拟计算研究.研究结果表明:采用3种胶结充填体分别进行二步骤充填后,盐基、碱基、水泥基胶结充填体内部的应力平均值分别为0.92,0.79,0.93 MPa,最大位移值分别为38,2...

Research on filling effect of an iron mine based on FLAC3D analysis

In order to solve the problem of surface subsidence after mining of an iron mine in Liaoning,and verify the filling effect of self-developed composite excitation tailings cemented filling body,the FLAC3D simulation software was used to carry out the numerical simulation calculation on the two-step filling mining and surface subsidence of iron mine.The results showed that after the two-step filling with three types of cemented filling body,the average stress in the salt-based,alkali-based and cement-based cemented filling body was 0.92,0.79 and 0.93 MPa,respectively,and the maximum displacement was 38,22 and 75 mm,respectively,which indicated that the alkali-based cemented filling body had certain advantages in improving the stress environment of stope and reducing the deformation of roof and floor.According to the simulation results of the goaf filling,the alkali-based composite excitation cemented filling body had good support effect on the surrounding rock,which could improve the surface subsidence well.Through the one-year tracking monitoring of stope stress and surface subsidence,it showed that the displacement change of the monitoring area was basically stable,and the change pattern of displacement at the monitoring point throughout the year was the same as the change trend of stress.