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为了研究金川镍矿急倾斜矿体利用充填法开采出现的地面沉陷问题,基于三矿区多期地表岩移GPS监测数据,阐明了F17以东地下开采引起地表岩体移动的总体显现特征,在此基础上,分析了出矿量和地表沉陷盆地体积之间的关系,运用ADINA软件,对不同充填开采条件下围岩应力场、位移场变化特征进行了探讨.研究结果表明:三矿区地表沉陷盆地正在形成,其几何形态明显受到控矿断层的控制;当矿体几何形态和采矿方式较稳定时,地表沉陷盆地体积(T)和矿山出矿量(Q)在一定时段内具有一定的相关关系;影响地表沉陷的主要因素是从开采进路形成至充填阶段的围岩收敛变形和间柱的采断;多进路开采较单进路开采条件下的地表沉陷量大.
In order to study the problem of ground subsidence in the mining of steeply inclined orebodies in Jinchuan Nickel Mine, based on the monitoring data of multi-period surface rock movements in the three mines, the general characteristics of surface rock mass movement induced by underground mining in the east of F17 are elucidated. Based on the analysis of the relationship between the amount of ore drained and the volume of the surface subsidence basin, ADINA software was used to investigate the variation characteristics of the stress and displacement fields of the surrounding rock under different filling and mining conditions.The results show that the surface subsidence basin Is forming and its geometry is obviously controlled by the ore-controlling faults. When the geometry and mining mode of the orebody are stable, the volume of surface subsidence basin (T) and the mine output (Q) have a certain correlation in a certain period of time The main factors that affect the subsidence are the convergence and deformation of the surrounding rock during the formation from the mining path to the filling stage and the mining of the millared columns. The multi-approach mining has more ground subsidence than the single approach mining.