不同采宽及充填体对地表沉降的影响

The Influence of Different Mining Width and Filling Body on the Surface Subsidence

某铁矿采用充填法开采,为了减少采矿作业对地表沉降的影响,运用三维数值模拟方法,结合矿体生产实际情况选用不同模型,对矿体及围岩共建立了9种模拟方案,分析了各方案的地表最大沉降值、沉降范围及最大拉应力值的变化规律,最终确定采用采场宽度24 m、灰砂比1∶4这一对地表影响最小的开采方案,为矿山开采决策提供了理论依据。

In order to reduce the underground mining influence on surface subsidence,an iron mine,which was mined by backfilling method,is studied.Different models combined with actual production condition of orebody were selected to establish nine different simulation schemes about orebody and surrounding rock by using 3D numerical simulation method.Each scheme＇s change regulations about surface maximum subsidence,settlement range and maximum tensile stress were analyzed.Finally the mining scheme with the stope width of 24 mand the cement-sand ratio of the backfilling at 1∶4are determined to use.The research provides theoretical basis for mining decision.