宁都硫铁矿近地开采稳定性理论与监测综合评判分析

宁都硫铁矿采用房柱法开采，地面标高为+240 m，最上开采中段标高+190 m，开采最上中段距地表不过50 m，矿山开采以来未采取充填、加固的治理措施.针对矿山的开采是否造成上覆岩层失稳，地表沉降是否可以预测，实际监测沉降量是否在可控范围内等问题.采用关键层及岩层破坏极限跨距理论进行岩层稳定性分析，结果显示采场跨度在8 m的条件下，上覆岩层稳定.采用灰色系统预测模型进行对比分析，结果显示预测沉降值与实际监测沉降量基本一致，表明具有可信性，可应用于沉降预测.根据矿山实际情况，进行了长期的地表沉降监测，编制变化曲线图，结果显示矿山开采造成了沉降，沉降值在可接受范围内，但必须引起足够的重视. 

The stability theory and monitoring comprehensive evaluation analysis of near-surface mining in Ningdu pyrite mine

Ningdu pyrite is mined by the column-and-pillar method with a ground elevation of +240 m and an elevation of +190 m at the middle of the upper mining section. However, the upper middle section of the mining area is no more than 50 m above the ground surface and no filling and reinforcement measures have been adopted since the mining.The stratum stability analysis of the stratum with the critical layer and the failure limit span of rock strata is carried out. The result shows that the stratum overlying stratum is stable under the condition of 8 m span.The result shows that the overlying strata is stable under the condition of 8 m stope.The gray system prediction model is used for comparative analysis. The results show that the predicted settlement value is basically consistent with the actual monitoring settlement value, indicating that it is credible and can be applied to the settlement prediction.According to the actual situation of the mine, long-term surface subsidence monitoring was carried out and the change curve was compiled. The result shows that the settlement of the mine resulted in settlement within the acceptable range, But it must attract enough attention.