程潮铁矿深部矿体联合开采地表沉降规律研究

程潮铁矿选厂位于该铁矿深部矿体之上，采用2种采矿方法联合开采-430~-500 m阶段矿体时会引起选厂区域地表沉降。应用数值分析相关理论，建立采矿模型，采用FLAC3D有限差分法软件对开挖进行数值模拟，根据模拟结果分析地表沉降规律，从而预测是否要搬迁地表选厂，并根据不同情况提出相应的预防措施。结果反映地表选厂区域受地下开采沉降较大，影响选厂正常生产及选矿车间构建筑物的安全，且选场区域沉降与开采深部矿体间水平距离呈现一般规律，因此建议搬迁选厂。

Study on the Surface Subsidence based on Combined Mining of Deep Orebody in Chengchao Iron Mine

The dressing-plant of the Chengchao iron mine is located on the deep ore-body,and surface subsidence may be caused with combination of two mining methods to cave the orebody between -430 m and -500 m.Mining model is established on the basis of numerical analysis theory,and the excavation process of the model is simulated by using finite difference software FLAC3D.Surface subsidence regularity is obtained according to the simulation to predict the relocation of dressing-plant and propose appropriate preventive measures according to different situations.The results reflect that the influence of underground mining on the subsidence of dressing-plant area is large,thus affecting the normal production of dressing-plant and the safety of workshop buildings.The general rules of the relationships between the surface subsidence of dressing-plant area and the horizontal distance to cave deep ore-body have been carried out.It is recommended to relocate the dressing-plant.