巨厚覆岩下矿产重复开采地表沉陷预测及其控制

Prediction and Control of the Ground surface subsidence Repeated Mining Under Super-thick overlying strata

基于矿区实际勘探资料,建立矿层单独开采与重复开采模型,利用FLAC3D数值软件分别模拟两种采动条件下地表的沉陷特征。模拟结果表明:(1)矿层埋深深且采厚大时,随着采动程度的增加,地表下沉具有缓慢的特点;(2)复合矿层开采时,地表水平移动形态直接是关于采空区中央呈反对称,地表下沉量较单独开采时大。研究成果提供一种矿区地表沉陷预测的方法,并提出系统的治理控制方法,从而降低采矿引起的地表沉陷的损害。

Based on the actual exploration data in the mining area, by using the numerical software of FLAC3D to establish separate mining and repeated mining model, then respectively simulating surface subsidence characteristics under the two mining conditions. The simulation results show that:(1)When the mining depth is deep and the mining thickness is large, the surface subsidence is slow with the increase of mining activity;(2)The surface horizontal movement form is anti-symmetric directly which related to the central goaf when it is repeated mining, and the subsidence is more lager than that of separated mining. The research results provide a prediction method for surface subsidence in mining areas, and propose a systematic control method to reduce damage of surface subsidence caused by mining.