基于离散单元法的东风煤矿采空区稳定性评价

Goaf stability evaluation in Dongfeng Coal Mine by discrete element method

针对晋北地区东风煤矿采空区易引发地质灾害问题,通过对区域概况、矿区地质与水文地质条件、模拟评价及分析,结合地表勘查与DEM图像进行沉降分析,采用离散单元法对晋北地区东风煤矿采空区进行数值模拟,获得某一典型块体位移曲线,并进行了位移边界条件研究,得出了水平位移和垂直位移曲线呈波浪起伏状,最大位移分别为1 360 mm和4 510 mm,块体受力作用比较明显,水平时步迭代约58 000步后趋于稳定的结论,对其采空区稳定性进行了准确评价。该方法可以应用至其他类似采空区,对于指导该区煤炭资源合理地可持续开采、减少由此引起的地质灾害的产生具有重要的理论指导意义。

The goaf of Dongfeng Coal Mine easily occur geological disasters. Through the analysis of the regional situation,the geological and hydrogeological conditions,simulation evaluation,combined with the exploration of surface settlement analysis and DEM image,the numerical simulation was carried out in goaf of Dongfeng Coal Mine by using discrete element method,by a a typical block displacement curve was obtained,relevant displacement boundary conditions were also studied. The results showed that,the horizontal displacement and vertical displacement curve showed wave shape,the maximum displacement is respectively 1 360 mm and 4 510 mm,the block force is clear,level iteration about 58 000 steps after the conclusion of the stable. The assessment of the stability of mined area was accurate.The method can be applied to other similar mined out areas,which has important theoretical significance for guiding the rational sustainable exploitation of coal resources in the area and reducing the occurrence of geological disasters.