复杂地貌多煤层采空区的稳定性评价

Stability evaluation of mine goaf with multi-coal seams and complex landform

针对复杂地形地质条件的多煤层采空区,将概率积分法与数值模拟相结合,对研究区地表移动变形进行了定量计算和分析.根据拟合的时间影响参数预测计算了海拔900 m水平的采空区残余地表移动变形值.应用趋势面分析结合计算机编程,基于FLAC3D建立了多层状、宽缓褶皱的地质体三维模型.地质体的力学参数首先参照岩石力学试验和工程经验给出,通过数值模拟试算使之与概率积分初步计算结果相吻合,从而修正并最终确定.最后运用数值模拟得到研究区的垂向位移、隧道径向和切向应力等.将概率积分法与数值模拟相结合评价采空区的稳定性,综合了地质、采矿等多方面的影响因素.

Aimed at the mine goal with multi-coal seams and complex landform, ground displacement and deformation in the study area was calculated and analyzed quantificationally with the method of probability-integral combined with FLAC^3D simulation. According to the fitting time influencing parameter, the residual value of ground displacement and deformation at the altitude of 900 m was predicted. With the trend surface analysis combined with computer programming, the 3D model of the geologic body having multi-strata and having broad and gentle folds was constructed on FLAC3D platform. The mechanical parameters of the geologic body were presented by rock me- chanical experiments and engineering experience at first. By consulting the value of ground subsidence calculated through the probability-integral, the parameters were modified by tentative numerical simulation. The mechanical parameters of the geologic body were confirmed until the results calculated in different ways were coincidental. Finally, the vertical displacement of the geologic body and the radial stress and the tangential stress of the tunnel were gained by numerical simulation of the whole geologic body. When calculating the ground subsidence of mine goaf, the method of combining probability-integral with FLAC3D simulation can combine many influence factors in geology and mining.