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应用不连续变形分析(DDA)方法模拟分析了邻近工作面开采和本工作面开采对上覆岩层及留设小煤柱的变形影响规律,再现了上覆岩层、留设煤柱及巷道的变形破坏过程,获得了小煤柱巷道在多次动压影响下的变形量、应力分布和破坏范围.随着开采的推进,工作面的上方会形成半椭圆形的应力场,由此可预测采空区上覆岩层的离层及关键层的形成.当下煤层开采通过邻近上煤层所留设煤柱对应位置时,留设煤柱所承受的载荷最大,在回采过程中可产生很大的应力释放,导致上覆岩层有大范围的离层,并由此引发地表大面积沉陷.此时要注意防范诸如冲击地压及地表沉陷地质灾害事故的发生.图7,表2,参11.
The influence of adjacent working face mining and the working face mining on the deformation of overlying strata and remaining small coal pillars was simulated and analyzed by the method of discontinuous deformation analysis (DDA), and the deformation of overlying strata, remaining coal pillars and roadway was reproduced The failure process and the deformation, stress distribution and failure range of small coal pillar roadway under multiple dynamic pressure are obtained.With the advance of mining, the semi-elliptical stress field will be formed above the working face, The formation of the strata and key strata of the overburden strata in the open area When the current coal seam is mined through the corresponding position of the coal pillar left in the adjacent upper coal seam, the left coal pillar can bear the largest load and can generate a great stress in the recovery process Release, resulting in a wide range of overburden strata, and the resulting surface subsidence caused by large area. At this time to pay attention to prevent such as rock burst and surface subsidence geological disasters occurred Figure 7, Table 2, Senate 11.