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中文摘要：
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，留设煤柱所承受的栽荷最大，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．
英文摘要：
Discontinuous deformation analysis （DDA） method is employed to investigate numerically the effects of mining of the work face and nearby work face on the defomlation law of the overlying strata and the leaving small pillars. The failure process of the overlying strata, leaving coal pillars and tunnel are obtained. And the deformation, stress distribution and damage zone under the effects of multi-dynamic pressure are also obtained. With the advance of mining, a semi-elliptical stress field was formed upper the work face. Therefore, the separation layer and key strata was predicted based the stress field. When the mining of down coal seam pass through the corresponding position of leaving coal pillar in upper coal seam, the leaving coal pillar subject to the maximum external load. And the stress release is take place in the mining process, which result in a wide separation layer of upper rock strata and a large area of surface subsidence. Some measures were taken to prevent some geological disasters, such as rock burst and surface subsidence. 7figs.,2tabs., 1 lrefs.
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Experimental study on properties of transverse strain and gas flow of coal containing gas in process
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