中文摘要：

为分析某大型地下采场开挖稳定性,利用FLAC3D计算开挖过程中的变形和破坏情况,对比分析空区是否贯通2种方案下采场的应力-应变响应。研究结果表明：两者应力分布形式基本相同,且数值也大体相同。在空区以内2种方案得到的位移等值线云图的分布形式基本相同,但其位移有较大差别,大约为25 cm。在主采区和2采区贯通处,2种方案的位移形态有较大差别,方案1的位移趋势指向空区的拐角处,而方案2的位移趋势指向空区内部。各监测点位移曲线的分布形式基本相同,即先增大再减小的趋势。方案1的位移大于方案2的位移,是否开挖中部2采区520分段空区和中部2采区500分段空区对顶板沉降的影响较大。2种方案的塑性区分布基本相同,即沿着空区中央以弧状形式不断向外发展,但方案1空区顶板的破坏区域大于方案2空区顶板的破坏区域。

英文摘要：

In order to study the three dimensional stability of one large underground stope after excavation,the numerical simulation software FLAC3D was used to calculate the deformation and failure situation of the surrounding rock mass.The calculations were done for two cases of whether penetration taking place in the goaf.In the calculation,the effects of penetration of excavation areas on the stability of stope were analyzed.The results show that in the stress field,distribution modes of stress for these two cases are the same as the magnitude;in the displacement field,the distributions of displacement contour lines are nearly the same as in the areas of stope,but the magnitudes are different for about 25 cm.At the location of penetration in main stope and 2 stope,the displacement modes of these two cases are very different.In case 1,rock mass moves to the corner of stope while in case 2,rock mass moves to the inner of stope.The distribution of displacement for each monitoring points are nearly the same,which increases first then decrease along the monitoring lines.The magnitude of displacement for case 1 is larger than that for case 2.So the penetration has large impact on the sedimentation of roof.In the field of plastic zones,the distribution of these two cases are nearly the same,which develop from the center of stope to the outer on the arc shape,and the failure height of the case 1 is larger than that of case 2.