中文摘要：

针对处于相对平衡状态的废弃采空区上覆围岩重新＂活化＂,使裂隙带岩体再压密、地下残留空隙再冒落,导致地表产生二次移动和变形的问题,通过对采空区建筑物地基稳定性综合评价,得出主要考虑煤层的客观因素和外界扰动因素两方面是导致地表产生二次移动和变形的主要原因。从客观因素中煤层赋存条件中的煤层埋深、煤层厚度、煤层倾角、松散层厚度入手,采用FLAC3D软件对煤层埋深、煤层厚度、煤层倾角、松散层厚度等因素对采空区建筑物稳定性进行分析,结果表明：随着开采深度的增加,地表及地表附近岩层的移动变形受开采的影响减弱,开采深度的增加对建筑物地基的稳定有利;随着开采厚度的增加,开采对上覆岩层的破坏程度明显增大,移动过程表现得也越剧烈,地表移动变形值也越大,开采厚度的加大对废弃采空区建筑物地基的稳定不利;煤层倾角的增大增加了地表移动的时间,增大了地表的不稳定性;松散层在覆岩中所占的比例越大,地表的移动范围就相对越大,增大了地表的不稳定性。

英文摘要：

The wall rock on abandoned and in relative balance state goaf activate again,it makes the fracture zones press dense again and underground residue gap collapse again,which lead to the secondary surface movement and deformation,through the comprehensive evaluation of foundation stability of goaf,it concludes that the coal seam objective factors and external disturbances are the leading causes.From the objective factors of current condition of coal seam,By Using FLAC3D,this paper mainly analyzes the influence of seam depth,seam thickness,seam dip angle and unconsolidated layer thickness on foundation stability of goaf.the results show that,the effect on movement and deformation of surface and rock stratum decreases with increasing mining depth,the increase of the mining depth is favorable to foundation stability of goaf;the destruction degree of the wall rock increases obviously,the violent surface movement and the surface deformation increases with increasing mining thickness,the increase of the mining thickness is unfavorable to foundation stability of goaf;the surface movement time increases and the surface stability decreases with increasing seam dip angle;the surface movement scope is increased with the increased proportion of unconsolidated layers in overlying strata.and then the foundation stability of goaf is decreases.