中文摘要：

以大同矿区＂双系＂煤层群协同开采为工程背景,相似模拟实验研究了纵深大区域煤层群开采覆岩位移、裂隙及应力演化分布规律。结果表明：侏罗系近距离煤层群采用刀柱式与走向长壁式开采交错布置方式,形成不同的组合开采模式,表现出不同的覆岩破断特征,应力集中现象突出;石炭系特厚煤层开采致使覆岩大面积垮落,与上部侏罗系煤层群形成了复杂的多层采空区连通状态,且受侏罗系煤柱叠加应力影响,工作面来压频繁、覆岩活动剧烈。纵深大区域煤层群覆岩应力应变形态作为耦合时变系统,随煤层开采经历了＂平衡—失稳—平衡＂循环变化过程。

英文摘要：

In the engineering background of collaborative mining for the Jurassic and Carboniferous coal seam group in Datong mining area, the evolution and distribution laws about displacement, fracture and stress of overlying straod and strike longwall mining method. Different characteristics of overlying strata breaking is presented with different combined mining mode. Overlying strata suffers obvious stress concentration. When Carboniferous extremely thick coal seam is mined, large area goaf is falling of overlying strata appears. Complex connectivity status of multi-layer formed with the upper Jurassic coal seam group. With the stress effect of Jurassic pillar, the pressure of Carboniferous working face appears frequently and lead to strenuous movement of overlying strata. Stress and strain form of overlying strata of the depth and large area coal seam group mining is considered as coupling time-varying ＂ ＂ ＂ n e＂ system, and the system status experiences the cycling variation process of ＂ balance-instablhty-bala c with the coal seam mining.