急倾斜矿体采空区岩移规律相似模拟试验研究

摘要

针对冀东铁矿床赋存特性和地下采空区的特点,开展相似模拟试验研究,分析地下采空区围岩的变形破坏规律.研究表明:随着试验的进行,采空区两侧围岩位移量的差值逐渐增大,围岩应力平衡受到破坏;围岩位移量随时间的变化共分三个阶段:剧增、缓增和剧增;其中缓增阶段历经时间最长;上盘围岩下沉方向指向采空区,下盘围岩下沉方向竖直向下,位移变化趋势呈由上向下水平分层递减.该研究结果为有效地进行急倾斜硬岩矿体开采研究提供了参考.%According to occurrence characteristics and goaf area features of iron ore deposits in East Hebei Province , the similar simulation tests were conducted to analyze the deformation and failure laws of surrounding rock in goaf area .The resluts showed that with the increase of displacement difference between two sides of the goaf , the stress balance of surrounding rock was gradually bro-ken.It could be concluded there were three stages of displacement changes , including a rapid in-crease , a slow increase and another rapid increase .But the slow increase stage lasted the longest time.The hanging surrounding rock subsided toward the goaf area , while the footwall surrounding rock subsided downward vertically .The subsiding displacement showed a decreasing variation tend-ency layer by layer .The study provided a significant reference for effective mining of steeply in-clined hard-rock.