正断层下盘工作面开采覆岩离层演化规律

Normal Fault Footwall Face Mining Strata Abscission Evolution

针对断层存在条件下,采用相似材料模拟试验研究了断层影响下离层空间的演化过程,分析了离层空间的层位演化和横向扩展规律。研究表明:在断层未活化前,岩层组合失稳运移形成离层,并随着工作面的推进,离层层位高度不断上升;当断层活化后,覆岩发生剧烈运动,导致离层层位高度急剧增大,此后随着工作面的推进直至揭露断层,离层层位高度不在增加;离层的横向跨度,直至断层活化前随着工作面的推进不断增加,当离层的跨度扩展至断层处,由于断层的阻隔作用,离层横向跨度不在变化。

For fault existing conditions,the similar material simulation test study on the evolution process of abscission layer under the influence of fault space,analyzes the horizon of abscission layer space evolution laws and lateral extension. Studies show that the fault before activation,strata combination form abscission layer instability of migration,and with the working face advancing,rising from the layers of a highly; After the fault activation,strata intense movement occurs,leading to a sharp increase is seen from the layers of a highly,along with working face advancing until reveal faults,from layers of a height not increase; Before the transverse span of abscission layer until fault activation with increasing working face advance,when the span of abscission layer extended to Duan Ceng Chu,due to the fault block,abscission layer transverse span is change.