Abstract The coal goaf areas are the main cause of accidents involving water intrusion in mines. ground collapse caused by poses major threats to further mining as conventional ground-based transient electromagnetic method is difficult perform due hilly terrain Loess Plateau. In this study, a ground-airborne for detecting on Plateau was presented. First, numerical model built using geological d...

The pressure relief of coal pillars in close-distance multi-coal seam goaf is a complex engineering problem with the characteristics “dynamic mine pressure”. Hence, this paper studies such problems. First, influence factors pillar on mining face lower under condition were theoretically analyzed, and it was concluded that vertical stress most important element, followed by horizontal stress. Nex...

After a coal mine is closed, the rock mass could undergo weathering deterioration and strength reduction due to factors such as stress groundwater, which in turn changes bearing capacity of fractured abandoned goaf, leading secondary or multiple surface deformations goaf. Currently, spatiotemporal evolution pattern deformation closed mines remains unclear, there no integrated monitoring predict...

In the process of coal seam mining, there are often hard thick key layers in overlying strata. Due to high strength and good integrity layer, after layer is broken, strata will collapse lose stability a large area, which very easy induce dynamic disasters such as rock burst, mine earthquake, wall caving, roof slab caving. Aiming at working face, response under strong earthquake induced by break...

Stability of the retained goaf-side gateroad (RGSG) is influenced mainly by the movements of the roof strata near coal seam after coalface passes by. To make effective controlling technology for the stability of the RGSG, we analyze the roof structure over the RGSG to illustrate the mechanism causing the RGSG instability under different roof conditions. We then examine the dynamic evolution of ...