Analysis and research on the linkage mechanism between water inrush from separation layer and strong ground pressure

Yu Yang

doi:10.19896/j.cnki.mtkj.2025.06.029

Abstract：Shaanxi Guojiahe Coal Industry Co.,Ltd.is located in the Huanglong Jurassic coalfield.It is a mine with complex hydrogeo-logical conditions and rock burst.The main mining target,the extra-thick No.3 coal seam,is buried deep,and roof bedding water disas-ters have occurred repeatedly during mining,posing a serious threat to the mine's safe production.Based on this,in response to the fre-quently occurring coupled disasters of roof water inrush from separation layers and strong mine pressure in fully-mechanized top-coal caving mining of extra-thick coal seams,physical simulation experiments,ground pressure monitoring,microseismic analysis,and dy-namic water level analysis were employed to study the linkage mechanism and disaster-causing laws of water inrush from separation lay-ers and strong ground pressure.The results indicate that after the fracturing and instability of the key water-resisting strata during the uphill mining stage in anticlinal area,confined water flows bidirectionally along the water-conducting fracture zones and the separation layer spaces,triggering periodic water inrush and support crushing;the fracture angle of the strata in the axial part of the syncline is close to 90°,and after water filling in the bedding separation,the load transfer mode of the overlying strata changes,leading to a sharp increase in support load.Before water inrush,the water level in the long-term observation hole decreases in a step-like manner,and the microseismic energy and frequency exhibit synchronous anomalies.The time-domain variation characteristics of the two are consistent,making them suitable as early warning indicators.The coupling effect of the ground stress field and seepage field induced by the mining of extra-thick coal seams forms a combined disaster mode of roof-bedding water inrush.The research results can provide theoretical and technical support for the prevention and control of bedding water inrush in mines with similar conditions in Huanglong coalfield.