Research on the Height and Water in Rush Behavior of Water Conducted Zones in Sandstone Roof Based on FLAC3D Numerical Simulation
With the continuous increase of mining depth,the mining activities of the 1 coal group in Xinji No.2 mine may cause fracture deformation of the overlying thick and hard sandstone layer,which may threaten the safety production of the mine. In order to study the development law of the "upper three zones" and the risk of water inrush under the deep mining conditions of the coal seam in Xinji No. 2 mine,taking 2401 mining area of Xinji No. 2 mine as the research object,a detailed analysis was conducted on the structural geological and hydrogeological conditions of Xinji No.2 mine,and the water filling conditions of the roof aquifer of No.1 group of coal seams were determined;Using empirical formulas and numerical simulation methods,the development height of the water conducted zones during the backfilling process of No. 1U coal seam in 2401 mining area was predicted,and the post mining water inflow was accurately predicted;On this basis,the risk of water inrush from the roof of the coal seam after mining was analyzed. The results showed that the aquifer of the overlying strata of Xinji No.2 mine had little impact on the mining of the 2401 mining area. The main water sources affecting the mining area were the sandstone water in the roof of No.1 group of coal seams and the fissure water in the Taiyuan Formation limestone in the floor of No.1 group of coal seams. The water rich property was affected by the development of faults and fissures,and transient electromagnetic geophysical exploration methods were needed to explore the water rich property of the roof sandstone,delineate the water rich area of the roof sandstone,and conduct advanced detection of the floor limestone to identify the structure and hydrogeological characteristics of the floor limestone. Through research,it is believed that numerical simulation methods can provide a theoretical basis for development height of water conducted zones and predicting mine water inrush and also offer high reference value for coal mine safety production.
water conducted zonesnumerical simulationroof water damageFLAC3DXinji No.2 mine
万方数据
