基于流固耦合的矿井深部煤层底板采动破坏特征及突水机理

o research the damage characteristics and water-inrush mechanism of mining of floor in the deep area and the difference between the mining in the shallow area, the floor of lower group coal in Huaibei mining area has been set as study object and three floor models of different mining depths have been established. FLAC3D has been developed on the basis of FISH language and the damage characteristics in mining of floor of different depths under fluid-structure interaction have been analyzed and compared comprehensively. The study results show that the damage form of floor in deep area after mining is quite different from the one in shallow area. In-situ tensile fracture would develop on the roof of aquifer under coupling of high crustal stress and confined water of high pressure in deep area. What's more, progressive intrusion would happen under the influence of mining, while there is no such phenomenon in the shallow mining. Water inrush disaster may happen while the damage zone caused by mining connected with the progressive zone. The results show the damage characteristics of mining of floor in deep area and the mechanism of water inrush.