Water Disaster Model And Prevention Countermeasures In Mining Areas With Extremely Complicated Hydrological Geological Conditions

With the increasing depletion of shallow coal seam resources,the development of coal resources in China has gradually entered the era of deep coal mining.The mining of deep coal seams will face the complex geological conditions of high ground stress,high temperature,high karst water pressure,strong mining disturbance and multiphase and multiphysical field coupling.All kinds of new problems and new characteristics of water inrush will gradually emerge,showing different hydrogeological laws from medium deep mining and shallow mining.How to ensure the safe mining of deep coal seams has become a practical problem that must be taken seriously in the prevention and control of high pressure and large mining depth mines.Therefore,based on a large number of previous water inrush cases in Fengfeng mining area,this thesis divides the water inrush types by single factor,summarizes the water inrush modes by multiple factors,studies the water inrush process of typical mines with the help of computer simulation technology and similar material simulation experiments,puts forward targeted prevention measures based on the specific outburst mode,and obtains the following research results:(1)Based on the analysis of 72 water inrush cases in Fengfeng mining area over the years,the water inrush types are divided by single factor and the water inrush modes are summarized by multiple factors.According to the supply source of water inrush source,the spatial relationship between mining coal seam and water inrush aquifer and channel,the water inrush types are divided into 7 major categories,28 subcategories and50 types;At the same time,various factors causing disasters are systematically summarized,and the manifestations of water inrush are analyzed from multiple angles.Based on the different key disaster causing factors,nine water inrush modes are summarized,and combined with typical water inrush cases,the main characteristics and mechanism of water inrush modes are clarified.(2)Based on the fluid solid coupling theory and FLAC^3D numerical simulation software,the numerical simulation models of coordinated water inrush of complete rock zone fracture and fault progressive lifting,and coordinated water inrush of complete rock zone primary fracture expansion and fault seepage lifting are established.Through the variation laws of stress,displacement and confined water pressure of floor complete rock zone,aquiclude primary fracture and fault zone,The disaster mechanism of through fault water inrush model and primary fracture expansion water inrush model are studied respectively.(3)Taking 15252N working face of Jiulong mine as the geological background,the water inrush mode of primary fracture expansion of coal seam floor waterproof layer is studied through the self-developed simulation test system for the similarity of primary fracture expansion and fault seepage conductivity of coal seam floor waterproof layer,so as to truly reproduce the wedge splitting,scouring,softening and softening of confined water on fault zone,primary fracture and floor fracture zone In the process of forming water inrush channel by fracturing expansion,the cooperative water inrush mechanism of primary fracture propagation and penetration of floor water resisting layer and seepage and lifting of confined water is analyzed.(4)Based on the classification of water inrush types and the induction of water inrush modes in Fengfeng mining area,combined with the geological and hydrogeological conditions of water inrush mines,the concept of water prevention and control in medium mining depth is improved and innovated,the concept of water prevention and control in deep mines is put forward,and a set of comprehensive prevention and control measures suitable for mining under pressure under the conditions of high water pressure and large mining depth in Fengfeng mining area are constructed,Based on the specific water inrush model in Fengfeng mining area,different water prevention countermeasures are put forward.