Research on water inrush caused by water hammer effect and progressive-lift mechanical model of deep floor
Water inrush from the mine floor is a significant hazard affecting the safe production of deep coal mines.To investigate the complex phenomenon of water inrush from deep mine floors,the characteristics of water inrush incidents in the working faces of the North China region were examined and analyzed.It is found that most water inrush accidents are caused by the combined effects of disturbance stress and water pressure fluid-solid coupling,leading to floor failure.Under certain mining conditions,a dynamic water hammer effect can form in the fracture rock mass channels of the deep mine floor.This effect causes varying degrees of damage or destruction to the surrounding rock of the mining area,which we define as the water hammer water inrush effect.The essence of the water hammer effect in deep rock masses is the instantaneous interruption of water flow in the fracture channels,causing the water to repeatedly cycle and impact within the channel.This repeated cycling leads to damage to the surrounding rock of the fracture channel.When the energy of the repeatedly cycling water accumulates to a certain state,it causes the fracture to expand and break,resulting in a water inrush disaster.Based on this concept,a progressive-lifting mechanical model of deep mine floor water under the influence of water hammer is established,revealing that the water hammer effect in fracture rock masses may promote the formation of water inrush channels.Theoretical and numerical study results collectively indicate that the faster the water flow in the fracture rock mass channels,the greater the instantaneous pressure formed by the water hammer.Under the influence of the water hammer effect,the water wedge effect further drives the progressive-lifting failure of rock mass fractures.Finally,we categorized the types of water inrush from the mine floor under the influence of water hammer into:water hammer-water wedge-induced water inrush from fracture rock masses,stress erosion-fault-induced water inrush from concealed faults,and water inrush from major structural fault conduits.We also proposed control measures for water inrush from deep mine floors affected by water hammer.The water hammer water inrush effect is a new mechanism proposed for water inrush from mine floors,currently in the preliminary discussion stage,aimed at providing some guidance for understanding and controlling deep mine floor water inrush mechanisms.
mining engineeringwater hammer effectprogressive-liftwater wedge actionfracture mechanicswater inrush control
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