Experimental Study On The Characteristics Of Coal Mine Floor Water Inrush Under The Combined Action Of Mining And Pressurized Water

Mine water inrush water disasters of coal mine safety mining in our country has been facing a big problem. With the strength of the mining depth increasing and mining, the mining environment is more and more complicated and mine flood problem is becoming more and more serious.In this paper, the deep-seated ground pressure and the complex environment brought by pressurized water pressure are analyzed by theoretical analysis, numerical simulation, indoor test and so on.According to the previous research results, the formula of crack initiation criterion is deduced to reveal the dynamic mechanism of floor water inrush. On the basis of the mechanism of the fracture of the floor rock mass, through the theoretical derivation, the formula for calculating the failure depth of the coal seam floor is obtained. On the basis of this,the calculation model of the bottom plate failure under the action of high confined water is established, and the formula of stress component formula is analyzed.In order to study whether the seepage field and the stress field under the action of high water pressure and the failure zone of the coal seam floor can communicate, and the characteristics of the process of high pressure floor failure and water inrush channel formation and evolution,the COMSOL software is used for numerical simulation to explore the occurrence of water inrush from the floor and the nature of the aquifer,water pressure and other factors corresponding relationship.Based on the comparative analysis of the influence of different water pressure and water quality on the seepage velocity field, stress field, displacement field, failure depth, seepage pressure field and velocity distribution under the vibration properties of different water pressure and the nature of the aquifer, it can obtained that water pressure increases, the seepage velocity increasing, the floor displacement and damage depth increases,the pressure of water pressure is larger and the seepage velocity The greater the thickness of the bottom plate and the greater the depth of damage; the greater the thickness of the aquifer, the greater the seepage flow rate of the bottom plate, the greater the displacement and the depth of the bottom plate, the more prone to water inrush.Based on the influence of deep geologic tectonic mechanics environment and similar materials seepage and other factors, the new fluid-solid coupling of Vaseline, paraffin as cement, calcium carbonate and sand as aggregate and anti-wear hydraulic oil was developed. The physical model of deep mining under the influence of confined water is established, and the variation law of rock mass stress and seepage is studied in coal seam floor.The results show that the permeability of the rock mass shows the regional and temporal properties under the periodic variation of the bottom of the mining coal seam. The distribution of the high permeability area in the bottom plate is inhomogeneous, which occurs first in the open direction. The permeability variation of rock mass far away from the mining area is with a lag.