Numerical Simulation And Detection Research On Collapse Column Water Activation Under The Condition Of Roadway Drivage

In the process of coal mining water inrush disasters cause huge economic losses to the production, the collapse column water inrush is one of the great harm, also is the most common disasters. Mining damage of rock mass is the leading cause of water bursting and seepage mutations, so the collapse column in mining under the influence of the study of the evolution regularity and mechanism of water inrush, the collapse column water inrush disasters prevention and coal mine safety in production is of important significance and reference value.The paper combining with an instance of roadway drivage , collapse column under the condition of excavation on the basis of the development characteristics and activation mechanism of water transmission, by adopting the combination of theoretical analysis,numerical simulation method, studied the drivage roadway floor of collapse column, and the change rule of the influence of the surrounding rock. Based on limit equilibrium theory and coulomb criterion, this paper derives collapsing column water activation guide criterion and provides the basis for collapse column hydraulic conductivity judgment.According to the different position of collapse column and the working face or roadway, collapse column water inrush form can be divided into the bottom of the pillars of the fall of water inrush pattern and coal pillar wall water inrush pattern. According to the theory of thin plate or shear failure theory respectively, the water inrush model of water inrush criterion is deduced. Seepage from floor of roadway seam collapse column model and calculate permeability area surrounding the collapse column width, the plastic zone surrounding the collapse column width,damage zone depth of floor mining and seepage water inrush criterion is given, which plays an important role in the risk of water inrush prediction of collapse. Three-dimensional fluid-structure coupling mathematical model is established, using the FLAC3D numerical simulation software analyzed the mining collapse column under the influence of seepage field, displacement field, and stress field of surrounding rock of the changes. According to the geological conditions of the mine, formulate reasonable mine transient electromagnetic observation scheme, through the fan form diagram method will get the apparent resistivity section data processing, on the basis of drawing on stope water near collapse column and strength judgment, And in the process of coal mining were analyzed by using numerical simulation,when mining roadway drivage damage is much greater than the collapse column activation, the change rule of water, water inrush detection showed that use of roadway drivage of collapse analysis on the prevention and control of coal seam mining water inrush prediction and guidance significance. This paper proposed "detection collapse column,water inrush comprehensive control technology" the comprehensive prevention and control of water technology. The application of grouting technology in the prevention and control of coal mine water is analysised.