Disaster Mechanism And Risk Prediction Of Floor Water Inrush In Fault Development

In the process of coal mining,the water pressure of the aquifer is the power source of water inrush from the floor.The aquifer is a"barrier" to restrain the pressure water of the floor to enter the working face,and the floor as a discontinuous structure often associated with various fractured structures with different forms and different sizes,so the distribution of stress distribution in the mining process of the fracture structure development floor is systematically analyzed.It is of great theoretical and practical significance to prevent water inrush from coal seam floor effectively and ensure safe production of working face.On the basis of referring to the relevant literatures,the paper firstly divides the fracture structure of the bottom plate into two types.Because of the differences between the two types of fissures in the development pattern and the research methods selected,the emphasis of the research content is also slightly different.The main conclusions are as follows:(1)Using the theory of elastic mechanics and fracture mechanics,the mechanical model of water inrush in the fracture development region of the seam floor of the coal seam type floor is derived.(2)Using the two dimensional similar material test platform and the self-made pressurized water guide system,the stress evolution law,the law of fracture development and the bearing water conductivity characteristics of the bottom floor of the bottom floor of the boundary coal pillar the middle floor of the goaf and the bottom of the coal pillar under the fault protection pillar are systematically divided in the process of advancing the floor with the floor bearing fault.(3)The FLAC3D numerical simulation software is used to study the stress distribution,the distribution characteristics of plastic zone,the distribution characteristics of the pore pressure and the change of the displacement of the whole floor rock stratum in the aquifers under the effect of the multi effect field,and then on the basis of this,the 2 different kinds of combined fractures are analyzed in the mining process.The effect of water inrush behavior.(4)The PCA method of multivariate statistical theory is used to reduce the dimension of the sample data,and then the probability prediction model of water inrush from the floor is established by using the extracted score as the intermediate variable.