Study On Stability Of Roadway Floor Under High Confined Water Condition In

For a long time, the exploitation of resources is seriously affected by the water inrush in mining. The research in water inrush is related to mining engineering, engineering geology, hydrogeology, rock mechanics, rock hydraulics, fluid mechanics. In this thesis, the mechanism of mine water inrush and waterproofing and drainage methods are both discussed based the researching on the stress field of rock seam floor and the deformation characteristics. Besides, a theory is proposed to replenish the mining theory with a certain theoretical and practical significance.There is still no a sound theoretical and design specifications in the field of underground mining of metal mine. Because of the problems of underlying and the seam layer overlying in coal mining, The theory is relative well in coal mining area. In order to study the impact of roadway excavation stability under conditions of confined water and to determine the thickness of the seam floor impermeable layer, referencing formulas and theories related to the field of coal, the analytical solution of the seam floor impermeable layer thickness is calculated based on the results of rock mechanical experiments, the survey data of roadway jointed structure and the survey results of confined water layer site. Then the stability analysis model of roadway excavation is established which is used to analysis roadway mining process, confined water seepage and influence of rock fracture stability of the roadway via combining the calculation software of FEM coupling seepage field and stress field. Finally,the thickness of impermeable layer is verified.