Abstract: Based on porous media fluid-solid coupling theory and elastic-plastic limited equilibrium theory, taken No.-390-1 transverse drift of Baixiangshan iron mine through water conductive fault as an engineering example, numerical model of ort roadway meet large inclined angle water conductive fault was set up, research was done on setting width of water-proof pillar under condition of different lateral pressure coefficient, change rule of stress and strain field of surrounding rock mass under the working disturbance of roadway and the influence rule to stability of roadway surrounding rock mass and water inrush risk were discussed and researched.

Key words: Lateral pressure coefficient, Water-proof pillar, Stability of surrounding rock mass, FLAC3D fluid-solid coupling