The Plastic Damage of Surrounding Rock Under the Influence of Confined Water Pressure and Mining Disturbance With Fluid-solid Coupling Analysis

The article simulates rock plastic damage change situations under the influence of different mining disturbance scope, different aquifers and fault water pressure through identifying the area of plastic damage function F′≥ 0, by using "Dynamic" model mining space in Comsol4.2a multi-physics coupling software. The results showed that the plastic damage scope in stress concentration zone where was formed by mining disturbance was greater than the mining floor, and with an extension of the scope of mining, the scope of plastic failure zone in the rock surrounding including the vertical and horizontal was increased; with the increase of water pressure, the surrounding rock mechanical strength decreased, and the increase scope of the plastic collapse, and plastic damage increased within the fault zone.