Study On The Ability Of Water-Resistance Of Mine Floor Rock-Layers

Based on fracture and elasto-plastic mechanics, the difference of ability of Water-resistance of floor rock-layers combination are studied, the penetrability of natural floor rock-layers and floor rock-layers including faults and cracks are analysed under the effect of mining, the equations of transformation of penetrability of gradient cracks of are given under the effect of gravity and water-pressure. Different angle'faults in different rock-layers combination are simulated by contact elements of ANSYS, according to glide-displace of fault sides under the effect of mining, the effect of fault to the ability of water-resistance of floor rock-layers are analysed; the cracks in floor rock-layers are simulated by singular elements, the difference of ability of water-resistance of floor rock-layers combination are analysed by the change of stress intensity factors and plastic strain of cracks in floor rock-layers under the effect of fault, water-pressure and mining, and growth path of two cracks is gained under the different condition by minimal plastic region theory in combination of numerical simulation, the minimal distance between rock-bridge is given after their fracture. Finally, the ability of water-resistance of floor rock-layers combination are generally evaluated, and ability of water-resistance of floor rock-layers combination of Liu qiao first-mine is evaluated.