Determining Young's Modulus of Fractured Coal Rock Mass through a Homogenization Method

摘要

Three main fractures exist in coal rock mass, including face cleats, butt cleats, and major fractures. The distribution of cleats and beddings in coal rock mass likes a regular reticular. A geological model was established without considering the major fractures. Young's moduli of fractured coal rock mass were gained through a homogenization method monolayer composite micromechanics analysis method. The relations between volume fraction or Young's moduli of cleat and Young's moduli of coal rock mass were investigated by calculation. Results shown that Young's moduli of coal rock mass have the same change trends with the increase of volume fraction of cleat in the interval of 0.001-8mm of width of cleat. And the width of cleat of 0.5mm is a critical point. Young's moduli of coal rock mass monotonically increase with the increase of Young's modulus of cleat in the interval of 0.001-0.008GPa. Volume fraction and Young's moduli of cleats have notable effects on Young's moduli of coal rock mass.