Sensitivity Analysis of Factors Affecting Asymmetric Deformation of Roadways in Steep Inclined Coal Seam

Abstract

There isn`t clear definition of steep inclined coal seam at home or abroad at present. Generally,the inclined coal seam with 35°~55° inclination is called steep inclined coal seam in mining field [. During the mine program in steep inclined coal seam,due to its special formation of roof and floor,not only perpendicular pressure to coal seam is distinct,but also the component of gravity along the direction parallel to coal seam is significantly increased and the parallel pressure which causes slippage of roof and floor is the main factor resulting in the distinct roadway transformation. Uncertainty and asymmetry transformation or destroy of roadways brings great difficulties to the mine of steep inclined coal seam,especially for the asymmetry transformation which is a huge challenge to the support of roadways,so it`s necessary to summary and analyse the factors affecting asymmetry transformation of roadways in steep inclined coal seal. Through classifying these factors by the main and secondary,this paper will provide reference for reasonable arrangement of roadways and effective support scheme in steep inclined coal seam. Many scholars did some research in laws of roadway deformation in steep inclined coal seam,but few of them compared or did sensitivity analyse of these factors. Zhang Bei etc. built the numerical simulation models of roadways with different inclination and found the key position of the deformed surrounding rocks [;Sun Xiaoming etc. aimed at the asymmetric deformation of surrounding rock around deep roadways and investigated its failure mechanism and coupling control countermeasure [;Cao Shugang etc. analysed the stress distribution rules of roadways in steep inclined and medium coal seam by ADINA program and put forward some control measures [. In different inclination conditions, this paper simulates asymmetry deformation of roadways with different section form in steep inclined coal seam through FLAC3D program and analyses the sensitivity of these factors affecting asymmetric deformation.