摘要:Coal wall mechanical environment of high cutting face in steeply dipping seam is complex, which might become instable, in order to better prevent and control coal wall instability, it is urgent to gain a clear idea of coal wall mechanics and deformation features. The coal wall mechanics, deformation features of 25221 high cutting face in steeply dipping seam are analyzed by field measurement, numerical calculation and theoretical analysis, results show that, abutment pressure in space affects high coal wall of steeply dipping seam in the form of asymmetrical arch shell and decreases gradually in the form of curve in face advancing direction; non uniformity advance abutment pressure leads to asymmetric deformation of coal, within the range of 0~13m ahead the face, the horizontal displacement value of middle part>lower>upper, that of over 13m is middle>upper>lower, that over 14�48m is middle>lower>upper, the middle part has the maximum displacement and deformation value, coal wall instability rate of the middle part is largest; as mining height increases, the degree of advance abutment pressure concentration, coal deformation, displacement and large deformation range will all increase.%大倾角大采高工作面煤壁力学环境复杂,煤壁极易失稳,为更好防控煤壁失稳,亟待弄清工作面煤壁力学、形变特征。采用现场实测、数值计算、理论分析等方法对25221大倾角大采高工作面煤壁力学、形变特征进行分析。结果表明:超前支承压力在空间上以非对称拱壳形态作用于大倾角煤壁,在工作面走向以曲线形式逐渐降低;非均匀性超前支承压力使煤体发生非对称形变,水平位移量在工作面前方约0~13m范围内表现为中部>下部>上部,13m后则表现为中部>上部>下部,垂直位移在0~14�48m范围内表现为下部>上部>中部,14�48m之后位移量表现为中部>下部>上部,中部位移变形量最大,则中部区域煤壁失稳几率最大;采高增大,超前支承压力集中程度,煤体形变、位移量及大变形范围都会增大。