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为了预测姚家山矿首采1(4+5)01工作面回采过程中煤与瓦斯突出危险,建立力学模型,理论分析了水平应力σ_x与支承应力σ_v之间的关系。通过数值计算,得到煤壁内单元煤体的支承应力变化规律,得出工作面的支承应力的最大值出现在中部,为73.46 MPa,最小值出现在工作面靠近两侧煤巷的位置,为56.21 MPa,靠近工作面顺槽两侧的单元煤体更容易发生突出初始破坏;代入公式计算得到若要工作面煤壁内单元煤体不发生突出的初始破坏,煤壁内水平应力的变化和数值不能超过41.97 MPa。
In order to predict the danger of coal and gas outburst during the first mining of 1 (4 + 5) 01 working face in Yaojiashan Mine, the mechanical model was established and the relationship between horizontal stress σ_x and supporting stress σ_v was theoretically analyzed. Through the numerical calculation, the variation law of the bearing stress of unit coal in the coal wall is obtained, and the maximum value of the bearing stress of the working face appears in the middle, which is 73.46 MPa. The minimum value appears at the position of the coal lane close to both sides of the working face. 56.21 MPa, the unit coal near the working face along the groove is more likely to have prominent initial failure. Calculated by the formula, if the initial failure of unit coal in the coal wall of the working face does not occur and the horizontal stress in the coal wall changes and The value can not exceed 41.97 MPa.