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为了尽可能地避免上、下采空区的贯通,采用了数值模拟的方法,针对不同煤层间距下,随着采空区下工作面的不断推进,研究上覆岩层的离层空间、动压显现特征以及“三带”裂隙高度。模拟结果表明,随着煤层间距不断增加,在工作面上方顶板岩层中的拉伸破坏单元逐渐的增多,加剧了采空区下坚硬顶板的垮落和断裂,同样减小了顶板的断裂步距。
In order to avoid as much as possible through the upper and lower goaf, using numerical simulation method, for different coal seam spacing, with the continued promotion of the work surface under the goaf, study the overlying strata space, dynamic pressure Show features and “three zone ” crack height. The simulation results show that with the increase of the coal seam spacing, the tensile failure units in the roof strata above the working face gradually increase, which aggravates the caving and fracture of the hard roof under the goaf and also reduces the fracture step of the roof .