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基于Lippmann H煤层失稳的基本理论,考虑巷帮侧瓦斯压力分布及支护阻力的作用,运用Mohr-Coulomb准则建立了适用于顶底板为岩石的全煤巷的煤层平动突出模型,并得到了含瓦斯煤层整体失稳前应力分布、塑性区及扰动深度的解析式。结合某两矿区的实际生产情况,得到了其煤层应力分布曲线,验证了该模型的准确性。在煤层平动突出模型基础上,对塑性区宽度的影响因素进行了分析和探讨。结果表明:塑性区宽度受巷道宽度影响较小,其随着巷道高度的增加而不断增大;地应力和瓦斯压力越大,参与突出煤层的长度则越大;通过提高煤体强度和优化支护方式,能够降低煤层发生冲击失稳的危险。
Based on the basic theory of Lippmann H coal seam instability and considering the effect of gas pressure distribution and supporting resistance on the side of coal seam, a coal seam translation model for coal seam with rock roof and floor is established by using Mohr-Coulomb criterion. The analytical formula of stress distribution, plastic zone and disturbance depth before the overall instability of gas coal seam is included. Combined with the actual production situation of a certain two mining areas, the stress distribution curve of coal seam is obtained, which verifies the accuracy of the model. On the basis of the coal seam translation model, the influencing factors on the width of plastic zone are analyzed and discussed. The results show that the width of the plastic zone is less affected by the width of the roadway, which increases with the increase of the height of the roadway. The larger the ground stress and the gas pressure, the greater the length of the protruding coal seam. By increasing the strength of the coal body and optimizing the branch Protection, can reduce the risk of coal seam instability impact.