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随着开采深度的不断延伸,地应力在煤与瓦斯突出中的作用越来越显著。运用理论分析、数值模拟和现场调研的方法,探讨了现代构造应力场作用下断层走向对瓦斯突出的影响。结果表明,构造演化和断层走向与现代构造应力场最大主应力方向的关系控制着煤与瓦斯突出危险性。断层走向与最大主应力平行时,利于应力释放,煤层透气性较好,突出危险性小,但断层歼灭端特别是断层下歼灭端出现应力集中,瓦斯保存条件相对较好,需预防瓦斯事故;随着断层走向与主应力方向夹角的增大,挤压剪切应力集中范围随之增大,突出危险范围也随之增大;断层走向与最大主应力垂直时,挤压剪切应力大范围集中,煤层渗透性低,有利于形成大的瓦斯富集区,突出危险性最大。
With the continuous extension of mining depth, the role of geostress in coal and gas outburst has become more and more significant. By using the methods of theoretical analysis, numerical simulation and on-site investigation, the influence of fault orientation on gas outburst under the influence of modern tectonic stress field is discussed. The results show that the relationship between tectonic evolution and fault orientation and the direction of maximum principal stress in the stress field of modern tectonics controls the danger of coal and gas outburst. When the strike of fault is parallel to the maximum principal stress, the stress release will be beneficial to the coal seam. The gas permeability of the coal seam is good and the prominent danger is small. However, the stress concentration occurs on the annihilating end of the fault, especially on the annihilating end under the fault and the methane gas storage conditions are relatively good. As the angle between fault strike and principal stress increases, the concentration range of compressive shear stress increases with the increase of the critical danger range. When the fault strike is perpendicular to the maximum principal stress, the extrusion shear stress is large Concentrated range, low permeability coal seam is conducive to the formation of large gas-rich areas, highlighting the greatest risk.