School of Resources and Safety Engineering, China University of Mining and Technology (Bejing)

构造突出煤层中瓦斯压力梯度变化规律与水平地应力分布规律是影响煤与瓦斯突出的主要因素,建立了煤层瓦斯压力梯度与水平地应力定量计算模型;以坦家冲矿236-80北石门附近区域构造突出煤层为研究对象,由FLAC模拟可知,水平地应力趋近于0的区域煤体破坏最为严重;由计算可知,当水平地应力约为3 MPa时,构造突出煤层中瓦斯压力梯度会出现突变;当水平地应力大于3MPa时,沿煤层物理模型走向0~5与42~62 m两个区域瓦斯压力梯度急剧增加。

The gas pressure gradient variation law and the horizontal ground stress distribution law of the tectonic outburst seam would be the major factor affected to the coal and gas outburst. A quantitative calculation model of the seam gas pressure gradient and horizontal ground stress was established. Taking the regional tecto nic outburst seam near No. 236-80 north cross-cut in Tanjiachong Mine as a study object, the FLAC simulation result showed that the seam failure was serious in the re gion with horizontal ground stress approached to zero. The calculation showed that when the ground stress was about 3 MPa, the gas pressure gradient in the tectonic seam would have a sudden change. When the horizontal ground stress was over 3 MPa, the gas pressure gradient would rapidly increase in the two regionsof0~ 5 m and 42 ~ 62 m along the strike direction of the seam physical model.