一、前言 人们对在有瓦斯突出危险区域的爆破作业存有种种耽心。如,“这种爆破崩落顶板岩石,是否会引起巷道冒顶”;“由于应力分布的急剧改变,也许会使掘进工作面急速破坏”;“受破坏或振动的煤层说不定阻挡不住瓦斯压力”等等。 因此,对爆破后,由于掘进工作面的前移,在各区段所产生的地压变化,特别是起爆后100毫秒内产生的煤层位移量和应力变化值进行了实测。此外,还对动应力作用于煤层时的破坏条件进行了考察。 I. Preface There are many people who worry about the blasting operation in areas with gas outburst danger. Such as “whether such blasting of roof rock will cause roof fall”; “due to the drastic changes in stress distribution, the heading face may be destroyed rapidly;” “damaged or vibrated coal seam may not stop gas pressure” and many more. Therefore, after the blasting, due to the advancement of the heading face, the ground pressure changes in each section, especially the coal seam displacement and the stress change value within 100 milliseconds after initiation were measured. In addition, the damage conditions of dynamic stress on the coal seam were also investigated.