Abstract

The paper expounds the characteristics of coal and gas outburst in Baijiao Coal Mine, discusses the formation, classification and influences on coal and gas outburst of interlayer-slip structures with examples. It points out that coal and gas outburst in Baijiao Coal Mine can be divided into four categories (sudden dumping of coal, sudden pressing of coal, coal and gas outburst & gas ejection) . Coal and gas outburst has the characteristics of low initial outburst depth, vertical independent layer and plane concentrated distribution. Based on the characteristics of stress and macroscopic deformation and destruction, interlayer slip structures can be classified into two categories (plastic deformation interlayer slip structures, fracture deformation interlayer slip structures) and four subcategories (plastic deformation interlayer slip structures, fracture deformation interlayer slip structures, sliding-damaged interlayer slip structures, derived interlayer slip structures). The interlayer slip structure makes coal thick and coal seam spacing change dramatically, forms tectonic coal, and generates a large number of hidden faults. It makes the coal and gas outburst parameters change mutationally, and makes the coal and gas outburst concentrated and continuous. The interlayer slip structure area is also a concentrated area of coal and gas outburst.