为了预防煤和瓦斯突出,在沃尔库特和库兹巴斯各矿井中采用了高压水射流冲刷超前孔的方法。在准备巷道中冲孔的深度为10—15米,各组孔相互重叠,扇形布置的孔在构造破坏有潜在突出危险分层的煤中超过巷道周边两米。孔超前巷道工作面不得小于5米。这些孔布置成一排,它们之间的煤柱被地压所破坏,从而在煤层中形成超前缝隙(图1)。 In order to prevent coal and gas outburst, high-pressure water jet scour ahead of the hole was used in each mine in Volkut and Kuzbass. In the preparation of roadway punching depth of 10-15 meters, the holes overlap each other, fan-shaped holes in the structural destruction of potentially prominent danger of stratification of the coal over the roadway two meters. Hole ahead of the tunnel face shall not be less than 5 meters. The holes are arranged in a row with the pillars between them being destroyed by the earth pressure, leading to the formation of lead gaps in the coal seam (Figure 1).