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由于俄矿下1煤由坚硬钙质胶结的砾岩和粗砂岩组成。在工作面回采过程中曾经出现过采空区顶板大面积悬空不落,而初次来压时造成顶板下沉切顶、压垮支架和初次来压导致的风暴,造成人员不同程度的受伤等事故。为了促使坚硬难冒落顶板随工作面的推进及时冒落,缩短初次来压步距、大幅降低因采空区大面积悬空而初采来压时所造成的压垮支架、推垮工作面的安全生产事故,采用了降低工作面推进速度措施结合超前预爆破技术控制顶板,效果明显,为该面的安全回采提供了保障。
As a result of the Russian coal mine by a hard calcite cemented conglomerate and coarse sandstone composition. During the mining face of the working face, a large area of the roof of the gob-free area has been vacant for a long time. When the roof is pressed for a first time, the top of the roof is sunk, the storming caused by crushing the support and the initial pressure is caused, causing injuries of personnel to different degrees . In order to promote hard to fall off the roof with the advancement of work in time to take the initiative to shorten the first step to shorten the pressure step, drastically reduced due to vacant large area vacant and the first mining pressure to crush the stent, crushing the face Safety accidents, using measures to reduce the advancing speed of the work face combined with advanced pre-blasting technology to control the roof, the effect is obvious, providing a guarantee for the safe mining of the face.