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十二矿己14煤层基本顶为厚度9~18m的中粒砂岩,不易垮落,厚硬顶板条件下,留巷墙体载荷大,沿空留巷支护难度极大。为保证留巷效果,对留巷段进行强制放顶。强制放顶期间共爆破21次,用炸药近7 000kg,有效使工作面采空区基本能够随采随落,保证了留巷效果及采面的顺利推进。
The basic structure of the 12th Mine Seam 14 is a medium-grain sandstone with a thickness of 9 ~ 18m. It is not easy to collapse. Under the conditions of thick and hard roof, the load of the retaining laneway wall is large and the support of gob-side entry retaining is extremely difficult. In order to ensure the effect of retaining alley, stay alley segment forcing. During the compulsory caving, a total of 21 shots were demolished and nearly 7,000 kg of explosives were used, which effectively enabled the goaf of the working face to basically follow the mining method and ensure the effect of retaining roadway and the smooth progress of mining face.