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80年代初期,霍姆斯特克矿已将劳动强度大的采矿法如工作面不用支护的分层充填采矿法改为垂直漏斗后退式(VCR)大量采矿法与机械化分层充填采矿法。因为前者成本高和生产力低。用VCR法回采矿房后形成的采空区可容纳霍姆斯特克矿的掘进废石,因而可进一步降低其成本。为便利于从邻近的掘进工作面直接将废石溜放到空区,发展了深孔分段爆破天井掘进法。因探孔分段爆破掘进法允许在空场上部钻凿深孔,无需开挖天井钻进硐室或购置设备的费用,故其成本低于天井钻进法。此外,深孔分段爆破法不要求从下部进入掘进工作面,因而比普通天井掘进法更为安全。霍姆斯特克矿成功地应用了两种深孔分段爆破法掘进天井,其一是用2(1/4)英寸(1英寸=25.4mm)炮孔的环形凿岩机深孔分段爆破法;其二是用6(1/2)英寸炮孔的VCR分段爆破法。
In the early 1980s, the Homestead Mining Company changed labor-intensive mining laws such as stratified charge mining without supporting the work surface to the VCR mass mining and mechanized stratified charge mining methods. Because of the high cost and low productivity. The mined-out area formed after the VCR back-mining operation can accommodate the excavation waste rock from the Homestead Mine, thus further reducing its cost. In order to facilitate the waste rock directly from the adjacent heading face to the empty area, the development of deep-hole section blasting tunneling method. The cost of submerged drilling is lower than that of the well drilling due to the subsea blasting excavation method that allows drilling of deep holes in the upper part of the void without the need to dig into the chamber or purchase equipment. In addition, the deep-hole staged blasting method does not require entry from the lower part of the tunneling surface and is therefore safer than the normal boring method. The Holmskecker mine successfully applied two types of deep-hole segmented blasting to tunnel the well, one of which was a deep-hole segmented blasting of a toroidal rock drill with 2 (1/4) inch (1 inch = 25.4 mm) ; The second is a VCR subsection blasting with a 6 (1/2) inch hole.