论文部分内容阅读
湖南湘东铁矿在使用长壁式单分层崩落采矿法的试验过程中,由于顶板岩层二次压力频繁出现,因此,研究如何切断二次压力是试验工作中的一个难题。经分析研究在工作面切顶线的位置保留部分不连续矿柱,让它起切顶支架的作用,经过试验获得成功,并在生产中推广。以后在遵义锰矿等矿山的生产实践中也证明是有效的。 (一) 地质概况湘东铁矿属宁乡式沉积矿床,产于上泥盆纪翻下层中。矿体呈层状产出,厚1.7～2.0米,倾角25～30°。矿
In the process of using longwall single-layer caving mining method in Hunan Xiangdong Iron Mine, it is a difficult problem in the experiment to study how to cut off the secondary pressure due to the frequent occurrence of secondary pressure in roof strata. After analyzing and researching, the part of discontinuous pillar is reserved at the top line of the working face, making it play the role of cutting and supporting the top bracket, being tested successfully and popularized in production. Later in the Zunyi manganese mines and other production practices have also proved effective. (A Geological Survey Xiangdong iron ore is a Ningxiang-type sedimentary deposits, produced in the Upper Devonian turned down. Ore body is layered output, thickness 1.7 ~ 2.0 meters, dip 25 ~ 30 °. mine