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一、工程概况小官庄铁矿是张家洼矿田三矿床之一,位于山东省莱芫县城北八公里。该矿系大型隐伏矽卡岩富磁铁矿床,埋藏深度为400～1000米。矿体与围岩交错穿插,相间成层,构造十分复杂。矿体顶部围岩为第三系砂砾岩(又称红板岩),岩性松软,f=1～2。砂砾胶结物有钙质和泥质两种,前者较后者稳固,且后者遇水膨胀,易松散塌落。矿体底部围岩主要为闪长岩,f=8～12,较稳固,其与矿体接触部位有蚀变闪长岩,f=
First, the project profile Small Guanzhuang iron ore is one of Zhangjiawa ore three deposits, located in Laiyuan County, Shandong Province, eight kilometers north of the city. The Department of large-scale hidden skarn-rich magnetite deposits, buried depth of 400 to 1,000 meters. Ore body and the surrounding rocks interspersed interlaced, phase stratification, the structure is very complicated. Surrounding rocks at the top of the orebody are Tertiary conglomerate (also known as red slate) with soft lithology, f = 1-2. Gravel cement has two types of calcareous and argillaceous, the former is more stable than the latter, and the latter is swollen with water and easily loose and slump. The rock mass at the bottom of the ore body is mainly diorite, f = 8-12, which is relatively stable. There are alteration diorite in the contact part with the ore body, f =