甘肃省厂坝铅锌矿工程地质条件浅析

Analysis of engineering geological conditions of Changba lead-zinc mine in Gansu Province

矿区土体按成因类型和土体结构可分为一般土和特殊土两大类,一般土主要为冲洪积砂砾卵石、碎石及粉土,特殊土有残坡积碎石土、崩滑碎石土和人工堆积矿渣,结构松散凌乱,孔隙大,透水性强,压缩性高,物理力学性质极不稳定。矿区矿石类型、结构构造、物质成分特征完全相同。矿床赋存在坚硬、半坚硬的碳酸盐岩及碎屑岩层中,可分为大理岩含矿系统和片岩含矿系统两大类,较坚硬中厚层状片岩岩组:主要包括黑云母石英片岩、黑云母片岩和石英片岩,岩石较坚硬,中厚层状结构为主,坚硬厚层状大理岩岩组:岩性主要为带状结晶灰岩、白云岩层组成,工程地质性质较好。厂坝铅锌矿床岩石一般完整-较完整,岩体结构类型主要为整体块状结构及层状结构,矿体及围岩较坚硬,陡倾斜,倾角75°~85°,岩石稳定性好,矿体顶、底板和采矿工程系统范围内岩、矿石大多数裂隙不甚发育,一般比较稳定,断裂带附近岩石破碎。综合考虑,确定矿区为工程地质条件中等的矿床。

Mining area soil according to the genetic type and soil structure can be divided into two categories of general soil and special soil,general soil mainly for flood gravel pebble,gravel and silt,special soil has residual slope gravel soil,landslide gravel soil and artificial accumulation slag,loose structure,pores,high permeability,high compressibility,physical and mechanical properties are extremely unstable.The ore type,structure and material composition characteristics of the mining area are exactly the same.Mineral deposit occurrence in hard,half hard carbonate rock and clastic rock layer,can be divided into marble ore system and schist ore system of two categories,hard thick layered schist group:mainly including black mica quartz schist,black mica schist and quartz schist,rock is hard,thick layered structure,hard thick marble group:lithology mainly banded crystalline limestone,dolomite layer,engineering geological properties are good.Factory dam lead-zinc deposit rock generally complete-complete,the rock structure type is mainly the whole mass structure and layered structure,ore body and surrounding rock is hard,steep tilt,75°~85°,rock stability,rock top,floor and mining system within the scope of rock,ore most cracks not developed,generally stable,rock broken near the fault zone.After comprehensive consideration,the mining area is determined as a deposit with medium engineering geological conditions.