Analysis of engineering geological conditions of Changba lead-zinc mine in Gansu Province
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.
Engineering geologygeotechnical typerock mass structurefault fracture zone
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