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顿斯克采选公司青年铬铁矿,在建矿和首批工业试验矿块的采准及开采过程中,暴露出矿体和围岩的稳同性很差。分析矿山巷道所揭露的矿物组成与结构表明,岩体稳固性很低的主要原因是存在各种方向的极发育的裂隙系。裂隙中填满了次生矿物,主要是蛇纹辉绿岩,还有少量滑石等。当巷道揭露这些矿物时,这些矿物与井下空气成分起化学反应和发生分解,沿裂隙面形成滑面。巷道是在由大小不同的坚硬岩块组成的岩块间粘结力极小的岩体中掘进
The Danish mining company Chromium Chromite, exposed during mining and mining of the first batch of industrial test nuggets, revealed poor stability between the orebody and the surrounding rock. Analyzing the mineral composition and structure revealed by the mine roadway shows that the main reason for the low stability of the rock mass is the existence of extremely developed fractured systems in various directions. Fissures filled with secondary minerals, mainly serpentine diabase, there is a small amount of talc and so on. When the roadway exposes these minerals, these minerals chemically react with the downhole air constituents and decompose to form slip surfaces along the fracture surface. Roadway tunneling is carried out in rock masses with very low cohesion between rock masses consisting of hard rock of different sizes