Study on Control Effect of NPR Cables on Unstable Slope of Dolomite Mine
Joints and fissures are the main influencing factors of slope instability in open pit mining,therefore,the study of joints and fissures is beneficial to solve the safety problem of mine slope mining.Taking the slope instability of Huangyukou Dolomite Mine in Beijing City as the engineering geological background,the experimental study was carried out using the meth-ods of field investigation(line survey method and chipping polar projection method),numerical simulation of NPR cables and field monitoring,with the idea of active support by NPR cables as the core.The study shows that:① The slope rock layer of Huangyukou Dolomite Mine is basically horizontal or in the same direction as the slope orientation.The structure of the slope body is fragmented,the joints and fissures are developed,and there are weak interlayer and multiple slip zones.Therefore,there is a trend of serious slope instability.② The best support effect of the slope was achieved when the angle of incidence of the NPR cable was 20°.At this time,the slope displacement was about 2.55 cm,indicating that the NPR cable had a greater anti-slip effect on the broken slope.③ According to the field monitoring,the anchor force of NPR cable can reach about 300 kN,and the slope is more stable after support.The study indicated that NPR anchor cable has a good control effect on slope with joint crack development,which can provide reference for slope treatment of similar open-pit mine.
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