Stability control of deep-buried roadways using large deformation and increasing resistance anchor cables

Abstract

A new large deformation and increasing resistance anchor cable was developed. The energy absorption and pressure release were achieved through connecting six straight tube-shaped steel structures (thickness of 5 mm) containing a circular V-shaped groove in series, with the energy absorption ratio of 44.55 J/g. The pull-out experiment indicates that the ultimate deformation (221.58 mm) of the new anchor cables is 4.87 times larger over that of traditional anchor cables, achieving good properties of large deformation, increasing resistance and high energy absorption. Through secondary development of the universal discrete element code (UDEC), two elastic deformation stages of the supporting resistance — deformation curves for anchor cables were simulated. The numerically simulated supporting effects of the new anchor cables on deep-buried roadways show that the roof subsidence decreases by 88.33% and 74.64%, the peak maximum principal stress at stable states declines by 23.15% and 18.34%, and the thickness of plastic zones decreases by 37.50% and 62.50%, respectively, compared with those of the roadways with no support and traditional anchor cable support. Finally, the new-developed anchor cables were successfully applied in real roadways, with the maximum convergence deformation for the two sides of approximately 300 mm, achieving a good supporting effect.

Keywords

large deformation / increasing resistance / energy absorption structure / anchor cable / stability control / engineering application

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