VALIDATION OF FRICTIONANCHORED ROCK BOLT CHARACTERISTICS

There is a trend toward advanced rock bolting technologies these days [1, 2] owing to novel rock bolt types, for the first turn, friction-anchored rock bolts [3–7]. Rock bolts of this type ensure: installation time of a few minutes, taking of load immediately after installation and economic efficiency. As international practice shows, it is promising to use friction-anchored rock bolts as reinforcement in rockburst-hazardous mines [8, 9] and as a part of hybrid technologies [10]. Various structural alternatives are extensively studied, for instance, polymer coating [11, 12]. Performance of friction-anchored rock bolting is governed by its ability to withstand loads by all components and their elements. The load-bearing capacity of a friction-anchored rock bolt should be determined as the least load-carrying capacity of the shaft, plate and nut. Numerical values of these load-carrying capacities are either calculated or found experimentally. The research shows that the limiting factor is the load-carrying capacity of the nut. Thus, this is the parameter of the top concern in selection of friction-anchored rock bolts. The actual load-carrying capacity of the nut is governed by its structure and weld quality. The most stable and strongest weld is when the nut and the shaft are connected by automatic or semiautomatic arc welding. It is possible to increase allowable loading of the nut by using a compound variant. In this case, the partial unloading of the weld is achieved through special design of the tailpiece of the anchor shaft.

 

 

For citation: Zubkov A. A., Kalmykov V. N., Kutlubaev I. M., Naydenova M. S. Validation of frictionanchored rock bolt characteristics. MIAB. Mining Inf. Anal. Bull. 2019;(10):35-43. [In Russ]. DOI: 10.25018/0236-1493-2019-10-0-35-43.

Keywords

Friction-anchored rock bolt, mounting group, load-carrying capacity, weld, experiment, face plate, allowable force.

Issue number: 10
Year: 2019
ISBN: 0236-1493
UDK: 622.281.74.001.2
DOI: 10.25018/0236-1493-2019-10-0-35-43
Authors: Zubkov A. A., Kalmykov V. N., Kutlubaev I. M., Naydenova M. S.

About authors: A.A. Zubkov, Cand. Sci. (Eng.), Deputy Director, JSC UralEnergoResurs, 455000, Magnitogorsk, Russia, V.N. Kalmykov (1), Dr. Sci. (Eng.), Professor, I.M. Kutlubaev (1), Dr. Sci. (Eng.), Professor, e-mail: ptmr74@mail.ru, M.S. Naydenova (1), Graduate Student, e-mail: bonzulik@yandex.ru, 1) G.I. Nosov Magnitogorsk State Technical University, 455000, Magnitogorsk, Russia. Corresponding author: I.M. Kutlubaev, e-mail: ptmr74@mail.ru.

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