Method and equipment for determining the load bearing capacity of friction bolts
S.S. Neugomonov1, A.A. Zubkov1, I.M. Kutlubaev2, R.V. Kulsaitov2
1 LLC UralEnergoResurs, Magnitogorsk, Russian Federation
2 Nosov Magnitogorsk State Technical University, Magnitogorsk, Russian Federation
Russian Mining Industry №5 / 2023 р. 83-87
Abstract: In underground mining, surface reinforcement is a mandatory part of the works. In addition to frame supports, rock bolts and in some cases a combination of the two are now used. The Split Set® friction bolts, referred to as the FRS, i.e. Friction Rock Stabilizers, in the foreign literature, are actively used. More than 11 companies in Russia are currently officially engaged in production of the friction bolts. At the same time, there is a significant difference in the properties of steel used in production of the bolt shafts. Foreign manufacturers recommend the use of steel with the yield strength of 350–400 MPa. This parameter determines the main characteristic of the FRS, i.e. the load-bearing capacity, which can be assessed only after the friction bolt is introduced in the borehole. Until recently, no way has been available to control this parameter of the standard rock bolt. This is explained by the specific feature of the FRS design, i.e. the absence of projecting parts. The load-bearing capacity is determined using specially prepared rock bolts. The purpose of the research was to develop a method and equipment for determining the bearing capacity of the standard FRS bolt using a certified rock bolt tester. The "expanding collet" method of gripping the bolt shaft was adopted. The design of the loading device was based on interpretation of the structural analysis method for mechanical devices. The parametric synthesis of the device elements was carried out on the basis of experimental trials. Experimental and industrial trials of the device confirmed the possibility of determining the load bearing capacity of any FRS bolt. The implementation of the device makes it possible to test the bearing capacity without disturbing the integrity of the excavation and the rock bolt itself.
Keywords: friction bolt, load-bearing capacity, loading device, kinematic diagram, experimental studies
For citation: Neugomonov S.S., Zubkov A.A., Kutlubaev I.M., Kulsaitov R.V. Method and equipment for determining the load bearing capacity of friction bolts. Russian Mining Industry. 2023;(5):83–87. (In Russ.) https://doi.org/10.30686/1609-9192-2023-5-83-87
Article info
Received: 21.07.2023
Revised: 23.08.2023
Accepted: 28.08.2023
Information about the authors
Sergei S. Neugomonov – Cand. Sci. (Eng.), Technical Director, LLC UralEnergoResurs, Magnitogorsk, Russian Federation
Anton A. Zubkov – Dr. Sci. (Eng.), General Director, LLC UralEnergoResurs, Magnitogorsk, Russian Federation
Ildar M. Kutlubaev – Dr. Sci. (Eng.), Professor, Department of Lifting and Transport Machines and Robots, Department of Mining Machines and Transport and Technological Complexes, Nosov Magnitogorsk State Technical University, Maginitogorsk, Russian Federation; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Ravil V. Kulsaitov – Cand. Sci. (Eng.), Associate Professor of the Department of Underground Mining, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russian Federation; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
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