UralEnergoResurs LLC, Magnitogorsk, Russia:

A. A. Zubkov, Depu ty Director, Candidate of Engineering Sciences

S. S. Neugomonov, Chief Technical Officer, Candidate of Engineering Sciences

Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:
P. V. Volkov, Associate Professor, Candidate of Engineering Sciences
I. M. Kutlubaev, Professor, Doctor of Engineering Sciences, ptmr74@mail.ru

Increasingly deeper level mining in highly complicated geological conditions dictates improvement of the existing systems of mine support. The pilot commercial testing which have been implemented for 13 years in mines in Russia, Kazakhstan, Uzbekistan and Kyrgyzstan makes it possible to develop and improve friction-anchored rockbolting technologies of different geological and geotechnical conditions. The promising mine support technologies should be based on integration of mixed-type support designs including friction-anchored rock bolts, reinforcement and, sometimes, pre-treatment of adjacent rock mass. Under conditions of rockburst hazard, it is recommended to combine various rockbolting systems. The system of friction-anchored rock bolts and reinforcement ensures sufficient load-bearing capacity in case of adjacent rock mass displacement owing to the use of a special friction-anchored bolt insert of a smaller diameter. In this case, given low yielding of the rock bolt material, it is possible to provide its sufficient extension. After a series of tests, it is found that the limiting load preceding displacement of the face plate is 128.8 to 141.2 kN. The ‘yield’ of the face plate, from the load of 50 kN up to the limiting load, is 8.1–9.2 mm. When the limiting load is reached, the external diameter of the thrust decreases and the thrust ‘passes through’ the hole in the plate, which favors stability of a roadway in case of dynamic events. Neither the thrust no the rod experiences damage in this case. The essential scatter in the values of the limiting loads is conditioned by the difference (instability) in heating time of the rod before the formation of the thrust. The optimal heating time is 2.5 s, and it is maintained and held in case of complete automation of friction-anchored rock bolt manufacture. The promising design solutions on mine support systems using friction-anchored rock bolts are identified.

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