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PHYSICS OF ROCKS AND PROCESSES
ArticleName Field trial of Anker-Test device for nondestructive rock bolt control using shock response spectrum analysis
DOI 10.17580/gzh.2016.12.07
ArticleAuthor Voznesensky A. S., Krasilov M. N., Kutkin Ya. O., Koryakin V. V.
ArticleAuthorData

College of Mining, National University of Science and Technology–MISIS, Moscow, Russia:

A. S. Voznesensky, Professor, Doctor of Engineering Sciences, аl48@mail.ru
M. N. Krasilov, Post-Graduate Student
Ya. O. Kutkin, Assistant, Candidate of Engineering Sciences
V. V. Koryakin, Assistant

Abstract

The College of Mining of the National University of Science and Technology—MISIS accomplishes R&D on Anker-Test device meant for the nondestructive inspection of rock bolts in underground mines. The device is equipped with the data recording and processing block with a display, which allows on-the-spot examination of rock bolting. The device implements the shock response spectrum analysis; measures amplitudes Am and frequencies Fm of maximums in percussion spectrums; and successively displays shape and spectrum of signals, and the identification diagram, where each signal is represented by a point in the Fm–Am frame. The field trial of Anker-Test device was carried out in underground excavations reinforced with polymer-coated steel rock bolts in KNAUF Gips Novomoskovsk mine. Two sites were selected for the tests: stope roof 11 m high, rock bolts 1.m long with the spacing of 0.5–1 m; crosscut roof 6.5 m high, rock bolts 1.2 m long with the spacing of 2 m. Prior to starting the tests, a few signals were recorded from the knowingly weak and high-tension rock bolts. These signals served as a reference. During laboratory processing of the recorded signals, the optimal signal bandwidth was selected. The frequency monitoring was based on values averaged over 10 signals. The article presents a diagram of standard parameters of signal spectra in the coordinates Fm–Am for high-tension and weak rock bolts in a stope roof. A t-test of difference of two population means shows that the hypothesis that two population means are equal is valid for samplings of the parameters of the consimilar states (both bolts are under high tension, or both bolts are weak). The samplings of the parameters of different states show that two population means are unequal. The trials display the efficiency of Anker-Test device in handling the set objectives.
This study has been carried out under research plan No. 109 in the framework of the basic part of the research assignment issued by the Ministry of Education and Science of the Russian Federation for 2016.

keywords Rock bolting, roof, underground openings, Anker-Test devices, nondestructive control, percussion spectrum method, rock bolt tension, state-transition diagram
References

1. Available at: http://www.ptb72.ru/upload/Prikaz_RTN_ot_06.11.13__520.pdf (accessed: 15.10.2016). (in Russian)
2. Belikov A. V. Method of forecasting of zones with weak contacts in strong rocks of winning roofing, fixed by steel-polymeric anchor support. Gornyy informatsionno-analiticheskiy byulleten. 2008. No. 12. pp. 346–349.
3. Campoli A. A. Variables affecting resin anchorage performance in United States roof bolting systems. Roofbolting in Mining: 4th International Symposium, 6–7 June 2001. Germany : RWTH Aachen, 2001. pp. 19–28.
4. Craig P. H., Saydam S., Hagan P., Vandermaat D., Elias E., Crosky A. Investigations into the corrosive environments contributing to premature failure of Australian coal mine rock bolts. Ground Control in Mining: 34th International Conference, 28–30 July. USA, 2015. pp. 140–144.
5. Vandermaat D., Saydam S., Hagan P., Crosky A. G. Examination of rockbolt stress corrosion cracking utilising full size rockbolts in a controlled mine environment. International Journal of Rock Mechanics and Mining Sciences. 2016. Vol. 81. pp. 86–95.
6. Lis S. N., Magzumov A. E. Investigation of the carrying capacity of anchor support, fixed by the ACD ampoules. Gornyy informatsionno-analiticheskiy byulleten. 2008. No. 2. pp. 182–184.
7. Alber M., Polysos N., Riihl S. Directional rock bolt pullout tests as index test for estimating rock mass quality. Ground Control in Mining: 22th International Conference, 5–7 August, USA, 2003. pp. 240–245.
8. Barnard Ch. K., Kallu R., Warren S., Thareja R. Inflatable rock bolt bond strength vs. rock mass rating (RMR): A comparative analysis of pull-out testing data from underground mines in Nevada. Ground Control in Mining: 34th International Conference, 28–30 July. USA, 2015. pp. 111–115.
9. Demchenko A. I., Yaytsov A. A. Results of extension testing of steel-polymeric anchors in complex mining-geological conditions. Naukovі pratsі UkrNDMІ NAN Ukraini. 2007. No. 1. pp. 239–247.
10. Voznesenskiy A. S., Voznesenskiy E. A., Koryakin V. V., Krasilov M. N. The construction principles and development perspectives of the monitoring devices of the rock massif around excavations and of the mine working support. Gornyy informatsionno-analiticheskiy byulleten. 2015. No. 1. pp. 199–206.
11. D. Yu. Ryabukhin, M. V. Kornilkov, V. E. Petryaev, V. E. Bolikov. Method of nondestructive control of anchor reinforced concrete lining. Patent RF, No. 2487243 S2, IPC E21D20/02. Applied: 31.05.2011. Published: 10.07.2013. Bulletin No. 34.
12. Bulat A. F., Vinogradov V. V. Anchorage support of coal mine excavations. Dnepropetrovsk : Vilpo, 2002. 372 p.
13. Hyett A., Forbes B., Spearing S. Enlightening bolts: using distributed optical sensing to measure the strain profile along fully grouted rock bolts. Ground Control in Mining: 32th International Conference, 29 July – 2 August 2013. pp. 135–139.
14. M. G. Ezerskiy, V. A. Yakubov. Method of quality control of anchoring rod placing in well. Patent RF, No. 2011748 C1, IPC E02D17/04. Applied: 05.09.1991. Published: 30.04.1994.
15. T. Matsunaga, J. Etoh, Y. Isobe, T. Jodai. A method and device for nondestructive testing of an anchor bolt. Patent WO 2016/017193 JP, G01N 29/12 (2006/1). Decl.: 01.08.2014. Publ.: 27.01.2015.
16. Voznesenskiy A. S., Koryakin V. V., Voznesenskiy E. A. Physico-technical evaluation of shock response spectrum method for strata bolting control. Gornyi Zhurnal. 2016. No. 3. pp. 17–20. doi: 10.17580/gzh.2016.03.03

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