People’s Friendship University of Russia, Moscow:

Eremenko V. A., Professor RAS, Doctor in Engineering, Principal Researcher, Chief of Department of Geodesy and Mine Surveying, eremenko@ngs.ru

Neguritsa D. L., Associate Professor, Candidate of Technical Sciences, Chief of Department of Geodesy and Mine Surveying, 1104780@gmail.com

The full-scale research has been undertaken in mines in Gornaya Shoria, Khakassia, Buryatia, Northern Kazakhstan and Western Australia to study geometrics of deformation of holes using special equipment—video endoscope, laser range finder, dip compass, hole treatment device, downhole operation device and guide rods. The new developed technology of live stress and strain monitoring in rocks allows basic characteristics of local areas in rocks to be determined within a short time: orientation and range of major principal stresses, relative deformation, location of damage rock zones (fractured rocks), zones of shearing and compression, sizes and dynamics of cracks, zone of influence of drivage and working excavation, mechanisms of failure and time of relaxation in rocks (maximum abutment pressure zones). The active monitoring technology is recommended for stress estimation in mining with caving with natural and manmade support. In the framework of the technology, the method is developed for downhole detection of damaged rock zones and the device is engineered for applying fast-drying coating on inner surface of holes for better examination of crack growth. Initiation and growth of cracks, as well as deformation and shearing in hole are clearly observed on negative images. To measure the length and width of cracks and for assessing dynamics of their growth, the measuring probes are designed and the downhole crack measurement technique is elaborated. After the full-scale mapping of holes, the data are processed, interpreted and presented in graphical form for analyzing geometry of deformation and jointing in holes.

This study has been supported by the Russian Science Foundation in the framework of government contract, Grant No. 14-37-00050.

1. Available at: http://docs.cntd.ru/document/499066482 (in Russian)
2. Barton N. Application of Q-System and Index Tests to Estimate Shear Strength and Deformability of Rock Masses. Workshop of Norwegian Method of Tunneling. New Delhi, 1993. pp. 66–84.
3. Laubscher D. H. A Geomechanics Classification System for the Rating of Rock Mass in Mine Design. Transactions of South-African Institute of Minerals and Metallurgy. No. 9(10). 1990.
4. Potvin Y. High Energy Absorption (HEA) mesh – a yieldable high load support system for demanding ground support applications. An ACG/UWA presentation published on YouTube. 18 July 2012.
5. Balg C., Roduner A. ‘Geobrugg AG: ground support applications’. International Ground Support Conference. AGH University. Lungern, Switzerland, 11–13 September 2013.
6. Louchnikov V., Brown S., Bucher R. Mechanized installation of high-tensile chain-link mesh in underground operations, in prroceedings of 11th AusIMM Underground Operators. Conference, Canberra, Australia, March 21–23, 2011. pp. 40–60.
7. Clements M. Shotcrete behaviour in mining. EAGCG Workshop on Shotcrete, Sydney, Australia, 23–24 May 2012.
8. Baryshnikov V. D., Baryshnikov D. V., Gakhova L. N., Kachalsky V. G. Practical experience of geomechanical monitoring in underground mineral mining. Journal of Mining Science. 2014. Vol. 50, No. 5, pp. 855–864.
9. Seryakov V.M. Mathematical modeling of stress–strain state in rock mass during mining with backfill. Journal of Mining Science. 2014. Vol. 50, No. 5. pp. 847–854.
10. Mirenkov V. E. Calculation of stresses and displacements in a rock block. Fundamental Problems of Geoenvironment Formation under Industrial Impact: Conference Proceedings. Vol. 1: Geotechnology. Novosibirsk: Institute of Mining, Siberian Branch RAS, 2012. pp. 251–254. (in Russian)
11. Ivanov V. V., Pashin D. S. Geomechanical aspects of electrometric rockburst hazard prediction in iron ore strata. Problems of Geoenvironment Formation under Industrial Impact: Conference Proceedings. Vol. 1: Geotechnology. Novosibirsk: Institute of Mining, Siberian Branch RAS, 2012. pp. 229–233. (in Russian).
12. Iofis M. A., Esina E. N. Geomechanical prognosis and control in boreholemineral mininge. Problems of Geoenvironment Formation under Industrial Impact: Conference Proceedings. Vol. 1: Geotechnology. Novosibirsk: Institute of Mining, Siberian Branch RAS, 2012. pp. 175–180. (in Russian).
13. Method for downhole determination of damaged rock zones. Patent pending. March 31, 2015.
14. Method for downhole determination of orientation and ranges of principal stresse. Patent pending. April 2, 2015.
15. Canny J. A Computational Approach to Edge Detection, IEEE Transactions. PAMI, 1986. Vol. 8, pp. 34–43.
16. Method for measurement of fractures in holes. Patent pending. April 15, 2014.
17. Method for estimation of damaged and rockburst-hazardous rock masses. Patent pending. November 28, 2014.
18. Sandy M. P., Lushnikov V. N., Eremenko V. A., Bucher R. Opyt krepleniya gornykh vyrabotok na podzemnykh rudnikakh Avstralii i Kanady v silnodeformiruemykh vmeshchayushchikh massivakh (Experience of excavation supports on Australian and Canadian underground mines in severe-strain enclosing massifs). Gornyi Zhurnal = Mining Journal. 2013. No. 10.
19. Eremenko V. A., Lushnikov V. N., Sandy M. P., Milkin D.A., Milshin E. A. Obosnovanie i vybor tekhnologii provedeniya, sposobov krepleniya i podderzhaniya gornykh vyrabotok v neustoychivykh gornykh porodakh glubokikh gorizontov Kholbinskogo rudnika (Selection and basis of mine working driving and excavation support in unstable rocks at deep levels of Kholbinsky Mine). Gornyi Zhurnal = Mining Journal. 2013. No. 7.
20. Eremenko V. A. Gipsovo-skvazhinnaya stantsiya kontrolya napryazhennodeformirovannogo sostoyaniya strukturno narushennogo i udaroopasnogo massiva gornykh porod abakanskogo mestorozhdeniya (Ggypsum–borehole observation plant to monitor stresses and strains in damaged and rockburst-hazardous rock mass of the Abakan deposit). Gornyy informatsionno-analiticheskiy byulleten = Mining informational and analytical bulletin. 2015. No. 3. pp. 5–13.