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IJSTR >> Volume 4 - Issue 8, August 2015 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Review And Design Concept For Grouted Multi-Jacketted Friction Balancing Rock Bolt

[Full Text]

 

AUTHOR(S)

Peter R K Chileshe

 

KEYWORDS

Index Terms: Friction, grout, grouted rock bolt, jacketted rock bolt, load, load balancing, rock bolt, stress abutment, stress-strain, Zambia.

 

ABSTRACT

Abstract: Rock is under greater abutment stress and strain on the sidewall periphery of an excavation than deeper in the rock, especially in the immediate aftermath of mining. If some mechanism could be actuated where a grouted rock bolt was able to transfer excess strain energy from the highly stressed section in the sidewall along its length to the deeper part, the load along its length would be balanced or equalised through friction. The result would be increased effective rock bolt anchorage length, reduced rock yield in the sidewall, and lessened grout and/or bolt failure. The paper reviews grouted rock bolts and proposes the conceptual grouted ‘Multi-jacketted Rock Bolt’, as one route that could be employed in achieving frictional load balancing along the axis of the grouted rock bolt, with six variations proposed. The ‘Jacketted Rock Bolt’, would be an assemblage of tubular steel jackets, concentrically fitted within each other. As excavations are mined and rock bolted, friction would be generated between ‘jackets’ in grouted jacketted rock bolts, in response to movement in the surrounding grout and or rock mass. This would transmit frictional energy from one jacket to the other in a frictional balancing system. This is conceptual.

 

REFERENCES

[1] Altounyan, P., O’Connor, D., Bugden, A. and Berry, R. (2011). Developments in improving the standard of installation and bond strength of full column resin roof bolts. 22nd International Conference on Ground Control in Mining: August 5-7, 2003, Lakeview Resort & Conference Center, Morgantown, WV, USA / edited by Syd S. Peng.

[2] Aoki, T., Otsuka, I., Shibata, K., Adachi, Y., Ogawa, S. and Tanaka, T. (2004). Axial force distribution of friction-anchored rock bolts. In: Ground Support in Mining and Underground Construction - Proceedings of the Fifth International Symposium on Ground Support, 28–30 September 2004, Perth, Western Australia, pp 311 – 336. Edited by Villaescusa, E. and Potvin, Y. Balkema publishers Leiden/London/New York/Philadelphia/Singapore.

[3] Aziz, N., Nemchik, J., Chen Cao and Jalalifar, H. 2009. Bolt profile configuration and load transfer capacity optimisation. Proceedings of the 28th International Conference on Ground Control in Mining, July 28 – 30, 200, Lakeview Golf and Spa, Morgantown, WV, USA.

[4] Brady, B. H. G. and Brown, E. T. (2004). Rock Mechanics for Underground Mining. New York: Kluwer Academic Publishers.

[5] Charette, F. and Hill, M. 2011. Single pass bolting approach for the stabilisation of rock masses in high stress conditions. Metsco Proceeding CIM /ICM Conferences & Exhibitions Papers Montreal 2011.

[6] Charette, F. and Li, C. C. 2011. Innovative engineering approach to the stabilization of rock masses in high stress conditions. Metsco Proceeding CIM/ICM Conferences & Exhibitions Papers Montreal 2011.

[7] Chileshe, P. R. K. (1992). An Evaluation of Stress Development around Mining Excavations on the Zambian Copperbelt. Unpublished PhD thesis, Vol 1, University Of Wales College of Cardiff, UK. Bookmark http://trove.nla.gov.au/version/46619139 hosted by National Library of Australia (accessed 25 6 2015).

[8] Chileshe, P. R. K. (1996). The Copperbelt segmented load balancing rockbolt. Patent application to Government of the Republic of Zambia Patents Office, Lusaka, Zambia, November 1996.
[9] Chileshe, P. R. K. (2012). Conceptual design of the Copperbelt load balancing telescopic rockbolt. Zambian Journal of Chemical Engineering (ZJChE), Vol.1, No. 1, 2012, pp. 26-30. ISSN: 2223 5019. Copperbelt University, Kitwe, Zambia. www.cbu.edu.zm .

[10] Erasmus, P.N., Smit, J. and Steyn, J. (2009). Management of seismic and swelling ground. World Gold Conference 2009, The Southern African Institute of Mining and Metallurgy, 2009.

[11] Fahimifar, A. and Soroush, H. (2004). Modelling of rockbolt behaviour around tunnels with emphasis on stress distribution on the rockbolt shank. In: Ground Support in Mining and Underground Construction - Proceedings of the Fifth International Symposium on Ground Support, 28–30 September 2004, Perth, Western Australia, pp 363 to 378. Edited by Villaescusa, E. and Potvin, Y. Balkema publishers Leiden/London/New York/Philadelphia/Singapore.

[12] Farmer, I. W. (1975). Stress distribution along a resin grouted rock anchor. Int. Jour. Rock. Mech. Min. Sci, Vol 12, pp 347-351.

[13] Gradnik, R. and Doucet, C. (2011). Roofex® bolt and its application in underground construction. Preprint 11-144. SME Annual Meeting, Feb. 27 – Mar. 02, 2011, Denver, CO. Copyright © 2011 by SME.

[14] Heal, D. P., Potvin, Y. and Hudyma, M. (2006). Evaluating rock burst damage potential in underground mining. In: Proceedings of the American Rock Mechanics Association 41st US Rock Mechanics Symposium: 50 years of Rock Mechanics – Landmarks and Future Challenges [DC-ROM] paper no 1020, 12 p.

[15] Hyett, A., Forbes, B. and Spearing, S. (2013). Enlightening bolts: Using distributed optical sensing to measure the strain profile along fully grouted rock bolts. Proceedings of the 32nd International Conference on Ground Control in Mining, Morgantown, WV, USA.

[16] Jalalifar, H. (2011). An analytical solution to predict axial load along fully grouted bolts in an elastoplastic rock mass. The Journal of the Southern African Institute of Mining and Metallurgy, Volume 11, November 2011, pp 809 – 814.

[17] Ortlepp, W. D. and Stacey, T. R. (1995). Technical note: Safety and cost implications in the spacing of support. The Journal of the South African Institute of Mining and Metallurgy, May/June 1995, pp 141 – 146.

[18] Peng, S. 2015. Longwall mining abutment pressures. http://eis.uow.edu.au/longwall/html/abutment.html (accessed 5th May, 2015).

[19] Potvin, Y. (2011). What have we learnt about rock burst risks? 11th Underground Operators’ Conference, Canberra, ACT, 21 to 23 March 2011.

[20] Pralle, G. E. and Karol, R. H. (1966). Resin anchored rock reinforcing members. In: Proceedings of the First Congress of I S R M, Lisbon, 25 September- 1 October 1966, Vol II, pp. 279-283. Lisbon: Laboratorio Enghenaria Civil, Lisboa.

[21] Radcliffe, D. E. and Stateham, E. S. (1980). Stress distribution around resin-grouted bolts. Report of Investigation 8440, US Bureau of Mines.

[22] Serbousek, M. O. and Signer, S. P. (1987). Linear load transfer mechanics of fully grouted roofbolts. R I 9135, US Bureau of Mines, 17p.

[23] Signer, S. P. (2000). Load behaviour of grouted bolts in sedimentary rock. Proceedings of New Technology for Coal Mine Roof Support, pp 73 – 80.

[24] Signer, S. P. (1988). Comparative studies of grouted roof bolts. In: Seventh International Conference On Ground Control In Mining, August 3-5, Morgantown, WV, USA. pp 282-288.

[25] Signer, S.P. and Lewis, J. L. 1998. A case study of bolt performance in a two-entry gate road. Proceedings of 17th International Conference on Ground Control in Mining, August 4 - 6, 1998, pp 249 – 256.

[26] Signer, S., Pile, J. and Bessinger, S. (2004). Bolt load changes during initial face advance and cross-cut breakthrough. Proceedings of 23rd International Conference on Ground Control in Mining, August 3 – 5, Morgantown, WV, USA.

[27] Wu, R., Oldsen, J. and Campoli, A. (2011). Application of Yield–Lok® Bolt for Bursting and Convergence Grounds in Mines. Proceedings of 30th International Conference on Ground Control in Mining, July 26 – 28, 2011, Lakeview Golf and Spa, Morgantown, WV, USA.