Anchoring principles of a new energy-absorbing expandable rock bolt

• Autorzy: Wen Z. , Jiang Y. , Han Z. , Yang S. , Wang X.
• Języki publikacji: EN

Abstrakty

EN

The greater the mine, the harder stability control will be. And the conventional rock bolts do not adapt well to the severe rock stress conditions. An ideal bolt having a high resistance and large deformation should be developed. Based on the test results and theoretical study, this paper proposes an energy-absorbing expandable rock bolt, which consists of the bar, sleeve, bolt plate, nut, and bolt end. The anchoring mechanism and its efficiency were systematically analysed in the laboratory and in practice: the anchoring mechanism and supporting density, especially the quantitative relationship, were deduced under the Energy Balance Theory, that is, EB = 1 2 · n · F0 (u0 + 2∆u). As Compared with the conventional bolt and large deformation bolts, the new type of bolt could provide a larger constant resistance, even in the soft rock roadway with large squeezing deformation, the pulling force can be achieved by F = A · σ · f2, it mainly being generated by a normal stress acting on the pore surface. These characteristics are helpful in making the supported roadway safe. The amount of released energy during the large deforming process of the surrounding rock is expressed through conservation of energy, which can provide reference to the quantitative calculation of the bolt supporting system.

Słowa kluczowe

EN

rock bolt; energy-absorbing; large deformation; constant resistance; action mechanism

PL

pochłanianie energii; odkształcenia; kotew; śruby

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Engineering Transactions
• Rocznik: 2016
• Tom: Vol. 64, iss. 1
• Strony: 89--103
• Opis fizyczny: Bibliogr. 16 poz., rys., tab., wykr.

Twórcy

autor

Wen Z.

• Research Center of Geotechnical and Structural Engineering Shandong University Jinan, Shandong 250061, P R China
• State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao, Shandong 266590, P R China

autor

Jiang Y.

• State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao, Shandong 266590, P R China

autor

Han Z.

• State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao, Shandong 266590, P R China

autor

Yang S.

• State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao, Shandong 266590, P R China

autor

Wang X.

• State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao, Shandong 266590, P R China

Bibliografia

• 1. Li C.C., A new energy-absorbing bolt for rock support in high stress rock masses, International Journal of Rock Mechanics and Mining Sciences, 47(3): 396–404, 2010.
• 2. Li C.C., Performance of D-bolts under static loading, Rock Mechanics and Rock Engineering 45(2): 183–192, 2012.
• 3. Wen Z.J., Qu G.L., Wen J.H., Shi Y.K., Jia C.Y., Deformation failure characteristics of coal body and mining induced stress evolution law, The Scientific World Journal 2014 (5), Article ID 714507, 2014.
• 4. Ansell A., Laboratory testing of a new type of energy absorbing rock bolt, Tunnelling and Underground Space Technology 20(4): 291–300, 2005.
• 5. Wen Z.J., Study on the stability of roadway in Dongda coal mine [in Chinese], Shandong University of Science and Technology Report, pp. 56–89, 2012.
• 6. Wang J., Large deformation with constant-resistance supporting mechanism and its application of deep rock tunnel in Tangkou Coal Mine [in Chinese], Doctoral Thesis, China University of Mining and Technology, 2010.
• 7. Wen Z.J., Study of stress features of fully grouted prestressed anchors, Rock and Soil Mechanics, 31: 177–181, 2010.
• 8. Ansell A., Dynamic loaded rock reinforcement, Doctoral Thesis, Bulletin 52, Dept. of Structural Engineering, Royal Institute of Technology, Stockholm, 1999.
• 9. Gaudreau D., Performance assessment of tendon support systems submitted to dynamic loading, Master Thesis, Ecole Polytechnique de Montreal, 2004.
• 10. Stacey T.R., Ortlepp W.D., Support appropriate for dynamic loading and large static loading in block caf´e mining openings, Procc. MassMin 2000, pp. 783–789, Brisbane, Qld, 2000.
• 11. Wu R., Development of a new yielding rock bolt-Yield-Lock bolt, [in:] The 44th US rock mechanics symposium, pp.10–197, Salt Lake City, USA, ARMA, 2010.
• 12. Amusin B., Ground control and design of deep mine openings, International Journal of Rock Mechanics and Mining Sciences 35(4–5): 1365–1609, 1998.
• 13. Ferrero A.M., The shear strength of reinforced rock joints, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 32(6): 595–605, 1995.
• 14. Li C., Stillborg B., Analytical models for rock bolts, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 36(8): 1013–1029, 1999.
• 15. Serrano A., Olalla C., Tensile resistance of rock anchors, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 36(4): 449–474, 1999.
• 16. Galvez J.C., Elices M., Olivares A. ´ , Damage tolerance of an anchor head in a posttensioning anchorage system, Engineering Failure Analysis, 13(2): 235–246, 2006.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.