Application of the tensile strength to rock blasting
/ 1
- Details
- Category: Solid State Physics, Mineral Processing
- Last Updated on 01 September 2019
- Published on 19 August 2019
- Hits: 3097
Authors:
H. Azzouz Rached, Badji Mokhtar University, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
S. Yahyaoui, Dr. Sc. (Tech.), Badji Mokhtar University, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract:
Purpose. Determination of the blastability index from rock strength properties, which employ load rate orders of magnitude that encountered in blasting. These results may be relevant to fragmentation by blasting. The resistance of rocks to blasting and the capability to apply the tensile strength tests and interpret them in relation with rock characterization.
Methodology. The direct uniaxial tensile strength, Brazilian test, and point load tests have been applied on rock material drilled out from the vicinity of blasting operation before and after blasting.
Findings. Unlike the point load tests, neither the Brazilian nor the uniaxial strength tests indicated a particular decrease in the strength of the remaining rock material after the blasting. The results of fracture frequency and rock quality designation showed a low degree of the damage caused to the remaining rock in part of the mass near the blast. On the basis of the results from the tests mentioned above, the low degree of the problems faced after the blasting may be explained with reference to the state of discontinuity of the rock material. In addition, the results suggest that more research must be conducted by the use of Brazilian and uniaxial tensile strength tests as methods for characterizing the rock strength for fragmentation.
Originality. The identification of the blastability index from the strength properties of rock and definition of characteristics of the rock strength for fragmentation.
Practical value. The findings obtained based on assessment of the strength properties of the rock can become the basis for the design of blasting in a site.
References.
1. Torabi, S.R., Shirazi, H., Hajali, H., & Monjezi, M. (2013). Study of the influence of geotechnical parameters on the TBM performance in Tehran–Shomal highway project using ANN and SPSS. Arab J Geosci, (6), 1215-1227. DOI:10.1007/s12517-011-0415-3.
2. Zhang, Z.X. (2016), Rock Fracture and Blasting: Theory and Applications. Oxford: Elsevier. DOI:10.1016/C2014-0-01408-6.
3. Zou, D. (2017). Mechanisms of Rock Breakage by Blasting. In: Theory and Technology of Rock Excavation for Civil Engineering. Springer, Singapore. DOI: 10.1007/978-981-10-1989-0_5.
4. Torbica, S., & Lapčević, V. (2015). Estimating extent and properties of blast-damaged zone around underground excavations. Rem: Revista Escola de Minas, (68), 441-453. DOI: 10.1590/0370-44672015680062.
5. Verma, H.K., & Prasad, V. V. R. (2014). Blast Induced Damage to Surrounding Rock Mass in an Underground Excavation. Journal of Geological Resource and Engineering, (2), 13-19. Retrieved from http://cimfr.csircentral.net/id/eprint/1788.
6. Komurlu, E., & Demir, S. (2019). Drilled Core Specimen Testing Method for Determination of Tensile Strength Values of Rock Materials. Periodica Polytechnica Civil Engineering, 63(1), 18-24. DOI:10.3311/PPci.12524.
7. Fuenkajorn, K., & Klanphumeesri, S. (2011). Laboratory Determination of Direct Tensile Strength and Deformability of Intact Rocks. Geotechnical Testing Journal, 34(1), 97-102. DOI:10.1520/GTJ103134.
8. Efimov, V.P. (2016). Tensile strength of rocks by test data on disc-shaped specimens with a hole drilled through the disc center. Journal of Mining Science, 52(5), 878-884.DOI:10.1134/S1062739116041334.
9. Brisevac, Z., Kujundzic, T., & Cajic, S. (2015). Current cognition of Rock Tensile Strength by Brazilian Test. Mining-Geol.-Petrol. Eng. Bull., 30(2), 101-114. DOI:10.17794/rgn.2015.2.2.
10. Fahimifar, A., & Malekpour, M. (2012). Experimental and numerical analysis of indirect and direct tensile strength using fracture mechanics concepts. Bull Eng Geol Environ, 2(71), 269-283.DOI:10.1007/s10064-011-0402-7.
11. Li, D., & Wong, L.N.Y. (2013). The Brazilian disc test for rock mechanics applications: review and new insights. Rock Mech Rock Eng, 46, 269-287. DOI:10.1007/s00603-012-0257-7.
12. Ulusay, R. (2007-2014). The ISRM Suggested methods for rock characterization Testing and Monitoring. Springer International Publishing, Switzerland 2015, pp. 1-293, DOI: 10.1007/978-3-319-07713-0.
13. Ren, F., Liu, H., He, R., Li, G., & Liu, Y. (2018). Point Load Test of Half-Cylinder Core Using the Numerical Model and Laboratory Tests: Size Suggestion and Correlation with Cylinder Core. Advances in Civil Engineering, 1-11. DOI:10.1155/2018/3870583.
14. Kewei Liu, Xudong Lia, Hong Haob, Xibing Lia, Yanyan Shad, Weihua Wanga, & Xiling Liu (2018). Study on the raising technique using one blast based on the combination of long-hole presplitting and vertical crater retreat multiple-deck shots. International Journal of Rock Mechanics and Mining Sciences, 113, 41-58. DOI:10.1016/j.ijrmms.2018.11.012.
15. Kahraman, S. (2014). The determination of uniaxial compressive strength from point load strength for pyroclastic rocks. Engineering Geology, 170, 33-42. DOI:10.1016/j.enggeo.2013.12.009.
16. Perras, M.A., & Diederichs, M.S. (2014). A Review of the Tensile Strength of Rock: Concepts and Testing. Geotechnical and Geological Engineering, 32(2), 525–546. DOI:10.1007/s10706-014-9732-0.
17. Kabilan, N., & Muttharam, M. (2016). Correlation between Unconfined Compressive Strength and Indirect Tensile Strength for Jointed Rocks. International Journal of Research in Engineering and Technology, 5, 157-161, DOI:10.15623/ijret.2016.0505029.
Archive