Numerical investigation of the impact of rock mass properties on propagation of ground vibration
- 45 Downloads
Ground vibrations induced by the blasting of explosives can cause damage to the slope stability of mines. The important indicators of rock mass such as the geological discontinuities, physical and mechanical properties of rock can affect the creation and prediction of blast damage. This paper aims to assess the simultaneous effects of the above properties. For that purpose, peak particle velocity as the indicator of damage at two rock slopes was examined through a three-dimensional distinct element code (3DEC). The developed model simulated the dynamic pressure of detonation and provided useful results for analysis. The qualitative analysis demonstrated how significant it is to incorporate the rock mass properties in the model. Moreover, a statistical analysis was performed to quantify the effects of these properties. Therefore, the distance from blast, dip/direction of discontinuities, blast damage factor (Hoek–Brown failure criterion) and Geological Strength Index have the most influences on the slope damage, respectively. The moment failure analysis of 3DEC explained the Shear–Tension and Shear–Shear failures associated with the rock mass damage caused by blasting. The dip/direction of discontinuities plays a major role in the control or propagation of dynamic pressure and should be considered in blast damage control. If necessary, artificial discontinuities such as pre-splitting should be employed for better control and use of the favorable effects of geological discontinuities.
KeywordsGeological discontinuities Geological Strength Index Slope stability Three-dimensional distinct element code Blast damage control
The cooperation of Mr. Kambiz Moazami, managing director of Kanikavan Shargh Engineering Co., and Mr. Mohammad Abrishami, Manager of Chadormalu Industrial and Mining Complex, in providing the required information of rock mechanics of Chadormalu iron ore mine is highly appreciated.
- Adhikari GA, Rajan B, Venkatesh HS, Thresraj AI (1994) Blast damage assessment for underground structures. In: Proceedings of the national symposium on emerging mining and ground control technologies, Varanasi, India, pp 247–55Google Scholar
- Bender WL (2007) Understanding blast vibration and airblast, their causes, and their damage potential. Workshops of the golden west chapter of the International Society of Explosives EngineersGoogle Scholar
- Hoek E (2012) Blast damage factor. Technical note for RocNews. Winter 2012 Issue. available in https://www.rocscience.com
- Hoek E, Carter TG, Diederichs MS (2013) Quantification of the Geological Strength Index chart. In: 47th US rock mechanics/geomechanics symposium held in San Francisco, CA, USAGoogle Scholar
- Hudson IA (ed) (1993) Comprehensive rock engineering: excavation, support and monitoring, vol 4. Pergamon Press, OxfordGoogle Scholar
- Hustrulid WA (1999) Blasting principles for open pit mining: general design concepts. Balkema, RotterdamGoogle Scholar
- Jong Y, Lee C, Jeon S, Cho YD, Shim DS (2005) Numerical modelling of the circular-cut using particle flaw code. In: 31st annular conference of explosives and blasting technique, Orlando, CO., USAGoogle Scholar
- Kanikavan Shargh Engineering Co, SRK Consulting (South Africa) (2016) Extension pit design, phase III- open pit mine design. Report number 1044REMG10700Google Scholar
- Resende JRP (2010) An investigation of stress wave propagation through rock joints and rock masses. Ph.D. thesis. Universidade do Porto, PortugalGoogle Scholar
- Roy PP (1991) Prediction and control of ground vibrations due to blasting. Colliery Gaurdian 239(7):215–219Google Scholar
- Zhang ZX (2016) Rock fracture and blasting: theory and applications. Elsevier Science, OxfordGoogle Scholar