Evaluation the Effect of Blast Pattern on Overbreak Area around the Miyaneh-Ardabil Railway Tunnel | ||
| Journal of Mining and Environment | ||
| مقاله 19، دوره 15، شماره 3، مرداد 2024، صفحه 1149-1160 اصل مقاله (3.92 M) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22044/jme.2024.13911.2591 | ||
| نویسندگان | ||
| Sajjad Khalili1؛ Masoud Monjezi* 1؛ Hasel Amini Khoshalan2؛ Amir Saghat foroush1 | ||
| 1Department of Mining Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran | ||
| 2Department of Mining Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran | ||
| چکیده | ||
| Determining the appropriate blasting pattern is important to prevent any damage to the tunnel perimeter in conventional tunneling by blasting operation in hard rocks. In this research work, the LS-DYNA software and numerical finite element method (FEM) are used for simulation of the blasting process in the Miyaneh-Ardabil railway tunnel. For this aim, the strong explosive model and nonlinear kinematic plastic material model are considered. Furthermore, the parameters required for the Johnson-Holmquist behavioral model are based on the Johnson-Holmquist-Ceramic material model relationships and are determined for the andesitic rock mass around studied tunnel. The model geometry is designed using AUTOCAD software and Hyper-mesh software is applied for meshing simulation. After introducing elements properties and material behavioral models and applying control and output parameters in LS-PrePost software, the modeling process is performed by LS-DYNA software. Different patterns of blastholes including 66, 23, and 19 holes, with diameters of 40 and 51 mm, and depths of 3 to 3.8 m are investigated by three-dimensional FEM. The borehole pressure caused by the ammonium nitrate-fuel oil (ANFO) detonation is considered based on the Jones-Wilkins-Lee (JWL) equation of state in the LS-DYNA software. The outer boundaries of the model are considered non-reflective to prevent the wave’s return. The results showed that LS-DYNA software can efficiently simulate the blasting process. Moreover, the post-failure rate of the blasting is reduced by more than 30% using the main charge with less explosive power and reducing the distance and diameter of contour holes. | ||
| کلیدواژهها | ||
| Drilling and blasting؛ Railway tunnel؛ Finite element method؛ LS-DYNA software؛ Post-failure | ||
| مراجع | ||
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