Effect of Surface Blasting on Subway Tunnels- A Parametric Study | ||
| روش های تحلیلی و عددی در مهندسی معدن | ||
| مقاله 24، دوره 6، ویژه نامه انگلیسی، بهمن 1395، صفحه 63-72 اصل مقاله (1.45 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| Hossein Entezari Zarch؛ Kazem Barkhordari* | ||
| Dept. of Civil, Yazd University, Iran | ||
| چکیده | ||
| During wars and crises, the underground tunnels are used as a safe space. Therefore, the stability and safety of them under a blast is of particular importance. In this paper, the Finite Difference Method has been used to study the influence of the change in geotechnical parameters and depth on surface blasting on subway tunnels. Results showed that increasing the internal friction angle, modulus of elasticity and cohesion of the soil reduced the effects of blast loads on the vertical displacement and bending moment in the center of tunnel crown. Furthermore, the results showed that increasing the depth of the tunnel reduced the effects of blast loading. Comparing all parameters collectively showed that the increase in the modulus of elasticity of the soil and depth of the tunnel is the most effective in reducing the influence of the blast loads on the vertical displacement and bending moment of the tunnel crown, respectively. | ||
| کلیدواژهها | ||
| Blast Loading؛ Subway Tunnels؛ finite difference method؛ dynamic analysis | ||
| عنوان مقاله [English] | ||
| Effect of Surface Blasting on Subway Tunnels- A Parametric Study | ||
| نویسندگان [English] | ||
| Hossein Entezari Zarch؛ Kazem Barkhordari | ||
| Dept. of Civil, Yazd University, Iran | ||
| چکیده [English] | ||
| During wars and crises, the underground tunnels are used as a safe space. Therefore, the stability and safety of them under a blast is of particular importance. In this paper, the Finite Difference Method has been used to study the influence of the change in geotechnical parameters and depth on surface blasting on subway tunnels. Results showed that increasing the internal friction angle, modulus of elasticity and cohesion of the soil reduced the effects of blast loads on the vertical displacement and bending moment in the center of tunnel crown. Furthermore, the results showed that increasing the depth of the tunnel reduced the effects of blast loading. Comparing all parameters collectively showed that the increase in the modulus of elasticity of the soil and depth of the tunnel is the most effective in reducing the influence of the blast loads on the vertical displacement and bending moment of the tunnel crown, respectively. | ||
| کلیدواژهها [English] | ||
| Blast Loading, Subway Tunnels, finite difference method, dynamic analysis | ||
| مراجع | ||
|
[1] Smith, J. L.; Betz, J. F.; Baird, G. T; Kachina Test Series: Dynamic Arch Test Three (DAT-3) Analysis Report, Final Report, 1986, AFWL-TR-85-36, Air Force Weapons Laboratory, Kirtland AFB. [2] Dallriva, F. D.; Data Report for FY86 Dynamic Shallow Buried Arch Test, 1989; U.S.A.E, Waterways Experiment Station, Vicksburg. [3] Blanchat, T. K.; Development of Explosive Event Scale Model Testing Capability at Sandia's Large Scale Centrifuge Facility, 1998; Sandia National Laboratories. [4] Ohno, T.; Study on Structural Response to Explosion of Explosives and Blast Resistance Design, 2008; National Defense Academy of Japan. [5] De, A.; Zimmie, T. F.; Abdoun, T.; Tessari, A.; “Physical Modeling of Explosive Effects on Tunnels”, Geotech Test J, 2010; 30, 5, 427-431. [6] Ishikawa, N.; Beppu, M.; “Lessons from Past Explosive Tests on Protective Structures in Japan”, Int J Impact Eng, 2006; 34, 1535–1545. [7] Sadegh azar, M.; Atarnezhad, R.; Khosravi, A.; “Evaluating the Response of Buried Reinforced Concrete Structures Under Surface Burst Explosion Using Numerical Simulations”, In Proc. of the International Conference on Structures - Earthquake – Geotechnics, 2010; 212-222 (In Persian). [8] Yang, Z.; “Finite Element Simulation of Response of Buried Shelters to Blast Loadings”, Finite Elem Anal Des, 1997; 24, 3, 113-132. [9] Gui, M. W.; Chien, M. C.; “Blast Resistant Analysis for a Tunnel Passing Beneath Taipei Shongsan Airport – A Parametric Study”, Geotechnical and Geological Engineering, 2004; 24, 227–248. [10] Liu, H.; Dynamic Analysis of Subway Structures Under Blast Loading, Department of Civil Engineering, 2009; The City College of New York/CUNY,New York, NY 10031 USA. [11] Esmaeili, M.; Falahzadeh, P.; “Behavior of Underground Structures Under Explosion Loads (Case Study - Tehran Metro)”, In Proc. of the 8th. International Conference on Tunnel, 2009; 344-353 (In Persian). [12] Nagy, N. M.; Eltehawy ,E. A.; Elhanafy, H. M.; Eldesouky, A.; “Numerical Modeling of Geometrical Analysis for Underground Structures”, 13th International Conference on Aerospace Sciences & Aviation Technology, 2009; ASAT- 13, Egypt. [13] Nagy, N. M.; Mohamed, M.; Boot, J.C.; “Nonlinear Numerical Modelling for the Effects of Surface Explosions on Buried Reinforced Concrete Structures”, Geomechanics and Engineering Journal, 2010, 2, 1, 1-18. [14] Hashemi, H. R.; Mirzeynali, S. H.; Effect of Projectile Explosion on the Metro Tunnels in the Coarse Soil with Finite Difference Software FLAC (Case Study: Karaj Metro Tunnel). 2009, Technical Report, University of Maleke Ashtar, Tehran (In Persian). [15] Lu, Y.; Wang, Zh.; Chong, K.; “A Comparative Study of Buried Structure in Soil Subjected to Blast Load Using 2D and 3D Numerical Simulations”, Soil Dyn Earthq Eng, 2005, 25, 275–288. [16] Ngo, T.; Mendis, P.; Gupta, A.; Ramsay, J.; “Blast Loading and Blast Effects on Structures – An Overview”, Electronic Journal of Structural Engineering, 2007, 7, 76-91. [17] Unified Facilities Criterias (UFC); Structure to Resist the Effects of Accidental Explosions, 2008, UFC 3-340-02, U. S. ARMY. [18] Smith, P. D.; Hetherington, J. G.; Blast and Ballistic Loading of Structures, Butterworth-Heinemann, 1994. [19] Brill,A.; Me-Bar, Y.; Sadot, O.; Ben-Dor, G.; “A method for measuring the impulse on structural foundations due to a blast wave”, Int J Impact Eng, 2012, 49, 214-221. [20] Kinney, G.F.; Graham K.J. ; Explosive Shocks in Air, Springer- Verlag, Berlin, 1985. [21] Ambrosini, D.; Luccioni, B.; Danesi, R.; “Craters Produced by Explosions on the Soil Surface”, Mechanical Computational, XXII, 2003, 678-692. [22] Luccioni, B.; Ambrosini, D.; “Influence of the Soil Properties on Craters Produced by Explosions on the Soil Surface”, Mechanical Computational, 2004, XXIII, 571-590. | ||
|
آمار تعداد مشاهده مقاله: 580 تعداد دریافت فایل اصل مقاله: 968 |
||