Experimental Study of the Impact of a Strong Underwater Shock Wave on a Concrete Dam

Abstract:

To study the effect of a strong underwater shock wave on a concrete dam, in this research the hammers impact were applied to simulate the underwater shock in a model test. The model scale was 200 according to the gravity-elasticity similitude law. Five acceleration sensors were imbedded along the downstream surface of the dam. The maximum input pressure was evaluated based on the recorded accelerations. The explosive charge and the distance between the explosion center and the dam were determined corresponding to the maximum impact pressure. After the hammers impacted, the upstream face of the dam was fractured and downstream was scabbed; some cracks extended from the upstream face to the downstream face; the head of dam was projected; and the dam appeared entirely displacement. Although the damage similarity of the model and prototype is not verified, this method may be used to verify the quality of a protection project and offered evidence to define a protection project.

• Periodical: Applied Mechanics and Materials (Volumes 152-154)
• Pages: 1063-1070
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.152-154.1063
• Online since: January 2012
• Authors: Lu Lu, Li Xin, Zhou Jing
• Keywords: Concrete Gravity Dam, Dam Damage, Hammer Impact, Underwater Shock Wave

References

[1] Shi Shaoqing, Zhang Xiangji, et al: Studies On The Properties of ANTI-Pentration of Rigid Polyurethane Foam. China J of Vibration and Shock, (2005), 24(5): PP56-58.

[2] LI Hongbo，ZHANG Wohua and CHEN Yunmin: 3D Finite Element Aanlysis Dynamic Damage in Gravity Dam Under Blast-Impact Load. Chinese J of Rock Mechanics and Engineering, (2006), 25(8): PP1598-1605.

[3] Xu Junxiang, Liu Xila: Full Coupled Simulation of Concrete Dams Subjected to Underwater Explosion. China J of Shang HaiJiaoTong University, (2008. 6), 43(6): PP1001-1004.

[4] Leppanen J: Experiments and numerical analyses of blast and fragment impacts on concrete. Int J Impact Eng, (2005), 43(6): PP843–860.

[5] Georgin J.F., Reynouard J.M.: Modeling of structures subjected to impact: concrete behaviour under high strain rate. Cement&Concrete composites, (2003), 25: PP131-143.

DOI: 10.1016/s0958-9465(01)00060-9

[6] Bischoff PH, Perry SH: Compressive behaviour of concrete at high strain rates. Int J Mater Struct, (1991), 24: PP425–50.

[7] Fang Qin, Qian Qihu: Discussion on the Consideration of the Rate-Sensitivity in Design of Protective Structures. China J of Explosion and Shock waves, (1997. 4), 17(2): PP104-108.

[8] Rajendram R: Linear elasltic shock response of plane plates subjected to underwater explosion[J]. Int J Impact Eng, (2001), 25: PP493-506.

DOI: 10.1016/s0734-743x(00)00056-7

[9] Li Guohua , Li Yu jie and Zhang Xiaoci, et al: Shock Spectrum Measurement and Analysis of Underwater Explosion on a Floating Shock Platform. China J of Ship Mechanics, (2000. 4), 4(2): PP53-60.

[10] Cole, R.H.: Underwater Explosions. Princeton University Press, Princeton. (1948).

[11] Cho-Chung Liang, Yuh-Shiou Taib: Shock responses of a surface ship subjected to noncontact underwater explosions. Ocean Eng, (2006), 33: PP748-772.

DOI: 10.1016/j.oceaneng.2005.03.011

[12] B. E. Gel'fand, K. Takayama: Similarity Criteria for Underwater Explosions. Combustion, Explosion, and Shock Waves, (2004), 40(2): PP214-218.

DOI: 10.1023/b:cesw.0000020144.55275.df