Experimental Study on Dynamic Responses of a New Type of Debris Flow Dam under Solid Impact Load

Abstract:

Dams can effectively alleviate great debris flow hazards to downstream regions, so they has been widely applied to prevention and control engineering of debris flow disaster now. A kind of steel-concrete combined structure with steel braces was presented based on conventional gravity dams, and the superiority of the new structure in terms of impact resistance was verified contrastively by means of model experiments under solid impact. The results show that braces can restrain cracks and reduce their width, thus the extent of damage in impact areas is alleviated effectively. Compared with the conventional dam, the dynamic strains and acceleration peak values of the dam with braces both observably reduce, and the highest reduction ranges of them may be up to 69.2% and 47.8% respectively, so the deformation and vibration are limited by the braces. The dynamic displacement peak values of the new-type dam are significantly less than the conventional dam, and the average reduction range of this index can reach to about 46%, so the structural stiffness has been enhanced by a large margin.

• Periodical: Applied Mechanics and Materials (Volume 723)
• Pages: 299-308
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.723.299
• Online since: January 2015
• Authors: Jun Jie Li*, Xiu Li Wang, Yan Peng Zhu
• Keywords: Debris Flow Dams, Dynamic Response, Impact Experiments, Solid Mechanics

References

[1] J.K. Wang, R.J. Huang and X.Y. Ding: Prevention-control Engineering and Technology of Debris Flow (China Railway Publishing House, China 1996). (in Chinese).

[2] S.M. He, X.P. Li and Y. Wu: Calculation of Impact Force of Outrunner Blocks in Debris Flow Considering Elastoplastic Deformation. Chinese Journal of Rock Mechanics and Engineering. Vol. 26 (2007), pp.1664-1669 (in Chinese).

[3] W.B. Han and G.Q. Ou: Sediment-intercepting Effect of Slit Dam on Non-viscous Debris Flow: Experimental Study and Comparative Analysis. Journal of Natural Disasters. Vol. 17(2008), pp.152-158 (in Chinese).

[4] H. Huang, D.T. Ma and X.L. Wang: Experimental Study on the Relationships between the Velocity of Debris Flow and Structure of the Dongchuan Debris Flow Channel. Journal of Mountain Science. Vol. 27(2009), pp.551-556 (in Chinese).

[5] Y. You: Characteristics of Intercepting Sediment of Debris Flow Check Dam. Journal of Soil and Water Conservation. Vol. 15(2001), pp.113-115 (in Chinese).

[6] C.L. Shieh, C.H. Ting and H.W. Pan: Impulsive Force of Debris Flow on a Curved Dam. International Journal of Sediment Research. Vol. 23(2008), pp.149-158.

DOI: 10.1016/s1001-6279(08)60014-1