Bond interface crack propagation of fresh foundation concrete and rock under blasting load
Tóm tắt
According to concrete age, the dynamic stress intensity factors of bond interface crack of concrete-rock was calculated. Result shows that the propagation of concrete interface crack is mainly caused by tensile stress and shear stress for stress wave reflection. With the growth of concrete age, interface crack fracture toughness increases, and its capacity of resisting blasting load strengthens. Therefore, blasting vibration should be strictly controlled for fresh concrete.
Tài liệu tham khảo
Chen M, 2006. Study on the influence of blasting vibration upon freshly placed concrete structure. Wuhan University.
Chen M, Lu W B, Luo T Y, 2003. Influence factors of blasting vibration on safety criterion for the freshly placed foundation concrete. Journal of Yangtze River Scientific Research Institute, 20(S1): 11–14.
Fan T Y, 2006. Principles and applications of dynamic fracture. Beijing: Beijing Institute of Technology Press.
Kcaoglu T, Tokyay M, Celik T, 2002. Effect of coarse aggregate size on the interfacial cracking under uniaxial compression. Materials Letters, 57: 828–833.
Li Z, Liu M S, Zhang J S, 2001. Experimental study on fracture criterion of rock-concrete interface and breaking energy. Journal of Shanxi water Power, 17(4): 35–37.
Li Z, Yang S C, Zhang H B, 1998. Fracture toughness and breaking energy of rock-concrete interface. Water Resources & Water Engineering, 9(1): 42–45.
Li Z, Zhang H B, Jian Z, 1997. Study on fracture criterion of rock-concrete interface. Journal of Dalian University of Technology, 37(S1): 57–60.
Lu W B, Chen M, 2003. Study on safety vibration velocity caused by blasting for fresh placing foundation concrete. Journal of Yangtze River Scientific Research Institute, 20(S1): 8–10.
Wu L, Lu W B, 2007. The analysis of dynamic stress intensity factors of rock under pre-split blasting loading. Rock and Soil Mechanics, 27(S2): 791–794.
Yin S Z, 1996. The application of fracture criteria in concrete project. Beijing: Science Press.