Abstract

Based on elastic theory and assumption of maximum tensile-stress failure criterion, together with construction process of anchor structure and rust expansion critical process, this study proposed a simplified reinforcement rust expansion mechanical model of anchor structure system. Elastic criterion of different initial cracking mode was rewarded under different stress ratios. According to analysis of critical cracking mode of different medium, cracking order of mortar and surrounding rock depended on their material parameters, in-situ stress and thickness of mortar cover. Critical cracking conditions of different medium without effect of in-situ stress was the same as that of considering in-situ stress while k is equal to 3 or 1/3. And engineering example shows that three different cracking modes exist under different stress ratios. The result provides a useful reference for analysis of mechanical deterioration mechanism of anchor structure and design of support structure of underground engineering.

Keywords:

Anchor structure system, critical cracking mode, elastic theory, maximum tensile-stress failure criterion, reinforcement corrosion,

References

1. Almusallam, A.A., A.S. Al-Gahtani, A.R. Aziz and Rasheeduzzafar, 1996. Effect of reinforcement corrosion on bond strength. Construct. Buil. Mater., 10(2): 123-129.
   CrossRef    
2. Basheer, P.A.M., S.E. Chidiact and A.E. Long, 1996. Predictive models for deterioration of concrete structures. Construct. Build. Mater., 10(1): 27-37.
   CrossRef    
3. Chen, H.Z., L.F. Cao, H. Zhang and J. Wei, 2010. Analysis of breaking-down process of rebars corrosion expansion cracking in reinforce concrete. J. Huazhong Univ. Sci. Technol. Nat. Sci., 38(9): 101-103+119.
   
4. Dong, C. and S. Mahadevan, 2008. Chloride-induced reinforcement corrosion and concrete cracking simulation. Cem. Conc. Comp., 30: 227-238.
   CrossRef    
5. Fang, C., K. Lundgren, L. Chen and Z. Chaoying, 2004. Corrosion influence on bond in reinforced concrete. Cem. Concr. Res., 34: 2159-2167.
   CrossRef    
6. He, S.M. and X.Z. Lei, 2007. The mechanism of corroded expansion of grouted bolt. J. SiChuan Univ. Eng. Sci., 39(6): 30-35.
   
7. Jin, W.L., Y.X. Zhao and Y. Fei, 2001. The mechanism of corroded expansion force of reinforced concrete members. Shuili Xuebao, 7: 57-62.
   
8. Shi, J.J. and W. Sun, 2010. Recent research on steel corrosion in concrete. J. Chinese Ceamic Soc., 38(9): 1753-1764.
   
9. Wang, X.L. and J.J. Zheng, 2009. Experimental study of corrosion-induced crack initiation and propagation of reinforced concrete structures. J. Dalian Univ. Technol., 49(2): 246-253.
   
10. Xia, N. and Q.W. Ren, 2006. Numerical simulation of cover layer cracking due to expansion of non-uniform corrosion of reinforcement bar and prediction of corrosion procucts. Shuili Xuebao, 37(1): 70-74.
    
11. Xu, Z.L., 1990. Elastic Mechanics. Higher Education Publishing House, Beijing.
    
12. Xu, Z.Y., 1993. Rock Mechanics. Water Resources and Electric Power Publishing House, Beijing.
    
13. Xu, H., Y.X. Zhang and G.L. Wang, 1990. Analysis of corrosion cracking model of anchorage body in consideration of rock actions. Rock Soil Mech., 31(4): 1193-1198.
    
14. Zeng, X.M., Z.Y. Chen, J.T. Wang and Y. Du, 2004. Research on safety and durability of bolt and cable-supported structures. Chinese J. Rock Mech. Eng., 23(13): 2235-2242.
    
15. Zhao, Y.X. and W.L. Jin, 2002. Test study on bond behavior of corroded steel bars and concrete. J. Zhejiang Univ. Eng. Sci., 36(7): 352-356.
    
16. Zhao, J., W.Z. Ji, X.M. Zeng, B. Liang, B. Zhong and J. Xu, 2007. Experimental study on durableness of anchor with stress corrosion. Chinese J. Rock Mech. Eng., 26(Supp 1): 3427-3431.
    

Competing interests

The authors have no competing interests.

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