Development Analysis of I-Longitudinal Crack in the Vault of Underwater Tunnel Secondary Lining

Abstract:

Article Preview

In this paper secondary lining of an underwater tunnel which had appeared I-longitudinal crack was taken as study object according to theory of fracture mechanics. Finite Element analysis was carried out to calculate the stress intensity factor at the tip of I-longitudinal crack which located in vault, then to analyze the extended state of crack based on double-K fracture criteria. The computation results indicate that the stress intensity factor at the tip of I-longitudinal cracks which appear within 20 degrees of the vault do not exceed unstable fracture toughness, lining is in stable growth stage and do not occur instable failure. The stress intensity factor at the tip of I-longitudinal cracks appeared in vault is maximum and appeared in both side of vault is minor, the further away from vault the less of stress intensity factor. When water level below the top of tunnel, with the rise of water level the stress intensity factor at the tip of I-longitudinal decrease and the external water pressure has restrain effect to the crack extension. When water level exceed the top of tunnel, with the rise of water level the stress intensity factor at the tip of large depth of crack decrease rapidly until arrive negative value, then increase backward until greater than unstable fracture toughness and cause lining structural local instable failure.

Info:

Periodical:

Edited by:

Xuejun Zhou

Pages:

2472-2476

Citation:

W. Wang et al., "Development Analysis of I-Longitudinal Crack in the Vault of Underwater Tunnel Secondary Lining", Applied Mechanics and Materials, Vols. 90-93, pp. 2472-2476, 2011

Online since:

September 2011

Export:

Price:

$41.00

[1] Zou Chong, Luo Qiong, Li Zhiguo, Yang Yong. Techniques for tackling lining cracks and leakages in Yuanliangshan tunnel [J]. (Modern Tunnel Technology, 2004, 41(5): 52-57, 64).

[2] Li Guhua, Guo Jianguo. The causes inducing crack and water leakage in tunnel lining and its prevention and treatment [J]( Railway Engineering, 2003(1): 23-25).

[3] Wang Hualao, Liu Xuezeng, LI Ning, Xie Dongwu. Safety Evaluation of Tunnel Lining with Longitudinal Cracks and Reinforcement Design[J](Chinese Journal Of Rock Mechanics And Engineering, 2010, 29(z1): 2651-2656).

[4] Xu Shiliang, Liu Jianqiang etc. Double-K fracture theoretical analysis and crack width calculation of hydraulic pressure tunnel lining [J] (China Civil Engineering Journal,2010. 43(1)114-124).

[5] Dai ChengYuan, HAN Ting. Crack analysis and its propagation of the tunnel concrete lining [J](Geotechnical Engineering World, 2005, 8(12): 71-73).

[6] Xu Shilang. The Standard Methods of Fracture Toughness Measurement and Fracture Test of Concrete [M]. (China Machine Press, 2010).

[7] The People's Republic of China Ministry of Railways. TB10003-2005. Code for Design on Tunnel of Railway [S](China Railway Publishing House. 2005).

[8] Wang Jianxiu, Yang Lizhong, He Jing. Introduction to the Calculation of External Water Pressure of Tunnel Lining [J] (Chinese Journal of Rock Mechanics and Engineering, 2002, 21(9): 1339-1343).

[9] ZHU bofang. The Finite Element Method Theory And Applications [A] (China Waterpower Press, BeiJing, 1997. 400-404).