Study on FEM Numerical Simulation and Strain Monitoring of Tunnel Secondary Lining

Abstract:

Safety of secondary lining is of utmost importance to tunnel engineering quality as the main load-bearing structure and the last waterproof line of rock tunnel under type III. The comparative study of strain state results from FEM numerical simulation and on-site monitoring in Yunnan Tianxin Tunnel was conducted to obtain the stress regularity of tunnel lining. The results showed that except vault, the strain states of secondary lining obtained by numerical simulation and on-site monitoring were consistent. The strain value of on-site monitoring was approximately 60%~70% to the simulation value. And the strain value of right side was greater than the value of the corresponding location on the left side. It’s noticed that high strain were found in tunnel haunch and arch springing. Great attention should be paid to arch springing for the largest strain value. The strain monitoring value of vault (309.83με~327.23με) has been detected larger than simulation value (209.37με), which matches well the crack phenomenon of vault. Therefore it’s significant to focus on the long-term monitoring of vault. The defects of single on-site monitoring method such as poor predictability were made up effectively by comparative study. The results achieved can be recommended for similar projects.

• Periodical: Applied Mechanics and Materials (Volumes 580-583)
• Pages: 1105-1111
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.580-583.1105
• Online since: July 2014
• Authors: Ying Na Li, Meng Liu, Sheng Wu, Hao Liu, Jian Kun Su, Zhi Lin Zhang, Chuan Li*
• Keywords: FEM Numerical Simulation, Secondary Lining, Separated Tunnel, Strain on-Site Monitoring, Tunnel Engineering

References

[1] Keguo Sun, Shucai Li, Qingsong Zhang, et al. Chinese Journal of Rock Mechanics and Engineering, 2007, 26 (z2): 4465-4470.

[2] JTG D70-2004, Code for Design of Road Tunnel[S], (2004).

[3] Tingjin Liu, Hehua Zhu, Wenqi Ding. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(2): 75-78.

[4] Tai Bao, Yue Shui. Journal of Guizhou University(Natural Sciences), 2009, 26 (4): 131-133.

[5] Yongqiang Yu, Yaobang Lu, Weinian Zhong, et al. Highway Engineering, 2011, 36 (4): 1-3.

[6] Zhe Hao, Wei Li, Bin Liu. West-China Exploration Engineering, 2005, (2): 96-98.

[7] Zhewen Xu. Journal of Transportation Systems Engineering and Information Technology, 2008, 8(4): 127-131.

[8] Changxiang Liu, Changxin Lu. Chinese Journal of Underground Space and Engineering, 2007, 3(4): 688-692.

[9] Xiaowang Zhang, Jinsheng Nie. Highway Engineering, 2008, 33(5): 99-103.

[10] Yang Zhao, Weibi Wang, Changneng Yang. Central South Highway Engineering, 2005, 30(2): 181-184.

[11] Feng Gao, Chang-xin Sun. China Journal of Highway and Transport, 2010, 23(4): 70-77.

[12] GB 50010-2010, Code for Design of Concrete Structures[S], (2010).

[13] TB/T 3209-2008, Technical Regulations for Hollow Bolt[S], (2001).