JOURNAL OF ROCK MECHANICS

JOURNAL OF ROCK MECHANICS

Design and optimization of tunnel lining at the intersection of Sardasht water transmission tunnel with the Zirmarg active fault

Document Type : Original Article

Authors
1 MSc of Rock Mechanics, Faculty of Engineering, Shahid Bahonar University of Kerman
2 Department of Mining Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman
3 School of Mining Engineering, College of Engineering University of Tehran, Tehran, Iran
Abstract
This paper aims to investigate the effect of the Zirmarg movement, as an active fault, on the stability of water transmission tunnel of Sardasht dam and power plant project. To this end, a preliminary analysis was undertaken on seismicity history of the studied area and then using a finite difference code, stability analyses were carried out at the intersection of tunnel with Zirmarg fault. Results of numerical analyses of fault movement on lining showed that 18 meters of the lining in the footwall and 16 meters in the hanging regions are damaged through the fault movement. To prevent damages on lining, two methods of excessive excavation behind lining and flexible lining were used. The results show that 4 meters excessive excavation behind lining and using a filler having 10 MP modulus of elasticity, the damage to the tunnel lining is minimized. Numerical simulation of flexible lining using 0.5 meters joints with 3 meters distance from each other shows that this method results in 50 percent decrease in the damaged zone length, in addition to significant reduction in tunnel damage intensity.
Keywords
Subjects

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