An upper bound solution for tunnel face stability analysis considering the free span

2020 ◽  
Vol 103 ◽  
pp. 103515
Author(s):  
Salvador Senent ◽  
Congke Yi ◽  
Rafael Jimenez
Keyword(s):  
Stability Analysis ◽  
Upper Bound ◽  
Tunnel Face ◽  
Face Stability ◽  
Bound Solution ◽  
Upper Bound Solution ◽  
Tunnel Face Stability

Effect of seepage forces on tunnel face stability

2003 ◽  
Vol 40 (2) ◽  
pp. 342-350 ◽  
Author(s):  
In-Mo Lee ◽  
Seok-Woo Nam ◽  
Jae-Hun Ahn
Keyword(s):  
Model Test ◽  
Upper Bound ◽  
Support Pressure ◽  
Seepage Force ◽  
Tunnel Face ◽  
Face Stability ◽  
Seepage Pressure ◽  
Bound Solution ◽  
Upper Bound Solution ◽  
Tunnel Face Stability

In this study, two factors are simultaneously considered for assessing tunnel face stability. The first is the effective stress acting on the tunnel face calculated by upper bound solution, and the other is the seepage force calculated by numerical analysis under the condition of steady-state groundwater flow. The seepage forces calculated by numerical analysis are compared with the results of a model test. The upper bound solution taking into consideration the seepage force acting on the tunnel face, shows that the minimum support pressure for the face stability is equal to the sum of the effective support pressure that is obtained from the upper bound solution based on effective stress and the seepage pressure acting on the tunnel face. It was found that the average seepage pressure acting on the tunnel face is proportional to the hydrostatic pressure at the same elevation, and the magnitude is about 22% of the hydrostatic pressure for the drainage type tunnel and about 28% for the waterproof type tunnel. The seepage forces obtained from the results of a model test showed similar trends as those calculated by numerical analysis.Key words: face stability, upper bound solution, seepage force, model test.

Tunnel face stability analysis using Kinematical Element Method

2019 ◽  
Vol 85 ◽  
pp. 354-367 ◽  
Author(s):  
Mahmoud Qarmout ◽  
Diethard König ◽  
Peter Gussmann ◽  
Markus Thewes ◽  
Tom Schanz
Keyword(s):  
Stability Analysis ◽  
Tunnel Face ◽  
Face Stability ◽  
Tunnel Face Stability ◽  
Element Method

Upper bound analysis of tunnel face stability in layered soils

2013 ◽  
Vol 9 (4) ◽  
pp. 661-671 ◽  
Author(s):  
Xiao-Wu Tang ◽  
Wei Liu ◽  
Bettina Albers ◽  
Stavros Savidis
Keyword(s):  
Upper Bound ◽  
Layered Soils ◽  
Tunnel Face ◽  
Face Stability ◽  
Upper Bound Analysis ◽  
Tunnel Face Stability ◽  
Bound Analysis

scholarly journals Upper bound of tunnel face stability using asymmetric yielding

2018 ◽  
Vol 3 (4) ◽  
pp. 288-296
Author(s):  
Itai Elkayam ◽  
Assaf Klar
Keyword(s):  
Upper Bound ◽  
Tunnel Face ◽  
Face Stability ◽  
Tunnel Face Stability
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