Upper bound solutions of stability factor of shallow tunnels in saturated soil based on strength reduction technique

2012 ◽  
Vol 19 (7) ◽  
pp. 2008-2015 ◽  
Author(s):  
Fu Huang ◽  
Dao-bing Zhang ◽  
Zhi-bin Sun ◽  
Qi-yun Jin
Keyword(s):  
Upper Bound ◽  
Strength Reduction ◽  
Reduction Technique ◽  
Saturated Soil ◽  
Stability Factor ◽  
Shallow Tunnels ◽  
Strength Reduction Technique

Limit Analysis of Slopes Reinforced with Multi-Directional Anchors

2014 ◽  
Vol 501-504 ◽  
pp. 27-31
Author(s):  
Ting Kai Nian ◽  
Kai Liu ◽  
Yan Jun Zhang ◽  
Dong Wang
Keyword(s):  
Upper Bound ◽  
Limit Analysis ◽  
Strength Reduction ◽  
Reduction Technique ◽  
Upper Bound Method ◽  
Optimal Angle ◽  
Strength Reduction Technique ◽  
Parametric Studies ◽  
Earth Slope ◽  
The Stability

The upper-bound method of limit analysis combined with strength reduction technique is employed to analyze the stability of an earth slope reinforced with multi-directional anchors. A homogeneous and isotropic earth slope reinforced with two rows of anchors is considered. Attempts are made to obtain the optimal angles of anchors. Parametric studies show that, for homogeneous and isotropic slopes, the optimal angle of the first row of anchors is 0°; while the optimal angle of the second row of anchors varies with anchor positions, and generally is less than 15°.

scholarly journals Estimating the Basal Heave Stability of Narrow Braced Excavations

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Taoli Xiao ◽  
Yanlu Yang ◽  
Hua Cai ◽  
Shaoxin Yan ◽  
Fang Cao
Keyword(s):  
Circle Method ◽  
Strength Reduction ◽  
Reduction Technique ◽  
Design Codes ◽  
Computation Model ◽  
Strength Reduction Technique ◽  
Braced Excavations ◽  
Engineering Practices ◽  
Basal Heave ◽  
Shear Strength Reduction

Engineering practices indicate that narrow braced excavation exhibits a clear size effect. However, the slip circle method in the design codes fails to consider the effect of excavation width on basal heave stability, causing waste for narrow excavation. In this paper, numerical simulation for basal heave failure of excavation with different widths was performed by FEM with SSRT (shear strength reduction technique). The results revealed that the failure mechanism of narrow excavation is different from the complete slip circle mode. In addition, the safety factor decreases increasingly slowly as the excavation widens and stabilizes when approaching the critical width. Subsequently, the corresponding computation model was presented, and an improved SCM (slip circle method) was further developed. Finally, the engineering case illustrated that it can effectively optimize the design, which exhibits clear superiority.

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