Iterative Horizontal Method of Slices for Global Stability of Slurry Trench in Layered Cohesive-Frictional Soils
Publication: International Journal of Geomechanics
Volume 23, Issue 2
Abstract
This paper presents an iterative horizontal method of slices (iterative HMS) for the global stability analysis of a slurry trench in layered cohesive-frictional soils. The iterative HMS differs from existing HMS models in terms of the assumptions on interslice forces. Preceding HMS techniques postulate that normal interslice forces can be evaluated from overburden pressures, which can lead to the violation of failure criteria along interslice boundaries. The iterative HMS ensures that a limit equilibrium system is established without violating the failure criterion throughout the entire soil mass. This is achieved by iteratively adjusting interslice forces by means of enforcing the failure criterion for the aforementioned problematic slice boundaries violating the failure conditions. The performance of the iterative HMS is evaluated in example problems of a slurry trench in uniform clayey soils and cohesive-frictional strata. The results are compared against solutions obtained using finite-element limit analysis (FELA) and a shear strength reduction FEM (SSRFEM). This comparative analysis shows that the adjustment in interslice forces is important for reasonably assessing trench stability conditions. A parametric analysis is performed by using the iterative HMS to show under what trench construction parameters the adjustment of interslice forces cannot be neglected in the stability analysis of a slurry trench.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Grant No. 51738010) and the National Key R&D Program of China (Grant No. 2016YFC0800200). These sources of support are acknowledged.
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Information
Published In
International Journal of Geomechanics
Volume 23 • Issue 2 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Apr 23, 2022
Accepted: Sep 6, 2022
Published online: Nov 23, 2022
Published in print: Feb 1, 2023
Discussion open until: Apr 23, 2023
ASCE Technical Topics:
- Analysis (by type)
- Continuum mechanics
- Diaphragm walls
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Failure analysis
- Finite element method
- Friction
- Geomechanics
- Geotechnical engineering
- Layered soils
- Methodology (by type)
- Numerical methods
- Soil analysis
- Soil dynamics
- Soil mechanics
- Soil properties
- Soil stabilization
- Soils (by type)
- Solid mechanics
- Structural engineering
- Structural members
- Structural systems
- Trenches
- Trenchless technology
- Tunneling
- Tunnels
- Walls
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