Designing Soil-Nailed Walls Using the Amherst Wall Considering Problematic Issues during Execution and Service Life
Publication: International Journal of Geomechanics
Volume 19, Issue 7
Abstract
Soil nailing is a technique commonly used as a temporary or permanent earth-retention system in soft soils. Habitually, the design of a soil nailing focuses on its performance at failure and computing a safety factor, thus neglecting ground deformations. In this study, an analysis and a comparison of the convenience of the use of the limit-equilibrium method and the FEM for designing a soil nailing were conducted. The assessment considered both the suitability of an easy and fast design process and the necessity to take into account such issues as ground deformations to avoid problematic consequences that can arise during the execution phase and service life. For performing the analyses, a numerical study of the Amherst wall, a full-scale soil-nailed wall built to be an experimental test in the last years of the twentieth century, was carried out. A two-step process for designing soil-nailed walls is proposed. The first step involves the use of limit-equilibrium methods to define the main parameters. The second step deals with the development of a finite-element model to consider ground deformations and determine nail forces. An approach based on the use the Mohr-Coulomb model for simulating materials more similar to granular soils and the hardening soil model for simulating materials more similar to cohesive soils is also presented as an answer for the numerical modeling of soil-nailed walls in ground situations where the soil is neither purely cohesive nor purely granular.
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© 2019 American Society of Civil Engineers.
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Received: Jun 26, 2018
Accepted: Jan 21, 2019
Published online: Apr 24, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 24, 2019
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