Volume 10, Issue 1 (Spring & Summer 2024)
KJES 2024, 10(1): 179-207 |
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Mohammadi V, Bahadori H. Influence of the principal stress rotation on the undrained shear strength of silty sand. KJES 2024; 10 (1) :179-207
URL: http://gnf.khu.ac.ir/article-1-2903-en.html
URL: http://gnf.khu.ac.ir/article-1-2903-en.html
1- Aeen Kamal Higher Education Institute, Urmia, Iran , va.mohammadi@urmia.ac.ir
2- Department of Civil Engineering, Urmia University, Urmia, Iran
2- Department of Civil Engineering, Urmia University, Urmia, Iran
Abstract: (892 Views)
The construction of geotechnical structures in sandy soils requires load bearing evaluation in undrained conditions. Undrained shear strength depends on many factors, including principal stress rotation (anisotropic behavior). However, the effect of this inclination angle (α°) is often ignored due to the difficulty in reflecting this phenomenon in laboratory research, the hollow cylinder torsional shear apparatus provides the possibility of examining the anisotropy of soils. On the other hand, most of the sand sediments contain different amounts of silt particles, which have a significant effect on the behavior of the sand, and investigating the anisotropic behavior of these mixed soils (especially in low content) has not been fully studied. This research includes 18 undrained tests using a hollow cylindrical apparatus on Firoozkuh sand with low silt content. The samples have 0, 5 and 10% silt content. Inclination angle (α°) is considered as a key parameter that shows the characteristics of anisotropy, and the values of 15, 30 and 60° are applied in the experiments. Based on the obtained results, increasing the inclination angle leads to more contractive behavior in sand. By adding a small percentage of layer, the overall structure of the sand skeleton remains constant and the samples can still be evaluated based on the general behavior of the host sand. In the samples containing 5%, reduction of contractive behavior and increase of resistance (18.5%, 12% and 7.7% for angles of 15, 30 and 60°, respectively) are observed, but with an increase of 10%, the strength is decreased (less than the host sand) and the contractive behavior is increased. In anisotropic behavior, with the increase of the inclination angle, the effect of fine grains in increasing the strength and reducing the contractive behavior of the samples as an important parameter in mixed soils is decreased.
Keywords: Anisotropic Behavior, Hollow Cylinder Torsional Shear Apparatus, Firoozkuh Sand, Contractive Behavior
Type of Study: Original Research |
Subject:
Engineering Geology
Received: 2024/06/13 | Accepted: 2024/09/9 | Published: 2024/09/20
Received: 2024/06/13 | Accepted: 2024/09/9 | Published: 2024/09/20
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