Effect of Stress Rotation and Intermediate Stress Ratio on Monotonic Behavior of Granulated Rubber–Sand Mixtures

Ahmad, Ali; Fakharian, Kazem

doi:10.1061/(asce)mt.1943-5533.0003054

Cited by 14 publications

(3 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The moist tamping method developed by Ladd (1978) [45] is a suitable choice for this purpose. This method has been used in most studies on sand mixed with scrap rubbers particles as no evidence of segregation between sand and rubber have been observed (for more details, refer to [46]).…”

Section: Soil Properties and Specimens Preparationmentioning

confidence: 99%

Influence of Initial Anisotropy, Stress Path and Principal Stress Rotation on Monotonic Behavior of Clean and Mixed Sands

Fakharian

Hamedani

2020

KEM

Self Cite

View full text Add to dashboard Cite

It is widely accepted that soil behavior is complicated taking into account soil anisotropy owing to the fact that this phenomenon arises from oriented soil fabric or structure forged in the deposition stage. In this study, a review of major findings of authors’ previous studies are presented with the main focus on soil anisotropy using extensive experimental results incuding Triaxial (TXT), Simple Shear (SSA), and Hollow Cylinder (HCA) apparatus. Effects of initial anisotropy, fabric evolution, stress path, principal stress rotation and intermediate stress state are evaluated for a crushed silica sand. In addition, the effects of Portland cement content and granulated rubber contents on anisotropic behavior of the sand are investigated. Bender elments are mounted on triaxial specimens both in vertical and horizontal directions to measure the shear wave velocity and hence maximum shear modulus at the end of consolidation as well as during shearing up to large strains at critical state condition, as an index of evaluating the fabric evolution. The effects of principal stress rotation and stress paths reveals the crucial role of soil anisotropy on the behavior of clean sand. However, adding either cement or granulated rubber to the sand has considerably decreased anisotropy.

show abstract

Section: Soil Properties and Specimens Preparationmentioning

confidence: 99%

Influence of Initial Anisotropy, Stress Path and Principal Stress Rotation on Monotonic Behavior of Clean and Mixed Sands

Fakharian

Hamedani

2020

KEM

Self Cite

View full text Add to dashboard Cite

show abstract

“…To investigate the shear modulus and damping ratio of granulated sand-crumb rubber mixtures, Fakharian and Ahmad [18] performed cyclic triaxial experiments on samples with different weights of granulated rubber and different consolidation ratios. After loading the samples, 0.002 and 0.004 cyclic shear strain ranges were applied up to 300 cycles [19]. Granulated rubber increased damping ratio (D) and decreased shear modulus in both shear strain ranges.…”

Section: -Introductionmentioning

confidence: 99%

The Effect of Sand-Crumb Rubber Mixture Treatment on the Seismic Response of a Low-Rise Building Located on Liquefiable Soil

Tareghian,

Baradaran,

Akhtarpour

2024

Preprint

View full text Add to dashboard Cite

One of the most effective measures to reduce earthquake risks in high-seismic areas is to reduce the input forces caused by earthquakes to the structure. The properties of rubber materials in geotechnical projects are energy absorption, dynamic deformation change as well as damping of latent energy in loads, high shear modulus and damping ratio, easy access and their economic nature. In this research, with finite difference modeling, the effect of using sand- crumb rubber layer on the seismic behavior of the model has been obtained. In the following, by changing the thickness and depth of the sand-crumb rubber layer, the seismic behavior such as floor displacement and internal forces have been investigated. This research numerically models liquefaction (UBCsand with FLAC) and predicts the effects of the sand-crumb rubber layer of different thicknesses under the foundation and evaluates the structure's damage and settlement interacting with the soil by validating the numerical model with the laboratory model and calibrating it with different ratios. The results show that liquefaction, pore water pressure excess ratio and soil settlement will be significantly reduced with the presence of sand-crumb rubber layer, and also the base shear has shown an increase, but the structural damage is reduced.

show abstract

“…Despite the fact that natural soils are often consolidated under anisotropic conditions, most conventional laboratory tests are performed under isotropic consolidation -instead of anisotropic consolidation -to evaluate the soil strength parameters and stress-strain relations. Moreover, numerous studies have been conducted on the probable consequences of the overlooked initial anisotropy at the consolidation stage and their impacts on the behavior of sands (e.g., Iai et al 1992;Doanh et al 1997Doanh et al , 2012Doanh et al , 2013Dubujet and Doanh 1997;Akira Sato et al 1998;Kato et al 2001;Imam et al 2002a,b;Finge et al 2006;Hareb and Doanh 2012;Rodriguez and Lade 2013;Georgiannou and Konstadinou 2014;Razeghi andRomiani 2015, Ahmad andFakharian 2020).…”

Section: Introductionmentioning

confidence: 99%

Influences of initial anisotropy and principal stress rotation on the undrained monotonic behavior of a loose silica sand

2022

Self Cite

View full text Add to dashboard Cite

Triaxial compression and extension tests have been conducted under different initial anisotropy conditions to investigate the undrained response of a crushed silica sand. The loose to medium specimens were prepared using the moist tamping method. Five stress paths with different stress ratios (q/p^') were employed to prepare anisotropically consolidated specimens. Several specimens were consolidated under a specific condition in which a stress rotation occurred under undrained monotonic shearing similar to a reversed cyclic shear stress loading during an earthquake. The effects of initial induced anisotropy at consolidation on the onset of liquefaction, phase transformation, and critical state are investigated within the framework of Anisotropic Critical State Soil Mechanics (ACSSM). In addition, fabric evolution during shearing towards the critical state is evaluated using bidirectional bender element tests. The results illustrate the fact that there is a unique anisotropic critical state representing anisotropic fabric, irrespective of initial anisotropy, and the states of stress. Similar to the critical state line, the phase transformation line has the same loci for different initial anisotropies.

show abstract

Effect of Stress Rotation and Intermediate Stress Ratio on Monotonic Behavior of Granulated Rubber–Sand Mixtures

Cited by 14 publications

References 47 publications

Influence of Initial Anisotropy, Stress Path and Principal Stress Rotation on Monotonic Behavior of Clean and Mixed Sands

Influence of Initial Anisotropy, Stress Path and Principal Stress Rotation on Monotonic Behavior of Clean and Mixed Sands

The Effect of Sand-Crumb Rubber Mixture Treatment on the Seismic Response of a Low-Rise Building Located on Liquefiable Soil

Influences of initial anisotropy and principal stress rotation on the undrained monotonic behavior of a loose silica sand

Contact Info

Product

Resources

About