Shearing and volumetric straining response of Kızılırmak sand

Download
2020-9
Çakır, Elife
The response of sandy soils under monotonic loading depends on size, shape and mineralogy of particles, fabric, stress, and density states of mixtures. Researchers around the world have studied their local sands and calibrated their responses (e.g., Toyoura sand-Japan, Ottawa sand-Canada, Sacramento sand-US, Sydney sand-Australia, etc.). However, there are not many studies that have focused on regional sands from Turkey. This research study aims to introduce a local sand, Kızılırmak sand, to literature as a "standard sand" from Turkey. For this purpose, shear and volumetric straining responses of Kızılırmak sand samples were investigated by a series of consolidated undrained monotonic triaxial and oedometer tests. Specimens with relative densities of 35-45-60-75 and 80 %, were prepared by wet tamping method and consolidated under 50 kPa, 100 kPa, 200 kPa and 400 kPa cell pressures, followed by undrained shearing. Test results were presented by four-way plots, which enable the individual variations of axial load, cell pressure, pore water pressure, and axial deformation along with the progress of the stress paths relative to failure envelopes. On the basis of test results, linear and nonlinear elastic-perfectly plastic constitutive modeling parameters, including but not limited to stress and relative-density dependent modulus and effective stress based angles of shearing resistance, were estimated. Due to its angular nature, Kızılırmak sands' angles of shearing resistance values of 35.4˚-42.8° were observed, which are closer to the upper limits of available literature. Triaxial modulus values fall in the range of ~10 and ~160 MPa and are concluded to be in conformance with available literature. Similarly, samples with varying relative densities, prepared by air pluviation method, were tested in a conventional oedometer device under stresses starting from ~17 kPa increasing up to ~33.5 MPa. During tests, unloading and reloading cycles were performed. Based on these test results, particle crushing-induced yield stresses of Kızılırmak sands along with their Cc, C values were estimated as ~2.1-4.0 MPa, ~2×10-3-1×10-2, and ~1×10-5–1×10-3, respectively. It was concluded that Kızılırmak sand exhibited Type B volumetric compression response as defined by Mesri and Vardhanabhuti (2009). Additionally, test results were also assessed within critical state framework. Critical state framework soil parameters of angle of steady state shearing resistances,  and  values were estimated as 39.4˚, 0.070, and 0.975. Initial dividing line, defining the boundary between strain hardening and softening responses, is determined specific for Kızılırmak sand.

Suggestions

Shearing and volumetric straining response of Kızılırmak sand
Çakır, Elife (2020-10-01)
The response of sandy soils under monotonic loading depends on size, shape and mineralogy of particles, fabric, stress, and density states of mixtures. Researchers around the world have studied their local sands and calibrated their responses (e.g., Toyoura sand-Japan, Ottawa sand-Canada, Sacramento sand-US, Sydney sand-Australia, etc.). However, there are not many studies that have focused on regional sands from Turkey. This research study aims to introduce a local sand, Kızılırmak sand, to literature as a...
Shear and volumetric straining response of çine sand
Korkusuz, Ahmet Can; Çetin, Kemal Önder; Department of Civil Engineering (2021-1-19)
The response of sandy soils under monotonic loading depends on size, shape and mineralogy of particles, fabric, stress and density states of mixtures. Researchers around the world have studied their local sands and calibrated their responses (e.g., Toyoura sand-Japan, Ottawa sand-Canada, Sacramento sand-US, Sydney sand-Australia, etc.). However, there are not many studies that have focused on regional sands from Turkey. This research study aims to introduce a local sand, Çine sand, to literature as a "stand...
Hipoplastik Bünye Model Parametrelerinin Kumlu Zeminler İçin Belirlenmesi
Bayraktaroğlu, Hilmi; Taşan, Ercan; Huvaj Sarıhan, Nejan (2018-09-26)
Sonlu elemanlar yönteminde yapılan hesapların doğruluğu ve hassasiyeti, başka faktörlerin yanı sıra, kullanılan zemin bünye modeline bağlıdır. Hâlihazırda kullanılmakta olan çeşitli bünye modelleri (örneğin Duncan-Chang, Cam Clay vb.) mevcut olup bu modellerden biri de son yıllarda zeminler için kullanımı giderek yaygınlaşan hipoplastik bünye modelidir. Zemin gerilme seviyesinin ve birim hacim ağırlığı değişiminin zemin davranışı üzerindeki etkisinin özellikle göz önünde bulundurulduğu hipoplastik bünye mod...
Growth of gold films on quartz surfaces for quartz crystal microbalance application
Özkan, Berrin; Danışman, Mehmet Fatih; Department of Chemistry (2010)
In this study, we have investigated the effect of substrate temperature, use of adhesive layer, deposition rate, annealing and substrate prebaking on the morphology of gold films deposited onto quartz surfaces. For the film growth, physical vapor deposition methods namely electron beam and thermal depositions have been used. Surface morphology of the films have been characterized with atomic force microscopy. Our aim was to confirm the general trends observed for these parameters in our evaporator system fo...
Development of amperometric glucose biosensors based on conducting polymers and different materials providing enhanced performance
Gökoğlan, Tuğba Ceren; Toppare, Levent Kamil; Department of Chemistry (2016)
The main objective of this study is to investigate breakage parameters of a narrow size fraction of coarse particles of a hard mineral when ground in a mixture with fine particles of a soft mineral. For this purpose, quartz and calcite were selected as mixture components varying appreciably in hardness (quartz mohs scale:7 and calcite mohs scale:3) but having quite similar densities. Mixture feeds comprised of -1.18+0.85 mm quartz (hard and coarse) and -106 µm calcite (soft and fine) at various proportions ...
Citation Formats
E. Çakır, “Shearing and volumetric straining response of Kızılırmak sand,” M.S. - Master of Science, Middle East Technical University, 2020.