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Nabi Kartal Toker

Department of Civil Engineering
Simulation of hysteresis in soil-water retention with a correlation between the invading pressure to the governing effective flow area
Sattari, Amir Shoarian; Siebelist, Marlena; Toker, Nabi Kartal; Wuttke, Frank (Springer Science and Business Media LLC, 2020-03-23)
In order to determine the soil-water retention (SWR) behavior of a particulate medium, the invading phase pressure in the inter-particle level is correlated to the governing effective pore area in the wetting and drying pa...
A New Isotropic Specimen Preparation Method from Slurry for both Saturated and Unsaturated Triaxial Testing of a Low-Plasticity Silt
Ahmadi-Naghadeh, Reza; Toker, Nabi Kartal (ASTM International, 2019-07-01)
A new procedure for the preparation of low-plasticity silt specimens that are isotropically reconstituted from slurry is developed for use in both saturated and unsaturated soil testing. Spatial variations of the water con...
Effect of Unsaturated Soil Properties on the Intensity-Duration Threshold for Rainfall Triggered Landslides
Kenanoğlu, Melih Birhan; Ahmadi-Adli, Mohammad; Toker, Nabi Kartal; Huvaj Sarıhan, Nejan (Teknik Dergi, 2019-03-01)
Rainfall triggered landslides are one of the most common natural hazards in many countries throughout the world, as well as in Turkey. This study investigates the effect of unsaturated soil properties on landslide-triggeri...
A Formulation for Scanning Soil-water Characteristic Curves
Kenanoğlu, Melih Birhan; Toker, Nabi Kartal (2018-10-01)
Rainfall-triggered landslides in an unsaturated soil: a laboratory flume study
Ahmadi-Adli, Mohammad; Huvaj Sarıhan, Nejan; Toker, Nabi Kartal (2017-11-01)
Extreme and/or prolonged rainfall events frequently cause landslides in many parts of the world. In this study, infiltration of rainfall into an unsaturated soil slope and triggering of landslides is studied through labora...
Volume Change Measurement in Triaxial Tests by Monitoring Cell Fluid Volume Based on Viscoelastic Behavior of the Test Setup
Ahmadi-Naghadeh, R.; Toker, Nabi Kartal (2017-07-01)
A novel procedure was developed to measure the total volume change of the unsaturated soils in triaxial testing. The principle of the proposed method was based on cell fluid volume measurements corrected by the assumption ...
Obtaining soil-water characteristic curves by numerical modeling of drainage in particulate media
Sattari, A. Shoarian; Toker, Nabi Kartal (Elsevier BV, 2016-04-01)
Soil-water characteristic curve (SWCC) is widely used for obtaining mechanical and hydraulic properties of unsaturated soils, such as shear strength, deformation, permeability, and flow. An innovative approach, where a mes...
Effective Stress and Shear Strength of Moist Uniform Spheres
Toker, Nabi Kartal; Germaine, John T.; Culligan, Patricia J. (Wiley, 2014-05-01)
In continuum soil mechanics, the mechanical behavior of an element of soil is related to the effective stress, which is a measure of the average stress transmitted through the solid matrix in the form of contact stresses. ...
Effects of the size of particles on rainfall-induced slope instability in granular soils
Ahmad-Adli, Mohammad; Huvaj, Nejan; Toker, Nabi Kartal (2014-02-26)
Rainfall-triggered landslides is a common natural hazard with significant consequences all over the world. Most available methods for predicting rainfall-triggered landslides are based on regional statistical data of past ...
Effects of the size of particles on rainfall induced slope instability in granular soils
Ahmadi-Adli, Mohammad; Huvaj Sarıhan, Nejan; Toker, Nabi Kartal (2014-02-23)