University of Tehran
Faculty of Engineering, School of Civil Engineering
Among devices commonly used to measure the shearing behavior of sands, only the ring shear device can shear a soil to virtually unlimited displacements without creating substantial nonuniformities in stress and strain distributions.... more
The critical state (or critical void ratio) line is the locus of void ratio-effective stress conditions achieved after shearing a soil to large displacement and after all net void ratio changes and effective stress changes are complete.... more
Modeling groundwater flow is a vital process to estimate the patterns of flow, salinity, and temperature distributions and the suitable regions for obtaining water for drinking, agriculture, industry, and electrical power generation can... more
In this paper, particle damage of three test sands with different mineralogical compositions is studied using stress-displacement response measured in ring shear tests, particle size distributions of the original sand prior to shear and... more
The excess pore water pressure developed in the Upper San Fernando Dam during the 1971 San Fernando Earthquake has been evaluated in several studies. Almost all of these studies indicate large excess pore pressure ratios developed only in... more
Shear band formation is an important factor in understanding failures in soil. In this paper, shear localization and shear band formation and evolution are examined using ring shear tests performed on three sands prepared by air... more
The friction angle of sands is the most important parameter used for analyzing the response of sands to loading. However, its variation with stress level, fabric, and particle damage has been debated. This study examines the yield and... more
In this study we performed 26 undrained triaxial compression and 32 constant volume ring shear tests on two clean sands and one silty sand. We then used these results to evaluate the critical states, and shear strength ratios mobilized at... more
Cone penetration testing (CPT) has become the industry standard for in situ testing of cohesionless soils, and in particular, field liquefaction evaluation. The empirical methods for the interpretation of CPT data are either based on... more
The 1971 San Fernando earthquake led to the failure and large displacement of the Lower San Fernando Dam (LSFD) that was constructed by the hydraulic filling method. As such, hydraulic filling has been recognised as producing liquefiable... more
Reactive Powder Concrete (RPC) is an ultra-high-strength, high ductility and low porosity cementitious material. RPC properties are improved by pressing fresh RPC samples, which can increase its specific weight as high as 3000 kg/m3.... more
Very few studies have investigated soil shear modulus and damping characteristics at very shallow depths (< 3 m). In this study, average shear stress and strain histories are determined from reduced-scale shaking table model... more