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Combination of water head control and axis translation techniques in new unsaturated cyclic simple shear tests
, Article Soil Dynamics and Earthquake Engineering ; Volume 126 , 2019 ; 02677261 (ISSN) ; Jafarzadeh, F ; Sadeghi, H ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
A cyclic simple shear device was modified for testing coarse-grained soils at unsaturated conditions. A combined methodology of controlling suction for the practical range of coarse-grained soil water retention curves was adopted. Water head control method was used to accurately control suction within capillary and transition zones of such soils. The axis translation technique, on the other hand, was employed as a complementary approach to reach higher suction values within residual zone. In order to evaluate the performance of the new setup, independent cyclic tests were carried out at various initial suctions including all key points and zones along the primary drying path. The analyses of...
A New Testing Approach to Evaluate the Role of Unsaturated Stress State Variables and Degree of Saturation of Infill Materials on the Behavior of Infilled Rock Fractures
, M.Sc. Thesis Sharif University of Technology ; Khosravi, Ali (Supervisor)
Abstract
Theoretical and experimental studies have shown that natural fractures may exhibit capillary behavior because of either their wall-roughed nature or presence of partially saturated fine materials within the fractures. Different factors are expected to affect the capillary behavior and consequently the hydraulic and mechanical properties of fractures including topology of void spaces in fractures, and state of stress of infill materials and their initial innate conditions (e.g., void ratio, water content, degree of saturation and dry density). Therefore, comprehensive characterization of their hydro-mechanical behavior requires knowledge of morphological details of fracture surface, as well...
Hydraulic Behavior of Infilled Fractured Rocks under Unsaturated Conditions
, Article Joint Geotechnical and Structural Engineering Congress 2016, 14 February 2016 through 17 February 2016 ; 2016 , Pages 1708-1718 ; 9780784479742 (ISBN) ; Mousavi, S ; Dadashi Serej, A ; Sharif University of Technology
American Society of Civil Engineers (ASCE)
Abstract
Slip along fractures or hydrothermal alternation may lead to formation of weak layers of soils intercalated between the existing rock layers. In this situation, characterization of the behavior of rock fractures requires consideration of a complicated interaction of mechanical properties and geometrical characteristics of the fracture, coupled together with the properties of infill materials. Of the most important parameters which may considerably affect the behavior of an infilled fractured rock are the hydraulic properties of the infill material. These properties reflect the water retention ability of the infill material and determine the meniscus arrangements between the particles. This...
Characterizing the effect of fines content on the small strain shear modulus of sand-silt mixtures during hydraulic hysteresis
, Article 4th International Conference on Transportation Geotechnics, ICTG 2021, 23 May 2021 through 26 May 2021 ; Volume 165 , 2022 , Pages 837-849 ; 23662557 (ISSN); 9783030772338 (ISBN) ; Mohsen Haeri, S ; Khosravi, A ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
Small strain shear modulus, Gmax, is one of the most important parameters for the characterization of the behavior of earth structures subjected to static or dynamic loading conditions. This research presents an experimental laboratory study on the effect of non-plastic fines content and hydraulic hysteresis on the Gmax of unsaturated sandy soils. In this regard, clean Firoozkuh No. 161 silica sand which is classified as poorly graded sand was mixed with different percentages of non-plastic Firoozkuh silt. A set of bender element tests were carried out using two modified triaxial devices. The modifications on these two apparatus were to add HAV ceramic discs for air–water control of...