Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental Study of Strain Dependent Shear Modulus of Ottawa Sand
Strain dependent shear modulus of soil plays an important role in the assessment of the response of geotechnical structures to dynamic loads. A variety of dynamic and quasi-static (cyclic) laboratory tests can be used to determine shear modulus of soil, each working over different ranges of shear strains. This paper presents results from an experimental study on strain dependent shear modulus of Ottawa sand using two of the most widely applied laboratory tests: resonant column (dynamic) and strain controlled cyclic triaxial (quasi-static) both designed to work over a wide range of shear strains. The results from the two test types yielded shear modulus over a wide range of strains (from 10-4 % up to 6×10−1 %) with overlapping strain levels that allowed direct comparison of the two test types. Tests were conducted on specimens of similar dimensions, relative densities, and confining stresses. Resonant column tests were conducted on both dry and saturated specimens (but with drainage lines open): whereas, Cyclic triaxial tests were conducted only on saturated specimens under undrained condition. All three test types gave similar shear modulus values for shear strains up to 10−2 % and values that compare well with those computed from widely used empirical relationships. In saturated undrained tests at shear strains greater than 10−2 %, the shear modulus became lower than that measured on the dry and drained tests as the pore pressures increased.
Experimental Study of Strain Dependent Shear Modulus of Ottawa Sand
Strain dependent shear modulus of soil plays an important role in the assessment of the response of geotechnical structures to dynamic loads. A variety of dynamic and quasi-static (cyclic) laboratory tests can be used to determine shear modulus of soil, each working over different ranges of shear strains. This paper presents results from an experimental study on strain dependent shear modulus of Ottawa sand using two of the most widely applied laboratory tests: resonant column (dynamic) and strain controlled cyclic triaxial (quasi-static) both designed to work over a wide range of shear strains. The results from the two test types yielded shear modulus over a wide range of strains (from 10-4 % up to 6×10−1 %) with overlapping strain levels that allowed direct comparison of the two test types. Tests were conducted on specimens of similar dimensions, relative densities, and confining stresses. Resonant column tests were conducted on both dry and saturated specimens (but with drainage lines open): whereas, Cyclic triaxial tests were conducted only on saturated specimens under undrained condition. All three test types gave similar shear modulus values for shear strains up to 10−2 % and values that compare well with those computed from widely used empirical relationships. In saturated undrained tests at shear strains greater than 10−2 %, the shear modulus became lower than that measured on the dry and drained tests as the pore pressures increased.
Experimental Study of Strain Dependent Shear Modulus of Ottawa Sand
Zehtab, Kaveh H. (Autor:in) / Gokyer, Seda (Autor:in) / Apostolov, Artur (Autor:in) / Marr, W. Allen (Autor:in) / Werden, Salim K. (Autor:in)
Geotechnical Earthquake Engineering and Soil Dynamics V ; 2018 ; Austin, Texas
07.06.2018
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Experimental Study of Strain Dependent Shear Modulus of Ottawa Sand
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