Influence of mica content on dynamic shear modulus of sandy soils
The Gediz River Delta soils contain abundant flatty (platy) mica grains. Mica grains can alter static and dynamic engineering characteristics of sandy soils due to their flatty shapes. In this study, influence of mica grains on dynamic shear modulus of sandy soils in Gediz River Delta was investigat...
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Published in | The online journal of science and technology Vol. 7; no. 4; pp. 105 - 110 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Sakarya Üniversitesi Yayınları
01.10.2017
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Subjects | |
Online Access | Get full text |
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Summary: | The Gediz River Delta soils contain abundant flatty (platy) mica grains. Mica grains can
alter static and dynamic engineering characteristics of sandy soils due to their flatty shapes. In this
study, influence of mica grains on dynamic shear modulus of sandy soils in Gediz River Delta was
investigated. Maximum shear modulus (Gmax), which is a major parameter in dynamic soil response
analyses, can be obtained at small deformation amplitudes. Therefore, it is determined through
measurement of shear wave velocity. Shear wave velocity provide valuable information about
dynamic characteristics of soils. So it is very important to determine the shear wave velocity with
high accuracy for dynamic soil response analysis. In this respect, firstly engineering boreholes were
drilled and sandy soil samples were recovered along the borehole depth. The mica content of the
samples was determined by means of X-RD analysis method. Then test sample contain 1.5%, 10%
20% mica grains were prepared to represent the Gediz River soils. Shear wave velocity of the sand
samples were determined with bender element tests under 100 kPa cell pressures in triaxial test
device. Followed by the bender element tests maximum shear modules were determined. End of
the test program, shear wave velocity of the dense (Dr:55%) samples were determined as 249 m/sn,
214 m/sn and 187 m/sn for 1.5%, 10% and 20% mica content respectively. Mica was reduced the
shear wave velocity in considerable percentage about 25% rate. Smiler effect was observed on the
maximum shear modules and it is determined as 111.6 MPa, 82.4 MPa, and 62.9 MPa for 1.5%,
10%, 20% mica contents respectively for dense samples (Dr:55%). 20% mica content was reduced
the shear wave velocity about 44% rate. |
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ISSN: | 2146-7390 2146-7390 |