Mechanical and Physical Characterization of Tabriz Marls, Iran |
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Authors: | Ali Hooshmand Mohammad H Aminfar Ebrahim Asghari Hamid Ahmadi |
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Institution: | (1) Department of Geology, University of Tehran, Tehran, Iran;(2) Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran;(3) Department of Geology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran |
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Abstract: | Three types of marls can be found in the Tabriz area (Iran): yellow, green, and gray/black marls. In the present paper, strength
and deformation characteristics of Tabriz marls and their stress–strain behavior are investigated by various in situ and laboratory
tests. In order to study the deformation behavior of these marls, various experiments such as the pressuremeter test, plate
loading test (PLT), seismic wave velocity test, uniaxial compression test, standard penetration test (SPT), and direct shear
test were carried out. Ranges of strain at the elastic and failure points were determined. Young’s and shear modulus were
obtained. Test results showed that the strength characteristics increase with depth. The value of deformation modulus determined
by the pressuremeter test was in good agreement with those obtained from the PLT. This implies that pressuremeter is a suitable
in situ test for characterizing the deformation modulus of marl. Deformation modulus obtained from pressuremeter and plate
loading tests were approximately 4–5 times the results of uniaxial compressive test and the deformation modulus obtained from
seismic data was about 30–50 times the static deformation modulus. Stress–strain curves showed that the maximum value of strain
at the elastic and failure points and the minimum value of strength and deformation modulus are corresponding to the yellow
marls while the minimum value of strain and the maximum value of strength and deformation modulus are corresponding to the
gray/black marls. Some empirical relationships between different characteristics of Tabriz marls were also derived. |
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