Record number :
691923
Title of article :
Effects of loading rate and initial stress state on stressstrain behavior of rock fill materials under monotonic and cyclic loading conditions
Author/Authors :
Aghaei Araei، A. نويسنده Department of Geotechnical Engineering, Building and Housing Research Center (BHRC), Tehran, P.O. Box 13145-1696, Iran , , Razeghi، H.R. نويسنده School of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, P.O. Box 16765-163, Iran , , Ghalandarzadeh، A. نويسنده , , Hashemi Tabatabaei ، S. نويسنده Department of Geotechnical Engineering, Building and Housing Research Center (BHRC), Tehran, P.O. Box 13145-1696, Iran ,
Issue Information :
دوماهنامه با شماره پیاپی 51 سال 2012
Pages :
16
From page :
1220
To page :
1235
Abstract :
This paper studies loading rate effect on stressstrain behaviors of high compacted rockfill materials. The large scale triaxial-dynamic equipment was used for this propose. To check the equipment capabilities, tests have been carried out on elastic spring and damping rubber specimens. The laboratory tests results indicate that the loading rate effect in elastic metal spring is negligible, while it has considerable effects on stressstrain behaviors in damping rubber, and especially in rockfill materials. The laboratory test results on rockfill materials have shown that dry specimens have higher E and D values compared to the saturated samples. Anisotropic specimens have higher Youngʹs modulus and less damping ratio in comparison to isotropic samples. Generally, the influence of the main parameters on E and D in rockfill specimens is initial vertical effective stress and loading frequency, respectively. The high compacted rockfill specimen exhibits a non-destructive response to the application of cyclic loading below a threshold axial strain level of < 0.005%. Since the frequency effect was observed in the strain levels lower than 0.005%, and there is not meaningful build up of pore pressure in this strain level, therefore any effect of excess pore water pressure on the frequency effect is negligible.
Journal title :
Scientia Iranica(Transactions A: Civil Engineering)
Serial Year :
2012
Link To Document :
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