EFFECT OF INITIAL PRINCIPAL STRESS ROTATION ON THE ANISOTROPIC BEHAVIOR OF SAND IN THE DRAINED CONDITION
In this study, the effect of initial principal stress rotation on anisotropic behavior of medium dense Firoozkuh sand in the drained condition was studied. Hollow Cylindrical Ap...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | fas |
| Published: |
Sharif University of Technology
2020-11-01
|
| Series: | مهندسی عمران شریف |
| Subjects: | |
| Online Access: | https://sjce.journals.sharif.edu/article_21634_f36d6094405433fc50684469e984b47d.pdf |
| _version_ | 1827862062387167232 |
|---|---|
| author | H. Mohamadzadeh H.R. Razeghi M.J. Saffarian |
| author_facet | H. Mohamadzadeh H.R. Razeghi M.J. Saffarian |
| author_sort | H. Mohamadzadeh |
| collection | DOAJ |
| description | In this study, the effect of initial principal stress rotation on anisotropic behavior of medium dense Firoozkuh sand in the drained condition was studied. Hollow Cylindrical Apparatus (HCA) was used to conduct the tests in the drained
condition on the medium dense specimens of Firoozkuh sand. All specimens were
prepared with a height of 200 mm and outer and inner diameters of 100 and 60
mm, respectively, using dry air pluviation method. The specimens were
consolidated subjected to the anisotropic initial stresses with different directions $(\alpha_c)$.During consolidation, stress ratio $(R_c=\sigma_{1c}'/ sigma_{3c}'=2)$
was maintained equal to 2. Specimens were consolidated under an anisotropic
condition in which the rotation of initial principal stresses was set to a constant value varying from zero to $45^{0}$. The specimens were sheared under different inclinations of principal stress increments $(\alpha_{\delta\sigma})$ varying from zero to $45^{0}$. In these tests, the direction of principal stress increments
$(\alpha_{\delta\sigma})$ may be not equal to the direction of the principal stress due to anisotropic stresses, applied in the consolidation phase. Generally, the results showed a decrease in the shear strength of sand by increasing $(\alpha_{\delta\sigma})$. The results showed that the stress-strain behavior and shear strength of medium dense sand were influenced by the inclination of initial principal stresses. Initial anisotropic principal stresses caused initial shear strains which softened the stress-strain behavior of sand. Therefore, the shear modulus and shear strength for anisotropic consolidated specimens were less than that of the isotropic consolidated specimens. The anisotropic response of medium dense
sands was observed to be governed by $(\alpha_c)$. It was found that the shear modulus and shear strength of sand relatively decreased and anisotropy coefficient significantly increased when anisotropic initial stress and increments of principal stresses were in the same direction. The effect of initial stress state on the shear modulus was more noticeable than that on the shear strength of sand. |
| first_indexed | 2024-03-12T13:48:07Z |
| format | Article |
| id | doaj.art-7aaa30a1db8144c787e2c3bc4586bf2f |
| institution | Directory Open Access Journal |
| issn | 2676-4768 2676-4776 |
| language | fas |
| last_indexed | 2024-03-12T13:48:07Z |
| publishDate | 2020-11-01 |
| publisher | Sharif University of Technology |
| record_format | Article |
| series | مهندسی عمران شریف |
| spelling | doaj.art-7aaa30a1db8144c787e2c3bc4586bf2f2023-08-23T07:52:03ZfasSharif University of Technologyمهندسی عمران شریف2676-47682676-47762020-11-0136.23.2879610.24200/j30.2019.53345.254121634EFFECT OF INITIAL PRINCIPAL STRESS ROTATION ON THE ANISOTROPIC BEHAVIOR OF SAND IN THE DRAINED CONDITIONH. Mohamadzadeh0H.R. Razeghi1M.J. Saffarian2Dept. of Civil Engineering Buein Zahra Technical UniversityDept. of Civil Engineering Iran University of Science and TechnologyDept. of Civil Engineering Buein Zahra Technical UniversityIn this study, the effect of initial principal stress rotation on anisotropic behavior of medium dense Firoozkuh sand in the drained condition was studied. Hollow Cylindrical Apparatus (HCA) was used to conduct the tests in the drained condition on the medium dense specimens of Firoozkuh sand. All specimens were prepared with a height of 200 mm and outer and inner diameters of 100 and 60 mm, respectively, using dry air pluviation method. The specimens were consolidated subjected to the anisotropic initial stresses with different directions $(\alpha_c)$.During consolidation, stress ratio $(R_c=\sigma_{1c}'/ sigma_{3c}'=2)$ was maintained equal to 2. Specimens were consolidated under an anisotropic condition in which the rotation of initial principal stresses was set to a constant value varying from zero to $45^{0}$. The specimens were sheared under different inclinations of principal stress increments $(\alpha_{\delta\sigma})$ varying from zero to $45^{0}$. In these tests, the direction of principal stress increments $(\alpha_{\delta\sigma})$ may be not equal to the direction of the principal stress due to anisotropic stresses, applied in the consolidation phase. Generally, the results showed a decrease in the shear strength of sand by increasing $(\alpha_{\delta\sigma})$. The results showed that the stress-strain behavior and shear strength of medium dense sand were influenced by the inclination of initial principal stresses. Initial anisotropic principal stresses caused initial shear strains which softened the stress-strain behavior of sand. Therefore, the shear modulus and shear strength for anisotropic consolidated specimens were less than that of the isotropic consolidated specimens. The anisotropic response of medium dense sands was observed to be governed by $(\alpha_c)$. It was found that the shear modulus and shear strength of sand relatively decreased and anisotropy coefficient significantly increased when anisotropic initial stress and increments of principal stresses were in the same direction. The effect of initial stress state on the shear modulus was more noticeable than that on the shear strength of sand.https://sjce.journals.sharif.edu/article_21634_f36d6094405433fc50684469e984b47d.pdfanisotropic behavior of sandinitial principal stress rotationhollow cylindrical apparatus (hca)firoozkuh sand |
| spellingShingle | H. Mohamadzadeh H.R. Razeghi M.J. Saffarian EFFECT OF INITIAL PRINCIPAL STRESS ROTATION ON THE ANISOTROPIC BEHAVIOR OF SAND IN THE DRAINED CONDITION مهندسی عمران شریف anisotropic behavior of sand initial principal stress rotation hollow cylindrical apparatus (hca) firoozkuh sand |
| title | EFFECT OF INITIAL PRINCIPAL STRESS ROTATION ON THE ANISOTROPIC BEHAVIOR OF SAND IN THE DRAINED CONDITION |
| title_full | EFFECT OF INITIAL PRINCIPAL STRESS ROTATION ON THE ANISOTROPIC BEHAVIOR OF SAND IN THE DRAINED CONDITION |
| title_fullStr | EFFECT OF INITIAL PRINCIPAL STRESS ROTATION ON THE ANISOTROPIC BEHAVIOR OF SAND IN THE DRAINED CONDITION |
| title_full_unstemmed | EFFECT OF INITIAL PRINCIPAL STRESS ROTATION ON THE ANISOTROPIC BEHAVIOR OF SAND IN THE DRAINED CONDITION |
| title_short | EFFECT OF INITIAL PRINCIPAL STRESS ROTATION ON THE ANISOTROPIC BEHAVIOR OF SAND IN THE DRAINED CONDITION |
| title_sort | effect of initial principal stress rotation on the anisotropic behavior of sand in the drained condition |
| topic | anisotropic behavior of sand initial principal stress rotation hollow cylindrical apparatus (hca) firoozkuh sand |
| url | https://sjce.journals.sharif.edu/article_21634_f36d6094405433fc50684469e984b47d.pdf |
| work_keys_str_mv | AT hmohamadzadeh effectofinitialprincipalstressrotationontheanisotropicbehaviorofsandinthedrainedcondition AT hrrazeghi effectofinitialprincipalstressrotationontheanisotropicbehaviorofsandinthedrainedcondition AT mjsaffarian effectofinitialprincipalstressrotationontheanisotropicbehaviorofsandinthedrainedcondition |