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Paper Information

Journal:   JOURNAL OF ENGINEERING GEOLOGY   FALL 2017 , Volume 11 , Number 3 ; Page(s) 81 To 102.
 
Paper: 

DEFORMATION AND STRENGTH ANISOTROPY OF CALCAREOUS SLATES UNDER BRAZILIAN TESTS

 
 
Author(s):  GHOBADI MOHAMMAD HOSEIN*, BEHZADTABAR PARIA
 
* DEPARTMENT OF GEOLOGY, BU-ALI SINA UNIVERSITY
 
Abstract: 

Rock anisotropy plays an important role in engineering behavior of rocks. Slates are anisotropic rocks which have long been used for gable roof, floor tiles, borrow materials, and other purposes. The slates studied in this research are calcareous and have a porphyro-lepidoblastic texture. To determine the role of the anisotropy on the tensile strength and fracture pattern, two variables including Y (the core axis angle to foliation) and b(the angle between the axis of loading and foliation) in the Brazilian tests were used. The angles were selected at 15o intervals.
Thus, for both
Y and b, seven angles of 0o, 15o, 30o, 45o, 60o, 75o, and 90o were selected (i.e., there are 43 possible modes). In order to name and examine the failure pattern, 11 models were proposed. The average value of the failure strength for the three stations varies from 3.21 MPa to 20.94 MPa. Based on the obtained results, there is a direct relation between the average tensile strength and density. A comparison between Brazilian test data under dry and saturation conditions shows that the saturated Brazilian tensile strength is 30.8% less than the dry Brazilian tensile strength. Moreover, the changes in fracture length with thechanges in? and b indicate an inverse relation. Eventually, the average of tensile strength(st) and strength anisotropy index (Ia) demonstrates thatthe influence of orientation angle (Y) is much larger than that of foliation-loading angle (b).

 
Keyword(s): ANISOTROPY, SLATE, BRAZILIAN TEST, FRACTURE PATTERN, TENSILE STRENGTH
 
 
References: 
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Citations: 
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+ Click to Cite.
APA: Copy

GHOBADI, M., & BEHZADTABAR, P. (2017). DEFORMATION AND STRENGTH ANISOTROPY OF CALCAREOUS SLATES UNDER BRAZILIAN TESTS. JOURNAL OF ENGINEERING GEOLOGY, 11(3 ), 81-102. https://www.sid.ir/en/journal/ViewPaper.aspx?id=568441



Vancouver: Copy

GHOBADI MOHAMMAD HOSEIN, BEHZADTABAR PARIA. DEFORMATION AND STRENGTH ANISOTROPY OF CALCAREOUS SLATES UNDER BRAZILIAN TESTS. JOURNAL OF ENGINEERING GEOLOGY. 2017 [cited 2021July26];11(3 ):81-102. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=568441



IEEE: Copy

GHOBADI, M., BEHZADTABAR, P., 2017. DEFORMATION AND STRENGTH ANISOTROPY OF CALCAREOUS SLATES UNDER BRAZILIAN TESTS. JOURNAL OF ENGINEERING GEOLOGY, [online] 11(3 ), pp.81-102. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=568441.



 
 
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