On Applicability of Some Indirect Tests for Estimation of Tensile Strength of Anisotropic Rocks
Publish place: Journal of Mining and Environment، Vol: 11، Issue: 3
Publish Year: 1399
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JMAE-11-3_005
تاریخ نمایه سازی: 21 اردیبهشت 1400
Abstract:
The tensile strength of rocks plays a noteworthy role in their failure mechanism, and its determination can be beneficial in optimizing the design of the rock structures. Schistose rocks due to their inherent anisotropy in different foliation directions show a diverse strength at each direction. The purpose of this work was to compare and assess the tensile strength of phyllite, which was obtained in direct and indirect tensile tests in different foliation directions. To this end, several phyllite specimens with different foliation angles (۰º, ۳۰º, ۴۵º, ۶۰º, and ۹۰º) related to the loading axis (β) were prepared. Finally, the direct tensile test, diametrical and axial point load tests, Brazilian test, and Schmidt hammer test were conducted on ۱۸۸ samples. The results of the experimental tests revealed that the maximum and minimum tensile strengths in direct tensile testing tension were directly related to the angles of ۰º and ۹۰º. Also it was observed that the Brazilian tensile strength overestimated the tensile strength. Furthermore, an exponential correlation was introduced between the direct tensile strength and the Brazilian tensile strength.
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Authors
F. Rastegar
Rock Mechanics Division, School of Engineering, Tarbiat Modares University, Tehran, Iran
H. R. Nejati
Rock Mechanics Division, School of Engineering, Tarbiat Modares University, Tehran, Iran
A. Ghazvinian
Rock Mechanics Division, School of Engineering, Tarbiat Modares University, Tehran, Iran
M. R. Hadei
Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran
A. Nazerigivi
Faculty of Civil Engineering, University of Minho, Braga, Portugal
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