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|Title:||Proposal of a new multiple-step loading triaxial compression testing method|
|Citation:||Proceedings of the 5th Asian Rock Mechanics Symposium, 2008 / Majdi, A., Ghazvinian, A. (ed./s), pp.517-524|
|Publisher:||International Society for Rock Mechanics|
|Conference Name:||5th Asian Rock Mechanics Symposium (ARMS5) (24 Nov 2008 - 26 Nov 2008 : Tehran, Iran)|
|A. Taheri, K.Tani|
|Abstract:||Multiple-step Loading Triaxial Compression Test (ML-TCT), allows evaluating shear strength parameters, i.e. cohesion and friction angle from a single specimen. The test consists of a series of consolidation and shearing steps, and in each step the axial loading is stopped or reversed before a complete failure. The ISRM suggested method have suggested to increase axial load until the axial stress-strain curve show a horizontal tangent ( Etan = 0). However, due to large plastic deformations in the specimen immediately before arriving to this critical point, the shear strengths obtained by this method are prone to be underestimated comparing with those for intact specimens. In this study, a new multiple-step loading method is proposed for the determination of the triaxial compression strength envelope. Series of Single-step Loading Triaxial Compression Tests (SL-TCTs), and ML-TCTs in increasing and decreasing confining pressure steps were carried out using a sedimentary soft rock, mudstone. Careful examination of the axial stress-strain relationship lead to the conclusion that, the point at which the secant Young’s modulus became the maximum value ( Esec = max) appeared to be a suitable criterion for estimating the imminent failure of the rock specimen. The failure envelopes derived using this method closely approximated that derived from SL-TCTs on intact specimens. Whereas, the shear strengths determined based on the ISRM suggested method were not in good agreement with those for intact specimens.|
|Keywords:||Multiple-step loading; Triaxial compression test; Young’s modulus; Shear strength; Mudstone.|
|Description:||Conference theme: New Horizons in Rock Mechanics - Developments and Applications"|
|Rights:||Copyright 2008. International Society for Rock Mechanics (ISRM) and Iranian Society for Rock Mechanics (IRSRM)|
|Appears in Collections:||Civil and Environmental Engineering publications|
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