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Type: Journal article
Title: Characterization of a sedimentary soft rock by a small in-situ triaxial test
Author: Taheri, A.
Tani, K.
Citation: Geotechnical and Geological Engineering: an international journal, 2010; 28(3):241-249
Publisher: Springer Science and Business Media LLC
Issue Date: 2010
ISSN: 0960-3182
Conference Name: First Sri Lankan Geotechnical Society (SLGS) International Conference on Soil and Rock Engineering (07 Aug 2007 - 11 Aug 2007 : Colombo, Sri Lanka)
Statement of
Taheri, A. and Tani, K.
Abstract: To measure the shear strength and deformability of a sedimentary soft rock, a small down-hole in-situ triaxial testing method is developed. The apparatus consists of a triaxial cell and an axial loading device which enables testing at any depth. In this method, a columnar specimen of diameter 90 mm and 285 mm height can be sheared at the bottom of a drill hole. A series of tests were conducted at a 50 m deep experimental cavern. The test gallery is contained in mudstone with some inter-bedded thin sand layers. The tests were done in three different depths in a borehole by a multiple-step loading method. The new testing method was successful to measure stress-strain relation of rock mass. The test results demonstrated that the multiple-step loading method is acceptable in mudstone formation, if an appropriate criterion for load reversal is selected to recognize the instant of failure by stress-strain relation during loading. In addition, different results for mechanical properties of mudstone rock mass were observed in the specimens contained sand layers. It is also concluded that, the same loading method is not successful if a sand layer is located in the middle of the specimen due to large damage induced in early stages of loading. © Springer Science+Business Media B.V. 2008.
Keywords: Rock mass, In-situ test; Triaxial test; Shear strength; Deformation; Mudstone; Multi-step loading
Rights: Copyright status unknown
DOI: 10.1007/s10706-008-9245-9
Appears in Collections:Aurora harvest 7
Civil and Environmental Engineering publications

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