open access

https://hdl.handle.net/2115/58548

Biot’s Effective Stress Coefficient of Rocks for Peak and Residual Strengths by Modified Failure Envelope Method

英語

2014-05

CRC Press

155-160

2014 ISRM European Rock Mechanics Symposium (EUROCK 2014), May 27-29, 2014, Vigo, Spain.

Kimachi sandstone and Shikotsu welded tuff were tested in single and multistage triaxial tests to determine the Biot’s effective stress coefficient (α). Pure water saturated 30mm in diameter and length of 60mm cylindrical test specimens were introduced for triaxial compression, with strain rate at 10−5 s−1. For Kimachi sandstone, α value for peak strength decreased with effective confining pressure. α values for residual strength were almost constant and larger than the case of peak strength. For Shikotsu welded tuff, only two data points were obtained for peak strength due to pore collapse and α value for residual strength decreased with effective confining pressure. The multistage test has given a fair evaluation of the coefficient for peak strength of Kimachi snadstone. Number of specimens and variation from specimen to specimen can be reduced by using multistage tests although further considerations are required to obtain the coefficient for residual strength.

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Accepted Manuscript