open access

https://hdl.handle.net/2115/56180

Effect of Temperature and Confining Pressure on Permeability during Deformation and Failure of Shikotsu Welded Tuff

英語

Welded tuff

2012-10-15

Korean Society for Rock Mechanics

Proceedings of the 7th Asian Rock Mechanics Symposium

7

563-572

ARMS7: 7th Asian Rock Mechanics Symposium. The theme of the Symposium is The Present and Future of Rock Engineering. 15-19 October 2012. COEX, Seoul, Korea.

Permeability variation during deformation and failure in triaxial test was considered for Shikotsu welded tuff. Pure water saturated cylindrical test specimens of 30 mm in diameter and length of 60 mm with constant flow rate method at 0.3 ml/min was introduced for compression, with strain rate of 10-5 s-1 on the consolidated samples under 1 MPa, 5 MPa, 10 MPa and 15 MPa for 24 hours until the axial strain reached at 10% in 22ºC and 80ºC. Permeability at the end of 15 MPa consolidation was lower than those of under 1-10 MPa. In compression (i) permeability basically decreased with slight disturbances around peak load points due to rapid volumetric change (ii) under 1 MPa the permeability was larger, compare to 5-15 MPa confining pressure at 22ºC (iii) no apparent confining pressure dependency was observed at 80ºC. The permeability was lower at 80ºC than 22ºC. However, more water flow is expected for the same pore pressure gradient at 80ºC due to lower viscosity of water.

会議発表論文

Accepted Manuscript