The while the top and bottom pressures are maintained during the permeability test, the cell pressure is also maintained constant with an additional flow pump. Therefore, it seems that if the sample pressure decreases while the cell is constant it is experiencing an increase in effective stress...
Thanks, that should be 3 psi (21 kpa).
The top and bottom pressures are being applied with flow pumps. Since the permeability test is performed at the same effective stress as the consolidation, I don't expect to see the sample still consolidating. The sample is structural backfill with...
I'm performing a permeability test, ASTM D5084, using a 150mm dia. sample. After saturation and consolidation, the permeability test is performed using a confining stress equal to the previous consolidation. What I'm don't understand is that during the test (constant flow bottom to top), the...
