Abstract:

When the soil sample which has the feature of poorer permeability is used to do consolidated drained triaxial tests, its processes of saturation, consolidation and shearing will take a long time. A new drilling and sand replacement method of consolidated drained triaxial tests which is done by drilling and replacing sand in soil samples is put forward to improve the test efficiency; and the verification of this test has been done. As the experiment result of the scheme indicated, the sand drain, the replacement ratio of which are between 1 % and 3 %, has small effect on the stress and strain of consolidated drained triaxial tests, at the same time is beneficial to accelerate the soil sample‘s process of saturation, consolidation and drainage, pore pressure dissipation, shearing and drainage, and so on. The test efficiency is 5 times higher than that of before. The filter papers are pasted from top to bottom of the soil sample and the boreholes inside it are filled with many sands. Combining the above two practices, this method is a scientifically rational, effective and good method which has attained accurate and reliable parameters of the E-B model.

Key words: drilling and sand replacement method, replacement ratio, consolidated drainage, consolidated drained triaxial tests, E-B model