Permeability Test and Hydraulic Conductivity of Improved Soils by Deep Mixing Method

In this study, Hydraulic conductivity tests using a flexible wall permeameter were conducted using the improved soils by deep mixing method. The effects of whether measures are taken or not to prevent leakage through sidewalls on the results of permeability tests, and the condition that satisfied the condition of hydraulic conductivity k not exceeding 1.0 × 10 -9 m/s were investigated. As a result, it was verified that 1) taking measures to prevent the leakage through sidewalls is essential when conducting a flexible wall permeability test using the improved soils by deep mixing method and that 2) a correlation was recognized between the hydraulic conductivity k and unconfined compression strength q u of the improved soils by deep mixing method and k never exceeds 1.0 × 10 -9 m/s if q u is 2.0MN/m 2 or higher.