IN-SITU TEST ON DESATURATION BY AIR INJECTION AND ITS MONITORING

Abstract

  Desaturation of ground by air injection attracts considerable attention in resent years as an innovative technique for liquefaction countermeasure. This technical report describes an in-situ air injection test which aims to confirm an effectiveness of the air injection to desaturate ground and validity of observation techniques to monitor the evaluation of unsaturated area. In the test, air was injected from an air injector set at a depth of 6m. Air flow rate increased linearly with increasing air injection pressure and desaturated area was formed within 4m from the injector. 3D resisitevity tomography and FDR probes were found to be effective to detect evolution of the desaturated area.