Abstract

The low initial viscosity of colloidal silica enables the use of low injection rates during soil treatment against liquefaction. Several large scale 3-D laboratory experiments show that colloidal silica treatment provides successful treatment coverage when the distance between injection and extraction wells is about 2.5 m. However the repeatability of such large scale experiments to optimize the injection procedure is cumbersome. Therefore such optimization process is achieved by 3-D flood simulator UTCHEM. This study discusses the required injection and extraction rates and well setups for optimum coverage considering different soil conditions.

Key words: Colloidal silica injection, MODFLOW, chemical grouting, liquefaction, numerical analysis.