THE ESTIMATION OF BEARING CAPACITY AND SWELL POTENTIAL OF DEEP SOIL MIXING ON EXPANSIVE SOIL BY SMALL SCALE MODEL TEST

Abstract

Deep Soil Mixing (DSM) is a ground modification technique to improve soil characteristic.
This paper explain the result of laboratory experiment of deep soil mixing (DSM) in small scale. The model
have been constructed to estimate field condition. The important properties of expansive soil such as the
strength and swelling were investigated. The fly ash was used as binder material to enhance strength and
mitigate swell potential. However optimum binder dosage, water – binder ratio and geometrical column (length,
diameter and spacing) influenced performance of DSM. Variation of length and spacing of column could be
established by considering active zone and the area ratio in the single square arrangement. The required
treatment area are determined based on tolerable swelling and allowable bearing capacity. The small scale of
DSM construction showed significant improvement of swell and strength properties compare with untreated
soil. The empirical model are presented in this research provided reasonable predictions of strength and
swelling for in situ condition.