Full-scale reinforced embankment on deep jet mixing improved ground

A 6 m high reinforced embankment constructed on deep-mixing improved soft Bangkok clay is presented. The jet mixing method with cement slurry employing a jet pressure of 20 MPa was utilised in the installation of deep mixing piles. Surface settlements and lateral movements were monitored during and after construction. The deep mixing improvement has effectively reduced the settlement by as much as 70%. The differential settlement between pile and soil ranged from 8 to 20% of the average settlement. Moreover, the back analysis confirmed the laboratory investigation that the soil–cement pile installed by jet mixing can have a higher after-curing void ratio and, consequently, higher permeability and coefficient of consolidation. Finally, the higher permeability ratios, Kv,p/Kv,c, of 30 and 40 were confirmed from numerical and analytical back analyses, respectively. Une berge renforcee de 6 m de hauteur, construite sur une argile tendre de Bangkok amelioree par mixage profond fait l'objet de cette etude. Nous...