Publication Abstract

Proceedings of the Deep Mixing 2015 Conference, (DFI)

Execution Examples of the Expanded Dry Jet Mixing (EX-DJM) Method
Yosuke Hioki, Toko Geotech Coporation, Japan; Kiyotaka Ohno, Toko Geotech Coporation, Japan; Nobushige Yasuoka, Toko Geotech Coporation, Japan

The diameter of improved columns adopted by the original DJM Method had been 1000 mm, however, in order to comply with the social need for construction cost reduction, the Expanded Dry Jet Mixing (EX-DJM) Method with maximum column diameter expanded to 1300 mm was developed between 1998 and 2001 and has been widely applied since then. From the first application of EX-DJM in January 2002 for a first construction project, the total volume of improved soil has reached 325,000 m3 in 17 projects up to September 2014. Because of the advantages of the EX-DJM such as reduction of construction costs and periods leading to reduction in the number of improved columns, adoption of this method is expected to increase in the future. This paper describes the advantages of the EX-DJM, its construction results and case examples including those applied to restoration projects after the Great East Japan Earthquake, 2011.

 article #2111; publication #1013 (DM-2015)