doi:10.3850/GI088

ABSTRACT

In Japan, approximately 13 million m³ of dredged soil is produced every year from dredging. Therefore, dredged soil is recycled and used for reclaiming land and filling the backland of bulkheads after enhancing its strength. This paper first outlines the pneumatic flow mixing method. This method involves mixing a stabilizing agent with dredged soil while pumping the grab-dredged soil via a pneumatic barge by using the turbulence generated by plug flows within the pneumatic pipe. Then it describes the pipe mixing method, which is a modification of the pneumatic flow mixing method developed for treating soil so as to have improved mixing performances. Finally an actual application of the pipe mixing method is described, including methods of execution and quality control and the strength of the resultant treated soil. The principal contents were as follows: (i) The pneumatic flow mixing method is appropriate for rapid and mass soil treatment. (ii) The solidification of the dredged soil was designed and executed according to the Technical Manual for the Pneumatic Flow Mixing Method in Japan. It was effective for producing a sufficient amount of treated soil that satisfied the required quality (strength).

Keywords: Pneumatic flow mixing method; stabilization; dredged soil.

© 2010 by Geotechnical Society of Singapore (GeoSS)