Publication Abstract

Proceedings of the Deep Mixing 2015 Conference, (DFI)

Case Histories of Arch Action Low Improvement Ratio Cement Column Method (ALiCC Method)
Masuo Kondoh, Public Works Research Institute, Japan; Hiroaki Miyatake, Public Works Research Institute, Japan; Jun Ohbayashi, Fudo Tetra Co. Ltd., Japan; Naotoshi Shinkawa, Fudo Tetra Co. Ltd., Japan; Yoshiyuki Yagiura, Kiso-Jiban Consultants Co. Ltd., Japan

Reducing the improvement ratio of ground improvement is an extremely efficient way to reduce the construction cost and construction period of mitigation measures for soft ground. The Arch Action Low Improvement Ratio Cement Column (ALiCC Method) is one method for this, and it is being increasingly applied to sites. This method enables us to rationally evaluate the embankment loads that are acting on cement improved soil columns and unimproved ground, by considering the arch action generated in the embankments and from there thusly allocate improved soil columns in spans of a greater distance than those needed for conventional methods. As a result, it serves to reduce construction costs and the construction period, while also minimizing the settling of the embankment and differential settlement, by placing numerous improved soil columns in the ground immediately beneath the embankment at equidistant intervals. In this report, we give a basic overview of the ALiCC Method, report typical construction results from real life cases that have been carried out, and make comparisons with other construction methods in order to report on the effectiveness of this design method.

 article #2122; publication #1013 (DM-2015)