Zen K.,Kyushu University |
Hirasawa M.,Kyushu University |
Shinsaka T.,Compaction Grouting Society of Japan |
Adachi M.,Compaction Grouting Society of Japan
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2015
The compaction grouting method (called the CPG hereafter) is classified into the densification/compaction method in its soil stabilization principle. In the CPG, taking the balance between strength increment and upheaval of ground is very significant, since the surrounding ground is densified by injecting a stiff soil cement mortal with low slump value under comparatively high pressure. Therefore, the increment of N-value after improvement and the upheaval of ground during grouting are highlighted in this paper. Resent case histories at airports, ports and historical buildings are introduced as one of the countermeasures against liquefaction applicable to the liquefiable ground beneath the existing structures. Copyright © 2015 by the International Society of Offshore and Polar Engineers (ISOPE).
Nakazawa H.,Port and Airport Research Institute |
Sugano T.,Port and Airport Research Institute |
Adachi M.,Compaction Grouting Society of Japan |
Yamada K.,Compaction Grouting Society of Japan |
And 3 more authors.
Zairyo/Journal of the Society of Materials Science, Japan | Year: 2010
The role of an airport during and after a great earthquake is important because of its helpful function for emergency medical services and special activities of the transport of relief supplies to the disaster areas. In this study, the authors conducted a full-scale field experiment on liquefaction phenomena induced artificially by controlled-blast technique in the experimental site at the Ishikari Bay New Port in Hokkaido Island, in order to investigate the influence of a great earthquake on the airport's function in Japan. This experiment especially focused on the assessment of the performance of runway pavement and the effect of densification method as countermeasure for liquefaction with a cost-reduction design. This study concludes that densification method examined with cost-reduction design in this experiment keeps its effectiveness based on results of measurements of liquefaction behavior of liquefied layer and runway pavement, ground investigations after liquefaction and liquefaction-induced residual deformation analysis. © 2010 The Society of Materials Science.