A field test on a new chemical grouting method to improve the liquefaction resistance of sandy layers beneath the existing structures

Authors have developed a new chemical grouting method to increase the liquefaction resistance of sandy layers beneath the existing structures. The results of the experiments carried out to date indicate that this approach could prove extremely effective. On the basis of the laboratory tests, a field test was performed on the beach of Niigata city to investigate the permeability and the strength increment by improvement. The diameter of each improved area became about 4m long by 8-hours injection. This paper describes the results of the grouting tests at the site, together with the dynamic characteristics of the improved soils sampled after the grouting. The method was found to be very useful to improve the liquefaction resistance beneath the existing structures.