Abstract
This paper describes the compaction effect of static grouting. The static grouting is utilized as a countermeasure against liquefaction of sandy ground, in which columns of low flowability material, sand or gravel is installed into ground. In this study, a series of model tests on the static grouting was carried out in order to clarify mechanism of compaction by static grouting. Grouting pressure is needed to be increased for expansion of column. However, the results of model tests showed that grouting pressure has an upper limit and that columns expanded without increase of grouting pressure after the pressure had reached the upper limit. Furthermore, it was found that the value of the limit pressure depended on the overburden pressure and initial density of ground. These results and the change of stress state by installing columns are expressed by the theory of cavity expansion.
