The ground reinforcement effect of pressure grouting depends on grout penetration into ground. It is not, however easy to estimate the grout penetration in the design process because of the heterogeneity of ground conditions. Research has been performed which focused on the grout penetration distance. This study performed a series of laboratory model tests of pressure grouting on weathered soil to investigate optimum method of grouting. Tests were carried out changing confining pressure and injection pressure, measuring grout volume and the strength of modified ground. From the test results, it was found that optimum injection pressure is around 3.5kg/cm~2.
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