Although the maintenance work of pavement is often planned based on MCI and FWD data, the repeated damages of pavement are observed at many places. This surface damage of pavement is partly originated by the weakness of subgrade, damage of the filled up ground and ground water. In order to avoid repeated maintenance works of pavement, the condition of earthfill structure should be evaluated by an easy logging technique from pavement surface. The automatic technology for surveys and evaluations of pavement and embankment by using surface wave logging and electric resistivity logging has been proposed. In this study, we tried to improve the pavement life by reinforcing the base course using geosynthetics for degraded pavement on the low embankment with multiple box culverts.

The chemical grouting methods have been widely used as liquefaction mitigation methods. However, the injection loss due to the leak of chemical liquid from the drilling hole and the injection inhibition due to the borehole wall failure have been often observed. In this study, we developed a new chemical grouting method to overcome these problems. A developed chemical grouting method has two unique technical features. One is the packer which is made up of cloth and rubber. The other is a special sealing material which protects the borehole wall during drilling and is fluidized during the chemical injection. From the trial in-situ injection tests results, it was found that 1) the leak of chemical liquid from the drilling hole has not been observed, and 2) a wide range of chemical grouting has been achieved by about 30% of the injection pressure compared to the conventional Double-Pipe Double-Packer method.

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