Abstract
In chemical grouting, it is difficult to evaluate the improved region. To solve this problem, we proposed the evaluation method of improved region by resistivity tomography. In this study, the applicability of this method was investigated by a series of model tests in the laboratory from the viewpoints of the electrode arrangement and the resistivity contrast between grout and ground water. The test results showed that the evaluation was accurate if the electrodes and solidified region were close to each other. The electrodes must therefore be placed at the adjacent points to the grouting region designed. Furthermore, the test results showed that the improved region was evaluated accurately when the resistivity of the grout was less than one-tenth of the resistivity of the ground water.
