Evaluation of chemical grouted soil by electrical resistivity

Abstract

Chemical grouting is frequently used as a groundimprovement method for the construction of underground structures. However, it is difficult to evaluate the qualities of region solidified by chemical grouting. To solve this problem, we note that the electrical resistivity of chemical grout is much lower than that of the ground or ground water. We measured the electrical resistivity of some saturated sands and grouted sands in the laboratory, in order to investigate the electrical resistivity of the grounds before and after chemical grouting. On the basis of the results obtained, we propose a model of the electrical resistivity of ground before and after chemical grouting, and evaluate the grout void ratio, which is the volume ratio of grout occupying the void space of the improved ground. The validity of this evaluation is demonstrated by a comparison of the calculated and laboratory test results.