Quality identification of chemical grouting improvement by electrical logging

The chemical grouting improvement is one of the typical countermeasures against liquefaction during an earthquake. The quality of the improved ground is usually identified by the uniaxial compressive strength. However, the sample disturbance is likely to occur during sampling because the target strength of the improvement body is relatively low. Therefore, it is very difficult to grasp a characteristic change before and after the improvement. In this study, we focused on the change in electric resistivity in addition to the uniaxial compressive strength as a quality identification. The effectiveness of quality identification using electric resistivity was confirmed by metal barrel model experiments and a field test.