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| | Abstract | | It is desirable to verify a chemical grout injection area for earthquake liquefaction countermeasure by chemical grout injection method. We have carried out two tests, a cylindrical specimen test and a laboratory soil model test, for the purpose of improving a verification method for chemical grout injection area by P-wave attenuation tomography. The cylindrical specimen test results showed that P-wave attenuation started increasing about 300 minutes after chemical grout was injected into the specimen and increased in proportion to silica concentration. On the other hand, P-wave velocity did not change clearly. The laboratory soil model test results showed that P-wave attenuation increased at the injection area but decreases in partially unsaturated area. In conclusion, it is believed that P-wave attenuation tomography can be useful to verify a chemical grout injection area in saturated ground. |
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