4.2　Liquefaction Potential Tests by Poland

Poland also carried out the Liquefaction Potential Tests in accordance with the test procedure described in DSC 3/INF.6. The sizes of the specimens and number of droppings of compaction hammer for the tests in Poland and Japan are given in table 9.

　

Table 9　Size of specimen and number of droppings of compaction hammer

　

It should be noted that the conditions of drainage in the tests by Poland and Japan were different, because the sizes of the specimen were different. Furthermore, though the compactive effort, i.e., the energy of compaction per unit volume, was the same, the compaction conditions of the tests by Poland and Japan were different, strictly speaking.

The results of the tests are given in Table 10.

　

Table 10　Results of Liquefaction Potential Test by Poland

　

4.3　Discussion

It is supposed that the significant difference between the degrees of saturation after drainage for Galena by Poland and Japan is caused by the differences in condition on drainage and condition on compaction due to the difference in size of specimen. The repeatability of Liquefaction Potential Test has not been confirmed in the work of the Correspondence Group. Regarding the materials which may liquefy, i.e., Iron Conc., Copper Conc. and Zinc Conc., the drainage from each sample was little. The amount of drainage from Galena by Japan was also little. As described in the next paragraph, there is no significant difference between Galena, which is empirically judged as not liable to liquefy, and Iron Conc. in regard to permeability. Furthermore, it was possible to determine the Transportable Moisture Limit for Galena. In view of these, the liquefaction potential of Galena should be deliberated.

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