We measured permeability of the samples using "constant head method". The samples were compacted at dry condition under the same compaction procedure as that for Proctor/Fagerberg Test. Darcy coefficient of each sample is given in Table 4. Detail of the test procedure and the results are given in the report of the Correspondence Group ⁽¹⁰⁾.

Darcy coefficients of Iron Conc. and Galena are in the same order. Darcy coefficient of Nickel Slag is significantly large compared with others.

　

Table 4　Permeability of samples

　

5.7　Liquefaction potential test

The results of the liquefaction potential tests are given in Table 5. Degree of saturation after drainage of Nickel Slag is considerably low compared with those of other materials. This corresponds to the general understanding that Nickel Slag is not liable to liquefy. The drainage of other four materials is not significant.

　

Table 5　Results of liquefaction potential tests

　

5.8　Discussion

Since the FMP of Galena was measured by the Penetration Test, it can be said that Galena has high liquefaction potential. So that, it is appropriate to apply the requirement for cargoes which may liquefy to Galena.

The results of the liquefaction potential tests shows that the samples were clearly categorized into two groups based on the degree of saturation after drainage.

Regarding the criterion for judgment, it should be noted that degree of saturation after drainage depends on conditions of drainage and compaction conditions. Table 6 shows the maximum degree of saturation in Proctor/Fagerberg Test (c.f., Table 2) and degree of saturation after drainage in the liquefaction potential test (c.f., Table 5).

　

Table 6　Degree of saturation in L.P.T. and Proctor/Fagerber Test

　

The liquefaction potential test provides high degree of saturation after drainage. The degree of saturation after drainage of materials which may liquefy were higher than the proposed criterion 70 %. Consequently, it is concluded that the new test procedure effective for judging the liquefaction potential of solid bulk materials.

　

6　Conclusion

We developed a new test procedure, named Liquefaction Potential Test, for the judgment on the application of the requirement for materials which may liquefy.

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