石炭の飽和度と液状化の関係に関する基礎的研究

概要

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Strength of liquefaction of sands increases when the degree of saturation decreases. From this point of view, Sweden proposed the Proctor/Fagerberg method to IMO as an alternative test method of the Transportable Moisture Limit. This method introduced 70% degree of saturation as the criterion for the safe transportation of cargoes in bulk. But the applicability of this criteria for coals was not clear because the volumetric change is considerably large due to fragility of edge of the particle. To examine the effect of the degree of saturation on the liquefaction strength, triaxial compression tests for coal were carried out. Even when the degree of saturation is 50%, the coal is liable to liquefy by applying a cyclic load of stress ratio SR=0.3. It can be said that the pore pressure is easy to rise under the unsaturated condition. On the basis of these experimental data, it is concluded that Proctor/Fagerberg method should not be applied for coals.
社団法人日本航海学会の論文
1989-03-20