| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
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| Research Abstract |
A series of wave loading test with different conditions of bottom mud and waves were carried out and the relationship among the cracks made atthe surface by loading, the property changes of mud after loading and the rheology characteristics of mud were investigated. An analysis method to predict the stability of bottom bud (the occurrence of crack) subjected wave loading was proposed. The result of the analyses showed that the water content at the surface of seabed should be 1.5-2.0 times the liquid limit, which agreed well with the observed water contents at actual seabed. It is found that the safety factor calculated by the analyses using a yield stress obtained by cyclic viscometer can be considered as undrained strength showed the actual behavior of muds observed in the wave loading tests fairly well. The yield stress of mud has a close relationship with the liquid limit and a vane shear strength of the mud.
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