| Deep Penetration of Spudcan Foundation into Double Layered Soils |
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| 作者姓名： | 刘君 胡玉霞 孔宪京 |
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| 作者单位： | [1]StateKeyloboratoryofCoastalandOffshoreEngineering,DalianUniverityofTechnology,Dalian116024,China [2]DepartmentofCivilEnginerring,CurtinUnitersityofTechnology,WesternAustralia6845,Australia |
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| 基金项目： | theAustralianResearchCouncilthroughtheLargeARCdiscovery scheme(GrantNo.A00105806) |
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| 摘 要： | The spudcan foundation has been widely used in offshore engineering for jack-up figs. However, “punch through”failure often occurs where a stronger soil layer overlays a softer soil layer. In this study, spudcan penetration into double layered soils is investigated numerically. The soil profde is set up as a stronger soil layer overlaying a softer soil layer,with the soil strength ratio ( bottom soil strength / top soil strength) varied from 0.1 to 1.0 ( 1 means uniform soil). The bearing bohaviour is discussed and the beating capacity factors are given for various cases involving different layer thicknesses and different strength ratios of the two clay layers. The development of the plastic zones and the effect of soil selfweight on the beating capacity are also discussed. From this study, it is found that, when a spudcan is distant from the soil layer boundary, the spudean can be analysed with single soil layer data. However, when a spudcan becomes closer to the soil boundary layer, the influence of the lower soft soil layer is significant, and the beating capacity of the spudean decreases. The critical distance is an indication of the occurrence of “punch through” failure. The critical distance between the spudcan and the layer boundary is larger for a rough spudean than the one for a smooth one, and the critical distance decreases with increasing soil strength ratio. The depth of cavity formed during initial spudcan penetration depends on the top layer soil strength, soil strength ratio and unit soil self-weight, and the cavity affects the spudcan beating behaviour as well.
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| 关 键 词： | 深度渗透 双层土壤 海上工程 临界距离 连续分布 |
Deep Penetration of Spudcan Foundation into Double Layered Soils |
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| Abstract: | |
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| Keywords: | spudcan foundation punch through failure double layered soil critical distance continuous penetration |
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