筒型基础平台冰激振动下粘性土地基软化分析
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摘要
为了解决由于海冰力对筒型基础平台作用而产生地基土软化,降低平台承载力的问题,应用冰激振动理论对筒型基础平台进行了冰激振动分析,通过相应的有限元计算得到筒体周围土体剪应力的最大变化幅值,并将计算结果与对应位置土体的抗软化极限应力进行了对比分析,结果表明:土体在冰激振动软化方面是安全的。提出一种判断筒型基础土体软化可能性的新方法,该方法可以对筒型基础平台冰激振动基础的安全性作出评价,对筒型基础平台的设计起到积极的指导作用。
For resolving the problem of reduced bearing capacity caused by the softening of the soil,which is induced by ice load,around the bucket of the platform,the ice-induced vibration of the bucket foundation platform by using the self-excited vibration theory is analyzed.Then the main shear stresses of the soil around the bucket are obtained by using the finite element program.By comparing the dynamic stress to the maximum strength of soil,the safe result is given.The new method that estimates the soil softening around the bucket foundation is put forward.It can assess the safety of soil softening and has guidance function for the design of bucked foundation platform.
For resolving the problem of reduced bearing capacity caused by the softening of the soil,which is induced by ice load,around the bucket of the platform,the ice-induced vibration of the bucket foundation platform by using the self-excited vibration theory is analyzed.Then the main shear stresses of the soil around the bucket are obtained by using the finite element program.By comparing the dynamic stress to the maximum strength of soil,the safe result is given.The new method that estimates the soil softening around the bucket foundation is put forward.It can assess the safety of soil softening and has guidance function for the design of bucked foundation platform.
引文
[1]Chung K Y C,Wong I H.Liquefaction Potential of Soils with Plastic Fines[C]//Soil Dynamics&Earthquake Engineering Conference,Southampton,1982:13-15.
[2]李顺群,张业民.砂沸的应力演进过程研究[J].辽宁工程技术大学学报,2003,22(6):769-771.
[3]官全美,周顺华,王炳龙,等.粉细砂层盾构隧道地基的地震液化判别[J].铁道学报,2000,22(5):47-53.
[4]Seed H B,Idriss I M.Simplified Procedures for Evaluating Soil Liquefaction Potential[J].Journal of Soil Mechanics and Foundations,ASCE,1971,97(SM9):1249-1273.
[5]Seed H B,Idriss I M.Evaluation of Liquefaction of Sand Deposits Based on Observation of Performance in Previous Earthquakes[C]//In Situ Testing to Evaluate Liquefaction Susceptibility,ASCE National Convention,1981:123-142.
[6]Ding Hongyan,Qi Lan,Du Xiuzhen.Estimating Soil Liquefaction in Ice-induced Vibration of Bucket Foundation[J].Journal of Cold Regions Engineering,2003,17(2):60-67.
[2]李顺群,张业民.砂沸的应力演进过程研究[J].辽宁工程技术大学学报,2003,22(6):769-771.
[3]官全美,周顺华,王炳龙,等.粉细砂层盾构隧道地基的地震液化判别[J].铁道学报,2000,22(5):47-53.
[4]Seed H B,Idriss I M.Simplified Procedures for Evaluating Soil Liquefaction Potential[J].Journal of Soil Mechanics and Foundations,ASCE,1971,97(SM9):1249-1273.
[5]Seed H B,Idriss I M.Evaluation of Liquefaction of Sand Deposits Based on Observation of Performance in Previous Earthquakes[C]//In Situ Testing to Evaluate Liquefaction Susceptibility,ASCE National Convention,1981:123-142.
[6]Ding Hongyan,Qi Lan,Du Xiuzhen.Estimating Soil Liquefaction in Ice-induced Vibration of Bucket Foundation[J].Journal of Cold Regions Engineering,2003,17(2):60-67.
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