循环荷载作用下海床结构粉质土的液化渗流机理定性研究

通过对黄河三角洲海床粉质土的基本性质和循环荷载作用下的喷水冒砂现象的分析，认识了海床粉质土的结构性。利用岩土破损力学原理，建立了海床结构粉质土的二元介质模型。定性分析了结构带土体在加荷、卸荷、液化渗流过程中的变形破损和在液化渗流过程中有效应力和超孔隙水压力的相互转化，指出在液化深度内，土体恢复后的固结强度应提高。这与试验结果相一致。用二元介质模型对解释试验中液化渗流差异是结构带内出现喷水冒砂和结构体上出现遍地冒水现象。

Qualitative study on mechanism of liquefaction and seepage of seabed structure silty soil under cyclic loads

The structure of the seabed silty soil in the Yellow River delta is understood by its properties and piping phenomena under cyclic loads.Applying breakage mechanics,a double-medium model composed of structural lumps and structural bands is established.During the process of increase loads,decrease loads and liquefaction seepage,deformation and breakage in the structural bands and exchange of effective stress and pore water pressure are qualitatively researched.Qualitative analysis indicates that the strength of consolidation should be increased within the depth of liquefaction,which accords with the result of test.Experiment shows that the different phenomena of liquefaction seepage are regarded as cause of existing piping in structural bands and water discharge in structural lumps with the double-medium modeling.