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波浪作用下海床的稳定性与液化分析是海底管线、防波堤和海洋平台设计中必须仔细考虑的问题 .本文推荐了一个循环荷载作用下土体的弹塑性实用本构模型 ,并给出了一种粉土的模型参数 .该模型直接根据初始应力状态和循环应力的大小与作用时间计算土体的塑性应变增量 ,在有限元计算中不需要引入弹塑性矩阵 .采用Biot理论和有限单元法 ,对海床有效应力的变化过程分析表明 ,波腹点下海床存在较大的液化可能性 .波浪作用对海床存在一定的压密作用 .
The stability and liquefaction analysis of seabed under waves is a problem which must be carefully considered in the design of subsea pipeline, breakwater and offshore platform.This paper presents a practical elasto-plastic constitutive model of soil under cyclic loading and gives a Which is used to calculate the plastic strain increment of soils directly according to the initial stress state and the cyclic stress and the action time.There is no need to introduce elastoplastic matrix in the finite element calculation.By Biot theory and finite element method, The analysis of the change process of the effective stress at seafloor shows that there is a large possibility of liquefaction in the antiscotic seafloor, and the wave action has certain compressive effect on the seafloor.