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海港工程中防波堤地震残余变形的预测以及震损机制的分析是较复杂的问题。采用定义在应变空间中考虑土体动主应力轴方向偏转影响的多重剪切机构塑性模型,分别从砂性土的黏粒含量和标贯击数2个主要影响因素对防波堤地震变形的变化机制进行了有效应力分析,得出防波堤较大的残余变形是由于地震作用下土体中孔隙水压力的升高致使土体软化而产生的。然后,采用液化度单一指标从物理本质上来间接表征防波堤的残余变形,得到防波堤残余变形与液化度之间的函数预测关系,预测值与震害调查值以及数值分析值基本相符,表明所得液化度预测公式具有一定的可靠性。残余变形的液化度预测法可为类似防波堤地震灾害设计与评价提供参考依据。
Prediction of earthquakish residual deformation in harbor engineering and analysis of earthquake damage mechanism are complex problems. Based on the plastic model of multiple shear mechanism, which is defined in the strain space, the influence of principal axis of soil motion on the deflection of the main stress axis, the change mechanism of the seismic breakwaters from two main influencing factors of the clay content and the number of standard penetration strikes The effective stress analysis shows that the larger residual deformation of the breakwater is caused by the softening of the soil due to the increase of the pore water pressure in the soil due to the earthquake. Then, a single index of liquefaction degree is used to characterize the residual deformation of the breakwater indirectly from the nature of physics, and the function prediction relationship between breakwater deformation and degree of liquefaction of the breakwater is obtained. The predicted value basically agrees with the survey value and the numerical analysis value, Prediction formula has certain reliability. The liquefaction prediction method of residual deformation can provide a reference for the design and evaluation of similar breakwater seismic disaster.