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以变形作为地震工程安全设计的控制标准是近年来逐渐发展的趋势,海港公路工程中大型重力式沉箱码头在液化地基中的地震残余变形的分析是较复杂的。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的动力有效应力分析方法,分别从地震加速度幅值、码头底部置换砂与码头身后回填砂土的标贯击数、处理范围以及码头宽高比等详细分析了码头地震残余变形随各影响因素的变化规律,结果表明,地震动水平、置换砂处理厚度、标贯击数和码头的宽高比是较敏感的影响因素,对残余变形具有显著的影响,且回填砂的加固存在一个合理有效范围。计算绘出的一系列分布图有助于工程设计者初步预测码头的地震残余变形。
Taking the deformation as the control standard for the seismic design of seismic engineering is a trend of gradual development in recent years. The analysis of the residual seismic deformation of the large-scale gravity caisson wharf in liquefied ground is quite complicated. The dynamic effective stress analysis method for the plastic model of multiple shear mechanism, which is based on the deflection of the main stress axis of soil, which is defined in the strain space, is adopted. From the seismic acceleration amplitude, the bottom of the quarry, The number of hits, the range of treatment and the aspect ratio of the wharf, the variations of the residual deformation of the wharf with the influencing factors are analyzed in detail. The results show that the level of ground motion, the thickness of replacement sand, the number of standard penetrations and the wharves’ Sensitive factors have a significant impact on the residual deformation, and there is a reasonable and effective range for the consolidation of backfill sand. Calculating a series of profiles helps engineers to predict the deformation of the quake at the terminal.