摘要
运用三维有限元差分软件FLAC3D对混凝土桩加固的地基建立模型,对天然地基以及桩基地震液化前后地基模型的加速度、位移以及桩基的液化情况等进行数值模拟和系统对比分析,得到4种工况地基的加速度变化情况以及地基液化特点。计算结果表明加速度在非液化层传播呈放大趋势,而液化层对地震波的传播有明显削弱作用。在相同地震动作用下,天然地基的超孔压比值超过0.75的单元略多于桩基,桩对消除地基液化作用有限。研究成果可以作为类似的工程实例的参考。
Three dimensional finite element difference software FLAC3 D is used to establish the model for the foundation of the reinforced concrete pile piles.Then through the numerical simulation and systematic comparative analysis of the acceleration,displacement and the liquefaction situation of the foundation pile of the natural foundation model and pile foundation model before and after seismic liquefaction,we obtained the acceleration variation and the characteristic of foundation liquefaction in four conditions.The calculation results show that the propagation of acceleration in the non-liquefied layer is appear a trend of amplification,however,the propagation of seismic wave in the liquefied layer has the effect of significantly weakened.Under the same ground motion,the unit that the ratio of excess pore pressure of natural foundation exceeds 0.75 is more than that of pile foundation,and the effect of the pile on the eliminating the foundation liquefaction is limited.The obtained results can be used as a reference for the similar engineering cases.
出处
《地震研究》
CSCD
北大核心
2016年第1期67-73,180,共7页
Journal of Seismological Research
基金
辽宁省教育厅项目(L2015035)
大连市科技计划项目(2014E13SF145)联合资助
关键词
天然地基
桩基
加速度
地震液化
数值模拟
FLAC3D
natural foundation
pile foundation
acceleration
foundation
liquefaction
numerical sim ulation
FLA3D
