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由于可液化砂质土应力-应变特性模拟的复杂性及数值计算的不稳定性,深厚砂质覆盖层土坝的弹塑性地震反应分析是土坝抗震研究中的一个尚未完全解决的课题。采用u-p完全耦合的饱和多孔介质有限元分析方法和砂土多重机构弹塑性模型,对遭受M6.7级地震的国外某深厚砂质覆盖层土坝进行弹塑性地震反应分析,研究了坝体和地基的动力反应特性及其超静孔隙水压力产生、扩散和消散的变化规律。结果表明:计算得到的坝体加速度和永久变形与实测值存在一定的差异,但基本上反映了坝体加速度与永久变形的实际分布情况,从而说明采用的本构模型和计算方法具有一定的精度;由于坝体和坝基的超静孔隙水压力较小,且坝体永久变形不大,可以不对坝体和坝基进行加固处理;坝趾附近浅层地基的超静孔隙水压力较大,有可能发生液化,因此,须采取相应的抗液化加固措施。
Due to the complexity of numerical simulations and the complexity of the stress-strain behavior of liquefiable sandy soil, the analysis of elastoplastic seismic response of earth mounds with deep sandy overburden is an issue that has not yet been completely solved in earth-quake resistance study. The elasto-plastic seismic response analysis of a deep sandy overburden dam subjected to an M6.7 earthquake using the up-coupled finite element method of saturated porous media and the elasto-plastic model of sand multiple structures was conducted. DYNAMIC RESPONSE CHARACTERISTICS OF SOIL FOUNDATION AND THE VARIATION OF PRODUCTION, DIFFUSION AND DISSIPATION OF OVERLAP PORE WATER PRESSURE. The results show that there is a certain difference between the calculated acceleration and the permanent deformation of the dam body and the measured value, but it basically reflects the actual distribution of the acceleration and the permanent deformation of the dam, which shows that the constitutive model and the calculation method adopted have certain accuracy The excess pore water pressure on the shallow foundation around the dam toe can not be strengthened due to the excess pore water pressure of the dam body and dam foundation and the permanent deformation of the dam body is small, Liquefaction occurs, therefore, to take appropriate anti-liquefaction reinforcement measures.