地震液化引起地面大位移预测方法研究

    A STUDY ON PREDICTION-METHOD OF LARGE GROUND DISPLACE-MENTS CAUSED BY SEISMIC LIQUEFACTION

    • 摘要: 提出了一种地震液化引起地面大位移预测方法.用变分原理和流体力学方法推导出了地震过程中的位移公式和地震停止后由于孔隙水压力消散持续时间的影响(即液化土的固结变形过程),液化带上覆非液化层的大位移公式及液化物质位移和速度公式.并以1920年宁夏海原大地震(Ms为8.5)时石碑源黄土状粉细砂土液化引起地面大位移为例,对提出的各个公式进行了验证,结果与实际情况一致.

       

      Abstract: A prediction-method of large ground displacements caused by seismic liquefaction is presented in this paper.The formulae of displacement during earthquake, large ground displacement of non-liquefaction layer which is laid on the liquefaction one induced by duration of pore water pressure diffusion after earthquake, displacement and veloaty of liquefaction materials are deduced on the principle of variation and the method of fluid mechanics. In order to check these formulae, take the example of the large ground displacements caused by Shibiyuan sandy loess seismic liquefaction which was triggered by 1920 Haiyuan earthquake(Ms=8.5),Ningxia Autonomous Region of Hui-Minority, China. The computed results quite agree with the evidences in field.

       

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