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海底管线周围海床的地震液化分析

Keywords: 海底管线,地震荷载,累积孔隙水压力,液化

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Abstract:

地震荷载作用下海床液化是海底管线失稳的主要原因之一.本文建立了地震荷载作用下海底管线周围海床液化的有限元模型,采用土工静力-动力液压三轴-扭剪多功能剪切仪,将不排水循环扭剪试验条件下得到的孔隙水压力增长模式引入到二维动力固结方程中,基于有限元方法对推广的固结方程进行数值求解,得到了地震荷载作用下海床中累积孔隙水压力的发展过程与变化规律.通过变动参数计算了海床土性参数和管线几何尺寸对由地震所引起的管线周围海床中累积孔隙水压力分布的影响,进一步对管线周围海床的液化势进行了评判.

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