【摘要】 利用基于Biot方程耦合场分割算法的ANSYS有限元软件二次开发形成的岩土工程有效应力分析模块,对某水库围堤坝基进行了液化震陷分析。计算中选取具有代表性的堤坝断面建立二维有限元模型,并采用上海50a超越概率10%的人造地震波加速度-时程作为基底输入地震。计算得到围堤孔隙水压力与有效应力比的分布情况以及震陷分布情况。分析结果表明,坝基中心部位的孔隙水压力比要比坝脚两侧的孔隙水压力比小,坝基中心部位可以不进行地基处理。该方法可为今后其他类似工程的设计和施工提供参考。更多还原

【Abstract】 Using an effective stress dynamic analysis module which is compiled from secondary development of ANSYS on the basis of partitioned solution procedures of Biot equation coupled mechanical systems,analysis on liquefaction shock settlement of the embankment foundation of a reservoir is performed.In the calculation,two-dimensional finite element model of representative embankment section is set up;and input ground motion is artificially composed seismic accelerations with a 10% transcendental probability for 50 years in Shanghai.Distribution of ratios of pore water pressure and effective stress of embankment foundation of reservoir and distribution of seismic subsidence of the embankment are obtained by calculation.As demonstrated by the analysis,ratio of pore water pressure of central part of the embankment foundation is smaller than that of both sides of the embankment foundation;and foundation treatment is not necessary for the central part of the embankment foundation.The method can provide references for design and construction of other similar projects.更多还原