循环荷载下软黏土不排水强度弱化分析的动力有限元ABAQUS实现

发布时间：2018-08-29 10:46

【摘要】：在波浪循环荷载作用下饱和软黏土地基出现孔隙水压力升高,并导致不排水强度弱化,严重影响防波堤的承载性能。考虑静偏应力影响,基于最大孔隙水压力发展模型和正常固结软黏土不排水强度公式,推导出软黏土不排水强度随循环荷载作用次数和应力水平变化的动态折减规律。结合软黏土不排水强度动态折减规律和M-C屈服准则,在有限元软件ABAQUS上实现软黏土不排水强度循环弱化分析的数值开发和动力运算过程。运用该动力有限元方法对天津港防波堤地基软黏土的动、静三轴试验进行数值模拟运算。结果表明,最大孔隙水压力发展曲线以及循环荷载作用后不排水强度的数值预测结果与动三轴试验结果吻合良好。另外,动力有限元方法(DFEM)能够表示土体强度在循环荷载作用下的具体弱化过程。
[Abstract]:Under the action of wave cyclic load, the pore water pressure of saturated soft clay foundation increases, which leads to the weakening of undrained strength, which seriously affects the bearing capacity of breakwater. Based on the maximum pore water pressure development model and undrained strength formula of normal consolidated soft clay, the dynamic reduction law of undrained strength of soft clay with cyclic load and stress level is deduced. Combined with the dynamic reduction law of undrained strength of soft clay and M-C yield criterion, the numerical development and dynamic calculation process of cyclic weakening analysis of undrained strength of soft clay are realized on the finite element software ABAQUS. The dynamic finite element method is used to simulate the dynamic and static triaxial tests of soft clay on the foundation of Tianjin Port breakwater. The results show that the maximum pore water pressure development curve and the numerical prediction results of undrained strength after cyclic loading are in good agreement with the dynamic triaxial test results. In addition, the dynamic finite element method (DFEM) can represent the concrete weakening process of soil strength under cyclic load.
【作者单位】：交通运输部天津水运工程科学研究院;天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金创新研究群体科学基金(No.51321065);国家自然科学基金(No.51279128,No.51479133,No.51109157) 交通运输部交通建设科技项目(No.2013328224070)~~
【分类号】：TU447

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