双层堤基渗透破坏机制和数值模拟方法研究

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摘要归纳和分析不同覆盖层模拟材料对堤基渗透破坏发展影响试验的现象和结果。在此基础上对堤基渗流破坏产生和发展的机制进行分析，提出反映堤基渗透破坏本质的2个判据，即土体单元应力强度和颗粒在水中滚动力矩2个极限平衡判断条件。根据试验现象观察，采用二维轴对称对堤基渗透破坏渗流场进行模拟，将覆盖层对下卧砂层的影响简化为对堤基应力场的改变，再利用提出的2个判据，对堤基渗透破坏发展过程进行数值模拟研究。数值模拟结果和试验对比表明，上述模拟方法和判据合理、可行。

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关键词 ：土力学, 双层堤基, 渗透破坏, 数值模拟, 有限元法

Abstract：This article summarized and analyzed the results of sand box test，simulated the seepage failure of the double-layer dike foundation. These experiments are focus on the affection of the different characteristics of simulated cover-materials on the seepage failure. Base on above analyzing，two criterions are derived. One is the stress strength，considering the seepage force. The other is the limited balance of the rotational moments of soil particle. Meanwhile according to the observed phenomena of experiments，the seepage failure is simulated by the two-dimensional axisymmetric finite element method(FEM). Compared the results between the experiment and numerical simulation，the above research method and two criterions on the seepage failure are reasonable，feasible.

Key words： soil mechanics double-layer dike foundation seepage failure numerical simulation finite element method(FEM)

收稿日期: 2011-03-18

引用本文:

周红星，曹洪. 双层堤基渗透破坏机制和数值模拟方法研究[J]. 岩石力学与工程学报, 2011, 30(10): 2128-2136.
ZHOU Hongxing，CAO Hong. RESEARCH ON MECHANISM AND NUMERICAL SIMULATION METHOD OF SEEPAGE FAILURE OF DOUBLE-LAYER DIKE FOUNDATION. , 2011, 30(10): 2128-2136.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I10/2128

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