ABSTRACT The mechanism of void development inside the backfill of a concrete riprapped seawall was investigated through laboratory experiments and numerical modeling. Laboratory experiments have been conducted in an oscillatory flow tunnel. The leakage of sand through a small gap from an acrylic container has been examined with and without a large void in the container. The leakage rate was found to increase with the total void volume inside the container, thus suggesting the accelerated expansion of the void in the seawalls. In order to understand the role of pressure transmission in the backfill medium, a numerical model has been proposed based on the quasi-static assumption on Biot’s consolidation equation using finite difference method in the one-dimensional domain. Results from the developed model using appropriate permeability and compressibility values demonstrated that the accelerated expansion of void could be developed by the compression of air void due to the transmission of oscillatory pressure through a gap.

中文翻译：

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混凝土抛石海堤孔隙发育加速机制

摘要 通过实验室实验和数值模拟研究了混凝土抛石海堤回填土内空隙发展的机制。实验室实验是在振荡流隧道中进行的。沙子从亚克力容器的小缝隙渗漏的情况已经过检查，容器中有和没有大的空隙。发现泄漏率随着容器内总空隙体积的增加而增加，因此表明海堤中空隙的加速膨胀。为了理解压力传递在回填介质中的作用，基于Biot固结方程的准静态假设，在一维域中使用有限差分方法提出了一个数值模型。