According to the impact tests of the tunnel layer model,the paper analyzes the boundary effect of the filled quartz sand and similar ma-terial sand,and points out the quartz sand has better wave absorption and capacity to dissipate the impact wave of the free surface,while the simi-lar material sand can be used to improve the boundary effect effectively.%通过坑道模型抗冲击试验，分析了填充石英砂与相似材料砂的边界效应，指出石英砂具有较好的吸收波作用，能很好地消散达到自由面的冲击波，相似材料砂则可以有效改善边界效应。
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