以下为句子列表：
英文: In order to know the characteristics of the material, analysis on the particle gradation and the related tests on seepage and seepage deformation are made, with which the problems related to the cushion layer material mainly composed of the natural sandy
中文: 为掌握其特性，进行了颗粒级配分析、渗透和渗透变形等项试验，研究解决了以天然砂砾料为主的垫层料的水力学指标问题，满足了工程需要，可为类似工程应用提供参考。
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英文: The cushion layer for the dam is constructed with the material prepared mainly with natural sandy gravel and mixed with proper amount of pebble and coarse sand.
中文: 大坝垫层料采用以天然砂砾料为主、掺入小石和粗砂以调整级配的方式生产。
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