When there was cushion layer, the material gradation of cushion layer have effect on the tamp energy's transfer.

分析存在垫层时，垫层材料的级配对夯击能量的传递效果；

youdao

When there was cushion layer, the material gradation of cushion layer have effect on the tamp energy's transfer.

分析存在垫层时，垫层材料的级配对夯击能量的传递效果；

youdao