bottom layer of subgrade bed

The filler of the surface layer of subgrade bed is graded broken stone and the bottom layer of subgrade bed is A、B group filling, all the padding have been taken from the Sui-Yu Railway Line experiment section work site.
基床表层填料性质为级配碎石，基床底层填料性质为A、B组填料，所有填料均取自遂渝线无碴轨道综合试验段工地现场。