The model stratums mainly included miscellaneous filling soil surface, interaction stratum of silty clay, silt and fine sand and pebble roundgravel at the bottom of station tunnel.
模型介质材料分别模拟地表杂填土层，粉质黏土、粉土、粉细砂互层和车站隧道底部的卵石圆砾层；
2
The gravel-pit was very large, with grass and wild flowers round the sides at the top.
砾石坑大极了，坑口四周长着青草和野花。
3
On the basis of gravel engineering quality, rolling parameter and rolling means, the compaction quality with gravel as flood prevention embankment and highway subgrade is analyzed in an all-round way.