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；
The model stratums mainly included miscellaneous filling soil surface, interaction stratum of silty clay, silt and fine sand and pebble round gravel at the bottom of station tunnel.
南宁盆地圆砾颗粒组成均匀，胶结紧密，分布连续，是较理想的桩端持力层。
In Nanning basin, the circular-gravel layer is an ideal bearing stratum of piles, because of it's homogeneous particle composition, compact cohesion and continuous distribution.
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