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.
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 frost heave ratio, as an index of classification of frost susceptibility for sandy gravel, mainly depends on not only the. content of fine grained soil but also its freezing condition.
饱水砂砾料冻结时之冻胀敏感性，以冻胀率的大小作为分类指标。 它主要受细粒土含量及冻结条件的影响。
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