But for triple stratum foundation, if the top sand layer is relatively thin, piping is vertical. The damage zones are large in width and depth that expand to the sand layer and gravel layer.
当三层堤基浅砂层较薄时，将发生深层管涌破坏，管涌破坏区涉及浅砂层及下部砂砾石层，其宽度和深度较双层堤基大，出口涌砂量也较多。
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 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；
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