Many problems should be researched in the further engineering application. In the paper, author analyzed groutability of permeation in sand and gravel stratum from character of grouting grouts and internal permeation structure.
这主要是因为影响浆液在砂砾地层中运动的因素非常多，砂砾地层内部构造非常复杂和多变，给砂砾层渗透注浆的研究带来了很大的困难，至今还没有非常完善的设计理论及设计方法对其进行指导，许多问题还有待进一步研究和工程实践的证实。
参考来源 - 砂砾地层渗透注浆的可注性及应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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；
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