砂卵石，对于浑圆状颗粒，分为圆砾石、卵石、漂石、砾石土、砂卵石等；对棱角状颗粒，分为角砾石、碎石、块石、碎石土等。
注入泥浆和泡沫的混合液对砂卵石地层进行塑流化改善效果良好。
Injecting the mixing liquid of mud and foam achieves good effects for plastic flow property conditioning of gravel with sand.
这些砂卵石层一般具有埋深不大、变形小、承载力高、厚度大的特点。
These sand gravels stratum have the characters of shallow cover, small transform, high bearing capability and big thickness.
在砂卵石地层中勘察钻探时，要解决三个关键性的问题：一是钻进进尺问题；
There have three decisive questions need to solve while drilling in sand gravel layer. The first question is drilling footage.
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