sand-gravel strata 砂砾石地层
sandy gravel strata 砂卵石层
sand and gravel strata 砂卵石地层
gravel strata of aquifer 含水砂砾层
most think gravel strata 巨厚砾石层
cobble and gravel strata 圆砾卵石层
Gravel strata, which is very abroad distribution in our country, is familiar bad ground for civil engineering. It is difficult for civil engineering experts to improve capability of gravel all through.
砂卵(砾)石层在我国分布广泛,是土木工程常见的复杂地层,如何改善砂卵(砾)石层的性能一直是工程界所关注的问题。
参考来源 - 砂卵（砾）石层模拟注浆试验及渗透注浆机理研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Gravel strata is a kind of typical instable layer in drilling engineering.
卵砾石地层是钻探工程中常见的一种典型的不稳定地层。
The study show that the tunnel behavior under gravel strata can be effectively simulated by means of granule mechanics numerical simulation technology.
研究结果显示利用颗粒力学数值模拟技术，能更有效模拟砾石层特殊地工特性的隧道行为。
Lower Urho Formation in Region 8 of Karamay Oilfield is an important oil-bearing series, where gravel is dominated. the classification and correlation of its strata are the long existed problems.
克拉玛依油田八区下乌尔禾组为一套以砾岩为主的粗碎屑沉积，是该区最重要的含油层系。 对其地层的划分与对比，是长期存在的一个问题。
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