顶板厚沙土层；
The sand stratum in old river bed is important factor affecting stability of dam.
古河道砂层的存在，是影响围坝稳定的主要环境因素。
It is difficult for mined tunnel with shallow cover to cross water-rich sand stratum.
穿越富水砂层一直是浅埋暗挖隧道的难点。
According to I ts origin, sapphire sand strata are divided into sand wash stratum, pluvial stratum and relict drifted sand stratum, while sapphire concentrated well in drifted sand stratum.
根据成因蓝宝石砂矿层分为冲积砂矿层、洪积砂矿层和残坡积砂矿层；洪积砂矿层中蓝宝石最富。
With the construction of the Through-street Tunnel under the Binhai Avenue as a practical example, this article describes the construction technology for tunnels crossing water-rich sand stratum.
结合深圳滨海大道过街隧道的施工实践，分析了隧道所处的工程地质和水文地质情况，详细介绍了隧道穿越富水砂层的施工技术。
Sometimes, in order to overcome these shortcomings to use bored piles and post-grouting pile, but bored piles are difficult to drilling in sand stratum, drill pipe sticking and dropping often appears;
有事为了克服以上缺点改用钻孔灌注桩和后压浆灌注桩，但灌注桩在砂土地层中也不易钻进，常出现卡钻、掉钻；
Geologist can interpreted the lithology, era, sand thickness, sedimentary sequence of the stratum, folding, small fault from the processed depth-density profile.
从深度、密度剖面中，地质人员可以解释出地层的岩性，时代、砂体的厚度、沉积旋回、沉积粒序，几米、十几米的断层和褶皱。
The empirical formula is fairly suitable to the sand or mudstone stratum, but it is inapplicable to the coal stratum.
这些经验公式砂、泥岩层比较适用，而对含煤地层则不适用。
These sand gravels stratum have the characters of shallow cover, small transform, high bearing capability and big thickness.
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。
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；
Whether the natural sand gravel stratum in the river bed would serve as the foundation of the superhigh faced rockfill dam or not was one of the key technical problems of the project.
河床天然砂卵砾石层能否作为超高面板坝坝基是该工程的关键技术问题之一。
The ground stratum is quite complex, with silt layer and fine sand layer mixed, so the construction is difficult to be carried out and the requirement of pit support is strict.
基坑所处地层十分复杂，有较厚的淤泥层和细砂层，基坑支护要求高，施工难度大。
At the stratum, the content of sand and clay varies in an opposite way, while the content of silt remains quite stable.
两柱状样地层中粉砂含量基本不变，砂与粘土含量则呈此消彼长。
At the stratum, the content of sand and clay varies in an opposite way, while the content of silt remains quite stable.
两柱状样地层中粉砂含量基本不变，砂与粘土含量则呈此消彼长。
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