The invert siphon project in Zhongyishui lies in the sand and gravel layer, with rich groundwater and high seepage coefficient.
中易水倒虹吸工程建筑物所处地层为砂卵层，地下水丰富，渗透系数大。
The infiltration protection wall of deepest of over 80 meters at Xiaolangdi dam is the key project to control infiltration in the sand and gravel layer at dam base.
小浪底主坝防渗墙是坝基砂砾石覆盖层渗流控制的关键工程，最深达80多米。
The cushion layer for the dam is constructed with the material prepared mainly with natural sandy gravel and mixed with proper amount of pebble and coarse sand.
大坝垫层料采用以天然砂砾料为主、掺入小石和粗砂以调整级配的方式生产。
C. Vibration strike: it is used in drilling and casing with loosen sand, cobble stone and gravel layer etc.
振动击打：用于松散的砂、卵石、碎石地层的钻进及下套管等。
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 lithologic substratum is made of gravel, sand and clay with a layer of loess.
岩性底层是由砾石，沙质土，粘土与黄土层组成。
The lithologic substratum is made of gravel, sand and clay with a layer of loess.
岩性底层是由砾石，沙质土，粘土与黄土层组成。
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