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。
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 foundation of the dam for Dalong reservoir consists of the layer of medium-coarse sand with gravel, so it is difficult to be penetrated even by the high-power vibrator.
大隆水库大坝坝基为含卵砾中粗砂层，即使大功率振冲器也难以贯入。
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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