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1·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。

2·There have three decisive questions need to solve while drilling in sand gravel layer. The first question is drilling footage.

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；

3·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。

4·Thermal characteristics of the gravel layer in the system heated by hot water natural circulation with solar collector were studied.

对由太阳能集热器热水自然循环加热的太阳能热转换系统卵石层的热特性进行了实验研究。

5·Composite sealing layer is a combination of connected gravel layer, gravel layer sealing systems, and Micro-surfacing (Slurry seal) system.

复合封层是碎石联结层、碎石封层系统和微表处(稀浆封层)系统的结合。

6·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。

7·In Nanning basin, the circular-gravel layer is an ideal bearing stratum of piles, because of it's homogeneous particle composition, compact cohesion and continuous distribution.

南宁盆地圆砾颗粒组成均匀，胶结紧密，分布连续，是较理想的桩端持力层。

8·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。

9·Lay a 2-inch layer of pebble-sized gravel around the plants. Choose a gravel color to complement your home or the flowers in your desert garden.

在植物周围铺上2英尺厚的砾石。砾石的颜色需和您的房屋以及植物本身的颜色相协调。

10·It is wise to start infilling with a layer of gravel for drainage.

先铺上一层利于排水的砾石是个明智的做法。