Sand DAMS, which are constructed out of concrete barriers 1-5m high and backfilled with sand, were voted as the best idea from five different proposals.
用混凝土护栏建造的1至5米高且用沙回填而成的砂坝从5个不同方案中脱颖而出，被选为最佳方案。
They can be backfilled with concrete or plastered on the inside to beef them up.
它们可以回填混凝土或灰泥在里面的牛肉他们。
The dynamics finite element program LS-DYNA3D is employed to simulate the high-explosive explosion experiment in granite, which has a crooked tunnel that is backfilled with concrete stemming.
采用显式动力学有限元程序LS-DYNA3D，对花岗岩介质中带拐弯坑道回填堵塞的化爆试验进行数值模拟。
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