Gradation of sand column and sediment concentration of muddy water and water head are remarkably effective factors for the fine grain distribution in sand column.
砂柱的颗粒组成、水含沙量和入渗水头对滞留分布产生显著的影响。
This method is effective, and it has important significance on improving the quality of sieve analysis sand grains gradation.
方法行之有效，对提高筛析泥沙颗粒级配的质量有着重要的意义。
Weathered sand has benefits of wide spread, plenty of source and low cost. However it has drawbacks of low strength and unstable gradation.
风化砂具有分布广泛、料源丰富、造价低廉的优点，同时又有强度低、级配不稳定等缺点。
The river deposit, which is made up of naturally graded sand and gravel, is characterized by its well gradation, easy control of its particle size, easy compaction and good permeability.
这种天然级配砂砾具有级配良好、粒径易控制、易碾压成型、透水性好等特点。
The river deposit, which is made up of naturally graded sand and gravel, is characterized by its well gradation, easy control of its particle size, easy compaction and good permeability.
这种天然级配砂砾具有级配良好、粒径易控制、易碾压成型、透水性好等特点。
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