poor grain size distribution
grain-size distribution curve 粒度分布曲线 poorly grain-size distribution 不良级配 index sample grain-size distribution 单样颗粒级配 ..
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不良级配的 Poorly graded
不良级配土 poorly-graded soil
级配不良的砂 badly graded sand
级配不良土 graded soil
级配不良 Poorly Graded
级配不良的 badly graded
并通过试验得出，含一定量细粒组分且级配良好的粗粒土渗透破坏坡降比级配不良的粗粒土渗透破坏坡降普遍要高的结论。
And it comes to a conclusion that the permeation damage slope of the coarse-grained soil of well graded with a definite proportion of fine granule is higher than that of poorly graded.
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