对浮动床周期制水量减少的原因进行多方面分析，通过分析发现原水中离子含量增加是浮动床周期制水量减少的主要原因。
Through analyzing the reasons of period water reduction in floating bed, it is the concluded that the ions content in raw water is the main reason.
结合碎石土的特点，采用细粒土含量控制试样的含水量，在同一竖向压力下制样。
According to the feature of gravel-soil, the water content of sample is controlled by granule soil content and sampled under the same vertical pressure.
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