多级配砾石土反滤设计方法试验研究 English Version
Study on Filter Design of Broadly-Graded Soil
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摘要: 多级配砾石土反滤层工作机理及设计方法的研究，国内外均刚开始。本文通过试验研究，主要阐明以下几个问题：①反滤层研究的主要内容是确定极限反滤的等效粒径值。多级配土极限等效粒径的确定原则是在反滤进口能形成自滤的反滤层，从而保证土的渗透稳定性。②多级配砾石土是不均匀系数大于１００的土，具有较多无粘性土的渗透稳定性质，因此可以直接采用无粘性土反滤设计的一般数学模型。③控制粒径出现的机率不再是常数，它随土的渗透稳定性质而变化，文中给出了控制粒径确定的方法。④给出反滤层的设计准则Abstract: It has just begun to study the mechanism and design method of broadly graded soil filter. By tests in this paper the following main question are solved:①to determine the equivalent grain size of critical filter under the principle of forming self filtration layer in the interface between filter and soil to make soil seepage stability; ②the general model of cohessionless soil fiter design is used in the filter design of broadly graded soil, because the seepage stability of broadly graded soil with coefficent of uniformity greater than 100, is similar with that of cohessionless soil; ③the appearing propability of control size changes with seepage stability of broadly graded soil, and it is not a constant, so the method to design control size, d k=d（<2）p.70 is presented in the paper;④ the criterion for filter design is D 20 ≤（4～7）d k.
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