水布垭心墙堆石坝宽级配防渗料的反滤研究

Study on Filter of Wide Grading Anti Seepage Material for Shuibuya Project's Core Wall Rockfill Dam

针对水布垭宽级配防渗料，研究了反滤设计方法。通过反滤保土试验及冲刷自愈试验，给出了适合水布垭宽级配防渗料的反滤设计标准。在反滤保土试验中，提出了平抛风干细料的试验方法，较之谢纳德的浓泥浆试验更为方便快捷。水布垭心墙防渗料不仅级配宽而且变化大，几乎包容了可作防渗料的各种宽级配料。为此，研究成果Ｄ１５＝０．５～１ｍｍ（平均０．６ｍｍ），可作为一般宽级配防渗料的反滤设计准则。

Aiming at the problems of the Shuibuya Project's wide grading anti seepage material,the method of filter design is researched.Through the filter protective soil tests and fissure self healing tests,the filter design standard of the wide grading anti seepage materials of Shuibuya Project is given.In the filter protective soil test,the method on air dry fine grained material with horizontally throwing is proposed,which is more convenient and quick than that of Xie Nade's dense mud test.The Shuibuya Project's gradings are not only wide,but their change extends are large,almost involving various wide grading materials that can be used as anti seepage .So the particle size D 50 =0.5—1mm(average value 0.6mm)may be employed as the anti seepage design standard of wide grading anti seepage material.