Filter test 1

[AsbAli]

Hi,
I want to perform a filter-test without base material and just with suspension. I want to define a function of resistence against erosion. I need to know which parameters of Soil(Filter and Suspension) and Water is important for this test. Which parameters must be measured before and after this test.

For example I thought that temperature have to be constent during the tests, measuring Q and pressure are essential and I have to perform specific gravity test, Grain size distribution, ....

I appreciate helpful tips on literature and web sites, specialy about tests with suspensions and Kontakt erosion and suffossion.

Thanks

 

[dgillette]

I don't think I understand what is meant by a filter test without base material - internal stability of the filter itself? Can you clarify that?

Is this a filter for a dam? If so, avoid "reinventing the wheel." There are two papers by Sherard, Dunnigan, and Talbot in the June 1984 ASCE Jnl of Geotechnical Engrg. They will get you to a safe, workable filter design. The same thing appears in the USBR filter design manual if you get a copy from the 1980s or later.

 

[AsbAli]

Actually, this test is about Erosion and Suffosion of soil of a dike. I don’t want to design filter because the dike is already there (100 years old), I want to proof the erodibility of fine particles of the related soil.

Therefore it is necessary to test the soil of dike. those tries, which was accomplished by sherard or the others, are with 2 layers, a base and a filter layer. I want to perform this Test only with a layer and feed base materials as suspension into filter materials.

 

[dgillette]

Suffosion (internal instability) can be addressed by fairly simple means, using the shape of the grain-size curve, looking for gap grading or very flat grading. For example:

Sherard, J.L. (1979), "Sinkholes in Dams of Coarse, Broadly Graded Soils," Thirteenth Congress on Large Dams, Question 49,R,2, New Delhi.

I am not clear on what configuration you have in mind for your test. There is probably not an ASTM or BS standard for it. ;-)

 

[cvg]

do you mean "dispersion"?

 

[AsbAli]

Thank you for your time. (dgillette)
as mentioned above I want to perform a filter test not with filter/base combination but just with suspension. (cvg)

 

[dgillette]

By "suspension" you mean a suspension of particles in a fluid in place of the base soil? See Sherard, Dunnigan, and Talbot (1984), "Filters for Silts and Clays," ASCE JGG, June 1984, pp. 701 - 718. They were trying tests with the base soil mixed into a slurry; you might get some ideas from that. (By 1989, they abandoned that idea and went to pinhole filter tests.)