Document Type : Research Paper

Abstract

Selecting a proper envelope (filter) guarantees the performance of underground drainage systems. Mineral and granular envelopes (sand and gravel) have drawbacks such as distance of source from project, high cost, inappropriate gradation of envelope in relation to soil and environmental issues. The use of synthetic envelopes is an alternative, but needs further investigation. There are different types of synthetic envelopes and it is important to adapt the products with soil and regional conditions. The present study investigated the suitability of conventional synthetic envelopes for the Shadegan irrigation and drainage project in Khuzestan province. The permeameter tests compliant with standard ASTM D-5101 were carried out for three samples: an imported PLM synthetic envelope (PP450) and two samples produced by domestic Iranian factory (PP450, PP700). The hydraulic conductivity (HC) and gradient ratio (GR) of the soil-synthetic envelope combinations were determined. The results showed that average HC for the PP450, PP450 and PP700 were 0.21, 0.11 and 0.13 m/d, respectively; the average GR were 1.86, 0.78, and 0.84, respectively. The results suggest that the use of the Iranian PP450 and PP700 envelopes, which have similar functional abilities, is preferable, but PP700 showed less variation during testing.

Keywords

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