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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2005.9
- 수록면
- 3 - 15 (13page)
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This paper concentrates on one part of waste containment technology: the recompacted clay portion of a composite liner system. Mankind has used clay in controlling seepage of water for thousands of years. Today's clay liner must have a uniformly low hydraulic conductivity, typically 1x10-7 cm/sec. Achieving a material with this property requires close attention to three major factors which can be controlled in the field. These are (1) material selection, (2) water content at compaction, and (3) density.
Generally, the material must be a clay soil having a Liquid Limit of at least 30. Since liquids flow in the voids between soil grains, it is important to have the smallest possible voids. The dry density sets the average size of the voids. The distribution of the void sizes is the major factor, since individual voids much larger than the average conduct flow far more rapidly than smaller ones. The best distribution is achieved when the clay is compacted at a water content wet of the Line-of-Optimums. The old "Points-over-Optimum" specification can result in high hydraulic conductivity and should not be used. Case histories show that good clay liners results when these concepts are followed, but failures occur when any of them is disregarded.
Generally, the material must be a clay soil having a Liquid Limit of at least 30. Since liquids flow in the voids between soil grains, it is important to have the smallest possible voids. The dry density sets the average size of the voids. The distribution of the void sizes is the major factor, since individual voids much larger than the average conduct flow far more rapidly than smaller ones. The best distribution is achieved when the clay is compacted at a water content wet of the Line-of-Optimums. The old "Points-over-Optimum" specification can result in high hydraulic conductivity and should not be used. Case histories show that good clay liners results when these concepts are followed, but failures occur when any of them is disregarded.
목차
SYNOPSIS
1. GEOENVIRONMENTAL ENGINEERING
2. CLAY LINER CONCEPTS
3. FIELD EXPERIENCE
4. THE LINE.OF.OPTIMUMS
5. SPECIFICATIONS FOR ACHIEVING LOW HYDRAULIC CONDUCTIVITY
6. OTHER CONSIDERATIONS
SUMMARY
REFERENCES
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