Effect of gravel on hydraulic conductivity of compacted soil liners

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Journal of Geotechnical Engineering; (United States)

DOI:https://doi.org/10.1061/(ASCE)0733-9410(1993)119:1(54)· OSTI ID:6366716

Shelley, T L ^[1]; Daniel, D E ^[2]

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1. Woodward-Cycle Consultants, Denver, CO (United States)
2. Univ. of Texas, Austin (United States)

How much gravel should be allowed in low-hydraulic-conductivity, compacted soil liners To address this question, two clayey soils are uniformly mixed with varying percentages of gravel that, by itself, has a hydraulic conductivity of 170 cm/s. Soil/gravel mixtures are compacted and then permeated. Hydraulic conductivity of the compacted gravel/soil mixtures is less than 1 [times] 10[sup [minus]7] cm/s for gravel contents as high as 50-60%. For gravel contents [le] 60%, gravel content is not important: all test specimens have a low hydraulic conductivity. For gravel contents > 50-60%, the clayey soils does not fill voids between gravel particles, and high hydraulic conductivity results. The water content of the nongravel fraction is found to be a useful indicator of proper moisture conditions during compaction. From these experiments in which molding water content and compactive energy are carefully controlled, and gravel is uniformly mixed with the soil, it is concluded that the maximum allowable gravel content is approximately 50%.

• OSTI ID: 6366716
• Journal Information: Journal of Geotechnical Engineering; (United States), Journal Name: Journal of Geotechnical Engineering; (United States) Vol. 119:1; ISSN JGENDZ; ISSN 0733-9410
• Country of Publication: United States
• Language: English

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