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Influence of biochar on the water permeability of compacted clay subjected to freezing-thawing cycles

100%

Chen Z. , Kamchoom V. , Leung A. K. , Xue J. , Chen R.

Acta Geophysica

2024

tom Vol. 72, no. 3

2071--2081

Seasonal variation of soil surface temperature, such as freezing and thawing, can induce increases in the water permeability in clay by mobilizing clay pore structure. This kind of weather-induced change in clay behavior may worsen the water-sealing performance during the construction and after closure operation of engineered structures such as soil barriers for tailings or man-made slopes. There is limited knowledge towards the influence of freezing-thawing cycles on clay microstructure and saturated permeability (Ksat). This study investigated the saturated permeability of clay under freezing-thawing cycles and explored the uses of biochar as eco-friendly amendment to manipulate the permeability of compacted clay. Clay specimens were compacted with different initial water contents (30%, 34%, and 38%). The biochar application rates of 0%, 2%, 4%, 8% (by dry weight) were applied to measure their effects on the permeability of clay specimens. Saturated permeability was measured by the falling head tests. Any variation of biochar amended clay microstructure after freezing-thawing cycles was captured by the scanning electron microscope. The Ksat was reduced by about one order of magnitude when the biochar application rate was larger than 4%. This may be attributed to the increase in the filling of the biochar particles in the clay intra-aggregate pores upon the transport of liquid water during the repeated freezing-thawing processes. The biochar may thus be recommended to minimize the Ksat of geo-environmental structures in cold regions when sufficiently large application rate was used to facilitate the pore-filling process.

Metodyka doboru gruntu w ramach projektowania mineralnych przesłon izolacyjnych składowisk odpadów

80%

Majer E.

Geologos

2007

tom Vol. 11

239--252

Artykuł podsumowuje wyniki badań wykonanych w laboratorium w ramach oceny przydatności gruntów do formowania przesłon mineralnych oraz rezultaty badań i obserwacji prowadzonych w czasie budowy uszczelnień na składowiskach odpadów. W ramach badań zbadano kształtowanie się w procesach budowlanych właściwości 6 różnowiekowych iłów. Badane iły w sensie mechaniki gruntów były rozumiane jako grunt antropogeniczny, nasypowy. W artykule przedstawiono związki między wybranymi parametrami gruntów, technologią budowy a jakością przesłon mineralnych zbudowanych z iłów.

The study summarizes the laboratory test results made for the assessment of soil utility for CCLs and the results of observations made during CCLs construction of some landfills. The changes of properties six types of clay during construction were investigated. All investigated clays were treated as man - made ground in according to soil mechanics. The study presents the correlations between determined properties of soils, technology of construction and the quality of CCLs.