Hydraulic conductivity and compressibility of mixtures of Nagoya clay with sand or bentonite

Abstract

In this study, a series of incremental loading oedometer tests and microscopic observations is carried out in order to investigate the influence of sand/bentonite fractions on hydraulic conductivity and compressibility. If sand particles do not form a skeletal structure, and each particle is independent in the clay matrix, an additive fraction of sand causes a decrease in the compressibility; however, it does not affect the hydraulic conductivity under the same consolidation pressure. The additive fraction of bentonite contributes to a decrease in the hydraulic conductivity, even for clayey materials. In addition, the relationship between the pore-size parameter, which represents the pore entrance size distribution, and the hydraulic conductivity is discussed using a probabilistic model known as the general capillary model.

Workability, compressibility and hydraulic conductivity of zeolite-amended clayey soil/calcium-bentonite backfills for slurry-trench cutoff walls

“…This method to determine hydraulic conductivity is accepted extensively (Sivapullaiah et al, 2000;Chai et al, 2004;Horpibulsuk et al, 2007;Yong et al, 2009;Watabe et al, 2011;Fan et al, 2014b), and therefore it is used in this study for relative comparison of hydraulic conductivity of various zeolite-amended clayey soil/Ca-bentonite backfills.…”

Hydraulic conductivity and compressibility characteristics of bentonite enriched soils as a barrier material for landfills

“…This structural arrangement can resist the effective vertical compressive stress in a better way as compared to Fig. 3 Flexible wall permeameter and consolidometer for consolidation and hydraulic conductivity tests the condition of sand particles that exists in a clay matrix with a higher bentonite content [35].…”

Experimental simulation and mathematical modelling of clogging in stone column

“…In this regard, different clay fractions were used to make several cylindrical samples and pre-loaded before conducting falling head permeability tests and compression tests to determine the relevant permeability and compressibility properties. These properties were then compared to previous data (Simpson and Evans 2016;Watabe et al 2011) as shown in Figure 8. The current test results agree well with previous data.…”