...Zhangqi Xia; Jianfeng Wang; Zhiren Zhu; Wei Hu; Saoirse Tracy; Budi Zhao Fines removal during internal erosion results in the permeability increase and strength reduction of granular soils. This study examines internal erosion during shearing of granular soils under triaxial loading conditions...

... involving fractured limestone rock samples, showing that precipitated calcium carbonate (CaCO₃) reduced permeability reduction and caused pore clogging. By cross-referencing microfluidic findings with outcomes of macro-scale experiments, the study demonstrates the consistency of size-scale...

... overlain by a coarse layer. A coaxial permeameter cell enabled the local permeability to be obtained using spatial time domain reflectometry. Three methods (coefficient of variation, Dykstra–Parsons coefficient, and Lorenz coefficient) were employed to quantify heterogeneity based on spatial variability...

.... Permeability reduction exhibited a power-law relationship with the precipitation area fraction. In the two-phase staged injection method, elevated urease concentrations fostered more regularly shaped crystals. Higher calcium ion concentrations could inhibit ureolysis rate, reducing precipitates. Higher urease...

... their compression and hydraulic behaviours remains unclear, especially when high effective stress is involved, and the underlying micromechanism is yet to be revealed. This study investigated the compression and permeability of diatomaceous soils prepared by mixing pure diatom and kaolin powders through one...

... development in landfills. The reduction of foam on the relative gas permeability and the variation of the intrinsic permeability with degradation degree are considered. The source terms in the governing equations of two-phase flow and solute transport are chosen from the biodegradation process of MSW. Both...

... and consequent degradation during injection that has a significant impact on the aperture of localised gas pathways (fissures) and increases intrinsic permeability during the gas pressure dissipation stage. The analyses with complementary techniques (mercury intrusion porosimetry, field-emission scanning...

... in enhancing the strength and reducing the permeability of soil than the other two treatments, especially for soil with small grain sizes. This can be explained by the difference in the precipitation pattern of calcium carbonate using various urea hydrolysis media. 27 05 2021 03 03 2022 © 2022...

... and hydraulic engineering. In this paper, two types of mathematical models are proposed that consider different packing methods for porosity and permeability – namely, the filling model (FM) and the replacement model (RM). On this basis, incomplete coverage (overlap between large and small grains during...

... soil samples created using refractive image matching and monitored by particle image velocimetry (PIV). Three-dimensional pore topology is extracted from a series of two-dimensional images and imported into computational fluid dynamics (CFD) simulations. Permeability is estimated by three distinct...

... of slopes, embankment dams, dykes and other earthen structures, and is responsible for about 54% of dam failures and 14% of dyke failures (Foster et al., 2000 ; Danka & Zhang, 2015). dams erosion permeability seepage shear strength waves & wave loading The main...

... are considered as possible sealing materials on their own or in combination with other materials due to their high swelling characteristics, low permeability and radionuclides retention capacity (Pusch, 1982 ; Yong et al., 1986). Because of the ease of controlling their initial properties, the sealing...

.... The unsaturated permeability coefficient of the foam was about an order of magnitude lower than that of the gas. Owing to the low permeability of waste to foam and continuous gas generation, high gas pressures are easily developed in wet landfills. laboratory tests landfills landslides permeability pore...

...–foam mixture) that can be expected in the excavation chamber of an earth pressure balance (EPB) shield. It appears that a higher effective foam expansion ratio (FER_m) is more effective to form a low-permeability layer in the sand. Since there will be an interaction between air, water...

... into the pores of the sand); water flow with reduced permeability; water flow with increased permeability; and a residual stage. It appears that the infiltration depth of foam into sand decreases with increasing foam expansion ratio (FER) of the foam until a limit FER (approximately 15 for the foaming agent...

... of the mechanical and hydraulic properties of the improved ground, but very little is known about metakaolin–soil mixtures. For instance, shrinkage during curing is a significant issue for metakaolin-based concretes but has not been previously studied in soilcretes. In this work the permeability and strength...

... fluids. This paper presents the results of an experimental study to investigate the permeation characteristics of polymer fluids in coarse soils at the macroscopic level. To this end, constant-head permeability tests were carried out using three gradings of sand and partially hydrolysed polyacrylamide...

... microscopy permeability radioactive waste disposal water flow Despite significant efforts in the last few decades, developing a sound theoretical description of the hydraulic properties of compacted highly swelling clays such as smectite-rich clays has remained a challenge. Experimental...

...Viet Nguyen; Jubert Andrés Pineda; Enrique Romero; Daichao Sheng This paper describes an experimental study aimed at evaluating the influence of soil microstructure on air permeability in compacted clay. Air permeability measurements, estimated using the gas pressure decay method, were carried out...

...Haijun Zhou; Yingguang Fang; Minghua Chen; Renguo Gu; Wei Li Existing electro-osmotic calculation models are mostly based on the assumption of a porous medium with uniform pores, whereas natural soil has pores of different sizes. This is especially significant in the case of low-permeability soil...