Modeling fully coupled hydraulic-mechanical-chemical processes in a natural clay liner under mechanical and chemico-osmotic consolidation

Zhang, Zhihong; Masum, Shakil; Thomas, Hywel Rhys; Han, Lin

doi:10.1007/s11356-018-3532-7

Cited by 10 publications

(30 citation statements)

References 27 publications

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“…The chemical consolidation problem considering the influence of chemical factors involves many aspects of the chemo-hydro-mechanical (C-H-M) interaction. 9 Therefore, it is necessary to understand the chemical aspects of CCL consolidation to provide a theoretical reference for the optimization design and safety performance evaluation of the clay barrier of the MWL. Greenberg et al 10 considered the chemical and mechanical processes in a clay aquitard separating two sand aquifers to study the coupled flow of chemicals and water.…”

Section: Introductionmentioning

confidence: 99%

Analytical solutions of 1‐D chemo‐hydro‐mechanical coupled model of saturated soil considering osmotic efficiency

Zheng

2021

Num Anal Meth Geomechanics

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In the complex chemical environment of municipal waste landfills, the chemo-hydro-mechanical coupled flows in the compacted clay layer (CCL) and its deformation are very complicated. When studying the chemo-hydromechanical consolidation of soil, the osmotic flow, ultrafiltration, and the osmosis effect on solute migration were neglected due to the low osmotic efficiency. However, the permeability of CCL of landfill is very small, and their osmotic efficiency is higher. The osmotic phenomenon and influence of osmotic efficiency must be considered. In this paper, a 1-D chemo-hydro-mechanical coupled model of saturated soil is proposed considering osmotic efficiency. The analytical solutions of the model under specific boundary conditions were obtained by Fourier transform. The degradation model is compared with the existing governing equations and results in the literature, and the correctness of the proposed governing equations and analytical solutions is verified. Through the analysis of specific case, it can be concluded that chemo-osmotic consolidation significantly affects the consolidation of the soil layers. The osmotic consolidation leads to the generation of negative pore pressure, but it decreases with the decrease of the osmotic pressure gradient. This process leads to the rebound effect of the soil settlement. The osmotic efficiency significantly affects the consolidation characteristics of this soil layer, and therefore the effect of osmotic efficiency must be considered in soils with high osmotic efficiency.

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Section: Introductionmentioning

confidence: 99%

Analytical solutions of 1‐D chemo‐hydro‐mechanical coupled model of saturated soil considering osmotic efficiency

Zheng

2021

Num Anal Meth Geomechanics

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“…Q[ %K p "xOW ?PH C_re Q=Okt %q a """ =yxOv}q; p=kDv= |WywSB |=yOQm}wQ Q@ |QwQt &xD}U}DUq= pwOt %E &uwU;wB ?} Q[ % &|Owta |=DU= Q QO pmWQ}}eD %w z [87] %CWwv = Q 57 |x]@= Q u=wD|t [17] 'OvqOQi w Qw@Q=@ |x]@= Q x@ xHwD =@ d" = m d = m RT dc = m c dc (57) = Q 58 |x]@= Q u=wD|t R}v '|WQ@ VvD R= Q_vhQY =@ w =ywQ}v pO=aD T=U= Q@ [87] %CWwv…”

mentioning

confidence: 99%

“…|= Q@ = Q 59 |x]@= Q u=wD|t 58 |x]@= Q QO 57 w 56 '53 '52 \@=wQ |Q=Po}=H =@ [87] %CWwv l=N pmWQ}}eD [87] %CWwv u=wD|t 'p=}U |r=oJ uOw@ C@=F ZQi w |oDUw}B uwv=k T=U= Q@ @n @t = r (nV f ) [87]…”

mentioning

confidence: 99%

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مروری بر رویکردهای پژوهشی انتقال آلاینده‌ها در رس‌های اشباع تغییر شکل‌پذیر تحت اثر فرآیندهای همبسته‌ی هیدرولیکی - شیمیایی - مکانیکی

صادقی¹,

آذر²

2021

مهندسی مکانیک شریف

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Influence of coupling effect in the chemo‐hydro‐mechanical consolidation of saturated soil layer

Zheng

2022

Num Anal Meth Geomechanics

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In geological sites containing chemical pollutants, the clay buffer layer (CBL) is frequently utilized to isolate the pollutants from the external environment. Moreover, hydraulics, mechanics, and chemistry jointly pose impacts on the consolidation of CBL and the diffusion of chemical substances. In order to consider the coupled effect (termed chemo-hydro-mechanical-CHM), a one-dimensional consolidation model that fully considers CHM coupling (such as convection, ultrafiltration, and osmotic efficiency) is established. In the developed model, the excess pore pressure, chemical concentration, and soil settlement during the consolidation process are calculated via finite Fourier transform and inverse transform. Finally, the CHM coupling effect on consolidation under different conditions is analyzed and discussed. The results indicated that the coupling effect slowed down the entry of chemical substances into the soil layer so that the excess pore pressure dissipated faster, and the negative pore pressure was larger. Furthermore, the coupling effect increased the maximum settlement during consolidation but did not change the final settlement. The coupling effect prolonged the time of consolidation. In addition, the higher the osmotic efficiency, the greater the coupling effect, but the osmotic efficiency did not affect the time of consolidation.

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Modeling fully coupled hydraulic-mechanical-chemical processes in a natural clay liner under mechanical and chemico-osmotic consolidation

Cited by 10 publications

References 27 publications

Analytical solutions of 1‐D chemo‐hydro‐mechanical coupled model of saturated soil considering osmotic efficiency

Analytical solutions of 1‐D chemo‐hydro‐mechanical coupled model of saturated soil considering osmotic efficiency

مروری بر رویکردهای پژوهشی انتقال آلاینده‌ها در رس‌های اشباع تغییر شکل‌پذیر تحت اثر فرآیندهای همبسته‌ی هیدرولیکی - شیمیایی - مکانیکی

Influence of coupling effect in the chemo‐hydro‐mechanical consolidation of saturated soil layer

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