Study on Three-Dimensional Hydro‑Mechanical‑Chemical Fully Coupled Model for Pollutant Transport of Composite Liners

DOI: https://doi.org/10.62517/jiem.202503203

Author(s)

Yang Jinzhu

Affiliation(s)

Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing, China

Abstract

In complex construction environment, there are often holes in the composite gasket geomembrane, and it is easy to bend upward to form wrinkles. Holes and wrinkles are the key factors for pollutants to enter the underlying clay bedding, which will change its hydraulic and mechanical properties and dynamic coupling response. The three-dimensional multi-physical field fully coupled model which can describe the true state of geomembrane defects can accurately predict the migration law of pollutants inside the composite gasket, which is of great significance for the design and service performance evaluation of the composite gasket. Based on Biot consolidation theory and the mass conservation equation of pore fluid and pollutant, a three-dimensional hydro‑mechanical‑chemical (HMC) fully coupled pollutant transport model with membrane defects is established in this paper. The coupling model was numerically calculated using COMSOL Multiphysics software, and the coupling response laws of soil under two conditions with only holes and wrinkles were compared and analyzed. The results show that the existence of wrinkles can not only expand the pollutant leakage area, but also increase the negative pore water pressure and the depth of influence. Increasing the amount of soil settlement and rebound makes the pad appear uneven settlement; At the same time, it will greatly accelerate the migration rate of pollutants. Compared with the condition without wrinkle, the maximum negative pore water pressure and sedimentation amount in the initial stage increased by 80% and 50%, respectively, and the breakdown depth of pollutants increased by 97.6% when the simulation time was 50 years.

Keywords

Holes; Wrinkles; Three-dimensional Hydro‑mechanical‑chemical Fully Coupled Model; Composite Liners

References

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