Numerical Simulation Analysis on the Stress and Strain Behavior of Composite Geomembrane in Rigid Landfill

In order to investigate the stress characteristics of a composite geomembrane during the operation of a rigid landfill, a three-dimensional finite element model was developed for a specific rigid landfill project in Tongling China. This model takes into account the contact behavior between the composite geomembrane and concrete unit pool. It aims to calculate and analyze the distribution of stress and strain in both the composite geomembrane and rigid landfill under various working conditions, including empty and full storage. At the same time, the influence of the change of friction coefficient between the composite geomembrane and the concrete cell pool on the stress and strain of the geomembrane is analyzed under the condition of full reservoir. The results indicate that the stress and displacement distribution of the composite geomembrane and concrete structures in the landfill site remain reasonable and safe before and after transitioning from empty to full storage. Under critical conditions, specifically when the cell pool is fully loaded, significant tensile stress and strain occur at the top anchorage of the pool, the edge of the pool bottom, and the corners of the cell pool. The tensile stress in the concrete structure is notably higher at the junction between the side walls and the bottom floor of the cell pool, while compressive stress is more pronounced at the connection between the frame columns of the lower maintenance layer and the bottom floor of the cell pool. Increasing the friction between the composite geomembrane and the concrete cell pool can effectively mitigate stress concentration in the composite geomembrane, thereby enhancing the structural stability and safety.OPEN ACCESS Received: 14/03/2025 Accepted: 21/05/2025 Published: 22/09/2025