Composite Geomembrane Core with Drainage Voids
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Solution Overview
Problem
Composite materials used in geotechnical engineering for landfill capping face challenges in maintaining stability under shearing forces and preventing slipping, particularly on sloping surfaces, due to insufficient frictional engagement with substrates, which is often addressed by adding expensive friction-enhancing layers.
Innovation Solution
A composite material design featuring a core sheet with drainage voids and openings that allow a cover sheet to extend through, enhancing frictional engagement with the substrate and reducing the need for additional friction-enhancing layers by utilizing the cover sheet to contact the substrate directly, thereby improving stability and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a friction-enhancing layer is added to the core, then frictional engagement with the substrate is improved, but manufacturing costs increase
Solution Approach 1:
The invention extracts the friction-enhancing function from a separate additional layer and integrates it into the cover sheet itself. The cover sheet is designed with a textured or roughened surface that provides frictional engagement with the substrate, eliminating the need for a separate friction-enhancing layer while maintaining the required strength and stability.
Solution Approach 2:
The cover sheet is designed to perform multiple functions: it provides protection, enables frictional engagement with the substrate through its textured surface, and maintains structural integrity. By combining these functions into a single component, the invention eliminates the need for separate friction-enhancing layers and reduces manufacturing costs.
2Stability of the object's composition
If the core material is made more extensive to improve stability, then frictional engagement is enhanced, but the amount of expensive core material increases
Solution Approach 1:
The invention extracts the stability function from the core material and transfers it to the cover sheet. The cover sheet's textured surface and direct contact with the substrate provide the necessary frictional engagement and stability, allowing the core material to be reduced while maintaining overall structural stability.
Solution Approach 2:
The invention uses a cost-effective cover sheet design that provides the necessary stability function without requiring extensive expensive core material. The cover sheet acts as a functional replacement that maintains stability under shearing forces while reducing material costs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite material effectively enhances frictional engagement between the composite and the substrate, maintaining stability under loading conditions while reducing the amount of expensive core material needed, thus addressing the issues of shearing forces and slipping without increasing costs.
Implementation Method 1
Moisture from the soil S passes through the textile 12 and then drains under gravity through the core 10
Implementation Method 2
the cover sheet extends in use through the core sheet... enabling the cover sheet to contact material adjacent to the second side of the core sheet, e.g. the substrate on which the second side of the core sheet rests, thereby enhancing frictional engagement between the composite material and such material
Data Source
AI summary
A composite material made up of fluid permeable layer and a core having drainage voids between projections thereon. The core has a number of relatively large openings defined therein so that in use the fluid permeable layer may extend through the openings in response to a working load applied thereto.