Vented Cell Structure Frictional Interlock Earth Materials
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vented cell materials for soil confinement, such as Geoweb™, face challenges in maintaining frictional interlock under varying load conditions, leading to potential settlement and reduced long-term structural integrity, especially when loads are intermittent or dynamic, resulting in increased maintenance and repair costs.
Innovation Solution
A vented cell structure comprising polymeric strips with staggered bonding and strategically designed openings, including non-circular shapes like triangular and hexagonal openings, to enhance frictional interaction and interlock, ensuring communication between cells and maintaining engagement with fill materials even under low pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vented cell materials are used for soil confinement, then basic confinement function is provided, but frictional interlock is not maintained under varying load conditions leading to settlement and reduced structural integrity
Solution Approach 1:
The patent changes the surface friction parameter of the cell material by specifying strips with coefficient of friction greater than 0.60 under 30 psf normal stress, greater than 0.65 under 50 psf, and greater than 0.70 under 60 psf. This parameter change ensures the cell walls maintain adequate frictional interlock with fill materials under varying load conditions, preventing settlement and maintaining structural integrity.
2Ease of operation
If cell strips have low friction coefficient, then ease of installation is improved, but interlock with fill materials is lost under ambient and dynamic loads
Solution Approach 1:
The patent establishes specific friction coefficient parameters for the cell strips: greater than 0.60 under 30 psf, greater than 0.65 under 50 psf, and greater than 0.70 under 60 psf normal stress. These parameter specifications ensure adequate interlock with fill materials while allowing for practical installation procedures.
3Strength
If openings in cell walls are small, then structural strength is improved, but communication and interlock between adjacent cells is reduced
Solution Approach 1:
The patent applies local quality by specifying that openings be distributed in at least three different locations along each cell wall. This creates localized communication points that maintain structural integrity of the wall while ensuring adequate intercell communication and continuity of fill material throughout the cell structure.
Solution Approach 2:
The patent segments the cell wall openings into multiple discrete locations rather than one large opening or continuous slot. This segmentation maintains wall strength by preserving most of the wall material while providing multiple points for intercell communication and fill material continuity.
4Adaptability or versatility
If cell material does not maintain interlock under low pressure, then adaptability to different load conditions is improved, but settling occurs under intermittent loads
Solution Approach 1:
The patent changes the friction parameter to be load-adaptive by specifying progressively higher coefficients: greater than 0.60 under 30 psf, greater than 0.65 under 50 psf, and greater than 0.70 under 60 psf. This ensures the cell material maintains interlock across the full range of ambient and design load conditions, preventing settling under intermittent or dynamic loads.
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 enhanced vented cell structure achieves higher coefficients of friction and interaction, reducing long-term settling and maintenance needs by maintaining interlock under both ambient and design load conditions, thereby improving structural integrity and extending the lifespan of confinement systems like road bases.
Implementation Method 1
at least one of the strips having a coefficient of friction greater than 0.60 under a normal stress of 30 psf; at least one of the strips having a coefficient of friction greater than 0.65 under a normal stress of 50 psf; at least one of the strips having a coefficient of friction greater than 0.70 under a normal stress of 60 psf
Data Source
AI summary
A vented cell structure for confinement and interlock of earth materials comprising polymeric strips bonded together on their faces in a side by side relationship at bonding areas which are staggered from strip to strip such that the plurality of strips may be stretched in a direction perpendicular to the face of the strips to form a layer of cells. The strips form walls of the cells, and each of the cells has an open interior. At least some of the strips having openings through the strips providing communication with the open interior of the cells. The strips have improved coefficients of friction and interaction over the prior art. In some examples, at least one of the openings has an open area of greater than 804 mm2.