Cellular Confinement System Flaps for Low Pressure Friction
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Solution Overview
Problem
Current cellular confinement systems (CCSs) experience poor friction with geotechnical reinforced materials (GRMs) at low normal pressures, leading to deformation and loss of structural integrity, especially in shallow GRMs and sloped applications where normal stress is low or zero, resulting in erosion and disintegration of the composite system.
Innovation Solution
The introduction of flaps in the CCS walls that are designed to protrude and rotate, forming incisions which enable better anchoring and interlocking with GRMs, increasing friction and resistance to deformation, especially under low normal pressure conditions, by being triggered by pressure gradients during GRM compaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If CCS walls are made from rigid HDPE material, then dimensional stability and creep resistance are improved, but friction with GRM at low normal pressure deteriorates
Solution Approach 1:
The CCS wall is segmented into multiple flaps that can move independently relative to each other. Each flap is connected to the wall through a hinge mechanism, allowing them to protrude and rotate to engage with GRM particles, thereby increasing friction without compromising the overall dimensional stability of the rigid HDPE structure.
Solution Approach 2:
The flaps are designed to be dynamic elements that can rotate and move in response to normal pressure variations. At low normal pressure, flaps protrude and rotate to interlock with GRM, maximizing friction. The system transitions from a static rigid wall to a dynamic structure that adapts to loading conditions.
2Reliability
If flaps are added to increase friction with GRM, then frictional forces are improved, but device complexity increases
Solution Approach 1:
The flaps are formed as thin, flexible portions of the HDPE material itself, rather than separate complex components. This allows the flaps to bend and rotate easily to engage with GRM particles, providing high friction with minimal structural complexity. The flaps are created through incisions in the wall material, forming hinged portions that can move freely.
Solution Approach 2:
The flaps are designed to be self-actuating, automatically protruding and rotating in response to normal pressure applied by GRM. No external actuators, motors, or control systems are required - the flaps respond passively to loading conditions, maximizing friction when needed while adding minimal complexity.
3Strength
If flaps protrude to interlock with GRM, then resistance to deformation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The flaps are designed with specific geometric parameters (width, height, hinge location) that optimize their performance. By adjusting these parameters, the flaps achieve sufficient protrusion and rotation capability to interlock with GRM particles, providing high resistance to deformation. The geometry is designed to be manufacturable with standard tolerances while achieving the desired mechanical performance.
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 solution significantly enhances the frictional forces between CCS and GRM, reducing relative displacement and deformation, thereby improving the structural integrity and stability of the composite system, even under low normal pressure conditions, and resisting movement in multiple directions.
Implementation Method 1
triggered by pressure gradients during GRM compaction
Implementation Method 2
enhances the frictional forces between CCS and GRM
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4B
AI summary
The present invention discloses cellular confinement systems (CCSs) with improved friction with infill at low normal pressure. The invention especially presents novel flaps-containing CCS that includes inter alia a plurality of elongated strips arranged in a side by side pattern, each of the strip is segmentally bonded to an adjacent strip in spaced-apart bonding areas, said bonding areas alternating between the sides of each of said strips, such that when the system is stretched across its width, the strips curl to form a web of cells confined by cell walls disposed between the bonding areas, wherein at least one of the cell walls comprises at least one flap hinged to the wall and friction between the walls and the infill material increases.