Permeable Traffic Bearing Structure with Open-Graded Aggregate Base
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional traffic bearing structures with non-permeable pavements lead to rapid stormwater runoff, causing flash floods and overwhelming wastewater treatment facilities, while permeable pavements require a strong and stable base to support traffic loads without being damaged.
Innovation Solution
A traffic bearing structure design featuring a subgrade, a single-lift base composed of compacted dual-purpose aggregate with specific particle size distribution for stability and permeability, and a permeable wear surface that allows water to infiltrate and reduce runoff.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If non-permeable pavement is used, then water resistance and structural strength are improved, but stormwater runoff increases causing flash floods and overwhelming wastewater treatment facilities
Solution Approach 1:
The patent employs permeable pavement made of porous concrete or porous asphalt as the wear surface, allowing stormwater to infiltrate through the pavement structure. The base layer uses open-graded aggregate with high void content (30-40%) to facilitate water percolation and storage, transforming the harmful runoff into a beneficial infiltration process that reduces peak flows and prevents flooding
2Object-generated harmful factors
If permeable pavement is used, then stormwater runoff is reduced, but the base must provide sufficient strength and stability to support traffic loads
Solution Approach 1:
The patent applies different aggregate gradations to different layers: the base layer uses open-graded aggregate with high void content for maximum permeability, while the subbase layer uses dense-graded aggregate with lower void content (15-25%) to provide structural strength and stability. This layered approach with varying local properties allows the system to simultaneously achieve high permeability in the base and sufficient load-bearing capacity in the subbase
Solution Approach 2:
The pavement structure combines multiple materials with complementary properties: permeable pavement (porous concrete or asphalt) for infiltration, open-graded aggregate base for water storage and high permeability, and dense-graded subbase for structural support. This composite material system allows each layer to optimize its specific function while collectively providing both permeability and strength
3Object-generated harmful factors
If multiple types of aggregate with different particle sizes are used in the base, then permeability is improved, but stability decreases
Solution Approach 1:
The patent uses open-graded aggregate in the base layer with larger particle sizes and high void content (30-40%) to maximize permeability, while employing dense-graded aggregate in the subbase layer with smaller particle sizes and lower void content (15-25%) to provide stability and interlocking. This spatial differentiation of aggregate properties allows each layer to optimize for its primary function
4Stability of the object's composition
If dense graded base is used, then stability is improved, but permeability decreases
Solution Approach 1:
The patent divides the supporting structure into two distinct segments: an open-graded base layer optimized for permeability and a dense-graded subbase layer optimized for stability. This segmentation allows each layer to independently fulfill its primary function without compromise, with the base providing water infiltration and storage while the subbase provides structural support
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 design effectively reduces stormwater runoff, supports higher traffic loads, and eliminates the need for holding ponds, allowing for more productive land use while maintaining structural integrity.
Implementation Method 1
permeable pavements are pavements which allow water to permeate through the pavement
Implementation Method 2
water that strikes and collects on the parking area tends to soak through the pavement and into the ground underneath
Implementation Method 3
The base includes aggregate compacted in a single lift
Data Source
AI summary
A traffic bearing structure with a permeable pavement includes a subgrade, a base positioned on top of the subgrade, and a wear surface positioned on top of the base. The base includes aggregate compacted in a single lift, where the aggregate in the base includes different sized particles mixed together. The wear surface includes a permeable pavement. The particle size distribution of the aggregate in the base is selected to provide adequate stability and permeability for the permeable pavement.