Biodegradable PLA Facing Element for Reinforced Soil Structures
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Solution Overview
Problem
Traditional reinforced soil structures using steel facing elements risk soil and groundwater pollution due to degradation and corrosion, and are restricted in environmentally sensitive areas, necessitating a biodegradable alternative to maintain environmental integrity and facilitate quicker, unskilled construction.
Innovation Solution
A reinforced soil structure featuring a facing element made from biodegradable natural or synthetic materials, such as polylactic acid (PLA) or fibre composite materials like WPC wood, which are rigid enough to maintain the structure's shape and avoid the use of steel, combined with a reinforcement element like a double twisted wire mesh or geogrid, and an anti-erosion component, allowing for easy assembly and installation by unskilled labor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel facing elements are used in reinforced soil structures, then structural strength and stability are improved, but soil and groundwater pollution occurs due to degradation and corrosion
Solution Approach 1:
The facing element material is changed from steel to biodegradable natural or synthetic materials, fundamentally altering the material parameter to eliminate corrosion and pollution while maintaining structural functionality through the composite soil-reinforcement system
Solution Approach 2:
The facing element is designed as a temporary component that performs its shaping and protective function during construction and early stabilization phases, then biodegrades naturally, replacing permanent steel elements with short-lived biodegradable materials that fulfill their purpose and then decompose without harm
2Adaptability or versatility
If steel facing elements are used, then environmental restrictions apply in sensitive areas, but alternative materials must maintain structural integrity
Solution Approach 1:
The structure uses a composite system combining biodegradable facing elements with geosynthetic reinforcements and compacted soil layers, where the composite action of multiple materials provides the necessary structural integrity that the biodegradable facing alone cannot achieve
3Ease of operation
If traditional steel mesh facing elements are used, then construction requires specialized equipment and staff, but biodegradable materials should enable simpler construction
Solution Approach 1:
The facing element is divided into modular panels that can be easily transported, handled, and assembled by unskilled workers, with each panel being a manageable unit that simplifies the construction process while maintaining overall structure quality through standardized design
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 biodegradable facing element reduces environmental pollution, allows for quicker construction with reduced labor needs, and maintains the structure's shape post-biodegradation, ensuring resistance continuity and strain transfer among elements without the need for steel clips, thus overcoming the limitations of traditional steel-based systems.
Implementation Method 1
a facing element made of a natural and biodegradable material
Data Source
AI summary
The invention is applicable in the field of retaining structures, known as "reinforced soil. More specifically, it refers to a facing element for reinforced soil structures and excavation faces and to a structure for reinforcing slope and excavation faces made with the facing element provided for in the present invention. The facing element for reinforced soil structures and excavation faces provided for in the present invention is made of a natural origin material, composite, biological or synthetic, for example a biopolymer such as polylactic acid 100 percent genuine (PLA) or polylactic acid bonded with other elements (composite PLA), composite with a fibre material containing cellulose, such as WPC wood, or natural wood.