Ground Stabilization via Salt Injection and Expanding Resin
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Solution Overview
Problem
Current methods for stabilizing cohesive, argillaceous foundation ground are inefficient in maintaining long-term effects, are costly, and struggle to achieve targeted, distributed, and confined stabilization within the foundation volume, particularly due to high ion exchange requirements and continuous water introduction.
Innovation Solution
A method involving injections of salt solutions and expanding resin into the ground to 'paralyze' expanding clays through ion exchange, combined with temporary electrokinesis to facilitate ion migration, and subsequent injections of expanding resin to consolidate the ground, optimizing ion exchange and water flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electro-kinetic processes are used to stabilize expanding clays, then ion migration and stabilization effects are improved, but installation complexity and maintenance costs increase due to fixed electrode installations
Solution Approach 1:
The patent uses portable, temporary electrode installations that can be easily deployed and removed, replacing fixed, complex electrode systems. The electrodes are simple conductive elements that can be inserted into the ground, used for a predetermined period to achieve ion migration, and then removed without requiring permanent infrastructure.
Solution Approach 2:
The patent replaces complex fixed mechanical electrode installations with a simplified system using portable electrodes connected to a power source. The system uses electrical fields to drive ion migration through the clay, substituting mechanical anchoring and permanent installation with temporary electrical contact.
2Reliability
If high concentrations of salts are injected to achieve ion exchange, then stabilization effectiveness is improved, but treatment costs increase
Solution Approach 1:
The patent applies periodic electrical fields using temporary electrode installations that are activated for predetermined periods. The electrical stimulation is applied in cycles, allowing ion migration to occur during active periods and diffusion to continue during inactive periods, achieving effective stabilization without continuous high-concentration salt injection.
Solution Approach 2:
The patent changes the electrical parameters (voltage, current, duration) of the electrode installation to optimize ion migration efficiency. By adjusting these parameters, the system achieves effective ion exchange with reduced salt solution requirements, lowering treatment costs while maintaining stabilization effectiveness.
3Reliability
If continuous water introduction is used to maintain electro-osmotic flow, then ground stabilization is improved, but operational costs increase
Solution Approach 1:
The patent uses temporary, disposable electrode installations that do not require continuous water introduction. The electrodes are inserted, activated for a predetermined period to achieve the necessary electro-osmotic flow and ion migration, then removed. This eliminates the need for permanent infrastructure and continuous water supply systems.
Solution Approach 2:
The patent allows the ground stabilization process to proceed using the existing water content in the clay without requiring continuous external water introduction. The electro-osmotic flow utilizes the moisture already present in the expanding clays, and the temporary electrical stimulation is sufficient to achieve ion migration and stabilization without ongoing water supply.
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
This method effectively stabilizes the foundation ground by forming stronger bonds within the clay particles, reducing volume expansion, and improving load-bearing capacity with lower operational costs and more targeted treatment within the foundation volume.
Implementation Method 1
Electro-migration triggers the transport of the ions through the ground which is subjected to an electrical field with direct current as a result of a suitable electrode installation
Implementation Method 2
electro-osmosis processes are defined. The processes are based on the constant rehydration of the ground with pairing during the introduction of an electric current into the ground to be stabilized
Implementation Method 3
The speed and the direction of migration depend on the charge thereof (positive or negative) and is naturally also influenced by the electro-osmotic flow. The whole of the flow of the ions reduces with the reduction of the concentration of the species present in accordance with the theories of molecular diffusion
Data Source
AI summary
Consolidation and stabilization method for cohesive, argillaceous foundation ground or generally for a building site, comprising carrying out one or more injections of a solution of one or more salts in the ground and carrying out one or more injections of expanding resin in the ground.