Chemical Polymer Soil Stabilization Columns
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Solution Overview
Problem
Conventional soil stabilization methods are costly, time-consuming, and environmentally hazardous, particularly those involving cement or stone aggregates, which have a high carbon footprint and are difficult to source, making them unsuitable for improving weak and loose soil conditions effectively.
Innovation Solution
The method involves using a rotary mixing shaft and chemical polymers, such as liquid acrylic or vinyl acetate, to create soil stabilization columns by determining a dilution rate based on soil characteristics and injecting the polymer into the soil to form stiff columns that increase compressive strength and stiffness without the need for cementitious grout or aggregates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional methods using cement or stone aggregates are used for soil stabilization, then soil strength is improved, but environmental harm and cost increase due to high carbon footprint and difficulty in sourcing materials
Solution Approach 1:
The invention changes the chemical composition parameter of the stabilization material from traditional cementitious grout to chemical polymers (acrylic or vinyl acetate base). This substitution maintains the soil stabilization function while eliminating the high carbon footprint associated with cement production and reducing environmental harm.
Solution Approach 2:
The invention uses chemical polymers that are readily available and cost-effective compared to cement or stone aggregates. The polymer-based stabilization columns provide the necessary strength improvement without the sourcing difficulties and high costs associated with traditional materials.
2Strength
If conventional methods using cement or stone aggregates are used for soil stabilization, then soil strength is improved, but time and cost increase due to difficulty in sourcing materials
Solution Approach 1:
Chemical polymers (acrylic or vinyl acetate base) are widely available commodities that can be sourced immediately without the delays associated with quarrying and transporting stone aggregates. This eliminates material sourcing delays and reduces project timeline.
Solution Approach 2:
The chemical polymer system serves multiple functions: it stabilizes soil, provides structural support for columns, and can be applied to various soil types. This universal applicability eliminates the need for material-specific sourcing and processing time.
3Stability of the object's composition
If chemical polymer is added to container first then water, then polymer mixes with water, but excess foam is formed
Solution Approach 1:
The invention inverts the conventional mixing sequence by adding water to the container first, then adding the chemical polymer. This reverse sequence prevents excessive foam formation during mixing while ensuring complete dissolution and homogeneous distribution of the polymer in the water.
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 approach provides a cost-effective, environmentally friendly, and efficient method to improve soil strength, reducing compressibility and enhancing load-bearing capacity, suitable for supporting structures with minimal environmental impact and resource requirements.
Implementation Method 1
a dilution rate of the chemical polymer is determined based on at least one of: a moisture content of the soil at a selected soil location, a particle size distribution of the soil at the selected soil location, a shear strength of the soil at the selected soil location, a target strength of the soil stabilization column, and a target stiffness of the soil stabilization column. The chemical polymer is then diluted based on the determined dilution rate.
Implementation Method 2
The soil at the selected soil location is loosened by rotating the rotary mixing shaft in a first direction until it reaches a predetermined depth in the soil, and the diluted chemical polymer is mixed directly with in-situ soil at the selected soil location
Implementation Method 3
The rotary mixing shaft is then withdrawn from the selected soil location by rotating the rotary mixing shaft in a second direction once the rotary mixing shaft reaches the predetermined depth in the soil. rotation in the second direction further mixes the soil as the rotary mixing shaft is withdrawn
Implementation Method 4
A surface of the sand-based soil is penetrated with the vibrating device at the selected soil location via induced vibration until the vibration device reaches a predetermined depth in the sand-based soil, thereby creating a void around the vibrating device in the sand-based soil
Implementation Method 5
A distal end of the vibrating device is lowered to contact the polymer-sand mixture to densify the mixture
Data Source
AI summary
Methods for installing soil and sand stabilization columns using a chemical polymer are provided. The chemical polymer can be a liquid acrylic base chemical polymer or a liquid vinyl acetate base chemical polymer. In the methods, a dilution rate of a chemical polymer is determined based on at least one of: a moisture content of the soil at a selected soil location, a particle size distribution of the soil at the selected soil location, a shear strength of the soil at the selected soil location, a target strength of the soil stabilization column, and a target stiffness of the soil stabilization column. The chemical polymer is then diluted based on the determined dilution rate. The diluted chemical polymer is inserted into a selected soil location and mixed with in-situ soil or with sand to form a stabilization column.