Ground Improvement: Five Different Methods of Ground Improvement!
1. Concept Clarification: Ground Improvement is not Limited to High-Pressure Jet Grouting
- Ground improvement: high-pressure jet grouting (replacement method):
- Effective regional formation improvement
- Careful evaluation of water sealing effectiveness
- Water-stop curtain – comprehensive reduction of soil permeability depending on ground conditions – unsuitable
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2-1. Ground Improvement : High-Pressure Jet Grouting Method
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2-2. Ground Improvement : Shallow Ground Grouting Method (Depth ≤ 2m)
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2-3. Ground Improvement : Shallow Ground Grouting Method (Depth ≤ 5m)
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2-4. Ground Improvement : Single Tube Packer Grouting, Depth ≤ 5m
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2-5 Ground Improvement : Double-Packer Grouting Method
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2-6 Ground Improvement : Dual-Pipe Grouting Method
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2-7. Ground Improvement : Hot Bitumen Grouting Method Principle of Bitumen Grouting
Traditional grouting methods often face difficulties in effectively consolidating and sealing due to high water flow rates or other challenging factors, resulting in the loss or dilution of grout material.
The setting process of bitumen grout is primarily controlled by temperature.
When flowing water comes into contact with hot bitumen grout, the temperature of the grout decreases rapidly, causing its viscosity to increase quickly (bitumen viscosity is highly sensitive to temperature changes), leading to rapid solidification at the water contact zone.
The hot bitumen grouting technique is highly effective in sealing and addressing water inrush issues in cofferdams, seawalls, excavations, and tunnels. It provides excellent results in these applications.
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3-1. Objectives of Grouting
◆ Increasing Bearing Capacity. ◆ Increasing Shear Strength. ◆ Enhancing Consolidation.
◆ Preventing Soil Liquefaction. ◆ Sealing Water Infiltration. ◆ Preventing or Managing Hydraulic Pressure (Buoyancy) Damage.
◆ Treating mud spray. Reducing Porosity, Increasing Unit Weight, Lowering Water Content, Enhancing Cohesion, Increasing Lateral Stress on the Ground, Decreasing Permeability, Filling Voids
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3-2. Selection of Grouting Methods
◆ Assessing the project conditions to identify suitable grouting techniques.
◆ Choosing effective grouting methods from the available options that are suitable for the project.
◆ Selecting the most cost-effective technology and materials from the effective grouting methods.
◆ Evaluating whether the desired grouting objectives can be achieved within the allotted operation time.
◆ Seeking advice from professional entities to gather their expert opinions.
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