Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation

Area of Science:

• Geotechnical Engineering
• Soil Mechanics
• Construction Materials

Background:

• Split grouting theory lacks comprehensive understanding for filling areas.
• Effective soil reinforcement techniques are crucial for infrastructure development.

Purpose of the Study:

• To investigate slurry diffusion, reinforcement mechanisms, and effects of split grouting in filling soil.
• To analyze the relationship between grouting vein characteristics and soil mechanical properties.

Main Methods:

• Designed and utilized a 3D simulated grouting test system.
• Conducted grouting model experiments and analyzed vein distribution.
• Performed uniaxial compression, dynamic contact, and permeability tests before and after grouting.

Main Results:

• Identified three grouting vein types: trunk, branch, and permeable.
• Observed significant improvements in soil properties post-grouting: 186% increase in compressive strength, 47-fold decrease in permeability, 45.3% increase in cohesion, and 44.9% increase in internal friction angle.
• Grouting vein network and soil compaction effectively strengthened the injected soil body.

Conclusions:

• Split grouting creates a multi-stage vein network that reinforces filling soil.
• The study provides significant guidance for understanding split grouting mechanisms and evaluating its effectiveness.