Model test study on the vertical bearing performance of post-grouted piles based on different grouting materials

Area of Science:

• Geotechnical Engineering
• Civil Engineering
• Materials Science

Background:

• Pile foundations are critical infrastructure components.
• Enhancing pile bearing performance is essential for structural integrity.
• Post-grouting is a proven technique for improving existing pile foundations.

Purpose of the Study:

• To evaluate the impact of different grouting materials on post-grouted pile performance.
• To investigate pile-soil interaction under various conditions.
• To understand the micro-mechanisms of different grouts.

Main Methods:

• Laboratory model tests of post-grouted piles.
• Simulated groundwater flow and long-term loading.
• Analysis of load-settlement curves and axial force transfer.
• Scanning electron microscopy (SEM) for material analysis.

Main Results:

• Post-grouting substantially increases pile bearing capacity.
• Cement-sodium silicate grout shows superior performance in flowing water.
• Fly ash-cement and geopolymer grouts improve soil through permeation.

Conclusions:

• Grouting effectively enhances pile-soil interaction and bearing capacity.
• Grouting material selection is crucial for optimal performance, especially under challenging conditions.
• Cement-sodium silicate offers rapid and dense solidification for immediate reinforcement.