Polyvinyl acetate-based soil stabilization for rock slope ecological restoration

Area of Science:

• Geotechnical Engineering
• Environmental Science
• Ecological Restoration

Background:

• External-soil spray seeding (ESSS) is common for ecological restoration of bare rock slopes.
• Direct ESSS often results in soil erosion and poor plant survival rates.

Purpose of the Study:

• To investigate the efficacy of combining ESSS with polyvinyl acetate (PVA) based soil stabilization.
• To assess the impact of PVA on soil mechanical properties, water stability, erosion resistance, water retention, and plant growth for rock slope restoration.

Main Methods:

• Experimental testing of PVA-stabilized soil properties.
• Evaluation of mechanical properties, water stability, erosion resistance, water retention, and plant growth.
• Analysis of PVA content and curing time effects on soil stabilization.

Main Results:

• PVA stabilization significantly improved soil cohesion (up to 50%) and internal friction angle (3.5°).
• Optimal PVA content of 3% maximized water stability, erosion resistance (up to 83% reduction), water retention, and plant growth.
• A curing time of over 3 days was necessary for beneficial PVA effects; shorter times decreased strength with increased PVA.

Conclusions:

• The combined ESSS and PVA stabilization method shows promise for ecological restoration of bare rock slopes.
• PVA effectively enhances soil properties, mitigating erosion and improving conditions for plant establishment.
• Optimizing PVA content and curing time is crucial for successful application.