Slope Protection Geotextile Engineering Case
Slope Protection Geotextile Engineering Case
Copper Mine Waste Dump Slope Ecological Restoration (High-Steep Acidic Slope)
Ⅰ. Slope Protection Geotextile Project Overview
Slope: 55°–60° in gradient, approximately 30m in height, with abundant loose rocks, developed gullies, and overall instability
Soil: Strongly acidic (pH 2.4–6.7, average 4.96), containing sulfide minerals and heavy metals, prone to generating acidic leachate
Remediation Goals: Pollution prevention and seepage control, slope stabilization, and vegetation restoration, to prevent acidic runoff from polluting nearby rivers
Ⅱ. Main Challenges
·Steep slope with loose boulders, prone to collapse;
·Highly acidic and rich in heavy metals, causing easy corrosion of conventional materials;
·No vegetation and poor water retention, making it susceptible to severe gully erosion by rainfall runoff.
Ⅲ. Geotextile Application Plan
Main Materials:
·Short-filament geotextile, 200g/㎡～300g/㎡ (for filtration, drainage, and separation to prevent clogging)
·Eco-friendly ecological restoration mat
·Granular GCL (Geosynthetic Clay Liner) impermeable layer
Layered Structure (from bottom to top):
·Slope surface leveling
·Installation of GCL impermeable layer (to prevent leaching of acidic water)
·Laying of geotextile (for separation, drainage, and prevention of soil particle loss)
·Application of nutrient layer (straw + vermiculite + compound fertilizer)
·Placement of ecological restoration mat + fixation using ecological logs
Supporting Measures:
·Masonry drainage ditch at the toe of the slope
·Longitudinal subsurface drainage pipes on the slope face (wrapped with geotextile)
Ⅳ. Construction Key Points
·Grade the slope to a uniform inclination and remove loose rocks and sharp protrusions;
·Fully lay the geotextile with an overlap of ≥30 cm, and secure it with U-shaped nails or ecological logs to prevent slippage;
·The geotextile surface must remain undamaged; any damage must be immediately repaired with patching;
·When applying the upper nutrient layer, avoid direct compaction of the geotextile by heavy machinery.
Ⅴ. Application Performance
·Impermeability: Acidic seepage is effectively blocked; heavy metal concentrations and pH levels in nearby rivers meet regulatory standards;
·Stability: No slope displacement or new gullies have occurred; erosion resistance has improved by over 80%;
·Ecology: Vegetation coverage reaches over 85% within 3 months, forming a stable vegetative layer;
·Durability: Performance remains stable to date (2026); the geotextile shows no significant aging or breakage.
