Ecological Restoration of Open‑pit Mine Dump Slope (Erosion control cellular confinement systems)

Ecological Restoration of Open‑pit Mine Dump Slope (Erosion control cellular confinement systems)

1. Project Overview

The project targets slopes of an open‑pit mine waste dump. The slope substrate consists of mine spoil with partial acid soil properties. Concentrated rainfall brings high risk of soil and water loss. Project objectives include anti‑scour slope stability and mine‑site revegetation, with no heavy‑duty traffic requirements.

2. Engineering Pain Points

Loose mine spoil on dump slopes is prone to gully erosion and slope slippage under rainfall. Given acidic site soil, construction materials shall resist acid‑alkali corrosion. Conventional mortar‑stone revetment comes with high cost and hardly supports vegetation restoration.

3. Selected CCS Specification

Perforated HDPE cellular confinement system; height: 100 mm; sheet thickness: 1.3 mm; weld spacing: 445 mm, perforated type.

4. Key Construction Points

Trim loose dump slope, remove large sharp rock fragments, and lay non‑woven geotextile;

Unfold perforated CCS from slope crest downwards, fully tension the panels and secure with anchor stakes;

Backfill amended and neutralized planting soil into cell cavities; hydro‑seed mixed shrub and herb seeds;

Build drainage ditches at slope toe to intercept concentrated slope runoff.

5. Project Outcomes

✅ Significantly mitigates soil loss caused by rainfall erosion and guarantees overall slope stability;

✅ HDPE material provides good resistance against mine‑site acid‑alkali corrosion and ageing;

✅ Realizes revegetation on mine slope with vegetation coverage exceeding 80%;

✅ Partial on‑site reuse of mine spoil is feasible, cutting fill‑material transportation costs.