عربي English Français


Go back

Rehabilitation of Ancillary Structures of the Bou Heurtma Dam

, BARRAGE

Bouhertma


Rehabilitation of Ancillary Structures of the Bou Heurtma Dam


The Bou Heurtma Dam, operational since 1976, is located in northern Tunisia, approximately 20 km north of the city of Bou Salem. Its primary purpose is to retain the waters of the El Lil and Ghzela rivers to supply irrigation water to the agricultural lands in the Medjerda Valley. However, the dam's ancillary structures exhibit several defects requiring comprehensive rehabilitation.


Observed Anomalies

  1. Structural Damages:
    • Localized cracks in the concrete caused by abrasion from water carrying debris.
    • Sections with corroded reinforcement bars.
  2. Drainage System Issues:
    • Malfunction or obstruction in the drainage system at the dam base, leading to debris and stone accumulation.
  3. Surface Deterioration:
    • Superficial cracks in the mortar.
    • Signs of moisture and discoloration in the concrete.
    • Appearance of fine cracks (crazing) on the concrete surface.
  4. Joint Problems:
    • Cracks in joints, often filled but showing traces of calcite.
    • Fissured expansion joints.

Proposed Solutions


To ensure the durability and optimal performance of the structures, the following actions are recommended:

  1. Surface Preparation:
    • Clean the surfaces with high-pressure water jets to remove debris and deposits.
  2. Repair of Damaged Concrete:
    • Remove deteriorated concrete.
    • Apply bonding paint.
    • Use high-strength repair mortar for the affected areas.
    • Replace severely damaged concrete sections.
  3. Reinforcement Treatment:
    • Replace corroded reinforcement bars to maintain structural stability.
  4. Crack Management:
    • Inject appropriate materials to repair cracks.
    • Provide specialized treatment for cracked joints to ensure watertightness.

These rehabilitation works will restore the structural integrity of the ancillary structures and ensure their optimal functionality for managing the region's water resources.