Solutions
Four solutions are summarized for different scenarios: defect treatment of hydropower engineering, defect treatment of high-speed rail transit engineering, defect treatment of water resource environment engineering, and defect treatment of new energy power generation engineering
Erosion and abrasion resistant solutions for hydraulic structures
- Defect manifestation:
Abrasion
Suspended load: Sediment abrades the surface of hydraulic concrete as it moves with high-velocity water flow.
Traction load: Generally moves along the bottom of the water flow. As the speed of movement increases, its movement becomes: sliding - rolling - jumping forward.
Cavitation
Cavitation: Cavitation mainly occurs due to unreasonable design of the water discharge structure's contour lines and poor surface finish during construction. High-velocity water flow creates negative pressure zones.
- Damage characteristics:
Characteristics of erosion damage by traction materials
Sliding friction, rolling friction, and jump impact;
Sliding friction-----leaves grooves and scratches on the concrete surface;
Rolling friction-----has both frictional damage and impact damage, and the form of expression may be potholes;
Characteristics of erosion damage by suspended materials
Sliding friction, without impact energy; the surface hardness, not the toughness, determines the abrasion resistance of hydraulic concrete, which is different from the impact of traction material pebbles on the concrete surface. The form of expression may be uniform peeling of the surface concrete or repair layer;
Characteristics of cavitation damage
Caused by high-speed water flow
Common occurrence locations: Reverse arc sections, energy dissipation surfaces, gate slots, etc.
- Basis for Scheme Selection:
Basic conditions: concrete foundation strength, existence of leakage, presence of scour damage, etc.
Water flow conditions: flow velocity, annual flow duration, flow frequency, sediment content, water flow aeration, etc.
Environmental factors: sunshine, temperature, humidity, corrosive media (such as seawater).
Economy: material cost, construction difficulty, maintenance cost.
Engineering requirements: durability, eco-friendliness, construction period.
- Technical Selection Basis:
Generally, integrated management is required, combining multiple technologies (such as high-performance concrete + surface coating + diversion structure), and the effectiveness of the scheme should be verified through hydraulic model tests. In actual projects, it is recommended to consult professional design units to customize the scheme according to the specific working conditions.
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