1.0.1 This code is formulated to reach the unified technical requirements for the design of the dredging and reclamation works, improve the survey and design quality and technical level for the works and promote the dredging and hydraulic fill technology progress.
1.0.2 This code is applicable to the design of dredging and reclamation for the port and waterway works and a reference for the design of similar works like dredging and covering and hydraulic fill for the artificial island, beach and revetment and the seabed pipe ditch.
1.0.3 Not only the requirements stipulated in this code, but also those in the current relevant ones of the nation shall be complied with for the design of dredging and reclamation works.
2 Terms
2.0.1 Dredging Works
An underwater earth-rock excavation operation mode carried out by machinery, hydraulic power and manpower.
2.0.2 Hydraulic Fill
An operation mode by which the sediment is sent to the designated place by the dredge pumps and dredge pipe.
2.0.3 Dredging Equipment
A general term for boat and auxiliary equipment used for dredging.
2.0.4 Disposal Site
A water area where the dredged material is disposed according to the design decision.
2.0.5 Bed Material
The undisturbed soil at the surface layer of the dredged water area bottom or the design bottom elevation.
2.0.6 Fluid Mud Layer
The flocculence mud layer, with specific density and rheological property, located between water mass and river or sea bottom.
2.0.7 Nautical Depth
The vertical distance from the local theoretical lowest tide level to the nautical mud unit weight interface. The nautical mud weight density refers to the maximum mud weight density at which the boat navigation and the safety of berthing and unberthing operation are ensured.
2.0.8 Trial Dredging
The trial dredging carried out to determine the parameters for the dredging of the dredged material, back silting, side slope and environmental impacts.
2.0.9 Production Rate of Dredgers
The earth volume dredged by the dredger in unit time.
2.0.10 Gradation of Soils for Dredging Purposes
The grade division carried out according to dredging difficulty degree of the dredged materials.
2.0.11 Maintenance Dredging
The bottom sediment dredging to maintain or recover the original dimension at a designated water area, divided into the perennial maintenance dredging and one-off maintenance dredging.
2.0.12 Hydraulic Filling Equipment
A general term for boat and auxiliary equipment used for hydraulic fill.
2.0.13 Booster Pump
A dredge pump set in the sludge pipe to increase the hydraulic transport distance of the pipeline.
2.0.14 Bulking Factor
Ratio of volume of the dredged or pretreated materials to the volume of its original shape.
2.0.15 Time Utilization Rate of Dredgers
A percentage of dredging time by the dredger in the total time of dredging time, productive and nonproductive down time.
2.0.16 Volumetric Density of Slurry
A percentage of natural soil volume in slurry volume.
2.0.17 Classification of Soils and Rocks to be Dredged
The classification of rock and soil according to the dredging industry characteristic and the physical and mechanical indexes.
2.0.18 Calculation Value of Over-depth
The depth added value counted in the quantities according to the dredging equipment construction accuracy to reach the design depth.
2.0.19 Calculation Value of Over-width
The width added value at single side counted in the quantities according to the dredging equipment construction accuracy to reach the design width.
2.0.20 Advanced Maintenance Dredging
The added depth determined in the design based on the back silting rule to ensure the navigable dimension within a given period.
2.0.21 Capital Dredging
The constructed, renovated or extended dredging.
2.0.22 Management of Dredged Material
The behaviour to dispose of the dredged materials.
3 Basic Requirements
3.0.1 In the dredging and reclamation works design, the comprehensive analysis shall be carried out from the dredging, hoisting, conveying, handling or using.
3.0.2 The same work shall be subjected to the technical and economical comparison between at least two schemes and the recommended scheme shall be proposed.
3.0.3 The dredged material shall be used depending on the works conditions and the dredged material, with pollutants beyond the standards, shall be handled and processed according to the national laws and regulations and the international covenants.
3.0.4 In the dredging and reclamation works design, the safety risk possible in the works
