Subgrade engineering should have sufficient J- construction strength, stability, deformation resistance and durability, and comprehensive design should be carried out from the aspects of subgrade filler selection and compaction, strength and stability, protection and reinforcement, drainage system, and treatment of key parts.
Subgrade design advocates actively and cautiously applying new technologies, new structures, new materials and new processes in combination with local conditions, and summing up experience, constantly improving and gradually popularizing.
The belt structure constructed by subgrade according to the route position and certain technical requirements is the foundation of pavement and bears the traffic load from pavement.
Ordinary subgrade
Refers to the subgrade with small fill height and excavation depth under good geological and hydrological conditions.
Special subgrade
It is located in special soil (rock) section, bad geological section or subgrade strongly influenced by natural factors such as water and climate.
General subgrade:
Subgrade design should be coordinated with the natural environment and urban landscape along the road, and fully consider the geological and hydrological characteristics along the road, effectively use the original terrain, try to achieve a balance between filling and excavation, and avoid high filling and deep excavation.
The selection and abandonment of subgrade earthwork should be combined with the local urban planning, and the factors such as soil type, earthwork volume, land use and traffic conditions should be comprehensively considered, and the location of selection and abandonment should be reasonably selected.
Subgrade design should be adapted to local conditions and make rational use of local materials, industrial waste and construction waste. Domestic garbage shall not be used for subgrade filling.
Subgrade design should fully consider various unfavorable factors in road operation, reduce variability and ensure durability.
Special subgrade:
Including special soil (rock) subgrade, poor geological subgrade and subgrade under special conditions. When the line passes through a special section, a comprehensive geological survey should be conducted to find out the nature, genetic type, scale, stability and development trend of the special geological body; Physical and mechanical parameters required for special subgrade design should be determined by in-situ test data combined with indoor test data.
The design of special subgrade should consider the influence of geological and environmental factors on subgrade and the development and change law of these factors. The treatment of subgrade diseases should follow the principles of giving priority to prevention, combining prevention with control, and striving for radical cure. Through comprehensive technical and economic comparison, reasonable treatment scheme and effective engineering measures are adopted according to local conditions. If the rectification is carried out in stages, it should be ensured that the safety of subgrade will not be reduced during the change of various factors.
Comprehensive design should be carried out for sites with various special soils (rocks) or special geological conditions.
About the industry standards and enterprise qualifications of building municipal engineering, you can log in to the column of Construction Network.
For more exclusive information about the construction industry, please pay attention to the micro-signal of the construction network in real time.
For more information about bid writing and improving the winning rate, click on the bottom customer service for free consultation.