Special soil subgrade structure and construction method thereof

Abstract

The invention discloses a special soil subgrade structure and a construction method thereof. The special soil subgrade structure comprises a special soil, a triple-combined soil, a cohesive soil, a gravel cushion and a triple-combined soil base course, wherein bamboo filaments are additionally mixed in the triple-combined soil. According to the invention, the bearing capacity and the stability of the special soil subgrade structure can be improved; influences of extraneous water, such as side slope seepage, surface water, underground water and the like, on special soil can be also effectively blocked; the special soil sensitive to water, such as an expansive soil, a collapsible loess, a red clay, a salinized soil and the like, can be directly used for laying of the subgrade; building fillers can be sufficiently utilized to avoid spoiling of excavation soil, borrowing of fillers and transferring of the fillers; and the adoption of a novel bamboo material as reinforcing and slope-protecting materials adapts to a demand that the civil construction industry is developed towards low-carbon, energy-saving, environment-friendly and sustainable directions. Therefore, the special soil subgrade structure disclosed by the invention can save project investment and is energy-saving and environment-friendly.

Description

technical field [0001] The present invention relates to a special soil roadbed structure and its construction method, especially a roadbed structure and its construction method when roads and railways pass through expansive soil, collapsible loess, red clay, saline soil and other special soil areas. Construction method. Background technique [0002] With the rapid development of my country's transportation facilities, road and railway infrastructure projects are increasing day by day, many roads need to pass through special soil areas, accompanied by increasingly prominent road subgrade construction methods and disaster problems in special soil areas. [0003] Special soil refers to soil with special composition, state, structural characteristics and engineering properties, such as expansive soil, collapsible loess, red clay, saline soil, etc. For example, expansive soil has the characteristics of shrinking and cracking due to loss of water, and swelling and softening after...

AI Technical Summary

Problems solved by technology

[0005] The above three processing methods have the following disadvantages respectively. The first method requires a large amount of soil with good properties to replace the special soil, which greatly increases the transportation volume of earthwork, which will inevitably lead to increased investment and deterioration of the construction safety environment; second. The construction period of the first method is long and the process is relatively complicated; the third method is difficult to completely seal the foundation bed due to the insufficient width of the composite geomembrane, and the composite geomembrane is easily damaged by construction machinery during the construction process, thereby reducing the waterproof effect

[0006] For roadbed reinforcement and slope protection, geosynthetics are often used in traditional treatment methods. Geosynthetics can improve the stability of roadbed structures, but their raw materials are polymers. polymer , production needs to consume a lot of energy, and also produce a lot of pollutants, which will lead to energy consumption and environmental pollution. Therefore, in today's vigorously advocating sustainable development, we need to find low-carbon and environmentally friendly materials to replace

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