High-grade highway structure of soaked sand dredger filling embankment in coastal region

Abstract

The invention relates to a high-grade highway structure of a soaked sand dredger filling embankment in a coastal region, relating to an embankment pavement structure of a novel highway. The highway structure comprises a bagged sand cofferdam (1), an anti-leakage protection layer (8) outside the cofferdam (1), dredger filled sand (3) in the cofferdam, a pile base (2) in the dredger filled sand, a crushed rock layer (4), a cement-straightening gravel layer (6) and an asphalt cement layer (7) and is characterized in that a solidified cement layer is paved between the crushed rock layer (4) and the cement-straightening gravel layer (6), the crushed rock layer (4) has the thickness of 20-80 cm, the solidified cement layer with the thickness of 40-80 cm is paved at the top of the crushed rock layer (4), the cement-straightening gravel layer with the thickness of 30-60 cm is arranged on the solidified cement layer, and the total thickness of the three layers is 100-160 cm. According to the invention, great mounts of dredger filled sand and silt abundant in the coastal region are used as building materials for roadbeds and embankments and substitute a great amount of crushed rock needing long-distance transportation and having higher cost so as to decrease the construction cost and improve the comprehensive road performance; and the direct investment of the road construction is reduced by 20-40 percent by substituting partial cement for stabilizing gravels.

Description

technical field [0001] The patent of the invention relates to the subgrade pavement structure of a new type of highway, especially a high-grade highway suitable for flooding in coastal areas built with dredged sand and silt, which are rich in resources in coastal areas, as roadbed and subgrade materials. Background technique [0002] my country has formed a large number of land reclamation projects by using dredging sand filling methods. For example, Tangshan Caofeidian will become the world's largest reclamation project with a single dredging reclamation area. By 2020, the Caofeidian Industrial Zone will eventually be reclamated by sea reclamation. It forms a land area with a radius of 310 square kilometers. In the above-mentioned land reclamation projects, road construction is the most important infrastructure, and its economy, durability and practicality are the keys to restrict the development of the whole region. At present, many roads in land reclamation projects are b...

AI Technical Summary

Problems solved by technology

[0003] In the above-mentioned highway construction projects, the subgrade materials of the road bed are generally replaced and filled with foreign mountain stones or mountain soil. Although the stability and corrosion resistance of the roadbed can be greatly improved, due to the mountain stones or Mountain soil resources are scarce and need to be transported from far away mountainous areas, so the cost is high and the cycle is long, which cannot meet the requirements of the project

Therefore, there are also some projects where local materials are used, and a large amount of dredged sand is used as roadbed filler, but its road engineering characteristics are greatly affected by seawater, and its stability is poor. The design of graded highway structure is of great significance and value for the design, construction and long-term operation safety of this new type of highway structure

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