Extra-fine sand blow-filling roadbed structure in low-lying marsh area

Abstract

The invention discloses an extra fine sand blow-filling roadbed structure in a low-lying marsh area and a road building method, and relates to the field of road engineering. The technical problem to be firstly solved is to provide a type of extra fine sand blow-filling roadbed structure which adopts the technical scheme as follows: the extra fine sand blow-filling roadbed structure in the low-lying marsh area which comprises an underwater extra fine sand layer which is filled by blow on the underwater clay foundation, and the sand blocking stakes vertically arranged respectively on the two sides of the road along the road direction, cross beams are connected between the sand blocking stakes and sand blocking nets are hung between the sand blocking stakes, the sand blocking stake supportingand retaining structure not only limits the loss of road construction materials in the blow-filling process, but also limits the sliding of the deep layer roadbed soil in the blow-filling area, improving the anti-sliding stability and the bearing capacity of the soft foundation. The upper part of the underwater extra-fine sand layer is overwater extra-fine sand, the overwater extra-fine sand comprises a cofferdam and a middle layer, and the upper side of the overwater extra-fine sand is provided with a secondary base layer. The extra-fine sand blow-filling roadbed structure in low-lying marsharea is suitable for road engineering in areas where road construction materials are deficient but extra fine sand exists in large amount, and also can be used for road engineering in offshore cities.

Description

technical field [0001] The invention relates to the field of roadbed engineering, in particular to a roadbed structure and a road building method built in low-lying swampy areas by using blown-filled extra-fine sand. Background technique [0002] In countries or regions located in alluvial plains, road construction materials, including rock and concrete aggregates, are scarce, but there are a large amount of silt and ultra-fine sand containing a certain amount of clay in the river channel, and its fineness modulus is between 0.48 and 0.62. It belongs to the category of ultra-fine sand. In addition, these countries or regions are often suitable for the growth of bamboo. Bamboo has high elasticity and toughness. The tensile strength along the grain reaches 170MPa, and the compressive strength along the grain reaches 80MPa. It is an environmentally friendly building material. There are also low-lying swampy areas widely in the alluvial plains, which belong to weak foundations....

AI Technical Summary

Problems solved by technology

There are also low-lying swampy areas widely in the alluvial plains, which belong to weak foundations. Roads have to pass through these weak foundations. The cost of road construction materials is high, time-consuming, and uneconomical.

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