Dry-method construction method for drift-sand roadbed

Abstract

The invention discloses a dry construction method for a wind-blown sand subgrade. According to physicochemical properties and mechanics characteristics of wind-blown sand, the method uses a vibrating compaction machine to perform vibration and rolling compaction on the wind-blown sand in a natural state paved on the subgrade under proper pressure by selecting proper vibration frequency and amplitude, so that the strength of the subgrade after the vibrating compaction meets the design requirement; and the method adopts a layer of the wind-blown sand and a layer of gravelly soil, and totally encloses the subgrade by clay or grit finally so as to avoid the wind erosion and ensure the overall stability of the subgrade. Compared with the prior art, the method avoids the use of precious water resources for construction in desert areas lacking water severely, not only reduces the construction cost of projects, but also reduces the influence on the local environment to the minimum level, and is an ideal construction method with economic and social benefits.

Description

technical field [0001] The invention relates to a construction method for railway subgrades and highway subgrades, in particular to a construction method for filling subgrades with aeolian sand as the main filler in desert areas. Background technique [0002] In order to meet the needs of economic construction, high-speed railways and high-grade highways have been vigorously developed, and the construction of railways and highways in desert areas has become a realistic need. When the filler for filling the subgrade is ordinary cohesive soil, the standard compaction and optimal water content are generally used as the compaction parameters controlled during construction, and it is sufficient to meet the standard requirements through testing. [0003] However, if ordinary cohesive soil is to be used to build roadbeds in desert areas, it needs to be transported from a distance, which is not only difficult to obtain soil, but also greatly increases the project cost and prolongs t...

AI Technical Summary

Problems solved by technology

[0006] Second, poor stability

[0009] The disadvantage of adopting the wet construction method for the aeolian sand subgrade is that in places with severe water shortage, the precious resource—water is used.

This not only increases the cost of the project, but also puts pressure on the local environment.

Therefore, in desert areas with severe water shortage, it is not suitable to use wet construction methods.