Construction method for processing saline soil roadbed by separation layer

Abstract

The invention relates to a construction method for processing a saline soil roadbed by a separation layer, comprising the following steps: the separation layer is arranged in a mode that compound geomembranes cover a gravel soil separation layer; the compound geomembranes are laid according to the width of the cross section of the roadbed; firstly, an inner compound geomembrane is laid; then an outer compound geomembrane is laid; the compound geomembranes are flatly laid and tightly adhered to the surface of the roadbed; the gravel soil separation layer is laid on the compound geomembranes and is filled and laminated by layers; the compound geomembranes cover the gravel soil separation layer; gravel soil is filled between the separation layer and the original roadbed surface layer; and the degree of compaction of the top layer is above 97%. According to the construction method disclosed by the invention, the saline soil can be effectively prevented from carrying out salt expansion, corroding and the like on the roadbed, a road surface structure layer can be prevented from damaging, the construction is convenient, the cost of engineering construction can be lowered, the curing cost is reduced, and the stability and the service life of the roadbed can be improved. The practice proves that the scheme brings a better technical effect in the saline soil roadbed construction.

Description

technical field [0001] The invention relates to a roadbed construction method, in particular to a construction method for treating saline soil roadbed with a partition layer. Background technique [0002] Saline soil is the product of salt water migrating with groundwater in the process of soil salinization, which can damage roadbeds and structures. In highway engineering, it mainly refers to the saline soil layer with a soluble salt content of more than 0.3% within 1 meter of the surface soil layer. Due to the existence of soluble salt in the soil, the difference in the type and content of the salt will change the basic engineering properties of the soil. There are two main hazards of saline soil: salt swelling and salt erosion. Among them, the road salt swelling disease is more serious, which causes the road surface to be damaged to varying degrees every year with the seasons, causing great economic losses. [0003] The main hazards of saline soil to the subgrade includ...

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Problems solved by technology

Slurry is formed under the repeated action of external loads, making the road surface cracked, damaged, muddy, and slippery, affecting the normal operation of vehicles, and it is more common in areas with chlorine-salted soil; (3) diseases such as salt swelling are mainly caused by Local unevenness, bulging, and cracking of the pavement caused by the salt crystallization and expansion of salt in the soil will also cause the roadbed slope and the surface of the road shoulder to be loose and porous under the repeated action of salt expansion caused by day and night temperature changes, making the road vulnerable to wind erosion and subsidence. Salt expansion mainly occurs in sulfuric acid saline soil; (4) Corrosion is mainly due to the chemical reaction between the soluble salt contained in saline soil and the metal materials and non-metal materials used in road engineering. , resulting in cracking of the properties of these materials or finished products, eventually leading to road damage

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