Construction method for processing saline soil roadbed by separation layer

A construction method and technology of partitioning layers, applied in the direction of roads, roads, buildings, etc., can solve problems such as unevenness, swelling, cracking, cracking and damage on the road surface, and affecting the normal operation of vehicles, so as to improve stability and service life, The effect of reducing project cost and easy control of construction quality

Inactive Publication Date: 2011-08-03
河南省新开元路桥工程咨询有限公司
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AI Technical Summary

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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  • Construction method for processing saline soil roadbed by separation layer
  • Construction method for processing saline soil roadbed by separation layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Treatment measures: clear the saline soil on the surface of the widened part of the subgrade (the thickness of the removal depends on the saline soil), replace it with gravel soil, and set a composite geomembrane to cover the gravel soil partition layer.

[0026] The subgrade structure layer of this section includes: 3cm thick fine-grained asphalt concrete, 4cm thick medium-grained asphalt concrete, 20cm thick cement stabilized gravel layer, 30cm thick natural graded gravel layer, composite geomembrane-coated isolation layer and the original roadbed surface layer . The cement-stabilized gravel layer contains 4-6% cement, and the cement is made of No. 32.5 ordinary Portland cement, and the rest is gravel; the maximum particle size of the gravel in the natural graded gravel is 5cm, and the soil content is less than 10%.

[0027] Its construction steps are as follows:

[0028] 1. Clear the surface soil of the original pavement layer, and compact it with a compaction degre...

Embodiment 2

[0033] Treatment measures: remove the saline soil on the surface of the subgrade (the thickness of the removal depends on the saline soil), replace it with gravel soil, and set a coarse sand filter layer to cover the gravel soil partition layer.

[0034] The subgrade structure layer of this section includes a 3cm-thick asphalt surface layer, an 18cm-thick cement-stabilized gravel layer, a gravel-soil barrier layer coated with a coarse sand filter layer and the original subgrade surface layer. The cement-stabilized gravel layer contains 4-6% cement, and the cement is made of No. 32.5 ordinary Portland cement, and the rest is gravel. The gravel-soil barrier layer covered by the coarse sand filter layer includes the upper coarse sand filter layer, the gravel barrier layer and the lower coarse sand filter layer. The construction steps are as follows:

[0035] 1. Lay the lower layer of coarse sand filter layer first, with a thickness of 10cm and a compaction degree of over 96%; pav...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/04
Inventor 黄卫民王彦君刘鸿韬丁玉琳郜天伟杨允王慧萍朱建宏郭雷
Owner 河南省新开元路桥工程咨询有限公司
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