Roadbed construction technology suitable for saline soil areas

A construction process and saline soil technology, applied in roads, roads, buildings, etc., can solve the problems of normal operation impact, shortened service life, waste of resources, etc., to reduce construction costs, salt swelling, and maintenance costs. Effect

Active Publication Date: 2018-11-09
CCCC SECOND HIGHWAY ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 4. After cracks appear on the road surface and subgrade, the groundwater level rises in spring, which is very easy to cause frozen accounts. Under the action of vehicle load, muddying occurs, normal operation is affected, the service life becomes shorter, and resources are wasted;
[0008] 5. Corrosive to cement, asphalt, steel and other materials

Method used

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  • Roadbed construction technology suitable for saline soil areas
  • Roadbed construction technology suitable for saline soil areas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A roadbed construction process suitable for saline soil areas. It includes the following steps. The first step is to detect the salt content of the original ground. If the salt content exceeds the standard, excavate the soil within a range of not less than 1.0m below the ground surface. When the design height of the embankment is less than 1.0m, the soil within the range of not less than 1.0m below the ground surface must be excavated and replaced with water-permeable soil to the original ground height. If the salt content is qualified, no treatment will be performed;

[0036] In the first step, the salt content standard is shown in Table 1.

[0037] Allowable salt content on the ground in saline soil area Table 1

[0038]

[0039] If the original ground soil is chlorinated saline soil and chlorite saline soil, the salt content shall not exceed 5%; if the original ground soil is sulfate saline soil and sulfite saline soil, the salt content shall not exceed 1%; if the original ...

Embodiment 2

[0050] The selection and treatment of fillers in the second step includes the following steps:

[0051] Step 1. Select the type of filler, and select the type of filler according to the filling layer of the filler, that is, the distance between the position of the filler and the top layer of the subgrade;

[0052] In the first step, the specific method for selecting the filler type according to the fill layer is shown in Table 2.

[0053] Availability of saline soil as roadbed filler Table 2

[0054]

[0055] If the fill layer is within 0-80cm, use gravel or aeolian sand as the filler; if the fill layer is within 80-150cm, use coarse-grained weakly saline soil among sulfated saline soil and sulfite saline soil And coarse-grained weakly saline soil in chlorinated saline soil and chlorinated saline soil, coarse-grained medium-grained saline soil and fine-grained weakly saline soil as fillers; if the fill layer is below 150cm, use saline soil And the coarse-grained weak saline soil in t...

Embodiment 3

[0061] In the fourth or eighth step, the water content of the filler is tested before paving the filler. If the filler is gravel or sandy soil, the water content of the soil is -2% to +3% of the optimal water content If the filling field is any soil material except gravel soil or sandy soil, the water content of the soil material is ±1% of the optimal water content. If the water content exceeds the standard, the filling is aired. If it is too low, water the filler. When sprinkling, choose a sprinkler above 10L for sprinkling. It is best to sprinkle in the afternoon or evening to reduce the influence of water evaporation. At the same time, rain will affect the water content of the filler, so no construction is done on rainy days.

[0062] In the fourth and eighth steps, the thickness of the paving layer of filler does not exceed 30 cm.

[0063] In the sixth and tenth steps, the surface of the compacted packing has a slope of not less than 1.5%.

[0064] In the seventh step, the barr...

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PUM

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Abstract

The invention discloses a roadbed construction technology suitable for saline soil areas. The roadbed construction technology comprises the following steps of salt content detection of the original ground, filler type selecting, filler field testing, material covering processing, pre-roadbed-filling treatment, layered filler paving, filler compaction, separation layer laying and roadbed water problem treatment. A roadbed with the low construction cost and capable of reducing incidence of common diseases such as salt expansion, freezing expansion and melt sinking during application period is provided, integrity of road structure and comfort and security of vehicle driving are guaranteed, and application and maintenance costs are lowered.

Description

Technical field [0001] The invention belongs to the field of roadbed construction, and particularly relates to a roadbed construction process suitable for saline soil areas. Background technique [0002] As we all know, salt is a compound composed of metal ions (including ammonia ions) and acid ions. According to its solubility in water, it is divided into three types: easily soluble salt (such as sodium chloride, sodium sulfate, magnesium sulfate), medium soluble salt (calcium sulfate) and insoluble salt (calcium carbonate). Alkaline soil is the soil that has more sodium ions adsorbed and substituted by the soil colloid, or contains sodium carbonate and sodium bicarbonate, so it shows alkaline reaction. The saline soil is the general term for saline-alkali soils of varying degrees. In highway engineering, the soil with an average soluble salt content greater than 0.3% within 1.0m below the surface is saline soil. [0003] The saline soil will cause the following main diseases t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/00E01C3/04
CPCE01C3/00E01C3/04
Inventor 薛成王帅帅杨永斌薛淏文李晓华
Owner CCCC SECOND HIGHWAY ENG CO LTD
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