Saline soil roadbed filler and method for improving roadbed

A technology of subgrade filling and saline soil, which is applied in the field of geotechnical engineering, can solve problems affecting the formation and stability of CSH, high toxicity or danger, and weak salt corrosion resistance, so as to achieve good application prospects, shorten the maintenance cycle, and improve The effect of compressive strength

Active Publication Date: 2017-05-24
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because saline soil contains a variety of salts and the salt content is high, the effect of using conventional curing agents to cure saline soil is not ideal
For example, the most commonly used curing agent cement, its curing effect on ordinary roadbed is mainly through the formation of calcium silicate hydrate (CSH), and the large amount of sulfate, chloride, carbonate, etc. in saline soil seriously affect Formation and stabilization of CSH, resulting in low strength of cement-cured saline soil
At the same time, due to the long-term existence of a large number of salt ions in saline soil, the salt-corrosion resistance of cement-cured saline soil is very weak, so it is difficult to ensure the strength of the solidified soil by using cement to solidify the saline soil, and it is difficult to meet the engineering durability requirements. Require
However, in other existing soil stabilizers, the hydration product that achieves the curing effect is still mainly CSH, so there are all the above-mentioned curing problems
In addition, existing chemical curing agents (such as fine cement, epoxy resin, acrylamide, phenolic resin, polyurethane, etc.) have high toxicity or danger to a certain extent

Method used

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  • Saline soil roadbed filler and method for improving roadbed

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0048] This preparation example is used to illustrate the method of artificially preparing saline soil.

[0049] Sodium sulfate was added to the soil particles (collected from the suburbs of Bin County, Harbin), and after grinding and sieving, artificially prepared saline soils with a salt content of 1%, 3%, and 5% of their mass fractions were obtained, wherein , soil particles with a particle size of 0.25-0.5mm account for 20% of the total soil particle weight, soil particles with a particle size of 0.5-1mm account for 20% of the total soil particle weight, and particles with a particle size of 1-2mm account for the total soil particle weight 60% of.

preparation example 2

[0051] This preparation example is used to illustrate the preparation method of the microbial preparation.

[0052] Inoculate the culture medium (formulation: beef extract 5g / L, peptone 15g / L, sodium chloride 5g / L), cultured at 30°C for 48h to obtain a density of 1×10 9 CFU / mL of bacterial liquid.

Embodiment 1

[0054] This example is used to illustrate the saline soil roadbed filler provided by the present invention and its preparation method.

[0055] Take by weighing 100g saline soil with a salt content of 1% by weight obtained by Preparation Example 1, 5g anhydrous calcium chloride powder, 8g urea (purchased from Shandong Luxi Chemical Company, the same below), 10mL obtained by Preparation Example 2 and 1 g of sodium bicarbonate were placed in a mixer and stirred at room temperature (25° C.) for 0.5 h to obtain saline soil roadbed filler A1 (pH value was 8, water content was 25% by weight).

[0056] The results of the unconfined compressive strength of the saline soil roadbed filler A1 are shown in Table 1.

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Abstract

The invention relates to the field of geotechnical engineering and discloses a saline soil roadbed filler and a method for improving a roadbed. The saline soil roadbed filler provided by the invention contains saline soil, soluble calcium salt, urea and a microbial preparation, wherein the microbial preparation contains urease and/or bacteria producing the urease. The saline soil roadbed filler provided by the invention has higher compressive strength; meanwhile, as microorganisms extensively existed in soil body are used, harm can not be done to the environment or a human body, the saline soil roadbed filler has the advantage of being environmentally friendly, a maintenance period also can be shortened, and construction efficiency is improved.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a saline soil roadbed filler and a method for using the saline soil roadbed filler for roadbed improvement. Background technique [0002] As an important part of the entire transportation system, the roadbed directly bears the long-term effects of the superstructure load and the static and dynamic load of the vehicle, and the quality of the roadbed directly affects the driving speed and driving safety. Therefore, it is necessary to use high-quality roadbed fillers for filling . Entering the 21st century, with the acceleration of the construction of high-speed railways, express passenger lines, heavy-duty railways, expressways, railway tunnels, road tunnels and urban subways in China, as well as the in-depth advancement of the national coastal strategy and the western development strategy, more and more More and more basic engineering constructions are located in saline so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40E01C3/04E02D3/12C09K103/00
CPCC09K17/40C09K2103/00E01C3/04E02D3/12
Inventor 王博唐亮丁茂廷凌贤长
Owner CHINA SHENHUA ENERGY CO LTD
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