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An improvement and detection method suitable for saline soil in high and severe cold areas

A detection method and saline soil technology, which is applied in high and severe cold natural environment areas, can solve the problems of stay, environmental pollution, and difficulty in direct application of research results to engineering construction, and achieve the effect of highlighting technological progress

Inactive Publication Date: 2016-09-21
XINJIANG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The soil stabilizer can effectively cure the medium and strong saline soil of the sulfate-chloride type with a dosage of 8%-12%, and the saline soil whose soluble salt content does not exceed 6%; the disadvantages of this stabilizer On the one hand, ordinary Portland cement is used in the formula, and the production of cement needs to waste natural resources and cause great pollution to the environment; on the other hand, the curing agent does not meet the requirements for curing all types of saline soil, because The ion content of saline soil in different regions is quite different, and the formulations of improved reagents are also quite different
However, these experimental studies are all indoor experiments, and the main disadvantage is that they do not consider the influence of comprehensive factors in the actual natural environment on the properties of the project and the possibility of secondary salinization of the improved saline soil. Improvements are only preliminary
[0005] To sum up, although there are many methods of improving saline soil in this field, as well as experimental research on engineering properties after improvement; but these improvement methods are not specific to the improvement of saline soil in high and severe cold regions such as Xinjiang, and some experiments are still The basic experimental research staying indoors does not really consider the influence of natural environmental conditions on the engineering properties of the improved saline soil, so the research results are difficult to be directly applied to engineering construction

Method used

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  • An improvement and detection method suitable for saline soil in high and severe cold areas
  • An improvement and detection method suitable for saline soil in high and severe cold areas
  • An improvement and detection method suitable for saline soil in high and severe cold areas

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Experimental program
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Effect test

Embodiment 1

[0046] The Lop Nur area in Xinjiang is the original ecological saline soil, which is low liquid limit clay, with a salt content ranging from 2.5% to 4.2%, and an average salt content of 3.3%. The optimal moisture content is 13.6%, and the maximum dry density is 1.84g / cm 3 ; After the basic test in the room, it is determined that the addition amount of the improved reagent is 27%, and the ratio of the improved reagent materials fly ash, carbide slag, steel slag, slag powder, TG-2 soil curing agent and saline soil is 12:3:3 : 5.5: 0.025: 76.5 (see Table 1).

[0047] Test and verification: After 14 days of health preservation and 7 days of soaking in water, the test piece was tested for CBR (expansion), and the test value of the expansion rate was 1.53%; the dry-wet cycle test used the dry-wet cycle durability coefficient as the evaluation of the improved soil The index of resistance to dry and wet cycles, after 12 times of dry and wet cycles, the durability coefficient is 0.64;...

Embodiment 2

[0055] The saline soil on the road from Yuepu Lake to Yingjisha in Kashi area contains sandy low liquid limit clay, the salt content ranges from 2.5% to 3.3%, the average salt content is 2.9%, the optimal moisture content is 14.7%, and the maximum dry density 1.79g / cm 3 ; After the basic test in the room, it is determined that the addition amount of the improved reagent is 21.5%, and the improved reagent is determined to be: fly ash, carbide slag, steel slag, slag powder, TG-2 type soil curing agent and saline soil The ratio is 9:2.5 :2:5:0.020:81.5 (see Table 2).

[0056]Testing and verification: After 14 days of health preservation and 7 days of soaking in water, a CBR (expansion) test was carried out, and the measured expansion rate test value was 1.59%. The index of dry-wet cycle ability, after 12 times of dry-wet cycle, the durability coefficient is 0.69; the cold and hot cycle test is carried out in the laboratory with a low temperature thermostat, and the compressive s...

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Abstract

The invention provides an improver and a detecting method for salty soil in high severe cold areas. The improver is composed of coal ash, carbide slag, steel slag, superfine slag powder and a TG-2 soil consolidator. The ratio of the improver is determined according to the different contents and types of salty soil in different areas, the salty soil is subjected to improvement experiment, the frost heave and thaw collapsibility effect of the improved salty soil are detected by using a multiple freezing and thawing circle detecting device, meanwhile, an improved salty soil test piece is prepared by using a test piece preparation device, mechanical parameters such as strength and the like of the improved salty soil are detected by using a triaxial shear apparatus to obtain technical parameters required by engineering construction, and then, the improved salty soil is comprehensively judged. The improver has important scientific value and practical significance.

Description

technical field [0001] The invention relates to soil improvement technology, mainly for engineering construction land, especially suitable for high and severe cold natural environment areas such as Xinjiang; it provides a method of using industrial waste (fly ash, carbide slag, steel slag and slag micropowder, etc.) to saline soil The improvement and the detection method have excellent effects after improvement, meet the requirements of engineering construction, and greatly reduce the investment and cost of engineering construction. Background technique [0002] Saline soil is widely distributed in the western region. As the country increases investment in infrastructure projects such as roads, railways, and airports in the western region, many infrastructures encounter saline soil layers and roadbeds during the construction process, such as the Qinghai-Tibet Railway , Lanzhou-Xinjiang Railway, Hami-Lop Nur Railway, etc., but the saline soil has brought problems such as salt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08G01N33/24G01N3/00G01N3/60G01N17/00
Inventor 张凌凯张远芳慈军刘亮王建祥乔箭马铁成陈亮亮张苏
Owner XINJIANG AGRI UNIV