CN109884271A - Consider the simple surveying method of the swollen coefficient of coarse grain salt marsh earth salt of gradation and salt content - Google Patents
Consider the simple surveying method of the swollen coefficient of coarse grain salt marsh earth salt of gradation and salt content Download PDFInfo
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- CN109884271A CN109884271A CN201910155162.5A CN201910155162A CN109884271A CN 109884271 A CN109884271 A CN 109884271A CN 201910155162 A CN201910155162 A CN 201910155162A CN 109884271 A CN109884271 A CN 109884271A
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Abstract
A kind of simple surveying method of the swollen coefficient of coarse grain salt marsh earth salt considering gradation and salt content scientifically and rationally to reconnoitre the swollen coefficient of coarse grain salt marsh earth salt, and implements convenient, clear process, can adapt to coarse grain salinized soil prospective design needs.The following steps are included: (1) determines coarse grain salt marsh soil particle grading curve, determines coarse grain salinized soil soluble salt content ζ by indoor geotechnique's screening and chemistry titration test；(2) according to step (1) coarse grain salt marsh soil particle grading curve, the thickness partial size ratio R of coarse grain salinized soil is determined by following formula5:(3) the swollen coefficient η of coarse grain salt marsh earth salt is determined by following formula:
Description
Technical field
The present invention relates to Geotechnical Engineering field, in particular to a kind of coarse grain salt marsh earth salt for considering gradation and salt content
The swollen simple surveying method of coefficient.
Technical background
Salinized soil is a kind of general designation with the different degrees of salinization of soil soil body, has the spies such as salt expandability, molten sunken property, corrosivity
Sign, in various countries, arid, semiarid zone and sea front are widely distributed.Coarse grain salt marsh soil mechanics characteristic is preferable, high-speed railway,
In highway construction, has the precedent using coarse grain salinized soil railway embankment.Salt is swollen, and coefficient cannot be only used for judging coarse grain salinized soil
Salt expandability, it may also be used for determine the salt bulk of salinized soil, such as " saline soil area construction standards " (SY/T 0317-2012) salt
The salt bulk of stain soil base is namely based on the swollen coefficient of salt and is determined, i.e.,
Sη0=η H
In formula, Sη0For total salt bulk of brining ground foundation, unit mm；η is the swollen coefficient of salt；H is the swollen area's thickness of effective salt, single
Position mm.
Currently, the swollen coefficient of coarse grain salt marsh earth salt is logical referring especially to " saline soil area construction standards " (SY/T0317-2012)
It crosses laboratory test or field test determines, test process is complicated, the period is long, time-consuming and laborious, it is difficult to it is huge to adapt to Along Railway quantity
Big prospecting demand.For this purpose, needing to propose a kind of simple surveying method of easy swollen coefficient of coarse grain salt marsh earth salt, to meet railway
Or highway subgrade construction construction demand, especially meet the prospective design needs of railway or highway early period.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of swollen systems of coarse grain salt marsh earth salt for considering gradation and salt content
The simple surveying method of number scientifically and rationally to reconnoitre the swollen coefficient of coarse grain salt marsh earth salt, and implements convenient, clear process, can
The prospective design of coarse grain salinized soil is adapted to need.
It is as follows that the present invention solves technical solution used by above-mentioned technology:
The present invention proposes to consider the simple surveying method of the swollen coefficient of coarse grain salt marsh earth salt of gradation and salt content, including following step
It is rapid:
(1) it by indoor geotechnique's screening and chemistry titration test, determines coarse grain salt marsh soil particle grading curve, determines coarse grain
Salinized soil soluble salt content ζ, unit %；
(2) according to step (1) coarse grain salt marsh soil particle grading curve, the thickness of coarse grain salinized soil is determined by following formula
Partial size ratio R5:
In formula, R5For the thickness partial size ratio of coarse grain salinized soil；A is that the native content of partial size d > 5mm accounts for the percentage of gross mass,
Unit %；B is that the native content of partial size 0.25mm < d < 5mm accounts for the percentage of gross mass, unit %；
(3) the swollen coefficient η of coarse grain salt marsh earth salt is determined by following formula
In formula, η is the swollen coefficient of coarse grain salt marsh earth salt；ψ is the experiential modification coefficient with 95% confidence level, take 0.64~
0.84；ζ is coarse grain salinized soil soluble salt content, unit %；R5For the thickness partial size ratio of coarse grain salinized soil.
The invention has the advantages that can not only effectively overcome traditionally the swollen coefficient of coarse grain salt marsh earth salt determine that method is deposited
Technical deficiency, and this method implementing procedure is clear, easy operation, parameter are convenient for test, can adapt to baysalt
Stain soil prospective design needs；The method of the present invention is to combine more than the 80 group swollen tests of coarse grain salt marsh earth salt, and considering coarse grain salinized soil
On the basis of salt content and grading curve feature, by the surface fitting and statistical analysis of test data, to propose thick
The prospecting empirical equation of the grain swollen coefficient of salt marsh earth salt, scientifically and rationally reconnoitres the swollen coefficient of coarse grain salt marsh earth salt, it can adapt to coarse grain
Salinized soil prospective design needs.
Detailed description of the invention
Fig. 1 is coarse grain salt marsh soil particle grading curve figure in the embodiment of the present invention.
Specific embodiment
The present invention is further illustrated below by specific embodiment and in conjunction with attached drawing.
The simple surveying method of the swollen coefficient of coarse grain salt marsh earth salt of consideration gradation and salt content of the invention, including following step
It is rapid:
(1) it by indoor geotechnique's screening and chemistry titration test, determines coarse grain salt marsh soil particle grading curve, determines coarse grain
Salinized soil soluble salt content ζ, unit %；
(2) according to step (1) coarse grain salt marsh soil particle grading curve, the thickness of coarse grain salinized soil is determined by following formula
Partial size ratio R5:
In formula, R5For the thickness partial size ratio of coarse grain salinized soil；A is that the native content of partial size d > 5mm accounts for the percentage of gross mass,
Unit %；B is that the native content of partial size 0.25mm < d < 5mm accounts for the percentage of gross mass, unit %；
(3) the swollen coefficient η of coarse grain salt marsh earth salt is determined by following formula
In formula, η is the swollen coefficient of coarse grain salt marsh earth salt；ψ is the experiential modification coefficient with 95% confidence level, take 0.64~
0.84；ζ is coarse grain salinized soil soluble salt content, unit %；R5For the thickness partial size ratio of coarse grain salinized soil.
In the step (1), (3), coarse grain salinized soil soluble salt content ζ is using the drying soil sample by 5mm sieve pore
300g, by Tu Shui than forming prepare liquid after 1: 5 extraction 3min, filtered leachate measures lyotropic salt total amount by mass method.
Embodiment:
A certain high-speed railway subgrade is built in saline soil area, it is salinized soil that this area, which largely takes Tu Chang, therefore intends adopting
The coarse grain salinized soil for collecting a certain place is used as roadbed filling, since high-speed railway subgrade Deformation control requires strictly, to avoid transporting
Battalion's phase roadbed generates arch disease, and prospecting is needed to grasp the swollen coefficient of salt of the place coarse grain salinized soil before roadbed filling.
Determine that this takes the swollen coefficient of salt of 4 groups of native field coarse grain salinized soil soil sample using the method for the present invention prospecting below, it is specific to walk
It is rapid as follows:
(1) it by indoor geotechnique's screening and chemistry titration test, determines coarse grain salt marsh soil particle grading curve, sees Fig. 1；Really
Determine coarse grain salinized soil soluble salt content ζ, is shown in Table 1；
(2) according to step (1) coarse grain salt marsh soil particle grading curve, the thickness of coarse grain salinized soil is determined by following formula
Partial size ratio R5:
In formula, R5For the thickness partial size ratio of coarse grain salinized soil；A is that the native content of partial size d > 5mm accounts for the percentage of gross mass,
Unit %；B is that the native content of partial size 0.25mm < d < 5mm accounts for the percentage of gross mass, unit %.
The thickness partial size ratio R of 4 groups of coarse grain salinized soil soil samples5Definitive result is shown in Table 1.
(3) the swollen coefficient η of coarse grain salt marsh earth salt is determined by following formula
In formula, η is the swollen coefficient of coarse grain salt marsh earth salt；ψ is the experiential modification coefficient with 95% confidence level, take 0.64~
0.84；ζ is coarse grain salinized soil soluble salt content, unit %；R5For the thickness partial size ratio of coarse grain salinized soil.
In calculating process, m takes the determination of 0.8,4 groups of swollen coefficient δ of coarse grain salinized soil soil sample salt to the results are shown in Table 1.
The determination process and result of the 1 swollen coefficient δ of coarse grain salt marsh earth salt of table
| Soil sample number | ζ | A | B | R5 | δ |
| S-1 | 0.536 | 50.7 | 44.3 | 1.144 | 0.0049 |
| S-2 | 0.558 | 38.5 | 50.8 | 0.758 | 0.0058 |
| S-3 | 0.588 | 47.4 | 42.3 | 1.121 | 0.0052 |
| S-4 | 0.652 | 43.9 | 47.4 | 0.926 | 0.0059 |
The swollen coefficient of the coarse grain salt marsh earth salt simple surveying method provided by the invention for considering gradation and salt content, can not only
Effectively overcome technical deficiency existing for the traditionally swollen coefficient surveying method of coarse grain salt marsh earth salt, and this method implementing procedure is clear
Clear, easy operation, parameter are able to satisfy the needs of Practical Project, have broad popularization and application prospect convenient for test.
The above only considers the swollen coefficient letter of coarse grain salt marsh earth salt of gradation and salt content using the diagram illustrating present invention
Some principles of easy surveying method are not intended to for the present invention being confined in shown and described specific method and the scope of application,
Therefore all corresponding modifications that may be utilized and equivalent, belong to the applied the scope of the patents of the present invention.
Claims (2)
1. considering the simple surveying method of the swollen coefficient of coarse grain salt marsh earth salt of gradation and salt content, comprising the following steps:
(1) it by indoor geotechnique's screening and chemistry titration test, determines coarse grain salt marsh soil particle grading curve, determines coarse grain salt marsh
Native soluble salt content ζ, unit %；
(2) according to step (1) coarse grain salt marsh soil particle grading curve, the thickness partial size of coarse grain salinized soil is determined by following formula
Compare R5
In formula, R5For the thickness partial size ratio of coarse grain salinized soil；A is that the native content of partial size d > 5mm accounts for the percentage of gross mass, single
Position %；B is that the native content of partial size 0.25mm < d < 5mm accounts for the percentage of gross mass, unit %；
(3) the swollen coefficient η of coarse grain salt marsh earth salt is determined by following formula
In formula, η is the swollen coefficient of coarse grain salt marsh earth salt；ψ is the experiential modification coefficient with 95% confidence level, takes 0.64~0.84；ζ
For coarse grain salinized soil soluble salt content, unit %；R5For the thickness partial size ratio of coarse grain salinized soil.
2. the simple surveying method of the swollen coefficient of coarse grain salt marsh earth salt of gradation and salt content is considered as described in claim 1, it is special
Sign is: in the step (1), (3), coarse grain salinized soil soluble salt content ζ is using the drying soil sample by 5mm sieve pore
300g, by Tu Shui than forming prepare liquid after 1: 5 extraction 3min, filtered leachate measures lyotropic salt total amount by mass method.
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Citations (4)
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|---|---|---|---|---|
| DE10331434A1 (en) * | 2003-07-10 | 2005-02-24 | Anton Lindner | Moistening device for de-icing salt in spreader vehicles has discharge tubes with salt compression guide and salt expansion section below, to enlarge salt area available to be sprayed |
| CN108645764A (en) * | 2018-06-14 | 2018-10-12 | 中铁二院成都勘察设计研究院有限责任公司 | A kind of method of the molten sunken coefficient of determining coarse granule sodium sulphate salinized soil |
| CN108693333A (en) * | 2018-06-14 | 2018-10-23 | 中铁二院成都勘察设计研究院有限责任公司 | A kind of method of the swollen coefficient of determining coarse granule sodium sulphate salt marsh earth salt |
| CN108914909A (en) * | 2018-07-24 | 2018-11-30 | 中铁二院工程集团有限责任公司 | A kind of measuring method of brining ground foundation salt bulk |
-
2019
- 2019-02-28 CN CN201910155162.5A patent/CN109884271A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10331434A1 (en) * | 2003-07-10 | 2005-02-24 | Anton Lindner | Moistening device for de-icing salt in spreader vehicles has discharge tubes with salt compression guide and salt expansion section below, to enlarge salt area available to be sprayed |
| CN108645764A (en) * | 2018-06-14 | 2018-10-12 | 中铁二院成都勘察设计研究院有限责任公司 | A kind of method of the molten sunken coefficient of determining coarse granule sodium sulphate salinized soil |
| CN108693333A (en) * | 2018-06-14 | 2018-10-23 | 中铁二院成都勘察设计研究院有限责任公司 | A kind of method of the swollen coefficient of determining coarse granule sodium sulphate salt marsh earth salt |
| CN108914909A (en) * | 2018-07-24 | 2018-11-30 | 中铁二院工程集团有限责任公司 | A kind of measuring method of brining ground foundation salt bulk |
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| 姚晓峰等: "质量法测定土中易溶盐硫酸根含量方法的改进", 《山西建筑》 * |
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