CN109490353A - A kind of salt marsh earth salt-frost-heave force with high salt determines method - Google Patents
A kind of salt marsh earth salt-frost-heave force with high salt determines method Download PDFInfo
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Abstract
A kind of salt marsh earth salt-frost-heave force with high salt determines method, determines salinized soil region salt marsh earth salt-frost-heave force with high salt with scientific and reasonable prospecting, meets Practical Project prospecting needs.The following steps are included: by field sampling and laboratory soil test, the compression strength E of the natural moisture content w of salinized soil with high salt, porosity n, Poisson's ratio υ, salt content s and salinized soil with high salt are determinedc；Determine temperature T when salinized soil crystal salt with high salt is initially precipitatedm, T=TfSalinized soil water content w with high salt at=0 DEG C0；By live in-situ test, the minimum temperature T that salinized soil with high salt occurs during cooling is determined；Determine the non-phase transformation cumulative water-oil ratio w of crystallization salinized soil with high salt when salting outu1；Determine salinized soil with high salt when ice water phase transformation does not freeze cumulative water-oil ratio wu2；Salt marsh earth salt-frost-heave force σ with high salt is determined by being calculated as followse:
Description
Technical field
The present invention relates to Geotechnical Engineering field, in particular to a kind of salt marsh earth salt-frost-heave force with high salt determines method.
Technical background
Salinized soil refers to the general designation of the different degrees of salinization of soil soil body, arid, semiarid zone and littoral area in the whole world
Domain is widely distributed.Brining ground foundation, especially shallow-layer salinized soil have apparent salt-frost-heaving deformation characteristic, this engineering characteristic
Easily lead to engineering construction of structures protuberance cracking, for high-speed railway, especially high speed is without tiny fragments of stone, coal, etc. subgrade engineering, salt marsh earth salt-
Frost-heave force may cause track irregularity aggravation, threaten the operation of train high-speed secure.Salinized soil with high salt refers to that salt content is higher
Salinized soil, in temperature-fall period, forming salt expansive force is precipitated in crystal salt first, as temperature further decreases, frost-heave force
Also it will gradually play, salt-frost-heave force is the principal element for causing salinized soil protuberance deformation with high salt.
When high-speed railway subgrade engineering design is carried out in salinized soil region with high salt, needs prospecting and determine salt marsh soil with high salt
Salt-frost-heaving deformation of brining ground foundation with high salt is eliminated or weakened to salt-frost-heave force of base to take effective engineering measure.Room
Inner salt-frost heave test determine salt marsh earth salt-frost-heave force there are the drawbacks of be to test that time-consuming, instrument requirements are high, experiment work
Amount is big, is unfavorable for engineering popularization and application, and have specification, document, patent and also seldom refer to salt marsh earth salt-frost-heave force with high salt
It is simple to determine method.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of salt marsh earth salt-frost-heave forces with high salt to determine method, with science
It rationally reconnoitres and determines salinized soil region salt marsh earth salt-frost-heave force with high salt, meet Practical Project prospecting needs.
It is as follows that the present invention solves technical solution used by above-mentioned technology:
The present invention proposes that a kind of salt marsh earth salt-frost-heave force with high salt determines method, comprising the following steps:
(1) by field sampling and laboratory soil test, natural moisture content w, porosity n, the pool of salinized soil with high salt are determined
Pine ratio υ and salt content s；Determine the compression strength E of salinized soil with high saltc, unit: kPa；Determine that salinized soil crystal salt with high salt is initially analysed
Temperature T when outm, unit: DEG C；Determine T=TfSalinized soil water content w with high salt at=0 DEG C0；
(2) by live in-situ test, the minimum temperature T that salinized soil with high salt occurs during cooling is determined, unit: DEG C；
(3) the non-phase transformation cumulative water-oil ratio w of salinized soil with high salt when determining that crystallization salts out by following formulau1:
In formula, wu1The non-phase transformation cumulative water-oil ratio of salinized soil with high salt when being salted out to crystallize；M1Salt with high salt when being salted out for crystallization
The porosity distribution parameter of stain soil, unit: DEG C-1, take 0.01~0.05 DEG C-1；T is that salinized soil with high salt occurs during cooling
Minimum temperature, unit: DEG C, by step (2) determine； TmTemperature when being initially precipitated for salinized soil crystal salt with high salt, unit: DEG C,
It is determined by step (1)； TfFor the solidification point of free body ponding under normal pressure, unit: DEG C, take 0 DEG C；ζ is T=TfWhen salt with high salt
The non-phase transformation cumulative water-oil ratio of stain soil；
(4) do not freeze cumulative water-oil ratio w by what following formula determined salinized soil with high salt when ice water phase transformationu2:
In formula, wu2Salinized soil with high salt does not freeze cumulative water-oil ratio when for ice water phase transformation；M2Salinized soil with high salt when for ice water phase transformation
Porosity distribution parameter, unit: DEG C-1, take 0.03~0.10 DEG C-1；T occurs during cooling minimum for salinized soil with high salt
Temperature, unit: DEG C, it is determined by step (2)；TmTemperature when being initially precipitated for salinized soil crystal salt with high salt, unit: DEG C, by step
(1) it determines；TfFor the solidification point of free body ponding under normal pressure, unit: DEG C, take 0 DEG C；
(5) salt marsh earth salt-frost-heave force σ with high salt is determined by following formulae:
In formula, σeFor salt marsh earth salt-frost-heave force with high salt, unit: kPa；S is salinized soil salt content with high salt, by step (1)
It determines；W is salinized soil natural moisture content with high salt, is determined by step (1)；N is salinized soil porosity with high salt, true by step (1)
It is fixed；EcFor salinized soil compression strength with high salt, unit: kPa is determined by step (1)；υ is salinized soil Poisson's ratio with high salt, by step
(1) it determines；wu1The non-phase transformation cumulative water-oil ratio of salinized soil with high salt when salting out to crystallize, is determined by step (3)；wu2For ice water phase transformation
When salinized soil with high salt do not freeze cumulative water-oil ratio, determined by step (4)；T is the lowest temperature that salinized soil with high salt occurs during cooling
Degree, unit: DEG C, it is determined by step (2)；TmTemperature when being initially precipitated for salinized soil crystal salt with high salt, unit: DEG C, by step
(1) it determines；TfFor the solidification point of free body ponding under normal pressure, unit: DEG C, take 0 DEG C.
The invention has the advantages that establishing a kind of salt marsh earth salt-frost-heave force with high salt determines method, it can be effective gram
Take laboratory test determine salt marsh earth salt-frost-heave force with high salt there are the drawbacks of, facilitate salinized soil engineering investigation, improve with high salt
Salt marsh earth salt-frost-heave force determines speed, and this method implementing procedure is clear, easy operation, operability are stronger, meets work
Journey prospecting needs.
Specific embodiment
Progress explanation is made to the present invention below by specific embodiment.
A kind of salt marsh earth salt-frost-heave force with high salt of the invention determines method, comprising the following steps:
(1) by field sampling and laboratory soil test, natural moisture content w, porosity n, the pool of salinized soil with high salt are determined
Pine ratio υ and salt content s；Determine the compression strength E of salinized soil with high saltc, unit: kPa；Determine that salinized soil crystal salt with high salt is initial
Temperature T when precipitationm, unit: DEG C；Determine T=TfSalinized soil water content w with high salt at=0 DEG C0；
(2) by live in-situ test, the minimum temperature T that salinized soil with high salt occurs during cooling is determined, unit: DEG C；
(3) the non-phase transformation cumulative water-oil ratio w of salinized soil with high salt when determining that crystallization salts out by following formulau1:
In formula, wu1The non-phase transformation cumulative water-oil ratio of salinized soil with high salt when being salted out to crystallize；M1Salt with high salt when being salted out for crystallization
The porosity distribution parameter of stain soil, unit: DEG C-1, take 0.01~0.05 DEG C-1；T is that salinized soil with high salt occurs during cooling
Minimum temperature, unit: DEG C, by step (2) determine； TmTemperature when being initially precipitated for salinized soil crystal salt with high salt, unit: DEG C,
It is determined by step (1)； TfFor the solidification point of free body ponding under normal pressure, unit: DEG C, take 0 DEG C；ζ is T=TfWhen salt with high salt
The non-phase transformation cumulative water-oil ratio of stain soil；
(4) do not freeze cumulative water-oil ratio w by what following formula determined salinized soil with high salt when ice water phase transformationu2:
In formula, wu2Salinized soil with high salt does not freeze cumulative water-oil ratio when for ice water phase transformation；M2Salinized soil with high salt when for ice water phase transformation
Porosity distribution parameter, unit: DEG C-1, take 0.03~0.10 DEG C-1；T occurs during cooling minimum for salinized soil with high salt
Temperature, unit: DEG C, it is determined by step (2)；TmTemperature when being initially precipitated for salinized soil crystal salt with high salt, unit: DEG C, by step
(1) it determines；TfFor the solidification point of free body ponding under normal pressure, unit: DEG C, take 0 DEG C；
(5) salt marsh earth salt-frost-heave force σ with high salt is determined by following formulae:
In formula, σeFor salt marsh earth salt-frost-heave force with high salt, unit: kPa；S is salinized soil salt content with high salt, by step (1)
It determines；W is salinized soil natural moisture content with high salt, is determined by step (1)；N is salinized soil porosity with high salt, true by step (1)
It is fixed；EcFor salinized soil compression strength with high salt, unit: kPa is determined by step (1)；υ is salinized soil Poisson's ratio with high salt, by step
(1) it determines；wu1The non-phase transformation cumulative water-oil ratio of salinized soil with high salt when salting out to crystallize, is determined by step (3)；wu2For ice water phase transformation
When salinized soil with high salt do not freeze cumulative water-oil ratio, determined by step (4)；T is the lowest temperature that salinized soil with high salt occurs during cooling
Degree, unit: DEG C, it is determined by step (2)；TmTemperature when being initially precipitated for salinized soil crystal salt with high salt, unit: DEG C, by step
(1) it determines；TfFor the solidification point of free body ponding under normal pressure, unit: DEG C, take 0 DEG C.
In step (1)~(5), salinized soil with high salt is the salinized soil of ω >=0.072 s/.
In the step (3), the non-phase transformation cumulative water-oil ratio w of crystallization salinized soil with high salt when salting outu1Contain for the non-phase transformation of salinized soil
The ratio of water and salinized soil natural moisture content.
In the step (3), T=TfWhen salinized soil with high salt non-phase transformation cumulative water-oil ratio ζ=w0/w。
In the step (4), when ice water phase transformation, salinized soil with high salt did not froze cumulative water-oil ratio wu2Do not freeze for salinized soil water content with
Salinized soil is in T=TfWhen water content ratio.
Embodiment:
A certain high-speed railway subgrade engineering is built on brining ground foundation, during railway prospecting, need to determine salt marsh soil
Salt-frost-heave force of base different depth is now determined using the method for the present invention.Specific step is as follows:
(1) by field sampling and laboratory soil test, natural moisture content w, porosity n, the pool of salinized soil with high salt are determined
Pine ratio υ and salt content s；Determine the compression strength E of salinized soil with high saltc, unit: kPa；Determine that salinized soil crystal salt with high salt is initial
Temperature T when precipitationm, unit: DEG C；Determine T=TfSalinized soil water content w with high salt at=0 DEG C0, the results are shown in Table 1, table 2.
As shown in Table 2, ω=0.641 > 0.072 s/, therefore the brining ground foundation is salinized soil with high salt.
(2) by live in-situ test, the minimum temperature T that salinized soil with high salt occurs during cooling is determined, unit: DEG C,
It the results are shown in Table 1, table 2.
(3) the non-phase transformation cumulative water-oil ratio w of salinized soil with high salt when determining that crystallization salts out by following formulau1
The M when calculating10.03 is taken, salinized soil w with high saltu1Determination process the results are shown in Table 1.
(4) do not freeze cumulative water-oil ratio w by what following formula determined salinized soil with high salt when ice water phase transformationu2
The M when calculating20.05 is taken, salinized soil w with high saltu2Determination process the results are shown in Table 1.
The salinized soil w with high salt of table 1u1、wu2Calculating process
| Ground depth/m | Tf/℃ | Tm/℃ | T/℃ | w | w0 | ζ | wu1 | wu2 |
| 0 | 0 | 20 | -10 | 0.064 | 0.0294 | 0.46 | 0.460 | 0.607 |
| 0.5 | 0 | 20 | -5 | 0.064 | 0.0294 | 0.46 | 0.460 | 0.779 |
| 1.5 | 0 | 20 | -1 | 0.064 | 0.0294 | 0.46 | 0.460 | 0.951 |
| 2.5 | 0 | 20 | 5 | 0.064 | 0.0294 | 0.46 | 0.534 | 1.000 |
(5) salt marsh earth salt-frost-heave force σ with high salt is determined by following formulae:
The salt of salinized soil with high salt-frost-heave force σeCalculating process and it the results are shown in Table 2.
Salt marsh earth salt-frost-heave force the calculating process with high salt of table 2
A kind of salt marsh earth salt-frost-heave force with high salt provided by the invention determines method, is suitable for salinized soil region salt-frost heave
Power determines, provides reference frame for high-speed railway or the design of highway Salty Soil Subgrade and basement process, this method implementing procedure is clear
Clear, easy operation, operability are stronger, meet engineering investigation needs, have broad popularization and application prospect.
The above only illustrates that a kind of salt marsh earth salt-frost-heave force with high salt of the present invention determines some principles of method, not
Be the present invention is confined to shown in and the specific method and the scope of application in, therefore all phases that may be utilized
It should modify, belong to the applied the scope of the patents of the present invention.
Claims (5)
1. a kind of salt marsh earth salt-frost-heave force with high salt determines method, comprising the following steps:
(1) by field sampling and laboratory soil test, natural moisture content w, porosity n, the Poisson's ratio υ of salinized soil with high salt are determined
And salt content s；Determine the compression strength E of salinized soil with high saltc, unit: kPa；When determining that salinized soil crystal salt with high salt is initially precipitated
Temperature Tm, unit: DEG C；Determine T=TfSalinized soil water content w with high salt at=0 DEG C0；
(2) by live in-situ test, the minimum temperature T that salinized soil with high salt occurs during cooling is determined, unit: DEG C；
(3) the non-phase transformation cumulative water-oil ratio w of salinized soil with high salt when determining that crystallization salts out by following formulau1:
In formula, wu1The non-phase transformation cumulative water-oil ratio of salinized soil with high salt when being salted out to crystallize；M1Salinized soil with high salt when being salted out for crystallization
Porosity distribution parameter, unit: DEG C-1, take 0.01~0.05 DEG C-1；T is that salinized soil with high salt occurs most during cooling
Low temperature, unit: DEG C, it is determined by step (2)；TmTemperature when being initially precipitated for salinized soil crystal salt with high salt, unit: DEG C, by step
Suddenly (1) determines；TfFor the solidification point of free body ponding under normal pressure, unit: DEG C, take 0 DEG C；ζ is T=TfWhen salinized soil with high salt
Non- phase transformation cumulative water-oil ratio；
(4) do not freeze cumulative water-oil ratio w by what following formula determined salinized soil with high salt when ice water phase transformationu2:
In formula, wu2Salinized soil with high salt does not freeze cumulative water-oil ratio when for ice water phase transformation；M2The hole of salinized soil with high salt when for ice water phase transformation
Distribution characteristics parameter, unit: DEG C-1, take 0.03~0.10 DEG C-1；T is the minimum temperature that salinized soil with high salt occurs during cooling,
Unit: DEG C, it is determined by step (2)；TmTemperature when being initially precipitated for salinized soil crystal salt with high salt, unit: DEG C, it is true by step (1)
It is fixed；TfFor the solidification point of free body ponding under normal pressure, unit: DEG C, take 0 DEG C；
(5) salt marsh earth salt-frost-heave force σ with high salt is determined by following formulae:
In formula, σeFor salt marsh earth salt-frost-heave force with high salt, unit: kPa；S is salinized soil salt content with high salt, is determined by step (1)；w
For salinized soil natural moisture content with high salt, determined by step (1)；N is salinized soil porosity with high salt, is determined by step (1)；EcFor height
Salt salinized soil compression strength, unit: kPa is determined by step (1)；υ is salinized soil Poisson's ratio with high salt, is determined by step (1)；wu1
The non-phase transformation cumulative water-oil ratio of salinized soil with high salt when salting out to crystallize, is determined by step (3)；wu2Salinized soil with high salt when for ice water phase transformation
Do not freeze cumulative water-oil ratio, by step (4) determine；The minimum temperature that T occurs during cooling for salinized soil with high salt, unit: DEG C, by step
Suddenly (2) determine；TmTemperature when being initially precipitated for salinized soil crystal salt with high salt, unit: DEG C, it is determined by step (1)；TfFor under normal pressure
The solidification point of free body ponding, unit: DEG C, take 0 DEG C.
2. a kind of salt marsh earth salt-frost-heave force with high salt as described in claim 1 determines method, it is characterised in that: the step (1)
In~(5), salinized soil with high salt is the salinized soil of ω >=0.072 s/.
3. a kind of salt marsh earth salt-frost-heave force with high salt as described in claim 1 determines method, it is characterised in that: the step (3)
In, the non-phase transformation cumulative water-oil ratio w of crystallization salinized soil with high salt when salting outu1It is natural aqueous for the non-phase transformation water content of salinized soil and salinized soil
The ratio of amount.
4. a kind of salt marsh earth salt-frost-heave force with high salt as described in claim 1 determines method, it is characterised in that: the step (3)
In, T=TfWhen salinized soil with high salt non-phase transformation cumulative water-oil ratio ζ=w0/w。
5. a kind of salt marsh earth salt-frost-heave force with high salt as described in claim 1 determines method, it is characterised in that: the step (4)
In, when ice water phase transformation, salinized soil with high salt did not froze cumulative water-oil ratio wu2Water content and salinized soil are not frozen for salinized soil in T=TfShi Hanshui
The ratio of amount.
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Cited By (1)
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| CN114184735A (en) * | 2021-10-12 | 2022-03-15 | 兰州大学 | Combined measurement method capable of distinguishing frozen swelling capacity and salt swelling capacity of saline soil |
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