CN107179393A - A kind of pore water pressure force test method of the fine and close rock soil medium of low water content - Google Patents
A kind of pore water pressure force test method of the fine and close rock soil medium of low water content Download PDFInfo
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Abstract
Include the present invention relates to a kind of pore water pressure force test method of the fine and close rock soil medium of low water content：The relative humidity of the ground sample of low water content is measured, the first equation of equilibrium is determined according to chemical potential equilibrium principle；Second expression formula is determined according to the relation of the true pore water pressure of the first expression formula and current state and the pore water pressure of measurement；Pore water in ground sample, which is removed, turns into balance solution, measures the relative humidity of balance solution, the second equation of equilibrium is determined according to chemical potential equilibrium principle；Second expression formula and the 3rd expression formula joint account are gone out to the pore water pressure of measurement.The pore water pressure force test method operating method is easy and effective, and the pore water pressure of the rock soil medium of low water content can be accurately obtained in the short period of time.
Description
Technical field
The present invention relates to soil test technique field, the pore water pressure of more particularly to a kind of fine and close rock soil medium of low water content
Force test method.
Background technology
In vast arid and semi-arid lands, most of is all unsaturated soil, and substantial amounts of geological disaster and non-full
It is relevant with soil.Different from saturated soil, unsaturated soil is three-phase porous media, includes solid phase, gas phase and liquid phase.Due to depositing for gas phase
So that the pore water pressure in unsaturated soil is negative value.
When water content is higher, the negative pore pressure in unsaturated soil is measured using tensometer method.Enter one with water content
Step reduction, pore water pressure becomes increasingly to bear.Now soil body reclaimed water office is in adsorbed state, it is impossible to so that measuring instrument and soil
Water connection in sample.In this state, tensometer is no longer applicable, and can only be obtained by indirect method.It is general most normal
It is that the pore water pressure in the soil body is obtained using relative humidity method indirectly, this method is by chemical potential equilibrium principle
Measurement, i.e., the water potential energy of each point is equal in test system and the soil body.That is, the relative humidity of measurement is converted into soil
Pore water pressure.And this method have ignored chemical potential caused by the concentration of pore solution and reduce, i.e. the change of relative humidity.
The total potential energy measured is considered to the pore water pressure of soil.
Unsaturated rockmass is a kind of typical heterogeneous multi component pore media, and its solid skeletal and the hole aqueous solution are general
Electric charge and ion with different prices.Under artificial disturbance or natural conditions change, along with the change of water content in the soil body,
The concentration and component of pore solution change.Simultaneously because clay particle surface typically carries negative electrical charge, due to Donnan effects
Should, the concentration of balance solution and differed in the hole aqueous solution and measuring system in the soil body, meanwhile, the concentration of balance solution with
The negatively charged density of particle surface is relevant.The hole water potential energy measured by relative humidity method causes comprising solution concentration
Potential energy reduction, but conventional method have ignored solution concentration, be all measured hole pressure by total potential energy etc., and this is inappropriate.
The content of the invention
The invention provides a kind of pore water pressure force test method of the fine and close rock soil medium of low water content, solve or part
Solve pore water pressure force measuring method of the prior art and have ignored potential energy reduction caused by solution concentration, cause pore water pressure
The inaccurate technical problem of power test result, it is easy and effective to realize operating method, can accurately obtain in the short period of time
Obtain the technique effect of the pore water pressure of the rock soil medium of low water content.
A kind of pore water pressure force test method for the fine and close rock soil medium of low water content that the present invention is provided, including：
The relative humidity RH of the ground sample of low water content is measured, determines that the first balance is public according to chemical potential equilibrium principle
Formula；First equation of equilibrium is：
Above-mentioned three formula merges into the first expression formula：
Wherein,For the chemical potential of hydrone in the corresponding gas phase of pore water；For ground sample pore water reclaimed water
Chemical potential；For the chemical potential of gas under reference state；T is temperature；For reference gas pressure, value is atmospheric pressure；R
For gas constant；For the molal weight of hydrone；For the air pressure of current state；For pure water under reference state
Chemical potential, withIt is equal；To refer to water pressure, value is atmospheric pressure；plFor the true pore water pressure of current state；For the density of reference state pure water, it is set as constant；ΩlFor surface potential energy；For the activity of pore water；Described RH etc.
In
According to the true pore water pressure of first expression formula and the current state and the pore water pressure of the measurement
The relation of power determines the second expression formula；
The relation of the true pore water pressure and the pore water pressure of the measurement of the current state is：
Wherein,For the pore water pressure of measurement；
Second expression formula is：
The pore water in the ground sample, which is removed, turns into balance solution, measures the relatively wet of the balance solution
Spend RHR, the second equation of equilibrium is determined according to chemical potential equilibrium principle；Second equation of equilibrium is：
Above-mentioned three formula merges into the 3rd expression formula：
Wherein,For the chemical potential of hydrone in the corresponding gas phase of balance solution；For the change of balance solution reclaimed water
Learn gesture；For the activity of balance solution；
Second expression formula and the 3rd expression formula joint account are gone out to the pore water pressure of the measurement
Preferably, the relative humidity RH of the ground sample of the measurement low water content, including：
The ground sample is put into closed container, it is T to control the temperature in the closed container, makes the ground sample
Product and surrounding air reach balance；
The relative humidity of the closed container is measured by thermocouple psychrometers；
Wherein, the relative humidity of measurement is the relative humidity RH of the ground sample.
Preferably, the pore water by the ground sample, which is removed, turns into balance solution, measure described flat
The relative humidity RH of weighing apparatus solutionR, including：
If the upper and lower ends of the ground sample are put into dry plate filter paper respectively, the ground sample and the filter paper are extruded,
The pore water in the ground sample is pressed out on the filter paper；
All filter paper most middle a piece of filter paper is put into closed container, controlled in the closed container
Temperature is T；
After the air in the filter paper and the closed container reaches poised state, institute is measured by thermocouple psychrometers
State the relative humidity in closed container；
Wherein, the relative humidity of measurement is the relative humidity RH of the balance solutionR。
Preferably, the upper and lower ends of the ground sample are put into 3 filter paper respectively；
The ground sample and the filter paper are extruded by hydraulic jack, the pressure of the hydraulic jack is 100kN.
One or more technical schemes provided herein, have at least the following technical effects or advantages：
As a result of the relative humidity RH of the ground sample of measurement low water content, the is determined according to chemical potential equilibrium principle
One equation of equilibrium, obtains the first expression formula, according to the true pore water of the first expression formula and current state by the first equation of equilibrium
The relation of pressure and the pore water pressure of measurement determines the second expression formula, the pore water in ground sample is removed molten as balancing
Liquid, measures the relative humidity RH of balance solutionR, the second equation of equilibrium is determined according to chemical potential equilibrium principle, it is public by the second balance
Formula obtains the 3rd expression formula, and the second expression formula and the 3rd expression formula joint account are gone out to the pore water pressure of measurement；The test side
Method makes a distinction potential variation caused by the concentration and pressure of pore water, it is to avoid conventional method regard total potential energy as measured hole
The mistaken ideas of gap water pressure.So, efficiently solve pore water pressure force measuring method of the prior art and have ignored solution concentration and draw
The potential energy reduction risen, the technical problem for causing pore water pressure test result inaccurate, it is easy and effective to realize operating method, energy
The technique effect of the pore water pressure of enough rock soil mediums for accurately obtaining low water content in the short period of time.
Brief description of the drawings
Fig. 1 illustrates for the flow of the pore water pressure force test method for the fine and close rock soil medium of low water content that the present invention is provided
Figure.
Embodiment
The embodiment of the present application provides a kind of pore water pressure force test method of the fine and close rock soil medium of low water content, solves
Or part solves pore water pressure force measuring method of the prior art and have ignored potential energy reduction caused by solution concentration, causes hole
The inaccurate technical problem of gap water pressure test result, the relative humidity RH of the ground sample by measuring low water content, according to
Chemical potential equilibrium principle determines the first equation of equilibrium, and the first expression formula is obtained by the first equation of equilibrium, according to the first expression formula and
The relation of the true pore water pressure of current state and the pore water pressure of measurement determines the second expression formula, by ground sample
Pore water, which is removed, turns into balance solution, measures the relative humidity RH of balance solutionR, determine that second is flat according to chemical potential equilibrium principle
Weighed formula, and the 3rd expression formula is obtained by the second equation of equilibrium, and the second expression formula and the 3rd expression formula joint account are gone out into measurement
Pore water pressure, realizes that operating method is easy and effective, and the ground of low water content can be accurately obtained in the short period of time
The technique effect of the pore water pressure of medium.
Referring to accompanying drawing 1, a kind of pore water pressure force test method for the fine and close rock soil medium of low water content that the present invention is provided, bag
Include：
S1:The relative humidity RH of the ground sample of low water content is measured, the first balance is determined according to chemical potential equilibrium principle
Formula；First equation of equilibrium is：
Above-mentioned three formula merges into the first expression formula：
Wherein,For the chemical potential of hydrone in the corresponding gas phase of pore water；For ground sample pore water reclaimed water
Chemical potential；For the chemical potential of gas under reference state；T is temperature；For reference gas pressure, value is atmospheric pressure；R
For gas constant；For the molal weight of hydrone；For the air pressure of current state；For pure water under reference state
Chemical potential, withIt is equal；To refer to water pressure, value is atmospheric pressure；plFor the true pore water pressure of current state；For the density of reference state pure water, it is set as constant；ΩlFor surface potential energy；For the activity of pore water；RH is equal to
S2:The relation of pore water pressure according to the true pore water pressure of the first expression formula and current state with measuring is true
Fixed second expression formula；
The true pore water pressure of current state and the relation of pore water pressure of measurement are：
Wherein,For the pore water pressure of measurement.
Second expression formula is：
S3:Pore water in ground sample, which is removed, turns into balance solution, measures the relative humidity RH of balance solutionR, root
The second equation of equilibrium is determined according to chemical potential equilibrium principle；Second equation of equilibrium is：
Above-mentioned three formula merges into the 3rd expression formula：
Wherein,For the chemical potential of hydrone in the corresponding gas phase of balance solution；For the change of balance solution reclaimed water
Learn gesture；For the activity of balance solution.
S4:Second expression formula and the 3rd expression formula joint account are gone out to the pore water pressure of measurement
Further, the relative humidity RH of the ground sample of measurement low water content, including：
Ground sample is put into closed container, it is T to control the temperature in closed container, makes ground sample and surrounding air
Reach balance；The relative humidity of closed container is measured by thermocouple psychrometers；Wherein, the relative humidity of measurement is ground sample
The relative humidity RH of product.
Further, the pore water in ground sample is removed turns into balance solution, measures the relative humidity of balance solution
RHR, including：
If the upper and lower ends of ground sample are put into dry plate filter paper, extruding ground sample and filter paper respectively, by ground sample
Pore water be pressed out on filter paper；All filter paper most middle a piece of filter paper is put into closed container, in control closed container
Temperature be T；After the air in filter paper and closed container reaches poised state, closed container is measured by thermocouple psychrometers
In relative humidity；Wherein, the relative humidity of measurement is the relative humidity RH of balance solutionR.It is used as a kind of preferred implementation
The upper and lower ends of ground sample are put 3 filter paper by example respectively, and ground sample and filter paper, hydraulic pressure thousand are extruded by hydraulic jack
The pressure on jin top is 100kN.
The method of testing determines low water content rock using the relative humidity of the hole water potential energy peace weighing apparatus solution measured
The pore water pressure of earth sample measurement, this method considers the influence of hole water concentration, and concentration effect is made a distinction with pressure,
Total potential energy is regard as the mistaken ideas of measurement pore water pressure so as to avoid conventional method.This method operating method is easy and effective, energy
The pore water pressure of enough rock soil mediums for accurately obtaining low water content in the short period of time, it is adaptable to Arid＆semi-arid area
The field relevant with unsaturated soil such as the shrinkage cracking of rock soil medium.
One or more technical schemes provided herein, have at least the following technical effects or advantages：
As a result of the relative humidity RH of the ground sample of measurement low water content, the is determined according to chemical potential equilibrium principle
One equation of equilibrium, obtains the first expression formula, according to the true pore water of the first expression formula and current state by the first equation of equilibrium
The relation of pressure and the pore water pressure of measurement determines the second expression formula, the pore water in ground sample is removed molten as balancing
Liquid, measures the relative humidity RH of balance solutionR, the second equation of equilibrium is determined according to chemical potential equilibrium principle, it is public by the second balance
Formula obtains the 3rd expression formula, and the second expression formula and the 3rd expression formula joint account are gone out to the pore water pressure of measurement；The test side
Method makes a distinction potential variation caused by the concentration and pressure of pore water, it is to avoid conventional method regard total potential energy as measured hole
The mistaken ideas of gap water pressure.So, efficiently solve pore water pressure force measuring method of the prior art and have ignored solution concentration and draw
The potential energy reduction risen, the technical problem for causing pore water pressure test result inaccurate, it is easy and effective to realize operating method, energy
The technique effect of the pore water pressure of enough rock soil mediums for accurately obtaining low water content in the short period of time.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not limited to this hair
Bright, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. should be included in the present invention
Protection domain within.
Claims (4)
1. a kind of pore water pressure force test method of the fine and close rock soil medium of low water content, it is characterised in that
The relative humidity RH of the ground sample of low water content is measured, the first equation of equilibrium is determined according to chemical potential equilibrium principle；Institute
Stating the first equation of equilibrium is：
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Gesture, withIt is equal；To refer to water pressure, value is atmospheric pressure；plFor the true pore water pressure of current state；
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According to the true pore water pressure of first expression formula and the current state and the pore water pressure of the measurement
Relation determines the second expression formula；
The relation of the true pore water pressure and the pore water pressure of the measurement of the current state is：
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Wherein,For the pore water pressure of measurement；
Second expression formula is：
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</msubsup>
</mfrac>
<mo>+</mo>
<mfrac>
<mrow>
<mi>R</mi>
<mi>T</mi>
</mrow>
<msub>
<mi>M</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</mfrac>
<mi>ln</mi>
<mi> </mi>
<msubsup>
<mi>a</mi>
<mi>R</mi>
<msub>
<mi>l</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</msubsup>
<mo>;</mo>
</mrow>
The pore water in the ground sample, which is removed, turns into balance solution, measures the relative humidity of the balance solution
RHR, the second equation of equilibrium is determined according to chemical potential equilibrium principle；Second equation of equilibrium is：
<mrow>
<msubsup>
<mi>&mu;</mi>
<mi>R</mi>
<msub>
<mi>g</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</msubsup>
<mo>=</mo>
<msubsup>
<mi>&mu;</mi>
<mi>R</mi>
<msub>
<mi>l</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</msubsup>
<mo>;</mo>
</mrow>
<mrow>
<msubsup>
<mi>&mu;</mi>
<mi>R</mi>
<msub>
<mi>g</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</msubsup>
<mo>=</mo>
<msubsup>
<mi>&mu;</mi>
<mo>&CirclePlus;</mo>
<msub>
<mi>g</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</msubsup>
<mrow>
<mo>(</mo>
<mi>T</mi>
<mo>,</mo>
<msubsup>
<mi>p</mi>
<mn>0</mn>
<mi>g</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mfrac>
<mrow>
<mi>R</mi>
<mi>T</mi>
</mrow>
<msub>
<mi>M</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</mfrac>
<mi>l</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mfrac>
<msubsup>
<mi>p</mi>
<mi>v</mi>
<mi>g</mi>
</msubsup>
<msubsup>
<mi>p</mi>
<mn>0</mn>
<mi>g</mi>
</msubsup>
</mfrac>
<mo>)</mo>
</mrow>
<mo>;</mo>
</mrow>
<mrow>
<msubsup>
<mi>&mu;</mi>
<mi>R</mi>
<msub>
<mi>l</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</msubsup>
<mo>=</mo>
<msubsup>
<mover>
<mi>&mu;</mi>
<mo>~</mo>
</mover>
<mo>&CirclePlus;</mo>
<msub>
<mi>l</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</msubsup>
<mrow>
<mo>(</mo>
<mi>T</mi>
<mo>,</mo>
<msubsup>
<mi>p</mi>
<mn>0</mn>
<mi>l</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mfrac>
<mrow>
<mi>R</mi>
<mi>T</mi>
</mrow>
<msub>
<mi>M</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</mfrac>
<mi>ln</mi>
<mi> </mi>
<msubsup>
<mi>a</mi>
<mi>R</mi>
<msub>
<mi>l</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</msubsup>
<mo>;</mo>
</mrow>
Above-mentioned three formula merges into the 3rd expression formula：
<mrow>
<mfrac>
<mrow>
<mi>R</mi>
<mi>T</mi>
</mrow>
<msub>
<mi>M</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</mfrac>
<mi>ln</mi>
<mi> </mi>
<msub>
<mi>RH</mi>
<mi>R</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mi>R</mi>
<mi>T</mi>
</mrow>
<msub>
<mi>M</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</mfrac>
<mi>ln</mi>
<mi> </mi>
<msubsup>
<mi>a</mi>
<mi>R</mi>
<msub>
<mi>l</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</msubsup>
<mo>;</mo>
</mrow>
Wherein,For the chemical potential of hydrone in the corresponding gas phase of balance solution；For the chemical potential of balance solution reclaimed water；For the activity of balance solution；
Second expression formula and the 3rd expression formula joint account are gone out to the pore water pressure of the measurement
<mrow>
<msubsup>
<mi>p</mi>
<mi>R</mi>
<mi>l</mi>
</msubsup>
<mo>-</mo>
<msubsup>
<mi>p</mi>
<mn>0</mn>
<mi>l</mi>
</msubsup>
<mo>=</mo>
<mfrac>
<mrow>
<msubsup>
<mi>&rho;</mi>
<mo>&CirclePlus;</mo>
<msub>
<mi>l</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</msubsup>
<mi>R</mi>
<mi>T</mi>
</mrow>
<msub>
<mi>M</mi>
<mrow>
<msub>
<mi>H</mi>
<mn>2</mn>
</msub>
<mi>O</mi>
</mrow>
</msub>
</mfrac>
<mrow>
<mo>(</mo>
<mi>ln</mi>
<mi> </mi>
<mi>R</mi>
<mi>H</mi>
<mo>-</mo>
<mi>ln</mi>
<mi> </mi>
<msub>
<mi>RH</mi>
<mi>R</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>.</mo>
</mrow>
2. the pore water pressure force test method of the fine and close rock soil medium of low water content as claimed in claim 1, it is characterised in that institute
The relative humidity RH of the ground sample of measurement low water content is stated, including：
The ground sample is put into closed container, it is T to control temperature in the closed container, make the ground sample and
Surrounding air reaches balance；
The relative humidity of the closed container is measured by thermocouple psychrometers；
Wherein, the relative humidity of measurement is the relative humidity RH of the ground sample.
3. the pore water pressure force test method of the fine and close rock soil medium of low water content as claimed in claim 1, it is characterised in that institute
State to remove the pore water in the ground sample and turn into balance solution, measure the relative humidity RH of the balance solutionR,
Including：
If the upper and lower ends of the ground sample are put into dry plate filter paper respectively, the ground sample and the filter paper are extruded, by institute
The pore water stated in ground sample is pressed out on the filter paper；
All filter paper most middle a piece of filter paper is put into closed container, the temperature in the closed container is controlled
For T；
After the air in the filter paper and the closed container reaches poised state, measure described close by thermocouple psychrometers
The relative humidity closed in container；
Wherein, the relative humidity of measurement is the relative humidity RH of the balance solutionR。
4. the pore water pressure force test method of the fine and close rock soil medium of low water content as claimed in claim 3, it is characterised in that
The upper and lower ends of the ground sample are put into 3 filter paper respectively；
The ground sample and the filter paper are extruded by hydraulic jack, the pressure of the hydraulic jack is 100kN.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916716A (en) * | 2019-02-26 | 2019-06-21 | 西北大学 | A kind of method that quantitative assessment compression is pressurized pore-fluid |
| CN113030438A (en) * | 2021-03-09 | 2021-06-25 | 中国地质大学（武汉） | Method for testing water content and water content of rock-soil body based on thermodynamic equilibrium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251790A (en) * | 2014-10-09 | 2014-12-31 | 中国地质大学（武汉） | Self-water injection type rock and soil sample saturator |
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2017
- 2017-06-19 CN CN201710464892.4A patent/CN107179393B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251790A (en) * | 2014-10-09 | 2014-12-31 | 中国地质大学（武汉） | Self-water injection type rock and soil sample saturator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916716A (en) * | 2019-02-26 | 2019-06-21 | 西北大学 | A kind of method that quantitative assessment compression is pressurized pore-fluid |
| CN109916716B (en) * | 2019-02-26 | 2020-04-17 | 西北大学 | Method for quantitatively evaluating pressurization of pore fluid by pressure stress |
| CN113030438A (en) * | 2021-03-09 | 2021-06-25 | 中国地质大学（武汉） | Method for testing water content and water content of rock-soil body based on thermodynamic equilibrium |
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