CN110361312A - The determination method of permeability and porosity relationship during rock seepage liquefaction - Google Patents
The determination method of permeability and porosity relationship during rock seepage liquefaction Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 149
- 230000035699 permeability Effects 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 230000003204 osmotic effect Effects 0.000 claims abstract description 9
- 238000002474 experimental method Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 11
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 239000012153 distilled water Substances 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 238000001764 infiltration Methods 0.000 claims description 4
- 230000008595 infiltration Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 13
- 230000007246 mechanism Effects 0.000 abstract description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000012010 growth Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003698 anagen phase Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
- G01N15/0893—Investigating volume, surface area, size or distribution of pores; Porosimetry by measuring weight or volume of sorbed fluid, e.g. B.E.T. method
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
- G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The present invention discloses a kind of determination method of permeability and porosity relationship during rock seepage liquefaction, includes the following steps: that (1) chooses rock sample, tests its initial porosity；(2) rock sample is placed in rock triaxial rheological experiment device, applies confining pressure and osmotic pressure, tests its original permeability；(3) axial load is applied to rock sample, carries out the experiment of three axis seepage liquefaction of rock, until rock sample destroys, record the Parameters variation of rock sample in experimentation；(4) permeability and bulk strain are calculated, the relation curve of permeability and bulk strain is obtained；(5) porosity change of rock sample is calculated；(6) relationship of seepage flow rate and porosity during seepage liquefaction is established.This method is from rock volume strain, obtain the Evolution of porosity, and then connect seepage field during rock seepage liquefaction and stress field, there is reference value for the understanding of rock seepage liquefaction mechanism, the foundation of seepage liquefaction model.
Description
Technical field
The present invention relates to a kind of determination method of permeability and porosity relationship, in particular to a kind of rock seepage stress coupling
The determination method of permeability and porosity relationship, belongs to geotechnical engineering field during conjunction.
Background technique
Engineering rock mass preservation is under groundwater environment, and rock mass is by the effect of being intercoupled of complicated stress field and seepage field.
Seepage liquefaction characteristic of the rock under external load be often substantially extensive Rock Failure destroy and geological disaster it is main
Reason.Seepage liquefaction mechanism is sought, rock seepage liquefaction model is established, is applied to engineering practice, is had very heavy
The engineering value and scientific meaning wanted.
During rock seepage liquefaction, permeability and porosity are two crucial parameters.Porosity is connection
Bridge between stress field and seepage field.Laboratory test is to recognize an effective approach of rock behavio(u)r, and how to be based on examination
Research is tested, the relationship between permeability and porosity is established, is the hot issue of a research.At present about permeability and hole
The determination method of rate relationship is seldom, and the relationship primarily directed to the two in the quiescent state, and during rock seepage liquefaction
It is the process of a dynamic change inside rock sample, is not used to two in dynamic process based on the determination method of both sides relation under static state
Therefore the determination of person's relationship lacks the determination method of dynamic lower permeability and porosity relationship at present.
Summary of the invention
Goal of the invention: aiming at the problems existing in the prior art, the present invention provides a kind of rock seepage liquefaction process
The determination method of middle permeability and porosity relationship.
Technical solution: permeability and porosity relationship be really during a kind of rock seepage liquefaction of the present invention
Determine method, includes the following steps:
(1) rock sample for needing survey region is chosen, its initial porosity is tested；
(2) rock sample is placed in rock triaxial rheological experiment device, applies confining pressure and osmotic pressure, tests its original permeability；
(3) axial load is applied to rock sample, carries out the experiment of three axis seepage liquefaction of rock, until rock sample destroys, test
The water flow that stress, axial strain, hoop strain and the per moment of record rock sample pass through rock sample in the process；
(4) permeability and bulk strain that per moment during rock sample seepage liquefaction is calculated according to record value, obtain
The relation curve of permeability and bulk strain during this；
(5) porosity of rock sample during this is calculated according to the bulk strain value during rock sample seepage liquefaction；
(6) relationship of seepage flow rate and porosity during seepage liquefaction is established.
In above-mentioned steps (1), the initial porosity of rock sample can be measured by saturated test, test method are as follows: first weigh rock
Then rock sample is dried, obtains its dry weight, is subsequently placed into dry tap in vacuum pumping tank, then slowly infuse by the initial weight of sample
Enter distilled water, makes the full water weight of weighing rock sample after the sufficiently full water of rock sample；The initial porosity n of rock sample is calculated according to the following formula0:
Wherein, msAnd mdThe respectively saturated weight and dry weight of rock sample, ρwFor the density of water, VpIt is respectively rock sample with V
Pore volume and total volume.
In above-mentioned steps (2), the original permeability test process of rock sample are as follows: confining pressure and osmotic pressure are continuously applied, to rock sample two
After end forms stable seepage field, by the water flow of rock sample in record unit time, rock is calculated based on Darcy's law
The original permeability of sample.
In above-mentioned steps (4), the infiltration at per moment during rock sample seepage liquefaction can be calculated according to Darcy's law
Saturating rate obtains the bulk strain of rock sample according to axial strain and hoop strain.Rock sample is during seepage liquefaction, permeability
Experience starts to gradually become smaller, rear to stablize fluctuation, last steady growth stage；Bulk strain is using volume dilatation point as boundary, experience pressure
Contracting and two stages of dilatation.With the boundary of volume dilatation point, the variation of permeability can be divided into 2 stages.
Preferably, in step (5), the porosity of rock sample and the relationship of bulk strain meet following formula:
In formula, ni+1And niRespectively rock sample is in ti+1And tiMoment corresponding porosity, Δ εvFor this corresponding time interval
The bulk strain changing value of interior rock sample.As can be seen that rock, during seepage liquefaction, porosity is a dynamic change
Change process, it is closely related with the porosity of previous moment and bulk strain.
Specifically, using volume dilatation point as separation, the variation of permeability and porosity is divided into 2 ranks in step (6)
Section, is fitted stage by stage, obtains the relational expression of permeability and porosity, fitting formula are as follows:
In above formula, k and n are permeability and porosity, k0And n0For original permeability and initial porosity, a, b, m are fitting
Parameter.Wherein, volume dilatation point is the plastic deformation point of rock sample, corresponds to permeability and bulk strain pass that step (4) obtain
It is the inflection point in curve.
The utility model has the advantages that compared with the prior art, the advantages of the present invention are as follows: the present invention is based on the examinations of indoor seepage liquefaction
It tests result and provides a kind of determination method of permeability and porosity relationship in dynamic process, this method is with rock volume strain
Bridge first establishes the relationship of bulk strain and permeability, and the change of porosity is calculated by the changing rule of bulk strain
The variation of permeability and porosity is carried out divided stages, utilizes Function Fitting by law then using volume dilatation point as boundary's point
Stage by stage determine rock seepage liquefaction during permeability and porosity relational expression；This method is by establishing infiltration
The relationship of rate and porosity connects seepage field during rock seepage liquefaction and stress field, for rock seepage flow
The understanding of stress coupling mechanism, the foundation of seepage liquefaction model have practical engineering value.
Detailed description of the invention
Fig. 1 is hoop strain, axial strain, stress and the infiltration of rock sample during rock seepage liquefaction in embodiment
The change curve of rate；
Fig. 2 is bulk strain-stress relation curve and bulk strain-permeability relation curve in embodiment；
Fig. 3 is the change curve of rock sample porosity in embodiment.
Specific embodiment
Technical solution of the present invention is described further with reference to the accompanying drawing.
The determination method of permeability and porosity relationship during rock seepage liquefaction of the invention, from rock volume
Strain is set out, and obtains the Evolution of porosity, and then seepage field during rock seepage liquefaction is connected with stress field
Get up, there is reference value for the understanding of rock seepage liquefaction mechanism, the foundation of seepage liquefaction model.
This method specifically comprises the following steps:
(1) rock sample for needing survey region is chosen, its initial porosity is tested；
Tested by saturated test, method are as follows: first weigh the initial weight of rock sample, then by rock sample drying, obtain it and do
Dry weight is subsequently placed into dry tap in vacuum pumping tank, then slowly injects distilled water, weighs the full of rock sample after making the sufficiently full water of rock sample
Water weight；The initial porosity n of rock sample is calculated according to the following formula0:
Wherein, msAnd mdThe respectively saturated weight and dry weight of rock sample, ρwFor the density of water, VpIt is respectively rock sample with V
Pore volume and total volume.
(2) rock sample is placed in rock triaxial rheological experiment device, applies confining pressure and osmotic pressure, tests its original permeability；
It is continuously applied confining pressure and osmotic pressure, after stable seepage field is formd after rock sample both ends, is passed through in record unit time
The original permeability of rock sample is calculated based on Darcy's law for the water flow of rock sample.
(3) axial load is applied to rock sample, carries out the experiment of three axis seepage liquefaction of rock, until rock sample destroys, test
The water flow that stress, axial strain, hoop strain and the per moment of record rock sample pass through rock sample in the process；
(4) permeability and bulk strain that per moment during rock sample seepage liquefaction is calculated according to record value, obtain
The relation curve of permeability and bulk strain during this；
The permeability at per moment during rock sample seepage liquefaction is calculated according to Darcy's law, according to axial strain
The bulk strain of rock sample is obtained with hoop strain.During seepage liquefaction, permeability experience starts to gradually become smaller rock sample,
Stable fluctuation afterwards, last steady growth stage；Bulk strain is using volume dilatation point as boundary, experience compression and two stages of dilatation.
With the boundary of volume dilatation point, the variation of permeability can be divided into 2 stages.
(5) porosity of rock sample during this is calculated according to the bulk strain value during rock sample seepage liquefaction；
The porosity of rock sample and the relationship of bulk strain are as follows:
In formula, ni+1And niRespectively rock sample is in ti+1And tiMoment corresponding porosity, Δ εvFor this corresponding time interval
The bulk strain changing value of interior rock sample.As can be seen that rock, during seepage liquefaction, porosity is a dynamic change
Change process, it is closely related with the porosity of previous moment and bulk strain.
(6) relationship of seepage flow rate and porosity during seepage liquefaction is established.
Using volume dilatation point as separation, the variation of permeability and porosity is divided into 2 stages, is intended stage by stage
It closes, obtains the relational expression of permeability and porosity, fitting formula are as follows:
In above formula, k and n are permeability and porosity, k0And n0For original permeability and initial porosity, a, b, m are fitting
Parameter.Wherein, volume dilatation point is the plastic deformation point of rock sample, corresponds to permeability and bulk strain pass that step (4) obtain
It is the inflection point in curve.
Embodiment
(1) survey region core sample is taken to be processed into the cylinder sample of a height of 50mm*100mm of diameter *, it is initial that weighing obtains it
Weight is m=414.45g；
(2) rock sample is put into dryer and is dried 8 hours, the dry weight that weighing obtains rock sample is md=408.65g；It puts
Enter dry tap 6 hours in vacuum pumping tank, then slowly inject distilled water, is immersed in rock sample and allows within 24 hours in distilled water it sufficiently full
Water, the rear full water weight m for weighing rock samples=430.43g；
(3) initial porosity of rock sample is calculated
(4) rock sample is put into the full-automatic triaxial rheology servo testing machine of rock, applies confining pressure 6MPa, osmotic pressure 1.5MPa.
Osmotic pressure is kept for 12 hours after applying, and guarantees that rock is in steady seepage state.It penetrates into inside rock sample by stabilization sub stage rock sample
The variation of water, the original permeability for measuring rock sample is k0=1.98 × 10–17。
(5) apply xial feed to rock sample with the rate of 0.02mm/min to destroy.In entire loading procedure, rock is recorded
Axial strain, hoop strain, the variation of stress and water yield, such as Fig. 1.
(6) permeability and bulk strain of rock sample is calculated, obtains the change curve of permeability and bulk strain.
Fig. 1 shows the change curve of permeability, and during seepage liquefaction, rock sample is dropped by compression permeability first
It is low, then there is a stable fluctuation stage, is finally a Fast growth phase.Fig. 2 shows bulk strain with stress
The relation curve of change curve and bulk strain and permeability, it can be seen that seepage liquefaction process, bulk strain experience
Compression and two stages of dilatation, using volume dilatation point as boundary；Wherein, the inflection point (B point) of bulk strain and permeability relation curve
The volume dilatation point of corresponding the present embodiment.
(7) porosity during the entire seepage liquefaction for obtaining rock sample is calculated.The pass of porosity and bulk strain
It is as follows:
With the exemplary relationship of porosity and axial strain, such as Fig. 3, it can be seen from the figure that the porosity of rock sample experienced
It first gradually becomes smaller and is gradually increased two stages afterwards.
(8) relationship of permeability and porosity is established.Using volume dilatation point as boundary's point, by the change of permeability and bulk strain
Two stages are divided into, by being fitted stage by stage, obtain the relationship of permeability and porosity, expression formula is as follows
Each parametric results that the present embodiment is fitted are as follows, and it is 0.99 that wherein R2, which is the related coefficient of fitting result,
Indicate that fitting result is fine.
Claims (7)
1. a kind of determination method of permeability and porosity relationship during rock seepage liquefaction, which is characterized in that including
Following steps:
(1) rock sample for needing survey region is chosen, its initial porosity is tested；
(2) rock sample is placed in rock triaxial rheological experiment device, applies confining pressure and osmotic pressure, tests its original permeability；
(3) axial load is applied to rock sample, carries out the experiment of three axis seepage liquefaction of rock, until rock sample destroys, test process
The water flow that stress, axial strain, hoop strain and the per moment of middle record rock sample pass through rock sample；
(4) permeability and bulk strain that per moment during rock sample seepage liquefaction is calculated according to record value, obtain the mistake
The relation curve of permeability and bulk strain in journey；
(5) porosity of rock sample during this is calculated according to the bulk strain value during rock sample seepage liquefaction；
(6) relationship of seepage flow rate and porosity during seepage liquefaction is established.
2. the determination method of permeability and porosity relationship during rock seepage liquefaction according to claim 1,
It is characterized in that, the initial porosity of the rock sample is measured by saturated test, test method are as follows: first weighs rock in step (1)
Then rock sample is dried, obtains its dry weight, is subsequently placed into dry tap in vacuum pumping tank, then slowly infuse by the initial weight of sample
Enter distilled water, makes the full water weight of weighing rock sample after the sufficiently full water of rock sample；The initial porosity n of rock sample is calculated according to the following formula0:
Wherein, msAnd mdThe respectively saturated weight and dry weight of rock sample, ρwFor the density of water, VpIt is respectively the hole of rock sample with V
Gap volume and total volume.
3. the determination method of permeability and porosity relationship during rock seepage liquefaction according to claim 1,
It is characterized in that, it is continuously applied confining pressure and osmotic pressure in step (2), and after stable seepage field is formd after rock sample both ends, record
By the water flow of rock sample in the time of position, the original permeability of rock sample is calculated based on Darcy's law.
4. the determination method of permeability and porosity relationship during rock seepage liquefaction according to claim 1,
It is characterized in that, the infiltration at per moment during rock sample seepage liquefaction is calculated according to Darcy's law in step (4)
Rate obtains the bulk strain of rock sample according to axial strain and hoop strain.
5. the determination method of permeability and porosity relationship during rock seepage liquefaction according to claim 1,
It is characterized in that, the porosity of rock sample and the relationship of bulk strain meet following formula in step (5):
In formula, ni+1And niRespectively rock sample is in ti+1And tiMoment corresponding porosity, Δ εvFor rock in this corresponding time interval
The bulk strain changing value of sample.
6. the determination method of permeability and porosity relationship during rock seepage liquefaction according to claim 1,
It is characterized in that, using volume dilatation point as separation, the variation of permeability and porosity is divided into 2 stages in step (6),
It is fitted stage by stage, obtains the relational expression of permeability and porosity, fitting formula are as follows:
Wherein, k and n is permeability and porosity, k0And n0For original permeability and initial porosity, a, b, m are fitting parameter.
7. the determination method of permeability and porosity relationship during rock seepage liquefaction according to claim 6,
It is characterized in that, the volume dilatation point is the plastic deformation point of rock sample, the volume dilatation point correspond in step (4) permeability and
Inflection point in bulk strain relation curve.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110940610A (en) * | 2019-11-27 | 2020-03-31 | 山东科技大学 | Broken rock nonlinear seepage test system and method |
| CN111707531A (en) * | 2020-06-19 | 2020-09-25 | 河海大学 | Test method for complex seepage stress coupling loading path |
| CN111753414A (en) * | 2020-06-16 | 2020-10-09 | 河海大学 | Seepage characteristic simulation method for rock progressive destruction process based on non-Darcy law |
| CN112082922A (en) * | 2020-09-18 | 2020-12-15 | 西南石油大学 | Method for determining seepage permeability of large rectangular flat model rock sample plane |
| CN113221417A (en) * | 2021-05-14 | 2021-08-06 | 湖北理工学院 | Virtual triaxial penetration test simulation method based on discrete-continuous coupling and lattice Boltzmann |
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