CN108982328B - A kind of method that rock pore volume deforms under calculating unfreezing - Google Patents
A kind of method that rock pore volume deforms under calculating unfreezing Download PDFInfo
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- CN108982328B CN108982328B CN201810925022.7A CN201810925022A CN108982328B CN 108982328 B CN108982328 B CN 108982328B CN 201810925022 A CN201810925022 A CN 201810925022A CN 108982328 B CN108982328 B CN 108982328B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
Abstract
The invention discloses the methods that rock pore volume under a kind of calculating unfreezing deforms.This method tests the porosity of rock first with low-field nuclear magnetic resonance measuring technology, and calculates the total pore volume of rock, then tests the tensile strength of rock and the bulk modulus of ice, obtains the bulk modulus of ice at a temperature of the size and the freeze thawing of frost-heave force；The volume change for becoming the phase transition process of ice according to water in hole is individually saturated under cold service, establish the computation model that rock pore volume deforms under unfreezing, obtained parameter is finally updated to established computation model, can be obtained the pore deformation that single freezes rear rock.The present invention overcomes in Traditional calculating methods, the volume of water fully charge is difficult to the problem of calculating in blowhole under unfreezing, and calculates freeze thawing front and back rock sample pore volume elastoplasticity volume accounting using the calculation method.
Description
Technical field
The invention belongs to Geotechnical Engineering fields, and in particular to a kind of lower rock pore volume of calculating Frozen-thawed cycled effect
The method of deformation.
Background technique
There is a large amount of irregular, holes across scale, these holes to directly affect macroscopical object of rock for rock interior
Reason, mechanics and chemical property.For Han Quyan (soil) stone by freeze thawing function influence, process is existing along with many mechanics, physics, chemistry
As.During Frozen-thawed cycled repeatedly, the fine sight defect of rock interior constantly develops, and forms macroscopic cracking, causes rock
The deterioration of (soil) mechanics performance, and then cause the freeze-thaw weathering of rock side slope, peel off so that come down, roadbed and building lot freeze
The freezing-thawing disasters such as swollen lifting and thaw subsidence.Therefore, the deformation of blowhole under unfreezing is analyzed, it can be under unfreezing
The internal injury analysis of rock provides basis, facilitates the mechanism for disclosing freezing-thawing damage, further mentions for the prevention and treatment of freezing-thawing disaster
For theoretical foundation.
Rock pore structure changing rule and extended attribute under unfreezing are reported currently, being fruitful.Liu Quansheng
Deng in text " rock mass freeze thawing Fatigue Damage Model and evaluation index research ", (Liu Quansheng, Huang Shibing, Kang Yongshui wait rock mass freeze thawing tired
Strain wound model and evaluation index research [J] Chinese Journal of Rock Mechanics and Engineering, 2015,34 (6): 1116-1127) in, it is based on three
Rock mass freeze thawing Fatigue Damage Model is established to equivalent tensile stress, in conjunction with the definition of dynamic modulus of elasticity, establishes consideration porosity
With the unified damage variable of P wave velocity of wave, freeze thawing Fatigue Damage Model and evaluation method are obtained；In text, " freeze thawing follows Jia Hailiang etc.
The lower saturation sandstone damage propatagtion model research of ring effect " (Jia Hailiang, Liu Qingbing, Xiang Wei wait Frozen-thawed cycled to act on lower saturated sand
Rock damage propatagtion model study [J] Chinese Journal of Rock Mechanics and Engineering, 2013,32 (supplementary issues 2): 3049-3055) in sandstone is frozen
Melt ringing and be considered as low-cycle fatigue load, based on fatigue damage theory is uniaxially stretched, using the variation of porosity as damage criterion
Sandstone Frozen-thawed cycled damage evolution equation is established, has obtained damage propatagtion rule of the reflection saturation sandstone under Frozen-thawed cycled effect
Rule.But, it has been disclosed that research achievement in lack the analysis that calculates hole cubic deformation, thus can not accurately calculate freeze thawing
Act on the deformation values of lower rock pore volume.
Summary of the invention
The application aims to solve at least one of the technical problems existing in the prior art.For this purpose, an object of the present invention
It is to provide a kind of method for calculating rock pore volume deformation under unfreezing.The method overcome in Traditional calculating methods,
The volume of water fully charge is difficult to the problem of calculating in blowhole under unfreezing.
To overcome above-mentioned technical problem, the present invention adopts the following technical scheme:
A kind of method that rock pore volume deforms under calculating unfreezing, includes the following steps:
Step 1: obtaining the formal parameter of rock sample, calculate the volume of rock sample；
Step 2: the full water process of vacuum is carried out to rock sample；
Step 3: testing out the initial porosity of rock sample；
Step 4: the total pore volume of rock sample is calculated according to the volume of rock sample and initial porosity；
Step 5: Brazilian spilt test being carried out to the rock sample after unfreezing, obtains tensile strength values, and by tension
Intensity value is converted into frost-heave force；
Step 6: the bulk modulus of ice when carrying out freeze thawing temperature measures；
Step 7: above-mentioned parameters obtained being substituted into formula (1), the hole totality that single freezes rear rock sample can be obtained
Product,
Wherein: V is the total pore volume after rock sample pore water freezes；
For the volume of rock sample；
η0For initial porosity；
P is frost-heave force；
α0For the coefficient of cubical expansion of the water under unconfined condition, after water freezing；
K (P) is the bulk modulus of ice when confining pressure is frost-heave force P；
The total pore volume that the single being calculated in above-mentioned formula (1) freezes rear rock sample is subtracted into rock sample
The deformation values that single freezes rear rock pore volume can be obtained in initial total pore volume.
Further, the initial porosity is measured using low-field nuclear magnetic resonance test equipment.
Further, the coefficient of cubical expansion is 9.06%.
Further, the formal parameter is obtained by miking.
Further, the full water process of vacuum, specific operation process are as follows: use vacuum saturation device pair are carried out to rock sample
Rock sample is saturated, vacuum pressure value 0.1MPa, and sample is put into distilled water again after exhausting and impregnates by pumpdown time 4h
24h。
This method tests the porosity of rock first with low-field nuclear magnetic resonance measuring technology, and calculates the hole of rock
Then total volume tests the tensile strength of rock and the bulk modulus of ice, obtain ice at a temperature of the size and the freeze thawing of frost-heave force
Bulk modulus；Do not considering the phase-state change in conjunction with water and capillary water, and the lesser condition of ratio for accounting for entire pore volume
Under, in conjunction with Elasticity and thermodynamic argument, according to the phase transition process for being individually saturated water in hole under cold service and becoming ice
Volume change establishes the computation model that rock pore volume deforms under unfreezing, is finally updated to obtained parameter and is built
Vertical computation model, can be obtained the pore deformation that single freezes rear rock, provide theoretical foundation for study of rocks freezing-thawing damage.
Compared with prior art, the beneficial effects of the present invention are: overcome in Traditional calculating methods, rock under unfreezing
The volume of water fully charge is difficult to the problem of calculating in stone hole；Rock tries before and after calculating freeze thawing using the calculation method simultaneously
Sample pore volume elastoplasticity volume accounting.Technical solution of the present invention can apply under unfreezing, before and after hole water freezing
Volume change calculate.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
Below in conjunction with attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.Obviously described
Embodiment be only preferred examples of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
Referring to Fig. 1, a method of it calculating rock pore volume under unfreezing and deforms, include the following steps:
(1) outer dimension (such as length, diameter parameter) of miking rock sample is utilized, as shown in table 1.
The volume of rock sample is calculated according to above-mentioned parameter are as follows:
(2) the full water process of vacuum, specific operation process are carried out to rock sample are as follows:
Rock sample is saturated using vacuum saturation device, vacuum pressure value 0.1MPa, pumpdown time 4h, after exhausting
Sample is put into distilled water again and is impregnated for 24 hours.
(3) rock sample is tested using low-field nuclear magnetic resonance instrument, obtains the initial porosity of rock sample are as follows: η0
=6.82.%
(4) according to porosity calculation formula, the total pore volume of rock sample can be calculated are as follows:
(5) Brazilian spilt test is carried out to the rock sample after unfreezing, obtains its tensile strength values, and by tensile strength values
It is converted into frost-heave force, the tensile strength sigma of rock in embodimentt=5.23MPa, therefore frost-heave force size P also takes 5.23MPa.
(6) bulk modulus of ice when carrying out different freeze thawing temperature measures.
Under different temperatures the bulk modulus numerical value of ice can refer to Guo Yao et al. text " ultrasonic test of ice mechanics parameter is ground
Study carefully " (Guo Yao, Li Gang, Jia Chengyan wait the ultrasonic test of ice mechanics parameter to study [J] polar research, 2016,28 (1):
It is in 152-157.) as a result, and using this replace confining pressure as frost-heave force P under the bulk modulus of ice can also carry out phase as shown in table 2
The bulk modulus of ice when the mechanical test test freeze thawing temperature answered.
The bulk modulus of ice under 2 different temperatures of table
Freeze thawing temperature in embodiment is -30 DEG C, therefore the bulk modulus of ice takes 8.77GPa.
(7) above-mentioned parameter is substituted into pore volume calculation formula of the saturated rock under single unfreezing, list can be found out
The secondary total pore volume for freezing rear rock sample
In formula: V is the total pore volume after rock sample pore water freezes；
For the volume of rock sample；
η0The initial porosity tested out for Nuclear Magnetic Resonance；
P is frost-heave force；
α0It is water under unconfined condition, the coefficient of cubical expansion after water freezing takes 9.06%；
K (P) is the bulk modulus of ice when confining pressure is frost-heave force P.
The total pore volume that the single being calculated in above-mentioned formula (1) freezes rear rock sample is subtracted into rock sample
The deformation values that single freezes rear rock pore volume can be obtained in initial total pore volume.
Above-described embodiment is only to clearly demonstrate examples made by the present invention, rather than the restriction to embodiment.For
For those of ordinary skill in the art, other various forms of variations or change can also be made on the basis of the above description
It is dynamic.Here without can not be also exhaustive to all embodiments.And the obvious variation or change thus amplified out
It is dynamic to be still in the protection scope of this invention.
Claims (5)
1. a kind of calculate the method that rock pore volume deforms under unfreezing, which comprises the steps of:
Step 1: obtaining the formal parameter of rock sample, calculate the volume of rock sample；
Step 2: the full water process of vacuum is carried out to rock sample；
Step 3: testing out the initial porosity of rock sample；
Step 4: the total pore volume of rock sample is calculated according to the volume of rock sample and initial porosity；
Step 5: Brazilian spilt test being carried out to the rock sample after unfreezing, obtains tensile strength values, and by tensile strength
Value is converted into frost-heave force；
Step 6: the bulk modulus of ice when carrying out freeze thawing temperature measures；
Step 7: above-mentioned parameters obtained is substituted into formula (1), the total pore volume that single freezes rear rock sample can be obtained,
Wherein: V is the total pore volume after rock sample pore water freezes；
For the volume of rock sample；
η0For initial porosity；
P is frost-heave force；
α0For the coefficient of cubical expansion of the water under unconfined condition, after water freezing；
K (P) is the bulk modulus of ice when confining pressure is frost-heave force P；
The total pore volume that the single being calculated in above-mentioned formula (1) freezes rear rock sample is subtracted into the initial of rock sample
The deformation values that single freezes rear rock pore volume can be obtained in total pore volume.
2. according to claim 1 calculate the method that rock pore volume deforms under unfreezing, it is characterised in that: described
Initial porosity is measured using low-field nuclear magnetic resonance test equipment.
3. according to claim 1 calculate the method that rock pore volume deforms under unfreezing, it is characterised in that: described
The coefficient of cubical expansion is 9.06%.
4. according to claim 1 calculate the method that rock pore volume deforms under unfreezing, it is characterised in that: described
Formal parameter is obtained by miking.
5. according to claim 1 calculate the method that rock pore volume deforms under unfreezing, it is characterised in that: to rock
Stone sample carries out the full water process of vacuum, specific operation process are as follows: be saturated using vacuum saturation device to rock sample, vacuum pressure
Value is 0.1MPa, and sample is put into distilled water again after exhausting and impregnates for 24 hours by pumpdown time 4h.
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| CN110987662B (en) * | 2019-11-25 | 2022-04-29 | 中南大学 | Method for determining joint shear strength by considering freeze-thaw cycle damage |
| CN111551638B (en) * | 2020-05-06 | 2022-08-16 | 武汉科技大学 | Method for measuring freeze-thaw wave velocity and deformation of low-temperature saturated rock in real time |
| CN111695283A (en) * | 2020-06-15 | 2020-09-22 | 成都理工大学 | Method for obtaining microscopic deterioration mechanism of England rock in freeze-thaw cycle process |
| CN112287612B (en) * | 2020-10-20 | 2021-11-30 | 长安大学 | Water-rich rock freezing-thawing cycle particle flow numerical simulation method |
| CN112505095A (en) * | 2020-12-11 | 2021-03-16 | 浙江省工程勘察设计院集团有限公司 | Rock freeze-thaw cycle duration measuring method based on core drilling |
| CN116935983B (en) * | 2023-02-25 | 2024-04-12 | 长安大学 | Prediction method for rock physical and mechanical property attenuation degree after freeze thawing |
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