CN105973661A - Preparation method of compressive pre-stress artificial rock core - Google Patents
Preparation method of compressive pre-stress artificial rock core Download PDFInfo
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- CN105973661A CN105973661A CN201610270673.8A CN201610270673A CN105973661A CN 105973661 A CN105973661 A CN 105973661A CN 201610270673 A CN201610270673 A CN 201610270673A CN 105973661 A CN105973661 A CN 105973661A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/364—Embedding or analogous mounting of samples using resins, epoxy
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a preparation method of a compressive pre-stress artificial rock core, wherein the method comprises the following steps: (1) mixing and stirring an epoxy resin A component and a curing agent B component; (2), adding quartz sand into the mixture in the step (1), and stirring evenly; and (3) layering and casting the mixture of the step (2) into an internal stress cylindrical mold, coating a layer of a mold release agent between the mold and the mixture, applying pressure to the mixture of the step (2) through a spiral handle, and thus obtaining the internal stress rock core after curing and molding a cylindrical sample.
Description
Technical field
The invention belongs to artificial core preparing technical field, be specifically related to the system of a kind of compressive pre-stress artificial core
Preparation Method.
Background technology
Rock type materials is a kind of non-uniform dielectric, and the microscopic particles of composition rock is at mechanical property and conduction of heat
Aspect of performance all there are difference, under the effect of pressure, temperature variation, can produce the plastic deformation of local,
Part stress is caused to be stored wherein.During rock mechanics and engineering, mining engineering and excavation project etc.,
Often be found for example that rock burst strain energy release, soft-rock tunnel stress relaxation be deformed, anti-bottom excavation of foundation pit
The phenomenons such as the sillar during Chang Longsheng, slide creep loosens, these phenomenons all with the accumulation of rock interior stress
Relevant with release, therefore the generation of rock internal stress and the research of release rule must obtain enough attention.
It is study of rocks internal stress engineering properties by the accumulation of laboratory test study of rocks internal stress and release rule
Important method and approach.Due to the uncertainty of internal stress in natural rock, the survey to test specimen in addition
Examination is destructive, and sample once destroys and can not carry out repeating test；Natural internal stress rock sampling cost is high,
Uncertain big, it is impossible to obtain suitable sample, it is therefore desirable to artificial preparation internal stress sample carries out test and grinds
Study carefully, but the correlation test currently for rock internal stress is studied less, the especially phase of simulation rock internal stress
Close technology and equipment not yet to find.
The Chinese invention patent of Application No. 201210101103.8, discloses a kind of artificial long core and system thereof
Preparation Method.The method is the problem being difficult to meet requirement of experiment in order to solve existing artificial core length dimension,
The storage of rock core stress is not made an explanation by the external force in rock core preparation process；Application No.
The Chinese invention patent of 201410260860.9, discloses the preparation method of a kind of joint property shale artificial core.
The method is the problem not possessing joint property in order to solve existing artificial cores, is not set out rock core preparation process
Correlation technique that middle stress is sealed up for safekeeping and explanation.The Chinese invention patent of Application No. 201510329020.8, open
A kind of rock mass mechanics experiment sampling die.The method is not have system to solve existing rock core sampling die
The problem making the rock core in different size, different structure face, does not store the stress in sample making course and says
Bright.
Therefore, the structure design of this mould can make compressive stress be stored in inside sample, obtains storing different stress
Sample, meet the demand of experimental study.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention provide a kind of can the Artificial Core Making of pressure store
Method, the method can obtain storing the artificial core with certain compressive stress, it is possible to relatively accurate simulation
Go out to have natural internal stress rock core mechanical characteristic.
The preparation method of a kind of compressive pre-stress artificial core, comprises the steps:
(1) epoxy resin component A and firming agent B component are carried out mix and blend；
(2) after the mixture in step (1) adding quartz sand, uniform stirring；
(3) demixing in step (2) is cast in internal stress cylindrical die, mould with mix
It is coated with one layer of mould release between thing, by bolt bar, the mixture in (2) is applied pressure, treat that cylinder sample is solid
After chemical conversion type, i.e. can get internal stress rock core.
In any of the above-described scheme preferably, the mass ratio of described epoxy resin component A and firming agent B component is
3∶1。
In any of the above-described scheme preferably, the mixture of described epoxy resin component A and firming agent B component and
The mass ratio of quartz sand is 1: 1.
In any of the above-described scheme preferably, the granularity of described quartz sand is 18～80 mesh.
In any of the above-described scheme preferably, the model of described epoxy resin is HZ8803.
In any of the above-described scheme preferably, in step (1), described mixed method is, first solidification
Agent B component adds in blender, is then stirred in machine adding epoxy resin component A.
In any of the above-described scheme preferably, in step (1), described stirring is to use quartz sand blender
Stir 3～5 minutes.
In any of the above-described scheme preferably, in step (2), described stirring is to use quartz sand blender
Stir 5～10 minutes.
In any of the above-described scheme preferably, in step (3), described mould release is vaseline, should be from
Type agent can reduce the cohesive force between rock core and mould.
In any of the above-described scheme preferably, in step (3), described in execute stressed size and be
2000～20000N.
In any of the above-described scheme preferably, in step (3), described cylinder sample is a size of
50mm×100mm.This kind of sample can meet the specimen size requirement of existing testing machine pressure system.
In any of the above-described scheme preferably, in step (3), under the conditions of described curing molding is 20 DEG C
Solidify 72 hours.
Beneficial effect
In the present invention, the compressive pre-stress rock core of preparation is suitable for simulating the natural rock containing internal stress；Sample preparation
Journey take into account quartz Grains number, apply the pressure impact on the mechanical property of rock core so that the rock of preparation
Heart sample is similar to the natural mechanical properties of rock containing internal stress, and specimen size is suitable to current existing pressure
Pilot system, further understanding have the mechanical property of the rock of internal stress, in order to have rock internal stress
Deeper understanding；Material used by the method is simple, with low cost, easy and simple to handle.
Accompanying drawing explanation
Fig. 1 is the vertical section organigram of preferred embodiment.
Fig. 2 is the compressive pre-stress artificial core picture of preferred embodiment.
Fig. 3 is the relation of sample porosity and sample preparation pressure.
Fig. 4 is the relation of sample longitudinal wave velocity and sample preparation pressure.
Fig. 5 is the relation of sample comprcssive strength and sample preparation pressure.
Fig. 6 is axial strain and the relation of sample preparation pressure after sample heating.
1-stainless steel casing in figure, 2-bearing plate, 3-rotating handles, 4-pressure transducer.
Detailed description of the invention
Embodiment 1
The preparation method of a kind of compressive pre-stress artificial core, comprises the steps:
(1) epoxy resin component A and firming agent B component are carried out mix and blend；
(2) after the mixture in step (1) adding quartz sand, uniform stirring；
(3) demixing in step (2) is cast in internal stress cylindrical die, mould with mix
It is coated with one layer of mould release between thing, by bolt bar, the mixture in (2) is applied pressure, treat that cylinder sample is solid
After chemical conversion type, i.e. can get internal stress rock core.
In the present embodiment, the mass ratio of described epoxy resin component A and firming agent B component is 3: 1.
In the present embodiment, described epoxy resin component A and the mixture of firming agent B component and the matter of quartz sand
Amount ratio is 1: 1.
In the present embodiment, the granularity of described quartz sand is 18 mesh.
In the present embodiment, the model of described epoxy resin is HZ8803.
In the present embodiment, in step (1), described mixed method is, first firming agent B component is added
Enter in blender, be then stirred in machine adding epoxy resin component A.
In the present embodiment, in step (1), described stirring is to stir 5 minutes with quartz sand blender.
In the present embodiment, in step (2), described stirring is to stir 10 points with quartz sand blender
Clock.
In the present embodiment, in step (3), described mould release is vaseline.
In the present embodiment, in step (3), described in execute stressed size be 2000N.
In the present embodiment, in step (3), described cylinder sample a size of 50mm × 100mm.
In the present embodiment, in step (3), described curing molding solidifies 72 under the conditions of being 20 DEG C
Hour.
Embodiment 2
The preparation method of a kind of compressive pre-stress artificial core, comprises the steps:
(1) epoxy resin component A and firming agent B component are carried out mix and blend；
(2) after the mixture in step (1) adding quartz sand, uniform stirring；
(3) demixing in step (2) is cast in internal stress cylindrical die, mould with mix
It is coated with one layer of mould release between thing, by bolt bar, the mixture in (2) is applied pressure, treat that cylinder sample is solid
After chemical conversion type, i.e. can get internal stress rock core.
In the present embodiment, the mass ratio of described epoxy resin component A and firming agent B component is 3: 1.
In the present embodiment, described epoxy resin component A and the mixture of firming agent B component and the matter of quartz sand
Amount ratio is 1: 1.
In the present embodiment, the granularity of described quartz sand is 80 mesh.
In the present embodiment, the model of described epoxy resin is HZ8803.
In the present embodiment, in step (1), described mixed method is, first firming agent B component is added
Enter in blender, be then stirred in machine adding epoxy resin component A.
In the present embodiment, in step (1), described stirring is to stir 3 minutes with quartz sand blender.
In the present embodiment, in step (2), described stirring is to stir 5 points with quartz sand blender
Clock.
In the present embodiment, in step (3), described mould release is vaseline.
In the present embodiment, in step (3), described in execute stressed size be 20000N.
In the present embodiment, in step (3), described cylinder sample a size of 50mm × 100mm.
In the present embodiment, in step (3), described curing molding solidifies 72 under the conditions of being 20 DEG C
Hour.
Performance test
1, the basic mechanical properties test of epoxy resin internal stress sample
As a example by example, the sample of sample preparation pressure respectively 0N, 2000N and 20000N is carried out porosity,
Longitudinal wave velocity and uniaxial compressive strength test, result is as shown in Figure 3-Figure 5；Sample is placed respectively not equality of temperature
The baking oven of degree toasts 2 hours, takes out sample, be cooled to room temperature (25 DEG C) afterwards test sample until sample
Axial deformation, result is as shown in Figure 6.
Result of the test shows (being shown in Table 1-2): the sample of different sample preparation pressure, porosity, longitudinal wave velocity and
All there is difference in comprcssive strength, specifically, along with sample preparation pressure becomes big, the porosity of sample diminishes, vertical
Wave-wave speed increases, and comprcssive strength increases.The axial displacement of sample is detected in heating process, it is found that along with
Temperature raises, and sample axial dimension becomes big, but after being cooled to room temperature, 2000N (example 1) and 20000N
The sample of (example 2) sample preparation pressure can not be fully returned to original size, and 20000N sample preparation pressure
Sample (example 2) expendable strain, more than the sample (example 1) of 2000N sample preparation pressure, illustrates examination
Sample stores the most releasable strain in sample making course, i.e. stores internal stress, and meanwhile, sample preparation pressure is more
Greatly, the internal stress of storage is the biggest.
The basic physico-mechanical properties of the sample of the different sample preparation pressure of table 1
| Sample preparation pressure | Porosity/% | Longitudinal wave velocity/m/s | Comprcssive strength/MPa |
| 0N | 23.57 | 2481.67 | 61.93 |
| 2000N | 20.42 | 2615.00 | 70.10 |
| 20000N | 3.05 | 3201.67 | 77.30 |
Table 2 heat treatment detection epoxy resin internal stress data
Last it is noted that obvious, above-described embodiment is only by clearly demonstrating the act that the application is made
Example, and not restriction to embodiment.For those of ordinary skill in the field, state upper
Can also make other changes in different forms on the basis of bright.Here without also cannot be to all of
Embodiment gives exhaustive.And the obvious change thus amplified out or variation are still in the application type
Protection domain among.
Claims (10)
1. the preparation method of a compressive pre-stress artificial core, it is characterised in that comprise the steps:
(1) epoxy resin component A and firming agent B component are carried out mix and blend；
(2) after the mixture in step (1) adding quartz sand, uniform stirring；
(3) being cast in internal stress cylindrical die by the demixing in step (2), mould is with mixed
It is coated with one layer of mould release between compound, by bolt bar, the mixture in (2) is applied pressure, treat cylinder sample
After curing molding, i.e. can get internal stress rock core.
2. the preparation method of compressive pre-stress artificial core as claimed in claim 1, it is characterised in that described
The mass ratio of epoxy resin component A and firming agent B component is 3: 1.
3. the preparation method of compressive pre-stress artificial core as claimed in claim 1, it is characterised in that described
The mass ratio of epoxy resin component A and the mixture of firming agent B component and quartz sand is 1: 1.
4. the preparation method of compressive pre-stress artificial core as claimed in claim 1, it is characterised in that described
The granularity of quartz sand is 18～80 mesh.
5. the preparation method of compressive pre-stress artificial core as claimed in claim 1, it is characterised in that described
The model of epoxy resin is HZ8803.
6. the preparation method of compressive pre-stress artificial core as claimed in claim 1, it is characterised in that described
Mixed method be first firming agent B component to be added in blender, be then stirred in machine interpolation epoxy resin
Component A.
7. the preparation method of compressive pre-stress artificial core as claimed in claim 1, it is characterised in that step
(1) stirring described in is to stir 3～5 minutes with quartz sand blender.
8. the preparation method of compressive pre-stress artificial core as claimed in claim 1, it is characterised in that step
(2) stirring described in is to stir 5～10 minutes with quartz sand blender.
9. the preparation method of compressive pre-stress artificial core as claimed in claim 1, it is characterised in that described
Mould release be vaseline, vaseline coating layer thickness is 1～2mm.
10. the preparation method of compressive pre-stress artificial core as claimed in claim 1, it is characterised in that institute
Stating and executing stressed size is 2000～20000N；Described cylinder sample a size of 50mm × 100mm；
Curing molding described in step (3) solidifies 72 hours under the conditions of being 20 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610270673.8A CN105973661A (en) | 2016-04-27 | 2016-04-27 | Preparation method of compressive pre-stress artificial rock core |
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| CN201610270673.8A CN105973661A (en) | 2016-04-27 | 2016-04-27 | Preparation method of compressive pre-stress artificial rock core |
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Cited By (5)
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| CN108918214A (en) * | 2018-05-17 | 2018-11-30 | 中国石油天然气股份有限公司 | A kind of conglomerate sample preparation methods for core analysis and the conglomerate sample for core analysis |
| CN113984486A (en) * | 2021-10-20 | 2022-01-28 | 中海石油(中国)有限公司 | Preparation method of loose sandstone fractured rock sample with preset open hole |
| CN114199647A (en) * | 2021-12-13 | 2022-03-18 | 四川大学 | Rock mass in-situ stress curing method and curing system |
| CN114486417A (en) * | 2021-12-25 | 2022-05-13 | 中国石油天然气股份有限公司 | High-fidelity heterogeneous conglomerate artificial core and manufacturing method thereof |
| CN114791483A (en) * | 2022-04-01 | 2022-07-26 | 四川大学 | Rock mechanical behavior testing and analyzing method based on simulated deep in-situ sample |
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| CN104198680A (en) * | 2014-09-18 | 2014-12-10 | 陕西科技大学 | Artificial core for simulating rock erosion process and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113984486A (en) * | 2021-10-20 | 2022-01-28 | 中海石油(中国)有限公司 | Preparation method of loose sandstone fractured rock sample with preset open hole |
| CN114199647A (en) * | 2021-12-13 | 2022-03-18 | 四川大学 | Rock mass in-situ stress curing method and curing system |
| CN114486417A (en) * | 2021-12-25 | 2022-05-13 | 中国石油天然气股份有限公司 | High-fidelity heterogeneous conglomerate artificial core and manufacturing method thereof |
| CN114791483A (en) * | 2022-04-01 | 2022-07-26 | 四川大学 | Rock mechanical behavior testing and analyzing method based on simulated deep in-situ sample |
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