CN106908293B - Preparation method of transparent rock joint replica - Google Patents
Preparation method of transparent rock joint replica Download PDFInfo
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- CN106908293B CN106908293B CN201710114653.6A CN201710114653A CN106908293B CN 106908293 B CN106908293 B CN 106908293B CN 201710114653 A CN201710114653 A CN 201710114653A CN 106908293 B CN106908293 B CN 106908293B
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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
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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
- G01N2001/366—Moulds; Demoulding
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Abstract
the invention discloses a preparation method of a transparent rock joint replica, which comprises the steps of firstly, manually manufacturing a complete splitting tensile joint of a rock sample to be researched to obtain a rock joint surface A and a rock joint surface B which are paired; then making a square mould frame with the size larger than the rock joint surface, placing the rock joint surface in the middle of the square mould frame, then injecting viscous silicon rubber liquid added with a curing agent, placing the square mould frame in a vacuum box for defoaming, taking out the square mould frame for curing and demoulding to obtain silicon rubber moulds of two rock joint surfaces, mixing crystal hard rubber A and crystal hard rubber B to obtain a crystal hard rubber mixed liquid, injecting the crystal hard rubber mixed liquid into the prepared silicon rubber mould, placing the poured silicon rubber mould in the vacuum box for defoaming, standing and curing in a ventilation place, and then opening the mould to obtain transparent replicas of the two rock joint surfaces; and splicing the two transparent replicas up and down to obtain the transparent rock joint replica. The method has the advantages of simple operation, low cost and high transparency of the replica, and is suitable for field operation.
Description
Technical Field
the invention belongs to the technical field of rock seepage and solute migration visualization, and relates to a method for manufacturing a rock joint replica, in particular to a method for manufacturing a transparent rock joint replica.
Background
In recent years, with the increasing attention of China to the problem of environmental pollution, such as underground water pollutant migration, safety of nuclear waste disposal libraries, planned development of new energy sources such as shale gas and the like, the theory and experimental technology related to the migration mechanism of the solute in rock joint become a new research direction.
experiments related to the migration of solute in rock joints are mainly divided into field large-scale migration experiments and indoor small-scale single-joint experiments.
the domestic solute migration experiment is mainly focused on the superficial earth surface, and the migration medium is mainly soil. The research problems include the measurement of the migration of pollutants with groundwater, the loss of organic elements in soil and the like. The application of the technology or research in the engineering field is less and is mainly limited by the technology and the experimental field. The field test is large in investment and difficult to operate, numerical values obtained by the migration test are large in fluctuation and strong in pertinence but poor in representativeness, and meanwhile, the test has high requirements on a measuring instrument, a tracer and a measuring area. Therefore, the scholars at home and abroad also carry out a large amount of indoor single-joint solute migration tests while carrying out field tests. While the results obtained from single-joint solute transport tests are often only used as references for in situ formation properties, laboratory tests have their irreplaceable role in revealing the microscopic processes and mechanisms of solute transport in the joint. Due to the sealing property of the joint, the gap width and the direct measurement of the concentration change of the solute along with the migration of the water flow become key technical problems for researching the joint solute migration process. Many scholars at home and abroad carry out rock joint solute migration experiments, and often only can control the boundary conditions of a joint inlet and a joint outlet, and measurable experimental data can be obtained at the outlet. With the continuous and deep research on the migration mechanism of the water flow and the solute of the rock joint, researchers gradually pay attention to the relationship between the water flow and dispersion parameters and the roughness and the gap width of the joint surface, the concentration change of the water flow at the outlet of the rock joint cannot meet the research requirement after independently researching the water flow concentration change, and the transparent material provides a thought and a method for deepening the research. Meanwhile, the rock joint surface has obvious self-affine characteristics and randomness, and the characteristics truly reflecting the joint surface are the main direction of the current research.
At present, a preparation method of a high-imitation rock joint material which can restore the roughness of the surface of a real rock joint and has the transparent characteristic is not available in China. The existing methods mainly comprise two methods: firstly, joint replication is carried out by using materials without transparent property, such as cement and the like, and the method has low reduction degree on rough joints and does not have the transparent property; and secondly, a joint structure is simulated by using a transparent resin and gasket method, and although the manufactured joint is transparent and observable, the rough characteristic of the joint is not reflected. Therefore, aiming at the defects of the two methods, a preparation method of the high-imitation rock joint material with the characteristics of transparency and joint roughness is needed by researchers at present.
Disclosure of Invention
The invention mainly solves the problems that the rock joint characteristics cannot be truly reflected and the over-current observation is convenient in the prior art, provides a joint test piece copying method with the characteristics of transparency and high simulated joint roughness, and provides a specific preparation process of the test piece. The invention mainly comprises the following contents:
First, the existing research results show that the Brazilian splitting method is a basic method for manufacturing rough rock joints in indoor tests, and the method can manufacture good real-like rough rock joint surfaces. Therefore, aiming at the problem of really reducing the rough joint surface of the rock, the invention adopts silicon rubber with good fluidity as a casting mould to completely cover the joint surface test piece manufactured by the Brazilian splitting method and reconstruct the surface appearance characteristic of the rock joint.
Secondly, aiming at the problem of visualization observation of the interior of the joint and considering the requirement of real reduction of the joint surface, the crystal hard glue is adopted as a rock simulation material, the crystal hard glue A and the crystal hard glue B with good fluidity are fully mixed and poured into a silicon rubber mold, and the joint surface test piece meeting the requirement can be obtained after solidification and demolding.
In order to solve the technical problems, the invention adopts the technical scheme that:
A method of preparing a transparent rock joint replica, comprising the steps of:
Selecting a rock sample of a joint to be researched, and manufacturing a complete splitting tensile joint of the rock sample to obtain a rock joint surface A and a rock joint surface B corresponding to the rock joint surface A;
Step two, respectively manufacturing a rock joint surface A silicon rubber mold and a rock joint surface B silicon rubber mold;
a. Manufacturing a detachable square mould frame which is larger than the rock joint surface A in size, placing the square mould frame on a flat plate, placing the rock joint surface A in the middle of the square mould frame, and coating a layer of release agent on the surface of the rock joint surface A, the inner side of the mould frame and the exposed part of the flat plate;
b. Adding a curing agent into the viscous silicone rubber liquid, stirring uniformly, then placing into a vacuum box for defoaming, taking out to prepare a silicone rubber pouring solution, injecting the silicone rubber pouring solution into the square mold frame to submerge the joint surface of the rock joint surface A, placing the square mold frame in a dry and ventilated place for standing and curing after the silicone rubber pouring solution automatically flows and levels, and removing the mold after curing to obtain a rock joint surface A silicone rubber mold;
c. The silicon rubber mold of the rock joint surface B is manufactured by the same method;
Step three, manufacturing transparent rock joint replicas, namely mixing crystal hard glue A and crystal hard glue B to prepare a crystal hard glue mixed solution, standing the crystal hard glue mixed solution for a period of time, pouring the crystal hard glue mixed solution into the silicon rubber mold prepared in the step two, placing the poured silicon rubber mold into a vacuum box for defoaming, standing and curing the silicon rubber mold in a dry and ventilated place, and opening the mold after curing, so that the transparent rock joint surface A replicas and the transparent rock joint surface B replicas are respectively manufactured by the method;
And step four, combining the upper cover and the lower cover of the transparent replica of the rock joint surface A and the transparent replica of the rock joint surface B, and clamping the transparent replicas and the rock joint surface B up and down by using a glass plate to obtain the transparent rough rock joint replica of the rock sample.
Preferably, in the first step, a brazilian splitting method is adopted to manufacture a complete splitting tensile joint of the rock sample, and the specific steps are as follows:
a. Cutting a rock sample into standard cubic rock with a required size, loading the standard cubic rock into a pressurizing device with a steel wedge, and applying a normal load to the standard cubic rock by using the pressurizing device until a complete splitting joint is generated;
b. and (3) opening the standard cubic rock to be split, and removing small particles attached to the rough surface of the splitting tensile joint generated in the splitting process by using a brush to obtain a rock joint surface A and a rock joint surface B.
Preferably, in the second step, the square mold frame is made of organic glass through adhesive bonding, and the release agent is vaseline.
Preferably, in the second step, the curing agent is added into the viscous silicone rubber liquid in a proportion of 1-5%.
Preferably, in the third step, when the transparent rough rock joint replica is manufactured, the crystal hard glue mixed solution is poured in a plurality of times, and the thickness of each pouring is 1.5cm-2.5 cm.
Preferably, in the third step, before the silicon rubber mold is cured, a vacuum box is defoamed by a graded defoaming method, namely, the vacuum box is vacuumized for 3-7 minutes, then air is discharged, and then the vacuum box is vacuumized for 8-15 minutes, so that a defoaming process is completed.
Preferably, in the third step, the crystal hard glue comprises crystal hard glue A and crystal hard glue B, and the crystal hard glue A and the crystal hard glue B are mixed according to the mass ratio of 2.5:1-3.5: 1.
Preferably, in the second form removing process, the square form frame is removed first, and then the flat plate is removed.
The invention has the beneficial effects that:
The test piece prepared by the method has the advantages of high transparency and high simulation of the topographic features of the joint surface of the solid rock, is convenient for observing the transmission state of the colored fluid in the joint, is simple to operate and low in cost, can be combined with a plurality of optical observation instruments, and provides a basic research method for the interdisciplinary fields of rock mechanics, hydromechanics and hydrochemistry. Meanwhile, the method can also be used for field operation, and the problem of difficult field sampling is solved.
Drawings
FIG. 1 is a schematic diagram of a method for manually splitting a rock sample.
Fig. 2 is a schematic diagram of a rock joint surface silica gel mold casting process.
FIG. 3 is a schematic diagram of a process for manufacturing a silica gel mold for a rock joint surface.
FIG. 4 is a schematic diagram of a method of making a transparent rock joint replica using a rock joint face silicone mold.
FIG. 5 is an example of a replication process embodiment in which (a) a sample and mold frame are placed; (b) drawing of a silica gel reverse mold finished product; (c) a single-process replica map; (d) a transparent joint mosaic; (e) original joint and a copied finished product picture.
1-standard cubic rock, 2-pressurizing device, 3-steel wedge, 4-splitting joint, 5-rock joint face A, 6-rock joint face B, 7-viscous silicone rubber liquid, 8-curing agent, 9-silicone rubber pouring solution, 10-square mold frame, 11-crystal hard rubber A, 12-crystal hard rubber B, 13-crystal hard rubber mixed liquid, 14-rock joint face A silicone rubber mold, 15-rock joint face B silicone rubber mold, 16-rock joint face A transparent replica, 17-rock joint face B transparent replica and 18-transparent rock joint replica.
Detailed Description
In order to clearly and clearly explain the objects, technical solutions and gist of the present invention, the present invention is further described below with reference to the accompanying drawings and examples.
Examples
First, the basic method for manufacturing the sample is described: firstly, preparing a rock sample, as shown in fig. 1, manufacturing an artificial splitting joint, selecting a rock sample to be researched, cutting the rock sample into a standard cubic rock 1, loading the standard cubic rock 1 into a pressurizing device 2 connected with a steel wedge 3, and applying a normal load by the pressurizing device 2 until the standard cubic rock 1 generates a complete splitting joint 4. And opening the split rock sample to obtain a rock joint surface A5 and a corresponding rock joint surface B6. The rock sample is selected from granite or sandstone.
Next, a silicone rubber mold is prepared, and as shown in fig. 2 and 3, a curing agent 8 is added to the viscous silicone rubber liquid 7, and the mixture is sufficiently mixed to obtain a silicone rubber casting solution 9 containing the curing agent. The rock joint surface A5 and the rock joint surface B6 are respectively placed in two square mold frames 10 made of organic glass, and silicone rubber pouring solution 9 containing curing agent is respectively added until the joint surfaces are submerged. And then standing for 24 hours for curing, wherein the curing time can be judged and adjusted according to actual conditions, and after curing, removing the mold to respectively manufacture the rock joint surface A silicon rubber mold 14 and the rock joint surface B silicon rubber mold 15. Finally, a transparent joint replica is produced, and as shown in fig. 4, the crystal hard glue a11 and the crystal hard glue B12 are mixed to obtain a crystal hard glue mixture 13. And respectively pouring the mixed crystal hard rubber mixed solution 13 into a rock joint surface A silicon rubber mould 14 and a rock joint surface B silicon rubber mould 15, solidifying, hardening, demoulding and taking out to obtain a rock joint surface A transparent replica 16 and a rock joint surface B transparent replica 17. And splicing the joint surfaces of the two transparent replicas up and down to obtain the transparent rock joint replica 18.
The embodiment of the invention is as follows (the replication process and an example of a replica is shown in FIG. 5)
Step 1: and manufacturing an artificial splitting sheet joint.
a rock sample is cut into standard cubic rock 1 of the desired size and loaded into a press 2 with a steel wedge 3. The Brazilian splitting method is adopted to press the normal direction of the standard cubic rock 1 through the pressurizing device 2 to manually split to obtain a splitting tension joint 4 consisting of an upper rough surface and a lower rough surface. And (3) removing small particles attached to the joint rough surface generated in the splitting process by using a brush to obtain a rock joint surface A5 and a rock joint surface B6 corresponding to the rock joint surface A5.
step 2: and (3) manufacturing a silicon rubber mold of the two rock joint surfaces.
A square mold frame 10 made of organic glass is prepared, the length and the width of the inner part of the square mold frame 10 are respectively about 2cm longer and about 2cm wider than the rock joint surface A5, and the height of the square mold frame 10 is about 2 times of the rock joint surface A5. The four pieces of organic glass which surround the square mould frame 10 are bonded by glue, so that the disassembly is convenient; the square mold frame 10 is placed on a flat plate slightly larger than the extension of the square mold frame 10, and the flat plate is made of wood. The rock joint plane A5 is placed in the center of the square mold frame 10, as shown in FIG. 5(a), and solid vaseline is used as a release agent and uniformly coated on the surface of the rock joint plane A5, the inner side of the square mold frame 10 and the surface of the exposed part of the flat plate.
After the volume is calculated, taking the corresponding viscous silicone rubber liquid 7, adding about 2% of curing agent 8, fully stirring by using a scraper knife, then placing the viscous silicone rubber liquid into a vacuum box for defoaming for five minutes, taking the viscous silicone rubber liquid out, and slowly pouring the viscous silicone rubber liquid into a square mold frame 10 so as to submerge the joint surface of the rock joint surface A5 to be about 2 cm. After the self-flow is leveled, the mixture is placed in a dry and ventilated place for standing. Standing and curing for about 24 hours, and removing the mold, firstly removing the square mold frame 10 made of organic glass, then removing the bottom flat plate, and finally carefully demolding to obtain the rock joint surface A silicone rubber mold 14. The silicone rubber mold 15 for rock joint face B can be produced in the same manner as described above, as shown in fig. 5 (B).
Step 3, preparing transparent rock joint replicas, preparing crystal hard glue A12 and crystal hard glue B13 according to a weight ratio of about 3: 1, wherein the total weight refers to the volume of replicas to be prepared, the total amount of prepared liquid is not too much, otherwise, solidification is influenced, so that the thickness of 1.5 ~ 2cm is prepared at one time, after the two liquids are fully mixed, standing for five minutes, respectively pouring the liquids into a rock joint face A silicon rubber mold 14 and a rock joint face B silicon rubber mold 15, putting the poured silicon rubber mold into a vacuum box for defoaming, vacuumizing for five minutes, then vacuumizing for ten minutes, taking out and covering to avoid dust from entering and influencing transparency, after standing for 24 hours in a dry ventilation mode for ~ 36 hours, carefully opening the molds to obtain the transparent replicas 16 and 17 of the rock joint face A and the rock joint face B, as shown in (c) and (d) of fig. 5.
And 4, step 4: the transparent replica 16 of the rock joint face a and the transparent replica 17 of the rock joint face B are taken out and then joined together, and are clamped up and down using glass plates, so that a rock joint replica 18 is obtained, as shown in fig. 5 (e).
the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (8)
1. a method of preparing a transparent rock joint replica, comprising the steps of:
selecting a rock sample of a joint to be researched, and manufacturing a complete splitting tensile joint of the rock sample to obtain a rock joint surface A and a rock joint surface B corresponding to the rock joint surface A;
Step two, respectively manufacturing a rock joint surface A silicon rubber mold and a rock joint surface B silicon rubber mold;
a. Manufacturing a detachable square mould frame which is larger than the rock joint surface A in size, placing the square mould frame on a flat plate, placing the rock joint surface A in the middle of the square mould frame, and coating a layer of release agent on the surface of the rock joint surface A, the inner side of the mould frame and the exposed part of the flat plate;
b. adding a curing agent into the viscous silicone rubber liquid, stirring uniformly, then placing into a vacuum box for defoaming, taking out to prepare a silicone rubber pouring solution, injecting the silicone rubber pouring solution into the square mold frame to submerge the joint surface of the rock joint surface A, placing the square mold frame in a dry and ventilated place for standing and curing after the silicone rubber pouring solution automatically flows and levels, and removing the mold after curing to obtain a rock joint surface A silicone rubber mold;
c. the silicon rubber mold of the rock joint surface B is manufactured by the same method;
step three, manufacturing transparent rock joint replicas, namely mixing crystal hard glue A and crystal hard glue B to prepare a crystal hard glue mixed solution, standing the crystal hard glue mixed solution for a period of time, pouring the crystal hard glue mixed solution into the silicon rubber mold prepared in the step two, placing the poured silicon rubber mold into a vacuum box for defoaming, standing and curing the silicon rubber mold in a dry and ventilated place, and opening the mold after curing, so that the transparent rock joint surface A replicas and the transparent rock joint surface B replicas are respectively manufactured by the method;
And step four, combining the upper cover and the lower cover of the transparent replica of the rock joint surface A and the transparent replica of the rock joint surface B, and clamping the transparent replicas and the rock joint surface B up and down by using a glass plate to obtain the transparent rough rock joint replica of the rock sample.
2. A transparent rock joint replica preparation method according to claim 1, characterized in that: in the first step, a Brazilian splitting method is adopted to manufacture a complete splitting tensile joint of the rock sample, and the specific steps are as follows:
a. cutting a rock sample into standard cubic rock with a required size, loading the standard cubic rock into a pressurizing device with a steel wedge, and applying a normal load to the standard cubic rock by using the pressurizing device until a complete splitting joint is generated;
b. And (3) opening the standard cubic rock to be split, and removing small particles attached to the rough surface of the splitting tensile joint generated in the splitting process by using a brush to obtain a rock joint surface A and a rock joint surface B.
3. A transparent rock joint replica preparation method according to claim 1, characterized in that: in the second step, the square mould frame is made of organic glass through gluing, and the release agent is vaseline.
4. A transparent rock joint replica preparation method according to claim 1, characterized in that: in the second step, the curing agent is added into the viscous silicon rubber liquid in a proportion of 1-5%.
5. a transparent rock joint replica preparation method according to claim 1, characterized in that: in the third step, when the rough joint replica of the transparent rock is manufactured, the mixed liquid of the crystal hard glue is poured for several times, and the thickness of each pouring is 1.5cm-2.5 cm.
6. a transparent rock joint replica preparation method according to claim 1, characterized in that: in the third step, before the silicon rubber mold is cured, a vacuum box is defoamed by a graded defoaming method, namely, the vacuum box is vacuumized for 3-7 minutes, then air is released, and then the vacuum box is vacuumized for 8-15 minutes, so that a defoaming process is completed.
7. A transparent rock joint replica preparation method according to claim 1, characterized in that: in the third step, the crystal hard glue comprises crystal hard glue A and crystal hard glue B, and the crystal hard glue A and the crystal hard glue B are mixed according to the mass ratio of 2.5:1-3.5: 1.
8. A transparent rock joint replica preparation method according to claim 1, characterized in that: and in the second step of removing the mould, the square mould frame is removed firstly, and then the flat plate is removed.
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| CN107576547B (en) * | 2017-10-24 | 2019-12-13 | 大连理工大学 | Preparation method of rock sample containing tiny and closed cracks |
| CN109827823B (en) * | 2019-03-18 | 2023-10-31 | 四川农业大学 | Test device capable of adopting fluid to stage cementing rock joint surface and use method |
| CN111504873A (en) * | 2020-04-24 | 2020-08-07 | 武汉大学 | Method for manufacturing rock cross fracture simulation model |
| CN112098175B (en) * | 2020-09-28 | 2022-12-16 | 银邦金属复合材料股份有限公司 | Preparation method of metal corrosion test sample |
| CN114347320A (en) * | 2022-01-06 | 2022-04-15 | 中国建筑科学研究院有限公司 | Preparation method of silicone rubber mold for resin casting body colloid performance test |
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| US20140127500A1 (en) * | 2012-11-06 | 2014-05-08 | Schott Corporation | Delamination-and abrasion-resistant glass window |
| CN103926129B (en) * | 2014-05-04 | 2016-04-13 | 中南大学 | One copies joint waviness and experimental technique with artificial rock material |
| CN104865110B (en) * | 2015-06-01 | 2017-05-10 | 中国矿业大学 | Method for prefabricating rough fractures in rocklike similar material specimen |
| CN105252957A (en) * | 2015-09-07 | 2016-01-20 | 王韬华 | Natural rock duplication technology |
| KR101706541B1 (en) * | 2015-09-14 | 2017-02-15 | 이재경 | Portable device of image aquisition for rock drilled core |
| CN106248454B (en) * | 2016-08-08 | 2019-07-09 | 绍兴文理学院 | A kind of production method of transparent petrophysical model structural plane test specimen |
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