CN115824743A - Manufacturing method and simulation test method of high-transparency rock-like resin test piece - Google Patents

Abstract

The application discloses a manufacturing method and a testing method of a high-transparency rock-like resin test piece, and provides a comprehensive solution for the technical problems of poor transparency of the existing rock-like resin test piece and surface liquefaction and fogging in the testing process: (1) adding a transparent nucleating agent and an internal fogging agent into a test piece raw material; (2) the whole casting molding process of the test piece is in a vacuum environment; (3) placing the mixture into warm water for preheating before vacuumizing to reduce the viscosity, so as to be beneficial to the separation of bubbles; (4) spraying a dry release agent on the inner surface of the forming die to ensure the surface smoothness of the demoulded test piece; (5) before the test, the outer fog agent is sprayed on the surface of the test piece and the inner fog agent added in the casting material jointly play a role in preventing the water fog on the surface of the test piece from gathering. The high-transparency rock-like resin test piece prepared by the method greatly improves the purity of the resin material, ensures the transparency of the resin material to be maintained within a period of time, and has important significance for researching crack expansion and damage deformation of the rock.

Description

Manufacturing method and simulation test method of high-transparency rock-like resin test piece

Technical Field

The application relates to the technical field of rock mechanical tests, in particular to a manufacturing method and a testing method of a high-transparency rock-like resin test piece.

Background

The rock-like resin material is adopted to manufacture the test piece to carry out simulation research, and the method is more and more applied to the field of indoor tests of rock mechanics, and provides a new means method for researching the internal deformation failure rule and the fracture mechanism of the rock under different loading conditions. The resin test piece can be completely transparent, compared with opaque rock materials such as cement mortar, ceramics, gypsum and the like, the fracture evolution law in the test piece can be directly observed by naked eyes, and cracks and faults can be pre-embedded to carry out indoor simulation test research on the instability mechanism of the engineering rock mass, so that the resin test piece has important academic value and engineering significance.

Transparency is very important to maintain the academic value and advantages of resin test pieces, but the inventor of the application finds in long-term engineering practice that preparing high-transparency resin test pieces meeting the requirements faces many technical difficulties and challenges: firstly, a resin test piece is formed by mixing and curing resin and a curing agent according to a certain proportion; although the resin is transparent, most curing agents are opaque, usually in light yellow or black, so that the transparency of the blended test piece becomes poor, directly affecting the observation of internal cracking (see fig. 1); secondly, the manufacturing process of the resin test piece is complex and time-consuming, and each link in the manufacturing process is likely to be mixed with air to generate internal defects, so that the mechanical property of the manufactured test piece is incomplete; thirdly, the requirement of the resin test piece on demoulding is high, how to ensure that the surface of the test piece after demoulding is smooth and complete and how to ensure that the demoulding agent and the resin are not influenced also plays an important role in the transparency of the test piece; finally, the mechanical properties of the resin test piece are greatly influenced by temperature, and the resin test piece shows rock-like properties only at low temperature, but shows plasticity at normal temperature, so the resin test piece is required to be frozen and placed for a certain time before the test, and then is taken out for testing. For the rock mechanics simulation test process, because the self temperature of the test piece is inconsistent with the ambient temperature, the liquefaction and the fogging can appear on the surface of the test piece, and along with the whole test process, the technical problem that the transparency is influenced by the accumulation of the water fog needs to be solved.

The information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.

Disclosure of Invention

The inventor of the application provides a comprehensive solution to the technical problems of poor transparency of the existing rock-like resin test piece and surface liquefaction and fogging in the test process on the basis of research for many years: (1) adding a transparent nucleating agent and an internal fogging agent into the test piece raw material; (2) the whole casting molding process of the test piece is in a vacuum environment; (3) placing the mixture into warm water for preheating before vacuumizing to reduce the viscosity, so as to be beneficial to the separation of bubbles; (4) spraying a dry release agent on the inner surface of the forming die to ensure the surface smoothness of the demoulded test piece; (5) before the test, the surface of the test piece is sprayed with the external fogging agent, and the external fogging agent and the internal fogging agent added in the casting material jointly play a role in preventing the water mist on the surface of the test piece from gathering.

According to one aspect of the disclosure, a method for manufacturing a high-transparency rock-like resin test piece is provided, which mainly comprises the following steps:

(1) Preparing a castable: epoxy resin and curing agent are mixed in certain proportion to form mixture, transparent nucleating agent sorbitol is added in 0.2-0.9 wt% of the mixture to raise the transparency of the resin mixture, inner fogging agent glycerin monooleate is added in 0.05-0.15 wt% of the mixture to play long-acting antifogging role, and finally the mixture is mixed to form the casting material.

The epoxy resin is a typical crystalline polymer, has high crystallinity and shows certain toughness and rigidity. Research shows that the epoxy resin contains a crystalline region and an amorphous region, the densities of the crystalline region and the amorphous region are different, the densities influence the refractive index of light, when light passes through the epoxy resin, reflection or refraction is formed on an interface due to the difference of the refractive indexes, and the light passing through a polymer is reduced, so that the transparency of the epoxy resin and a curing agent after direct mixing and curing is very poor, and the improvement of the transparency of a test piece by reducing the crystallinity is one of the main points of research; by adding the transparent nucleating agent, the crystallinity is reduced, and the transparency of the resin material can be effectively enhanced.

The state of an amorphous region of a resin material determines whether crystals influence the performance of a polymer, the hardness of the resin is increased along with the increase of the crystallinity, when the crystallinity is continuously increased, the intermolecular interaction force is enhanced, the self-pulling effect of the resin is increased, and the fracture elongation is reduced to a certain degree. In addition, the crystallinity is increased, the intermolecular crosslinking effect is improved, and the stress is reduced and relaxed; therefore, the mechanical property of the resin material can be improved to a certain extent by adding the transparent nucleating agent to a certain extent.

(2) Preheating and degassing: preheating the casting material obtained in the previous step in a constant-temperature water bath at 40-50 ℃ for 10-20 min to reduce viscosity and facilitate discharge of bubbles, and then carrying out vacuumizing treatment for 15-25 min to fully eliminate the bubbles in the casting material.

(3) Casting molding: pouring the degassed castable into a corresponding silica gel mold in a vacuum environment, and maintaining in a constant vacuum environment to solidify and mold the castable; and spraying a layer of dry release agent on the inner surface of the silica gel mold to ensure the surface smoothness of the cast test piece and the generation of bubbles on the surface.

The mold for resin pouring is a cuboid silica gel mold, so that demolding is convenient, the components of the test piece are not influenced, the inner surface of the mold is kept dry and clean, a thin layer of dry demolding agent (SEA 410) is uniformly sprayed on the inner surface before the test, the chemical components of the dry demolding agent are silicone oil and a silicone oil solvent, bubbles on the outer surface of the test piece are effectively prevented, the surface of the test piece is smooth and flat, and demolding is easier; if a coated release agent such as a silicone release agent is used, the surface of the test piece after release becomes opaque due to uneven coating, a large number of fingerprints left by hand, and the like (see fig. 2).

(4) Demolding and maintaining: demoulding the test piece which is solidified and formed in the previous step, and (5) curing for 45-50 h in a drying environment at 65-75 ℃ to obtain the product.

In some embodiments of the present disclosure, the resin is a YD-127 type resin and the curative is a TB-2105 type curative, both at a ratio of 100:38 to obtain a mixture.

In some embodiments of the present disclosure, the transparent nucleating agent is selected from a wide range of sorbitol-based transparent nucleating agents NP-818, which have the aggregation property of self-physical polymerization and can be dissolved in a liquid resin blend to form a homogeneous solution. When the resin mixture is solidified, the transparent agent forms a fibrous network through self-aggregation, and the network is uniformly dispersed and has extremely large surface area. With further solidification, the resin material is firstly combined into lamellar crystals under the action of orientation, and then other parts are arranged along the axial direction of the fiber for crystallization. Therefore, the nucleation density of the resin material is improved, uniform and refined spherulites are formed, the reflection and refraction of light are reduced, the crystallinity is reduced, and the transparency is improved. The NP-818 type clearing agent can also improve the mechanical property of a test piece, improve the surface glossiness and shorten the molding period.

In order to research the influence of the content of the transparent agent on the transparent modification of the resin material, a horizontal test is set, other conditions are controlled to be certain, and different contents of the transparent agent are set: 0.1%,0.2%,0.3%,0.4%,0.5%,0.6%,0.7%,0.8%,0.9%,1%,1.1%,1.2%, and the proportion of the transparent agent which has the best transparent modification effect is obtained by comparing the transparency of the test piece. Test results show that when the proportion of the resin curing agent is determined, when the content of the sorbitol transparent nucleating agent NP-818 is 0.2-0.9%, the transparency of the part higher than 0.9% is higher than 0.2%, and the transparency effect is best when the content is 0.3%; at contents above 0.9%, the opposite effect occurs with an increase in clearing agent.

In some embodiments of the present disclosure, the vacuuming and casting molding are both performed in a vacuuming device, and the vacuuming device comprises a degassing vacuum box provided with a measuring cup therein and a casting vacuum box provided with a silica gel mold therein; a corresponding pouring pipe is arranged between the bottom of the measuring cup and the pouring port of the silica gel mold; the degassing vacuum box and the pouring vacuum box are respectively connected with corresponding vacuum sources through corresponding pipelines, and the degassing vacuum box and the pouring vacuum box have position height difference, so that pouring materials in the measuring cup automatically flow into the silica gel mold through the pouring pipe.

In some embodiments of the present disclosure, valves are respectively disposed at corresponding positions on the outer sides of the vacuum boxes near the two ends of the pouring tube to control the pouring time; the degassing vacuum box and the pouring vacuum box are respectively provided with corresponding pressure relief valves so as to realize the necessary re-pressure in the boxes; and corresponding valves are respectively arranged on pipelines connected between the degassing vacuum box, the pouring vacuum box and the vacuum source so as to control the forming time of the vacuum degree in the degassing vacuum box and the pouring vacuum box.

According to another aspect of the present disclosure, there is provided a simulation test method based on the high transparency rock-like resin test piece, comprising the steps of:

(1) Placing the prepared high-transparency rock-like resin test piece in a freezer at the temperature of-18 to-22 ℃ for at least 20 hours so as to enable the test piece to have the rock-like hardness and brittleness;

(2) And taking out the frozen high-transparency rock resin test piece, repeatedly immersing the test piece into the external fogging agent glycerol monooleate for 1-2 times, taking out the test piece, draining until no liquid flows, and carrying out a rock mechanics simulation test according to a conventional method or a designed method.

The resin test piece is manufactured and maintained under a specific temperature condition, water mist is often generated on the outer surface of the test piece when the temperature changes, and particularly in the process of mechanical test, the pressure of a press machine applies work to the test piece to cause the temperature around the test piece to rise, so that the outer surface of the test piece is fogged, and the observation of the test phenomenon is interfered (see figure 3). The antifogging agent is used for avoiding the outer surface of the test piece from being fogged, so that the high transparency of the test piece in the test process is ensured, and the related mechanical test is smoothly completed.

The antifogging agent has an action mechanism that a special molecular structure of polyol type nonionic surface activity is utilized, an analysis structure of the surface activity has amphipathy, one end of the analysis structure is a hydrophilic group, and the other end of the analysis structure is a hydrophobic group. Hydrophilic group adsorbs the hydrone in the air to reduce its surface tension on the one hand to reduce the contact of hydrone and test piece surface, make the hydrone before the test piece surface forms tiny drop of water, will moisten the test piece surface, form the ultra-thin transparent water film of one deck, on the other hand hydrophobic group then leads to the water film to produce mobility, and the gross effect makes incident light no longer produce the scattering, thereby plays antifog effect, does not disturb the sight.

The antifogging agent in the application is divided into an inner antifogging agent and an outer antifogging agent, wherein the inner fogging agent is usually added into mixed raw materials and plays a long-term antifogging role by continuously diffusing to the outer surface; the external fogging agent acts on the outer surface of the test piece through immersion or spraying, and the effect is quick, but the relative efficiency maintaining time is short. The inner antifogging agent and the outer antifogging agent are used simultaneously in the technical scheme, so that the test piece can be comprehensively guaranteed to keep higher transparency in various mechanical tests performed in a certain period after forming, and relevant mechanical tests are completed.

The inner fogging agent is glycerol monooleate, and has a long-term effect and wide application, the inner fogging agent is added into the resin mixture, uniformly stirred, cured and formed, and can be transferred to the outer surface of the test piece, and after the inner fogging agent on the surface is lost, the inner fogging agent in the test piece can be transferred to the outer surface of the test piece again for supplement until the inner fogging agent is completely used up. The antifogging agent is made of a nano antifogging material, so that the surface tension of the test piece on water is increased, water vapor is difficult to condense on the surface of the test piece, and spherical water drops can be formed and can quickly and automatically flow from the surface of the test piece even if the water vapor condenses on the surface of the test piece. However, due to the short duration of efficacy, the test piece was immersed for half an hour before the start of the test, and the transparency of the surface of the test piece was maintained throughout the test by the combined action of the internal and external fogging agents.

One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

1. the prepared high-transparency rock-like resin test piece greatly improves the purity of the resin material, ensures the transparency of the resin material to be maintained within a period of time, and has important significance for researching crack expansion and damage deformation of the rock.

2. Through improvement of a castable formula, defoaming by a water bath, constant vacuum maintenance, dry demolding and demisting by an internal and external antifogging agent, the technical problems of poor transparency of the existing rock-like resin test piece and surface liquefaction and fogging in the test process are solved.

Drawings

FIG. 1 is a diagram of a raw material of a resin test piece and a finished product of the test piece before a transparent nucleating agent is not added in the existing preparation method; wherein, a is raw material, the left side is epoxy resin, the right side is yellow curing agent, b is a prepared test piece containing a preset crack, and c is a crack propagation diagram in the test piece mechanical test process.

FIG. 2 is a sample of a test piece failed to be manufactured due to a release agent in the development process of the application; wherein, a is a silica gel release agent, a dent is left on the surface of the test piece after the test piece is manually smeared, and b is a resin and the release agent react.

FIG. 3 shows the liquefaction and fogging phenomena of the surface of a test piece without the internal and external fogging agents during the research and development process.

FIG. 4 shows a resin specimen mixed with a large number of bubbles cast under conventional non-vacuum conditions during the development process of the present application.

FIG. 5 is a schematic structural diagram of an evacuation device according to an embodiment of the present application; in the figure, 1 is a degassing vacuum box, 2 is a measuring cup, 3, 5, 11 and 15 are valves, 4 is a pouring tube, 6 is a silica gel mold, 7 is a pouring vacuum box, 8 and 13 are pressure release valves, 9 is a second vacuum pump, 10 and 14 are pipelines, and 12 is a first vacuum pump.

Fig. 6 shows a high-transparency rock-like resin test piece finally manufactured in an embodiment of the present application.

FIG. 7 is a photograph showing the result of propagation and evolution of internal cracks of a high-transparency rock-like resin test piece under a uniaxial compression test according to an embodiment of the present application; wherein a is a front view and a side view of the internal crack at the end of the second loading stage, b is a failure state during the third loading stage, and c is a final splitting failure state of the test piece; in the figure, 1 is a thin line, 2 is a wrapped-type wing crack, 3 is a spot-shaped crack, and 4 is a vertical large crack.

Detailed Description

For better understanding of the technical solutions of the present application, the technical solutions will be described in detail below with reference to the drawings and specific embodiments.

Example one

The example discloses a method for manufacturing a high-transparency rock-like resin test piece, which comprises the following steps:

1. preparing a mixture: YD-127 type epoxy resin and TB-2105 type curing agents are selected as raw materials, and as shown in figure 1 (a), the mass ratio of the YD-127 type epoxy resin to the TB-2105 type curing agent is 100:38, then adding a transparent nucleating agent sorbitol NP-818 with the mass ratio of 0.3 percent, then adding 0.1 percent of inner fogging agent glycerol monooleate, and stirring uniformly to obtain the castable.

2. Preheating and degassing: preheating the casting material obtained in the previous step in a warm water bath at 45 ℃ for 15 minutes, then draining and pouring the casting material into a measuring cup 2 in a degassing vacuum box 1 of a vacuumizing device, and vacuumizing for 20 minutes to completely eliminate bubbles in the mixture.

Referring to fig. 5, the vacuum-pumping device comprises a degassing vacuum box 1 provided with a measuring cup 2 inside and a pouring vacuum box 7 provided with a silica gel mold 6 inside; a corresponding pouring pipe 4 is arranged between the bottom of the measuring cup 2 and a pouring port of the silica gel mold 6; the degassing vacuum box 1 and the pouring vacuum box 7 are respectively connected with a corresponding first vacuum pump 12 and a corresponding second vacuum pump through corresponding pipelines 14 and 10, and position height difference exists between the degassing vacuum box and the pouring vacuum box, so that pouring materials in the measuring cup 2 can automatically flow into the silica gel mold 6 through the pouring pipe 4. Valves 3 and 5 are respectively arranged at corresponding positions on the outer sides of the vacuum boxes at the two ends of the pouring pipe 4 so as to control the pouring time; the degassing vacuum box 1 and the pouring vacuum box 7 are respectively provided with corresponding pressure relief valves 13 and 8 so as to realize necessary re-pressure in the degassing vacuum box and the pouring vacuum box; corresponding valves 15 and 11 are respectively arranged on pipelines 14 and 10 connected between the degassing vacuum box 1 and the pouring vacuum box 7 and between the first vacuum pump 1 and the second vacuum pump 9 so as to control the forming time of the vacuum degree in the boxes.

3. And (3) casting molding: casting molding is carried out in a vacuum-pumping device; starting a second vacuum pump 9 10min in advance to enable the pouring vacuum box 7 to be in a vacuum state; after the bubbles are removed in the previous step, two valves 3 and 5 on the pouring pipe are opened, the resin pouring material automatically flows into a silica gel mold 6 in a pouring vacuum box 7 under the action of gravity, and the resin pouring material is maintained for 24 hours in a constant vacuum environment to be cured and molded.

4. Demolding and maintaining: and taking the test piece solidified and formed in the step out of the casting vacuum box 7, demolding, and curing in a drying oven at 70 ℃ for 48 hours to finish the manufacture of the test piece.

5. Preparation before the test: before the mechanical test, the test piece needs to be placed in a freezer at the temperature of minus 20 ℃ for 24 hours, the test piece is taken out and then is repeatedly immersed in the liquid glycerol monooleate aerosol for 2 times, the whole test piece needs to be immersed below the liquid level, and after the test piece is taken out, no liquid flows, so that the test piece can be used for the test. The test piece with high transparency thus fabricated is shown in fig. 6.

The vacuum pumping device comprises the following specific operation steps: (1) before use, the valves 15, 3, 5 and 11 and the pressure release valves 13 and 8 are closed, then the valves 3, 5 and 11 are opened, and air in the two vacuum boxes is exhausted completely, so that the whole device is in a vacuum state; (2) closing the valves 3, 5 and 11, opening the pressure release valve 13 to allow the degassing vacuum box 1 to be filled with air, opening the degassing vacuum box, pouring the resin casting material into the measuring cup 2, closing the pressure release valve 13, opening the valve 15, and closing the valve 15 after vacuumizing is finished; (3) the valves 3, 5 are opened to allow the resin casting material to flow into the silica gel mold 6 in the casting vacuum box 7, waiting for its initial curing.

The vacuumizing device can ensure that the test piece is completely vacuum, can fully remove the castable and air bubbles inside and on the outer surface of the test piece, and ensures high transparency of the test piece to the maximum extent (see fig. 6). Meanwhile, the comparative test conducted at the same time revealed that the resin test piece cast under the conventional conditions other than the vacuum environment contained a large amount of air bubbles inside (as shown in fig. 4).

Example two

The example discloses a simulation test method based on a high-transparency rock-like resin test piece (taking the built-in single-crack resin test piece prepared by the method of the first example as an example):

1. before the mechanical test is started, soaking the test piece in an external fogging agent solution (glycerol monooleate) for 2 times, taking out the test piece before the test, and drying the test piece;

2. placing the test piece in the right center of the press machine, and adjusting the bearing plate to enable the test piece to be stressed uniformly;

3. and starting the press machine, and controlling the displacement speed to be 0.02mm/s by adopting a displacement loading mode until the test piece is damaged.

In the mechanical test process, the observation of the crack expansion and evolution process inside the test piece is a key point, the crack expansion and the test piece deformation and evolution inside the test piece are perfectly shown by the high-transparency test piece manufactured in the first embodiment of the application, and the mechanical test effect is very good. In order to observe the midway phenomenon of the test, a group of test pieces are respectively loaded to different times, the internal crack expansion stage is different at the moment, the internal crack expansion phenomenon of the test pieces at different stages can be observed, in addition, a group of test pieces are loaded to be completely damaged, and the deformation damage rule of the test pieces is observed.

The mechanical test shows that the fracture expansion of the test piece under uniaxial compression is subjected to four stages of fracture compaction, elastic deformation, crack expansion and communication and crack accelerated expansion to cause overall instability of the test piece: the first stage is an initial compaction stage; the second stage is an elastic deformation stage, wrapped wing cracks are generated at the upper end part and the lower end part of the prefabricated crack, and the crack is expanded as shown in figure 7 (a) when the stage is finished; in the third stage, the crack propagation penetrating stage is that the wrapped wing crack propagates along the crack edge in a curling surface manner towards the direction of the principle prefabricated crack to form a symmetrical petal-shaped crack with a larger scale, as shown in fig. 7 (b); the fourth stage is a crack accelerating and expanding stage, wherein the petal-shaped cracks and the vertical cracks continue to expand along the loading direction, and the test piece is heard to give an intensive snap sound until the test piece is split, as shown in fig. 7 (c), and a typical schematic diagram of the four stages is shown in fig. 7.

Although preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the present application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the invention in the present application. Thus, if such modifications and variations to the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include such modifications and variations.

Claims (7)

1. A method for manufacturing a high-transparency rock-like resin test piece is characterized by comprising the following steps:

(1) Preparing a castable: uniformly mixing epoxy resin and a curing agent according to a certain proportion to form a mixture, adding a transparent nucleating agent sorbitol substance according to 0.2-0.9% of the mass of the mixture to improve the transparency, adding an internal fogging agent glycerol monooleate according to 0.05-0.15% of the mass of the mixture to play a long-acting antifogging effect, and finally uniformly mixing to form a castable material;

(2) Preheating and degassing: preheating the casting material obtained in the previous step in a constant-temperature water bath at 40-50 ℃ for 10-20 min to reduce viscosity and facilitate discharge of bubbles, and then carrying out vacuumizing treatment for 15-25 min to fully eliminate the bubbles in the casting material;

(3) And (3) casting molding: pouring the degassed casting material into a corresponding silica gel mold in a vacuum environment, and maintaining in a constant vacuum environment to solidify and mold the casting material; spraying a layer of dry release agent on the inner surface of the silica gel mold to ensure the surface smoothness of a poured test piece and the generation of bubbles on the surface;

(4) Demolding and maintaining: demoulding the test piece which is solidified and formed in the previous step, and (5) curing for 45-50 h in a drying environment at 65-75 ℃ to obtain the product.

2. The method for manufacturing a high-transparency rock-like resin test piece according to claim 1, wherein the epoxy resin is YD-127 type resin, the curing agent is TB-2105 type curing agent, and the mass ratio of the epoxy resin to the curing agent is 100:38 to obtain a mixture.

3. The method for manufacturing the high-transparency rock-like resin test piece according to claim 1, wherein the vacuum-pumping treatment and the casting molding are both performed in a vacuum-pumping device, and the vacuum-pumping device comprises a degassing vacuum box with a measuring cup arranged therein and a casting vacuum box with a silica gel mold arranged therein; a corresponding pouring pipe is arranged between the bottom of the measuring cup and the pouring port of the silica gel mold; the degassing vacuum box and the pouring vacuum box are respectively connected with corresponding vacuum sources through corresponding pipelines, and the degassing vacuum box and the pouring vacuum box have position height difference, so that pouring materials in the measuring cup automatically flow into the silica gel mold through the pouring pipe.

4. The method for manufacturing a high-transparency rock-like resin test piece according to claim 3, wherein valves are respectively arranged at corresponding positions on the outer sides of the vacuum boxes at the two ends of the pouring tube so as to control the pouring time; the degassing vacuum box and the pouring vacuum box are respectively provided with corresponding pressure relief valves so as to realize the necessary re-pressure in the boxes; and corresponding valves are respectively arranged on pipelines connected between the degassing vacuum box, the pouring vacuum box and the vacuum source so as to control the forming time of the vacuum degrees in the boxes.

5. The method for manufacturing a high-transparency rock-like resin test piece according to claim 1, wherein the transparent nucleating agent is NP-818.

6. The method for manufacturing a high-transparency rock-like resin test piece according to claim 1, wherein the dry mold release agent is SEA410 composed of silicone oil and a silicone oil solvent.

7. A simulation test method based on the high-transparency rock-like resin test piece of claim 1, characterized by comprising the steps of:

(1) Placing the high-transparency rock-like resin test piece prepared in the claim 1 in a freezer at the temperature of-18 to-22 ℃ for at least 20 hours so as to enable the test piece to have rock-like hard brittleness;

(2) And taking out the frozen high-transparency rock resin test piece, repeatedly immersing the test piece into the external fogging agent glycerol monooleate for 1-2 times, taking out the test piece, draining until no liquid flows, and carrying out a rock mechanics simulation test according to a conventional method or a designed method.

Images