CN114261093B - Post-processing method for improving performance of 3D printing rock mass - Google Patents
Post-processing method for improving performance of 3D printing rock mass Download PDFInfo
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- CN114261093B CN114261093B CN202210102641.2A CN202210102641A CN114261093B CN 114261093 B CN114261093 B CN 114261093B CN 202210102641 A CN202210102641 A CN 202210102641A CN 114261093 B CN114261093 B CN 114261093B
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- 239000011435 rock Substances 0.000 title claims abstract description 125
- 238000010146 3D printing Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012805 post-processing Methods 0.000 title claims description 7
- 239000003822 epoxy resin Substances 0.000 claims abstract description 56
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 56
- 238000001035 drying Methods 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 26
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- 239000011259 mixed solution Substances 0.000 claims description 14
- 239000003085 diluting agent Substances 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000004952 Polyamide Substances 0.000 claims description 5
- 229920002647 polyamide Polymers 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 claims description 4
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical group CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 4
- LCFVJGUPQDGYKZ-UHFFFAOYSA-N Bisphenol A diglycidyl ether Chemical compound C=1C=C(OCC2OC2)C=CC=1C(C)(C)C(C=C1)=CC=C1OCC1CO1 LCFVJGUPQDGYKZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 14
- 239000000843 powder Substances 0.000 description 17
- 239000004033 plastic Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
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- 229920006395 saturated elastomer Polymers 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007849 furan resin Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229940099259 vaseline Drugs 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000011049 filling Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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Abstract
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a post-treatment method for improving the performance of a 3D printed rock mass. The method comprises the following steps: step 1, defoaming a modified epoxy resin solution to obtain a defoamed modified epoxy resin solution, and placing the defoamed modified epoxy resin solution into a sealing barrel for air extraction; step 2, weighing a 3D printing rock mass sample, drying the 3D printing rock mass sample at constant temperature to obtain a dried 3D printing rock mass sample, adding the dried 3D printing rock mass sample into a sealing barrel, and immersing the dried 3D printing rock mass sample into a modified epoxy resin solution after defoaming to obtain a first mixture; and 3, sequentially vacuumizing, standing and drying the first mixture to obtain the improved 3D printing rock mass sample. According to the invention, the 3D printed rock mass sample with various mechanical properties similar to the natural rock mass is manufactured, the result reliability of the 3D printed rock mass used for indoor test instead of the natural rock mass is improved, and a new method is provided for artificially restoring the natural rock mass.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a post-treatment method for improving the performance of a 3D printed rock mass.
Background
Transparent 3D printing technology has proven to be a powerful method for preparing complex structure samples, which technology has attracted extensive attention and application in many fields and its advantages have been applied in the field of fractured rock mass. The rock mass sample containing internal defects can be rapidly printed by using a 3D printing technology, the high consistency among the samples can be ensured, and the problems of microcracks, low accuracy of the precast cracks and difficult precast crack manufacture caused by the fact that the precast cracks are produced by natural rock are solved.
Different from the methods of pressing, forging, casting and the like adopted by the traditional forming technology, the principle of the 3D printing technology is that after a three-dimensional digital model is built by a computer, a component is printed by superposition by an extremely thin physical layer, so that most 3D printing models have layering phenomenon, the phenomenon can influence the anisotropic characteristics of 3D printing rock mass, the anisotropic characteristics of the 3D printing rock mass are different from those of a natural rock mass, and adverse results are caused to experiments carried out by using the 3D printing rock mass to replace the natural rock mass.
The 3D printing of rock mass mostly uses powder and resin material, the resin as binder binding the powder layer by layer, so the strength of the printed rock mass model depends on the resin usage. However, the 3D printer nozzle is easily blocked due to excessive resin consumption, so that the resin consumption cannot be obviously increased in the actual 3D printing process. In general, the safe dosage range of the resin in the 3D printing process cannot enable the printed rock mass model to reach the strength of most natural rock masses.
The epoxy resin is a thermosetting high polymer, can be primarily cured within a few hours after being mixed with a curing agent, is a semitransparent solid, has the characteristics of low contractibility, high strength and the like, and can not react with other resins used in a 3D printing model. Therefore, the epoxy resin is used as a post-treatment material to carry out post-treatment on the 3D printing rock mass, so that the strength of the 3D printing rock mass can be improved on the premise of not affecting other components of the 3D printing rock mass, and meanwhile, the layering phenomenon is effectively eliminated. However, since epoxy resin is not high in fluidity and is primarily cured in a short time, how to post-treat a 3D printed rock mass with epoxy resin is a key problem.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a post-processing method for improving the performance of a 3D printing rock mass, which can improve the strength of a 3D printing rock mass model, effectively eliminate layering phenomenon of the 3D printing rock mass, manufacture a 3D printing rock mass sample with various mechanical properties similar to the height of a natural rock mass by the method, improve the result reliability of the 3D printing rock mass for replacing the natural rock mass for indoor test, and provide a further new method for artificially restoring the natural rock mass.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a post-treatment method for improving the performance of 3D printing rock mass, comprising the following steps:
step 1, defoaming a modified epoxy resin solution to obtain a defoamed modified epoxy resin solution, and placing the defoamed modified epoxy resin solution into a sealing barrel for air extraction;
step 2, weighing a 3D printing rock mass sample, drying the 3D printing rock mass sample at constant temperature to obtain a dried 3D printing rock mass sample, and adding the dried 3D printing rock mass sample into the sealing barrel to obtain a first mixture, wherein the defoamed modified epoxy resin solution submerges the dried 3D printing rock mass sample;
and 3, sequentially vacuumizing, standing and drying the first mixture to obtain the improved 3D printing rock mass sample.
Preferably, the preparation process of the modified epoxy resin specifically comprises the following steps:
firstly, mixing and uniformly stirring epoxy resin and a curing agent at room temperature to obtain a second mixed solution;
secondly, adding an active diluent into the second mixed solution, and uniformly stirring to obtain a third mixed solution;
and finally, adding absolute ethyl alcohol into the third mixed solution, and uniformly stirring to obtain a modified epoxy resin solution.
Preferably, the stirring time is 5-8min, and the stirring speed is 2500-3500r/min.
Preferably, the modified epoxy resin comprises an epoxy resin, a curing agent, a reactive diluent and absolute ethyl alcohol; the mass ratio of the epoxy resin to the curing agent to the reactive diluent to the absolute ethyl alcohol is 1:1:0.03:0.4.
preferably, the epoxy resin is bisphenol a diglycidyl ether; the curing agent is polyamide; the reactive diluent is propylene oxide butyl ether.
Preferably, the pumping rate in step 1 is 3.6-5.4m 3 /h。
Preferably, the drying time in the step 2 is 2-2.5h, and the drying temperature is 110 ℃.
Preferably, the vacuum pressure of the vacuumized air in the step 3 is-0.1 MPa.
Preferably, the time of standing in the step 3 is 72-96 hours.
Preferably, the drying time in the step 3 is 5.5-6 hours, and the drying temperature is 105 ℃.
The invention has the beneficial effects that:
the invention provides a post-treatment method for improving the performance of a 3D printed rock mass, which avoids the limit of the spraying resin consumption of a 3D printer, obtains high-fluidity and high-temperature-resistant modified epoxy resin by preparing the modified epoxy resin, and utilizes a vacuum saturation principle to infiltrate the modified epoxy resin into a compact 3D printed rock mass sample to prepare the 3D printed rock mass sample with higher strength, so that the 3D printed rock mass sample can simulate natural rock with a larger strength range; the layering defect of the 3D printing rock mass sample is eliminated, the 3D printing rock mass sample which is highly consistent with various characteristics of natural rock is obtained, a new means is provided for the rock room test, and the application of the 3D printing technology in the rock room test is promoted.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the steps of a post-processing method of the present invention for improving the performance of a 3D printed rock mass;
FIG. 2 is a schematic diagram of the defoaming treatment of the modified epoxy resin solution according to the present invention, wherein FIG. 2 (a) is a schematic diagram of the air extraction 30s operation and FIG. 2 (b) is a schematic diagram of the air release equilibrium air pressure operation;
FIG. 3 is a schematic diagram of the operation of the improved treatment of a 3D printed rock sample according to the present invention, wherein FIG. 3 (a) is a schematic diagram of the operation of pumping air to a barometer orientation of-0.1 MPa, FIG. 3 (b) is a schematic diagram of the operation of standing for 2 hours, FIG. 3 (c) is a schematic diagram of the operation of air release balancing, and FIG. 3 (D) is a schematic diagram of the operation of taking out the sample, scraping off the excess solution, and drying in an oven after preliminary hardening;
FIG. 4 is a schematic diagram of the operation of 3D printing of a 3D rock mass sample in accordance with the present invention;
FIG. 5 (a) is a schematic cross-sectional view of a 3D printed rock mass sample without modification; FIG. 5 (b) is a schematic cross-sectional view of a modified 3D printed rock mass specimen in accordance with the present invention.
Wherein, 100: a vacuum saturation barrel; 200: a plastic barrel; 300: a modified epoxy resin solution; 400:3D printing a rock mass sample; 500: an electric heating constant temperature drying oven; 600: improving a 3D printed rock mass sample; 700: a computer control system; 800: a forming cylinder; 801: a forming platform; 802: a forming cylinder working piston; 803: molding a test piece; 900: a powder feeding cylinder; 901: a powder feeding platform; 902: a powder feeding cylinder working piston; 903: a powder feeding roller; 1000: a cement supply cylinder; 1001: a spray head.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.
The invention provides a post-processing method for improving the performance of a 3D printing rock mass, which comprises the following steps:
step 1, defoaming a modified epoxy resin solution to obtain a defoamed modified epoxy resin solution, and placing the defoamed modified epoxy resin solution into a sealing barrel for air extraction;
specifically, the modified epoxy resin comprises epoxy resin, a curing agent, a reactive diluent and absolute ethyl alcohol; the mass ratio of the epoxy resin to the curing agent to the reactive diluent to the absolute ethyl alcohol is 1:1:0.03:0.4. wherein the epoxy resin is bisphenol A diglycidyl ether; the curing agent is polyamide; the reactive diluent is propylene oxide butyl ether;
the preparation process of the modified epoxy resin specifically comprises the following steps: firstly, mixing and uniformly stirring epoxy resin and a curing agent at room temperature to obtain a second mixed solution; secondly, adding an active diluent into the second mixed solution, and uniformly stirring to obtain a third mixed solution; and finally, adding absolute ethyl alcohol into the third mixed solution, and uniformly stirring to obtain a modified epoxy resin solution.
In the preparation process of the modified epoxy resin, the stirring time is 5-8min, and the stirring speed is 2500-3500r/min; the air extraction rate is 3.6-5.4m 3 And/h. Step 2, weighing a 3D printing rock mass sample, drying the 3D printing rock mass sample at constant temperature to obtain a dried 3D printing rock mass sample, and adding the dried 3D printing rock mass sample into the sealing barrel to obtain a first mixture, wherein the defoamed modified epoxy resin solution submerges the dried 3D printing rock mass sample;
wherein, the drying time in the step 2 is 2-2.5h, the drying temperature is 110 ℃, the drying adopts a 202-2 type electrothermal constant temperature drying oven manufactured by Shanghai Bib instruments Co., ltd, and the heating rate of the drying oven is 2 ℃/s; the 3D printed rock mass sample contains sand powder and resin, and the technical process adopted by the 3D printing is Three Dimensional Printing (three-dimensional printing) process.
Step 3, sequentially vacuumizing, standing and drying the first mixture to obtain an improved 3D printed rock mass sample;
further, the vacuum pressure of the vacuum pumped in the step 3 is minus 0.1MPa; standing for 72-96h in the step 3; the drying time in the step 3 is 5.5-6h, and the drying temperature is 105 ℃.
Referring to fig. 1 to 4, the specific operation procedure of the present invention for preparing the improved 3D printed rock mass sample using the above-described post-processing method for improving the performance of the 3D printed rock mass is as follows:
1) 400g of imported 828 epoxy resin is weighed and poured into a plastic bucket 200 with the length of 15 multiplied by 15cm, 400g of polyamide curing agent is added into the plastic bucket 200, the polyamide curing agent is stirred for 5-8min by adopting an electric stirrer, the rotating speed of the stirrer is 3500r/min, 12g of propylene oxide butyl ether is added into the stirred mixed solution and is stirred for 3-5min by adopting the electric stirrer, 160g of absolute ethyl alcohol is added into the mixed solution and is stirred for 3-5min by adopting the electric stirrer, and the modified epoxy resin solution 300 is obtained.
2) And preparing a 3D printed rock mass sample with the bottom length of 50mm, the bottom width of 30mm and the height of 100mm by adopting a 3D printer, wherein the 3D printer adopts a KOCEL AJS 2500A 3D printer, the printing process is a Three Dimensional Printing (three-dimensional printing) process, and the printing material adopts Baozhu sand and furan resin glue.
The preparation process of the 3D printing rock mass sample comprises the following steps: first, the computer control system 700 of the 3D printer recognizes a three-dimensional model structure (sequentially dividing the structure into a plurality of two-dimensional planar thin layers according to a certain thickness, and then recognizing point location information of each planar thin layer from bottom to top); secondly, filling the powder feeding cylinder 900 and the cementing agent supply cylinder 1000 with the precious sand and the furan resin glue respectively, wherein a powder feeding platform 901 in the powder feeding cylinder 900 is arranged at the bottommost layer, and a forming platform 801 in the forming cylinder 800 is arranged at the topmost layer; thirdly, the powder feeding cylinder working piston 902 drives the powder feeding platform 901 to rise for one layer to slightly eject the powder; fourth, the powder feed roller 903 pushes the powder in the powder feed cylinder 900 in a rolling manner onto the forming table 801 in the forming cylinder 800, during which process the powder feed roller 903 slightly compacts the material; fifth, the sprinkler 1001 sprays cement according to the point location information identified by the computer control system 700; sixth, the forming cylinder working piston 802 drives the forming platform 801 to descend by one planar sheet thickness; seventh, the steps of the first to fifth are repeated, and finally the 3D printed rock mass sample 400 is manufactured.
3) The 3D rock mass sample 400 is put into a 202-2 type electrothermal constant temperature drying oven 500 manufactured by Shanghai Bib instruments Co., ltd, heated and dried for 2.5 hours, the heating temperature is 105 ℃, the heating rate is 2 ℃/s, and after the drying is finished, the 3D printed rock mass sample is taken out and cooled to room temperature in the indoor environment for standby.
4) The plastic tub 200 filled with the modified epoxy resin solution 300 is placed in a vacuum saturated tub 100, the vacuum saturated tub 100 is a cylinder with a size of 25 x 25cm, a circle of vaseline is smeared at a sealing strip of the tub cover of the vacuum saturated tub 100, the tub cover is covered, and the tub cover is slowly rotated for one circle. The air outlet valve connected with the external container on the barrel cover of the vacuum saturation barrel 100 is screwed down, the air outlet valve connected with the air extracting pump on the barrel cover of the vacuum saturation barrel 100 is loosened, the air extracting pump is opened to start air extraction, and the air extracting rate of the air extracting pump is 5.4m 3 And/h, after 30s of air suction, closing the air suction pump, screwing the air outlet valve of the air suction pump on the barrel cover, loosening the air outlet valve of the external container on the barrel cover, uncovering the barrel cover after the internal and external air pressures of the vacuum saturated barrel are balanced, and taking out the plastic barrel 200 filled with the modified epoxy resin solution 300.
5) The two dried 3D printed rock mass samples were slowly placed into the plastic bucket 200 filled with the modified epoxy resin solution 300, ensuring that the modified epoxy resin solution 300 completely immersed the 3D printed rock mass sample 400. The plastic tub 200 is put into the vacuum saturated tub 100 again, a circle of vaseline is smeared at the sealed strip of the tub cover of the vacuum saturated tub 100, the tub cover is covered, and the tub cover is slowly rotated for a circle. The valve of the air outlet connected with the external container on the barrel cover of the vacuum saturation barrel 100 is screwed down, the valve of the air outlet connected with the air pump in the morning on the barrel cover of the vacuum saturation barrel 100 is loosened, the air pump is opened to start air suction, and the air suction rate of the air pump in the morning is 3.6m 3 And/h. When the barometer on the barrel cover shows that the air pressure in the barrel is minus 0.1MPa, screwing a valve on the barrel cover, which is connected with the air outlet of the air pump, standing the whole vacuum saturated barrel 100 for 2.5h, and after the standing time is over, loosening the air outlet valve on the barrel cover, which is connected with an external container, until the air outlet valve is leveledThe cover is opened after the internal and external air pressures of the vacuum saturated barrel are balanced, and the plastic barrel 200 is taken out.
6) The 3D printed rock mass sample 400 was taken out of the plastic tub 200, and after the surplus solution around the 3D printed rock mass sample 400 was scraped off by a wiper blade, the 3D printed rock mass sample 400 was placed on a plastic mat, which was required to be placed in a ventilated place, for preliminary hardening for 3 days.
7) And (3) placing the preliminarily hardened 3D printed rock mass sample 400 into the electrothermal constant-temperature drying oven 500 for drying for 6 hours, wherein the drying heating temperature is 105 ℃, the heating rate of the electrothermal constant-temperature drying oven is 2 ℃/s, and taking out the improved 3D printed rock mass sample 600 after the drying is finished.
8) The above test procedure was repeated 5 times to obtain five sets of test results, respectively, as shown in tables 1 and 2.
The modified 3D printed rock mass sample 600 and the 3D printed rock mass sample without modification prepared in the above examples were tested for their molar hardness, cohesion, static uniaxial compressive strength test, static tensile strength, and the results are shown in table 1:
table 1 results of performance testing of modified 3D printed rock mass samples
Table 2 unmodified 3D printed rock mass sample performance test results
From table 1, the strength of the improved 3D printing rock mass sample prepared by the post-treatment method for improving the performance of the 3D printing rock mass disclosed by the invention is greatly improved, and each physical and mechanical property is similar to that of natural rock, so that a new method is provided for the physical experiment in a rock room, and the application of the 3D printing technology in the test in the rock room is promoted.
As can be seen from comparing the schematic cross-sectional view of the 3D printed rock sample which is not subjected to the improvement treatment in FIG. 5 (a) with the schematic cross-sectional view of the improved 3D printed rock sample in FIG. 5 (b), the improved 3D printed rock sample prepared in the embodiment of the invention eliminates layering phenomenon, has anisotropic characteristics more similar to those of a natural rock, so that the stress direction of the 3D printed rock is not limited any more when a mechanical test is performed, a new method is provided for the physical test in a rock room, and the application of the 3D printing technology in the rock room test is promoted.
In summary, the post-treatment method for improving the performance of the 3D printed rock mass, provided by the invention, avoids the limit of the spraying resin consumption of a 3D printer, obtains the modified epoxy resin with high fluidity and high temperature resistance by preparing the modified epoxy resin, and utilizes the vacuum saturation principle to infiltrate the modified epoxy resin into a compact 3D printed rock mass sample to prepare the 3D printed rock mass sample with higher strength, so that the 3D printed rock mass sample can simulate natural rock with a larger strength range; the layering defect of the 3D printing rock mass sample is eliminated, the 3D printing rock mass sample which is highly consistent with various characteristics of natural rock is obtained, a new means is provided for the rock room test, and the application of the 3D printing technology in the rock room test is promoted.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. The post-processing method for improving the performance of the 3D printing rock mass is characterized by comprising the following steps of:
step 1, defoaming a modified epoxy resin solution to obtain a defoamed modified epoxy resin solution, and placing the defoamed modified epoxy resin solution into a sealing barrel for air extraction;
the modified epoxy resin comprises epoxy resin, a curing agent, a reactive diluent and absolute ethyl alcohol;
the mass ratio of the epoxy resin to the curing agent to the reactive diluent to the absolute ethyl alcohol is 1:1:0.03:0.4;
the epoxy resin is bisphenol A diglycidyl ether;
the curing agent is polyamide;
the reactive diluent is propylene oxide butyl ether;
step 2, weighing a 3D printing rock mass sample, drying the 3D printing rock mass sample at constant temperature to obtain a dried 3D printing rock mass sample, and adding the dried 3D printing rock mass sample into the sealing barrel to obtain a first mixture, wherein the defoamed modified epoxy resin solution submerges the dried 3D printing rock mass sample;
and 3, sequentially vacuumizing, standing and drying the first mixture to obtain the improved 3D printing rock mass sample.
2. The post-treatment method for improving the performance of 3D printed rock mass according to claim 1, wherein the preparation process of the modified epoxy resin specifically comprises:
firstly, mixing and uniformly stirring epoxy resin and a curing agent at room temperature to obtain a second mixed solution;
secondly, adding an active diluent into the second mixed solution, and uniformly stirring to obtain a third mixed solution;
and finally, adding absolute ethyl alcohol into the third mixed solution, and uniformly stirring to obtain a modified epoxy resin solution.
3. The post-treatment method for improving the performance of a 3D printed rock mass according to claim 2, wherein the stirring time is 5-8min and the stirring speed is 2500-3500r/min.
4. The post-treatment method for improving the performance of a 3D printed rock mass according to claim 1, wherein the rate of pumping in step 1 is 3.6-5.4m 3 /h。
5. The post-treatment method for improving the performance of a 3D printed rock mass according to claim 1, wherein the drying time in step 2 is 2-2.5 hours and the drying temperature is 110 ℃.
6. The post-treatment method for improving the performance of a 3D printed rock mass according to claim 1, wherein the vacuum pressure of the vacuuming in step 3 is-0.1 MPa.
7. The post-treatment method for improving the performance of a 3D printed rock mass according to claim 1, wherein the time of standing in step 3 is 72-96 hours.
8. The post-treatment method for improving the performance of a 3D printed rock mass according to claim 1, wherein the drying time in step 3 is 5.5-6 hours and the drying temperature is 105 ℃.
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| CN104515696A (en) * | 2014-12-09 | 2015-04-15 | 河海大学 | Method for preparation of columnar jointed rock mass similar material sample by 3D printing technology |
| CN109129934A (en) * | 2018-10-16 | 2019-01-04 | 武汉大学 | A method of enhancing 3D printing rock-like materials intensity and its mechanical property of improvement |
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| US20010002412A1 (en) * | 1996-11-07 | 2001-05-31 | John P. Kolarik | Decorative structurally enhanced impregnated porous stone product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104515696A (en) * | 2014-12-09 | 2015-04-15 | 河海大学 | Method for preparation of columnar jointed rock mass similar material sample by 3D printing technology |
| CN109129934A (en) * | 2018-10-16 | 2019-01-04 | 武汉大学 | A method of enhancing 3D printing rock-like materials intensity and its mechanical property of improvement |
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