CN108252336B - Method for constructing discontinuous three-dimensional slope indoor model test by 3D printing technology - Google Patents
Method for constructing discontinuous three-dimensional slope indoor model test by 3D printing technology Download PDFInfo
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Abstract
The invention provides a method for constructing a discontinuous three-dimensional slope indoor model test by a 3D printing technology. The method comprises the steps of member modeling, powder preparation, rock block printing, bonding modeling and the like. By adopting the method to carry out the slope indoor model test, the slope models are quickly and conveniently manufactured, the models are proportionally enlarged and reduced, the damage process of the discontinuous rock slope with a large number of joint surfaces can be truly reflected, the model test meets the requirements of a similar theory, the result is more true and reliable, and the repeatability is strong.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a method for constructing a discontinuous three-dimensional slope indoor model test by a 3D printing technology.
Background
China is a country in which geological disasters frequently occur, and particularly landslides and other side slope unstable geological disasters often cause great loss to production life and personal and property safety of people. The mass collapse and landslide caused by the earthquake in Wenchuan in 2008 results in tragedy that 3 thousands of people are in distress or missing. Meanwhile, landslide geological disasters also have the characteristics of high occurrence frequency, large influence range, difficulty in prediction and the like. The method makes the research on the instability motion mode, the reliability analysis method and the instability mechanism of the slope become a major scientific problem to be solved urgently, directly influences the links of design, construction, operation and the like in geotechnical engineering practice, and has great practical engineering value.
At present, the research methods aiming at the side slope instability geological disaster include a field in-situ test method, an indoor model test method and a numerical simulation method, wherein the indoor model test method is an economical and reliable method. The theoretical basis of the indoor slope model test is a similar theory, but the similarity of the joint distribution and the defect structure in the slope models with different sizes cannot be ensured by the traditional test method, and the similarity of the test results is difficult to ensure. Particularly, for model tests of discontinuous rock slopes with a large number of internal joint surfaces, at present, domestic and foreign researches are in a blank stage, the traditional indoor model tests cannot ensure that constructed slope models are discontinuous, and the dynamics similarity theory of the slopes cannot be developed. However, the discontinuous surface is a key factor causing slope instability, the extension and the penetration of the discontinuous surface in the rock slope are decisive factors causing the slope instability, and the neglect of a large number of existing discontinuous surfaces causes great difference in instability mechanisms of indoor model tests and actual landslide disasters in engineering. In consideration of the key role of the discontinuous surface in landslide geological disaster analysis, the method for developing a novel method capable of constructing a series of discontinuous body three-dimensional slope indoor model tests with different sizes and shapes has important practical significance.
Disclosure of Invention
The invention aims to provide a method for constructing a discontinuous three-dimensional slope indoor model test by a 3D printing technology, which aims to solve the problems in the prior art.
The technical scheme adopted for achieving the aim of the invention is that the method for constructing the discontinuous three-dimensional slope indoor model test by the 3D printing technology comprises the following steps:
1) and (4) constructing a full three-dimensional slope digital model of the reduced scale by using a computer according to the real rock slope physical model. And (4) constructing a full three-dimensional slope digital model of the reduced scale by using a computer according to the real rock slope physical model. And obtaining a plurality of independent rock blocks formed by dividing the complete three-dimensional slope digital model by the design joint surface through computer aided design software. And respectively exporting the independent rock blocks as STL model files.
2) Preparing rock slope similar material powder. Wherein, the raw materials of the powder comprise sandstone powder, barite powder and gypsum powder.
3) And (5) building a 3D printing device. Wherein, the computer is connected with the 3D printing device through a data line. The 3D printing device comprises a cementing agent supply cylinder, a printing spray head, a forming chamber, a powder conveying roller shaft, a moving system and a powder supply cylinder. The printing spray head is arranged above the forming chamber. The printing spray head is connected with the cementing agent supply cylinder through a conveying pipe. The powder in the powder supply cylinder is conveyed to the molding chamber through the powder conveying chamber and the powder feeding roller shaft. The printing nozzle is positioned at a pre-printing position through a moving system.
4) And printing the rock block. Layering the plurality of STL model files obtained in the step 1) through three-dimensional slicing software slicing, and inputting the layered STL model files into a 3D printing device. And the 3D printing device converts the three-dimensional model into three-dimensional coordinates, and adjusts the position of the printing nozzle according to the three-dimensional coordinates. When powder in the forming chamber is accumulated to the designed layer thickness, the mobile system positions the printing nozzle to the preprinting position point for cementing forming. And after printing is finished, controlling the moving system to position the printing nozzle to another pre-printing position. The above steps are repeated to cement the powders together to form a rock mass. And repeating the steps until all the rock blocks are printed.
5) And (3) splicing the rock blocks printed in the step (4) according to design by using mortar and cement paste to form a discontinuous body slope model containing a joint surface. Wherein, the mortar and the cement paste form a joint surface. The mortar, the cement paste and the rock mass are adhered into a whole to jointly form a three-dimensional slope model.
6) And maintaining the three-dimensional slope model at room temperature to enable the strength of the joint surface to meet the expected requirement.
7) And arranging the three-dimensional slope model on a small vibrating table or in an organic glass water tank, performing seismic or hydraulic simulation test, and acquiring data by using a CCD (charge coupled device) continuous camera. Wherein, the CCD continuous camera is connected with the computer through a data line.
Further, the moving system comprises three direction axes of an X-direction moving axis, a Y-direction moving axis and a Z-direction moving axis. The Z-direction moving shaft is arranged on a bearing platform of the 3D printing device. The Z-direction moving shaft is vertically arranged, and the X-direction moving shaft and the Y-direction moving shaft are horizontally arranged. The Z-direction moving shaft is vertically connected with the X-direction moving shaft, and the X-direction moving shaft is vertically connected with the Y-direction moving shaft. The printing nozzle is connected with the Y-direction moving shaft through a sliding wheel. The Z-direction moving shaft is connected with the X-direction moving shaft through a sliding wheel. The X-direction moving shaft is connected with the Y-direction moving shaft through a sliding wheel.
Further, in the step 1), the distribution form of the joint surface is designed according to the research requirement or is obtained in the actual engineering slope through a surface profile scanning technology.
Further, the rock mass is an irregularly shaped mass.
Further, the mortar strength is not higher than 5 MPa.
Further, the earthquake dynamics simulation test in the step 7) specifically comprises the following steps:
a) and fixing the three-dimensional slope model on the vibrating table panel by using a clamp. And arranging a CCD continuous camera capable of observing the whole model on the front view surface of the three-dimensional slope model.
b) Inputting the preset vibration frequency spectrum into the small-sized vibration table, setting the vibration frequency spectrum of the small-sized vibration table, and starting the small-sized vibration table. And starting a continuous shooting function of the CCD continuous camera, setting the interval of continuous shooting to be 0.2s, starting shooting the deformation motion process of the slope model by the CCD continuous camera, and transmitting data back to the computer.
c) By using the image processing software, data such as the deformation of the slope, the displacement of the slide block, the speed of the slide block and the like between different moments can be obtained.
Further, in the step 7), performing a hydraulic simulation test, and arranging the three-dimensional slope model in the organic glass water tank. The organic glass water tank is integrally a rectangular box body without a cover. And a drain hole is formed at the bottom of the organic glass water tank. Water is injected from an opening at the upper end of the organic glass water tank, and is drained through a drain hole at the bottom, so that the water level lifting process is simulated.
The technical effects of the invention are undoubted:
A. the slope model containing a large number of joints can be naturally obtained by splicing the rock blocks, the rock joint slope in the real engineering is truly restored, the requirements of a similar theory are met, and the reliability of a data result is improved;
B. the vibration table and the water tank can simulate the instability process of the slope model under different test working conditions, and are used for simulating the damage mode and the motion process of the slope under the action of earthquake motion or hydraulic power in actual engineering;
C. the CCD continuous camera is used for collecting data to realize non-contact measurement, and data such as key block position, slope deformation, landslide body movement speed, movement distance, accumulation area and the like can be obtained, so that the method is visual and accurate.
Drawings
FIG. 1 is a schematic structural diagram of a 3D printing apparatus;
FIG. 2 is a schematic structural view of a three-dimensional slope model in example 1;
fig. 3 is a schematic structural view of a three-dimensional slope model in embodiment 2;
FIG. 4 is a schematic diagram of a seismometric simulation test;
FIG. 5 is a schematic view of a structure of an organic glass water tank;
FIG. 6 is a flow chart of the experiment.
In the figure: the device comprises a cementing agent supply cylinder 1, a conveying pipe 2, a printing spray head 3, a three-dimensional slope mold 4, a rock block 401, a joint surface 402, a forming chamber 5, a powder supply chamber 6, a powder feeding roller shaft 7, an X-direction moving shaft 8, a Y-direction moving shaft 9, a Z-direction moving shaft 10, a powder supply cylinder 11, a powder recovery cylinder 12, a computer 13, a CCD continuous camera 14, a small vibration table 15 and an organic glass water tank 16.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
Example 1:
the embodiment discloses a method for constructing a discontinuous three-dimensional slope indoor model test by a 3D printing technology, and the method comprises the following steps of:
1) and constructing a full three-dimensional slope digital model of the reduced scale by using the computer 13 according to the real rock slope physical model. The digital slope model is composed of a joint surface and a plurality of independent rock blocks, and the three-dimensional appearance of each independent rock block is set in computer aided design software. And obtaining a plurality of independent rock blocks formed by dividing the complete three-dimensional slope digital model by the design joint surface through computer aided design software. Exporting the independent rock blocks into model files with the suffix of a 'STL' format respectively. Wherein, the distribution form of the design joint surface is designed according to the research requirement.
2) Preparing rock slope similar material powder. Wherein, the raw materials of the powder comprise sandstone powder, barite powder and gypsum powder.
3) And (5) building a 3D printing device. Wherein the computer 13 is connected with the 3D printing device through a data line. Referring to fig. 1, the 3D printing apparatus includes a binder supply cylinder 1, a printing nozzle 3, a molding chamber 5, a powder conveying chamber 6, a powder feeding roller shaft 7, a moving system and powder supply cylinder 11, and a powder recovery cylinder 12. The printing nozzle 3 is arranged above the forming chamber 5. The moving system comprises three direction axes of an X-direction moving axis 8, a Y-direction moving axis 9 and a Z-direction moving axis 10. The Z-direction movement axis 10 is provided on a stage of the 3D printing apparatus. The Z-direction movement axis 10 is arranged vertically, and the X-direction movement axis 8 and the Y-direction movement axis 9 are arranged horizontally. The Z-direction moving shaft 10 is vertically connected with the X-direction moving shaft 8, and the X-direction moving shaft 8 is vertically connected with the Y-direction moving shaft 9. The printing nozzle 3 is connected with the Y-direction moving shaft 9 through a sliding wheel. The Z-direction moving shaft 10 and the X-direction moving shaft 8 are connected by a sliding wheel. The X-direction moving shaft 8 and the Y-direction moving shaft 9 are connected through a sliding wheel. The printing spray head 3 is connected with the cementing agent supply cylinder 1 through a conveying pipe 2. The powder in the powder supply cylinder 11 is conveyed to the molding chamber 5 through the powder conveying chamber 6 and the powder conveying roller shaft 7. The printing nozzle 3 is accurately positioned at a pre-printing position by a moving system.
4) Rock mass 401 is printed. And (3) slicing the three-dimensional digital model by the plurality of STL model files in the step 1) through open source three-dimensional slicing software Cura to obtain a two-dimensional plane required by a 3DP technology, and inputting the two-dimensional plane to a 3D printing device. The 3D printing device converts the three-dimensional model into three-dimensional coordinates, adjusts the position of the printing nozzle 3 according to the three-dimensional coordinates, and calculates the spatial position of the printing nozzle 3 at each printing moment. This spatial position is controlled by X, Y, Z three axes of movement. When powder in the forming chamber 5 is accumulated to the designed layer thickness, the moving system positions the printing nozzle 3 to the pre-printing position point for cementing forming. After the cementing printing is finished for one layer, the position of the printing nozzle 3 is raised according to a preset scheme, and then the second layer rock mass model is printed according to a preset path. The layers are consolidated layer by layer, and the powders are consolidated together to form the rock mass 401. And after printing is finished, controlling the moving system to position the printing nozzle 3 to another pre-printing position. The above steps are repeated to cement the powders together to form the rock mass 401. The above steps are repeated until all the rock pieces 401 are printed.
5) Referring to fig. 2, the rock masses 401 printed in step 4) are spliced according to design by using mortar and cement paste to form a discontinuous body slope model divided by joint surfaces. Wherein the mortar and grout form joint face 402. The mortar, the cement paste and the rock mass 401 are adhered into a whole to form the three-dimensional slope model 4 together.
6) Curing and forming: and (4) maintaining the three-dimensional slope model 4 at room temperature to enable the strength of the joint face 402 to meet the expected requirement.
7) The three-dimensional slope model 4 is arranged on a small vibration table 15 or in an organic glass water tank 16, and the instability process of the three-dimensional slope model 4 under the action of earthquake motion or water power is simulated. The CCD continuous camera 14 is fixed right in front of the three-dimensional slope model 4 in a focusing manner, and photographs of the slope model which is broken by sliding disassembly are taken at time intervals of 0.2 s. The CCD continuous camera is connected with the computer 13 through a data line, and the shot pictures are led into the picture processing software for processing. And obtaining the data of block displacement and block sliding speed of the side slope.
By adopting the method of the embodiment to carry out the slope indoor model test, the slope models are quickly and conveniently manufactured, the models are proportionally enlarged and reduced, the damage process of the discontinuous rock slope with a large number of joint surfaces can be truly reflected, the model test meets the requirements of a similar theory, the result is more true and reliable, and the repeatability is strong.
Example 2:
the embodiment discloses a method for constructing a discontinuous three-dimensional slope indoor model test by a 3D printing technology, which comprises the following steps:
1) and constructing a full three-dimensional slope digital model of the reduced scale by using the computer 13 according to the real rock slope physical model. And obtaining a plurality of independent rock blocks formed by dividing the complete three-dimensional slope digital model by the design joint surface through computer aided design software. Exporting the independent rock blocks into model files with the suffix of a 'STL' format respectively. The distribution form of the designed joint surface is obtained by a surface profile scanning technology, and the length, the trend, the width and the distribution position in the slope of the joint are generated according to a real distribution rule.
2) Preparing rock slope similar material powder. Wherein, the raw materials of the powder comprise sandstone powder, barite powder and gypsum powder.
3) And (5) building a 3D printing device. Wherein, the computer 13 is connected with a data interface of the 3D printing device through a data line. The 3D printer performs 3D printing operations using a 3DP (three dimensional printing) process. The 3D printing device comprises a control chip, a bearing platform, a cementing agent supply cylinder 1, a printing spray head 3, a forming chamber 5, a powder conveying chamber 6, a powder conveying roller shaft 7, a moving system, a powder supply cylinder 11 and a powder recovery cylinder 12. The powder conveying chamber 6 and the forming chamber 5 are integrally a rectangular box body without a cover. The powder conveying chamber 6 and the forming chamber 5 are both arranged on the bearing platform and are separated by a partition plate. The powder supply cylinder 11 is disposed below the powder conveying chamber 6, and is connected to the powder conveying chamber 6. The powder recovery cylinder 12 is disposed below the molding chamber 5 and connected to the molding chamber 5. The moving system comprises three direction axes of an X-direction moving axis 8, a Y-direction moving axis 9 and a Z-direction moving axis 10. The mobile system is controlled by an electronic chip. The Z-direction movement axis 10 is provided on a stage of the 3D printing apparatus. The Z-direction movement axis 10 is arranged vertically, and the X-direction movement axis 8 and the Y-direction movement axis 9 are arranged horizontally. The Z-direction moving shaft 10 is vertically connected with the X-direction moving shaft 8, and the X-direction moving shaft 8 is vertically connected with the Y-direction moving shaft 9. The printing nozzle 3 is connected with the Y-direction moving shaft 9 through a sliding wheel. The Z-direction moving shaft 10 and the X-direction moving shaft 8 are connected by a sliding wheel. The X-direction moving shaft 8 and the Y-direction moving shaft 9 are connected through a sliding wheel. The printing nozzle 3 is arranged above the forming chamber 5. The printing spray head 3 is connected with the cementing agent supply cylinder 1 through a conveying pipe 2. The powder in the powder supply cylinder 11 is conveyed to the molding chamber 5 through the powder conveying chamber 6 and the powder conveying roller shaft 7. The printing nozzle 3 is positioned precisely above the pre-printing position by a moving system.
4) Rock mass 401 is printed. And (3) slicing the three-dimensional digital model by the plurality of STL model files in the step 1) through open source three-dimensional slicing software Cura to obtain a two-dimensional plane required by a 3DP technology, and inputting the two-dimensional plane to a 3D printing device. The 3D printing device converts the three-dimensional model into three-dimensional coordinates, adjusts the position of the printing nozzle 3 according to the three-dimensional coordinates, and calculates the spatial position of the printing nozzle 3 at each printing moment. This spatial position is controlled by X, Y, Z three axes of movement. The powder in the powder supply cylinder 11 is shown sucked into the powder supply chamber 6 by vacuum suction and mixed well in the powder supply chamber 6. The mixed powder is pushed into the molding chamber 5 by the powder feed roller shaft 7. The rolling speed of the powder feeding roller shaft 7 is controlled by an electronic chip, so that the synchronization of the powder feeding thickness and the cementing forming speed can be ensured. When powder in the forming chamber 5 is accumulated to the designed layer thickness, the mobile system positions the printing nozzle 3 to the point of the preprinting position to extrude the cementing agent, and the cementing raw material powder is formed. After the cementing printing is finished for one layer, the position of the printing nozzle 3 is raised according to a preset scheme, and then the second layer rock mass model is printed according to a preset path. The layers are consolidated layer by layer, and the powders are consolidated together to form the rock mass 401. And after printing is finished, controlling the moving system to position the printing nozzle 3 to another pre-printing position. The above steps are repeated to cement the powders together to form the rock mass 401. The above steps are repeated until all the rock pieces 401 are printed. Referring to fig. 3, the rock mass 401 is an irregularly shaped mass. At the later stage of the printing process and after the printing process is finished, the raw material powder is sucked away and recovered by the powder recovery cylinder 12 through vacuum suction, and is recycled according to the condition. A barrier is present between the powder supply chamber 6 and the forming chamber 5 to allow a pressure differential between the two chambers.
5) Bonding the rock blocks 401 printed in the step 4) according to design by using mortar and cement paste to form a discontinuous body slope model with joint surfaces. Wherein the mortar and grout form joint face 402. The mortar, the cement paste and the rock mass 401 are adhered into a whole to form the three-dimensional slope model 4 together. The mortar forms a soft joint surface, and the cement can connect partial surfaces of the rock blocks to form a discontinuous joint surface. The strength of the mortar is not higher than 5 MPa.
6) Curing and forming: and (3) maintaining the three-dimensional slope model 4 at room temperature to enable the strength of the joint surface 402 to meet the expected requirement, and finally forming the discontinuous body slope indoor test model with the joint surface.
7) The three-dimensional slope model 4 is arranged on a small vibration table 15 or in an organic glass water tank 16, the instability process of the three-dimensional slope model 4 under the action of earthquake or water power is simulated, and a CCD continuous camera 14 is used for acquiring data.
The earthquake dynamic simulation test specifically comprises the following steps:
a) and fixing the three-dimensional slope model 4 on the vibrating table panel by using a clamp. A CCD continuous camera 14 for observing the whole model is arranged on the front view surface of the three-dimensional slope model 4. And starting the CCD continuous camera photographing software, and adjusting the position and the focal length of the CCD continuous camera 14 to enable the camera to obtain clear pictures of the slope model with proper size. The small-sized vibrating table 15 is a bidirectional vibrating small-sized vibrating table, and a vibration frequency spectrum is input from an external data line to control a vibration mode of the vibrating table.
b) The vibration spectrum set in advance is input to the small-sized vibration table 15, the vibration spectrum of the small-sized vibration table 15 is set, and the small-sized vibration table 15 is started. And starting the continuous shooting function of the CCD continuous camera 14, setting the interval of continuous shooting to be 0.2s, and starting shooting the deformation motion process of the slope model by the CCD continuous camera 14. The three-dimensional slope model 4 can collapse and slide along the weak joint surface under the vibration effect, and finally is completely destroyed. The CCD continuous camera records the process of the three-dimensional slope model 4 disintegration sliding damage at each moment and transmits the data back to the computer.
c) By using the image processing software, data such as the deformation of the slope, the displacement of the slide block, the speed of the slide block and the like between different moments can be obtained.
And (3) performing a hydraulic simulation test, namely arranging the three-dimensional slope model 4 in an organic glass water tank 16. The organic glass water tank 16 is a rectangular box body without a cover. The bottom of the organic glass water tank 16 is provided with a drain hole. A plastic hose connected with a water tap is erected at an opening at the upper end of the organic glass water tank 16, and a water discharge hole is communicated with a sewer through a plastic water pipe. Water is injected from an opening at the upper end of the organic glass water tank 16, and water is drained through a drain hole at the bottom, so that the water level lifting process is simulated. And selecting parameters such as the size, the slope angle, the joint angle and the like of the slope model to repeat the test according to different working conditions and test requirements, and recording test data.
Claims (7)
1. A method for constructing a discontinuous three-dimensional slope indoor model test by a 3D printing technology is characterized by comprising the following steps:
1) constructing a full three-dimensional slope digital model of a reduced scale by using a computer (13) according to a real rock slope physical model; obtaining a plurality of independent rock blocks formed by dividing a complete three-dimensional slope digital model by a design joint surface through computer aided design software; respectively exporting the independent rock blocks into STL model files;
2) preparing rock slope similar material powder; wherein the raw materials of the powder comprise sandstone powder, barite powder and gypsum powder;
3) building a 3D printing device; wherein the computer (13) is connected with the 3D printing device through a data line; the 3D printing device comprises a cementing agent supply cylinder (1), a printing spray head (3), a forming chamber (5), a powder conveying chamber (6), a powder conveying roller shaft (7), a moving system and a powder supply cylinder (11); the printing spray head (3) is arranged above the forming chamber (5); the printing spray head (3) is connected with the cementing agent supply cylinder (1) through a conveying pipe (2); the powder in the powder supply cylinder (11) is conveyed to the forming chamber (5) through the powder conveying chamber (6) and the powder conveying roller shaft (7); the printing nozzle (3) is positioned at a pre-printing position through a moving system;
4) printing a rock block (401); slicing and layering the plurality of STL model files in the step 1) through three-dimensional slicing software, and inputting the plurality of STL model files into a 3D printing device; the 3D printing device converts the three-dimensional model into three-dimensional coordinates, and the position of the printing nozzle (3) is adjusted according to the three-dimensional coordinates; when the powder in the forming chamber (5) is accumulated to the designed layer thickness, the mobile system positions the printing nozzle (3) to a pre-printing position point for cementing forming; after printing is finished, the mobile system is controlled to position the printing nozzle (3) to another pre-printing position; repeating the above steps to cement the powders together to form a rock mass (401); repeating the steps until all the rock blocks (401) are printed;
5) splicing the rock blocks (401) printed in the step 4) according to design by using mortar and cement paste to form a discontinuous body side slope model containing a joint surface; wherein, the mortar and the cement paste form a joint surface (402); the mortar, the cement paste and the rock mass (401) are adhered into a whole to jointly form a three-dimensional slope model (4);
6) maintaining the three-dimensional slope model (4) at room temperature to enable the strength of the joint surface (402) to meet the expected requirement;
7) arranging the three-dimensional slope model (4) on a small vibration table (15) or in an organic glass water tank (16), performing seismic or hydraulic simulation test, and acquiring data by using a CCD (charge coupled device) continuous camera (14); wherein the CCD continuous camera (14) is connected with the computer (13) through a data line.
2. The method for constructing the discontinuous three-dimensional slope indoor model test by the 3D printing technology according to the claim 1, characterized in that: the moving system comprises three direction axes of an X-direction moving axis (8), a Y-direction moving axis (9) and a Z-direction moving axis (10); the Z-direction moving shaft (10) is arranged on a bearing platform of the 3D printing device; the Z-direction moving shaft (10) is vertically arranged, and the X-direction moving shaft (8) and the Y-direction moving shaft (9) are horizontally arranged; the Z-direction moving shaft (10) is vertically connected with the X-direction moving shaft (8), and the X-direction moving shaft (8) is vertically connected with the Y-direction moving shaft (9); the printing spray head (3) is connected with a Y-direction moving shaft (9) through a sliding wheel; the Z-direction moving shaft (10) is connected with the X-direction moving shaft (8) through a sliding wheel; the X-direction moving shaft (8) is connected with the Y-direction moving shaft (9) through a sliding wheel.
3. The method for constructing the discontinuous three-dimensional slope indoor model test by the 3D printing technology according to the claim 1, characterized in that: in the step 1), the distribution form of the joint surface is designed according to the research requirement or is obtained in the actual engineering slope through a surface contour scanning technology.
4. The method for constructing the discontinuous three-dimensional slope indoor model test by the 3D printing technology according to the claim 1, characterized in that: the rock mass (401) is an irregularly shaped block.
5. The method for constructing the discontinuous three-dimensional slope indoor model test by the 3D printing technology according to the claim 1, characterized in that: the strength of the mortar is not higher than 5 MPa.
6. The method for constructing the discontinuous three-dimensional slope indoor model test by the 3D printing technology according to the claim 1, characterized in that: the earthquake dynamics simulation test in the step 7) specifically comprises the following steps:
a) fixing the three-dimensional slope model (4) on a vibrating table panel by using a clamp; arranging a CCD continuous camera (14) capable of observing the whole model on the front view surface of the three-dimensional slope model (4);
b) inputting a preset vibration frequency spectrum into the small vibration table (15), setting the vibration frequency spectrum of the small vibration table (15), and starting the small vibration table (15); starting a continuous shooting function of the CCD continuous camera (14), setting the interval of continuous shooting to be 0.2s, starting the deformation motion process of the slope model shooting by the CCD continuous camera (14), and transmitting data back to the computer;
c) by using the image processing software, the deformation of the slope, the displacement of the slide block and the speed data of the slide block between different moments can be obtained.
7. The method for constructing the discontinuous three-dimensional slope indoor model test by the 3D printing technology according to the claim 1, characterized in that: step 7), performing hydraulic simulation test, and arranging the three-dimensional slope model (4) in an organic glass water tank (16); the organic glass water tank (16) is integrally a rectangular box body without a cover; a drain hole is formed at the bottom of the organic glass water tank (16); water is injected from an opening at the upper end of the organic glass water tank (16), and water is drained through a drain hole at the bottom, so that the water level lifting process is simulated.
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| CN105675365A (en) * | 2016-01-18 | 2016-06-15 | 河海大学 | Method for preparing fractured rock mass samples with filler |
| CN105904573B (en) * | 2016-05-06 | 2018-02-06 | 河海大学 | A kind of transparent rock mass preparation method based on 3D printing technique |
| CN106127856B (en) * | 2016-06-27 | 2017-09-01 | 长安大学 | The method that the strata model of column containing crack is made based on CT scan and 3D printing |
| CN106447776A (en) * | 2016-09-22 | 2017-02-22 | 北京科技大学 | Complex fractured rock mass physical model manufactured based on 3D printing productionand modeling method |
| CN106769322A (en) * | 2017-01-11 | 2017-05-31 | 河海大学 | A kind of prismatical joint rock mass preparation method of sample of cylinder containing stomata |
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2018
- 2018-02-01 CN CN201810100252.XA patent/CN108252336B/en active Active
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