CN111929142A - Surrounding rock fracture prefabrication system under excavation disturbance and grouting test piece manufacturing method - Google Patents
Surrounding rock fracture prefabrication system under excavation disturbance and grouting test piece manufacturing method Download PDFInfo
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- CN111929142A CN111929142A CN202010941810.2A CN202010941810A CN111929142A CN 111929142 A CN111929142 A CN 111929142A CN 202010941810 A CN202010941810 A CN 202010941810A CN 111929142 A CN111929142 A CN 111929142A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
Abstract
The invention discloses a surrounding rock fracture prefabrication system under excavation disturbance and a grouting test piece manufacturing method in the technical field of surrounding rock fracture prefabrication systems, wherein the surrounding rock fracture prefabrication system comprises a system main body frame, a test piece prefabrication mold for preparing test piece molding, a fracture prefabrication material for reserving fracture holes in various shapes and a fracture positioning device for accurately positioning a three-dimensional space position of a fracture, wherein the fracture prefabrication material is positioned in the test piece prefabrication mold, and the fracture positioning device is positioned at the top end of the test piece prefabrication mold; the invention can design the shape of the fracture prefabricated material according to the situation of the surrounding rock fracture prototype, accurately fix the fracture prefabricated material in the test piece prefabricated mold by utilizing a fracture positioning device, pour the prefabricated mixed soil-bearing material, and solidify and form the concrete pile.
Description
Technical Field
The invention relates to the technical field of a surrounding rock fracture prefabrication system, in particular to a surrounding rock fracture prefabrication system under excavation disturbance and a grouting test piece manufacturing method.
Background
In recent years, with the rapid development of underground construction engineering, the instability change characteristics of the surrounding rock of the roadway and the supporting technology of the surrounding rock of the roadway are more and more concerned by the people in the industry. The inside of the roadway surrounding rock is distributed with joint cracks, and the stress distribution inside the surrounding rock changes under the influence of excavation disturbance, so that the microcracks are continuously expanded and developed. The cracks of partial stress concentration areas are continuously expanded to be communicated with each other to form macroscopic cracks, so that the instability of rock mass is caused, the excavation progress is seriously influenced, the production cost is increased, and the safety production of mines is threatened. In the existing method for improving the stability of the surrounding rock, the grouting reinforcement technology is widely applied by the characteristics of convenience in operation, strong adaptability and good supporting effect. In order to find out the mechanical property and breaking rule of the grouted rock-slurry stone composite material, a grouted rock sample is often adopted for indoor mechanical test, however, the field drilling method is influenced by the randomness of the structural surface distribution of the surrounding rock, the test result is often irregular, and therefore the morphological characteristics of the surrounding rock fracture under excavation disturbance need to be simulated to manufacture the grouting test piece for the test meeting the actual fracture conditions.
A plurality of scholars at home and abroad draw the surrounding rock fracture morphology under excavation disturbance by adopting methods such as field investigation, geophysical exploration, numerical simulation, inversion and the like, and provide reference for prefabrication of the surrounding rock fracture morphology.
The existing surrounding rock fracture prefabrication system and the grouting test piece manufacturing method have the following defects:
1. the existing surrounding rock fracture prefabrication system has randomness in prefabrication of fractures, the form size, the space position and the connectivity among the fractures of the fractures cannot be controlled, and the original form of the surrounding rock fractures cannot be restored;
2. the existing surrounding rock fracture prefabrication system is simple and inaccurate in determining the fracture position, or an arranged accurate positioning device is too complex, difficult to operate, targeted and not suitable for wide application;
3. the existing manufacturing method for preparing the grouting test piece by using the surrounding rock fracture prefabrication system has no requirement on the prefabricated fracture shape, the real shape characteristics of the surrounding rock fracture under excavation disturbance cannot be simulated, the obtained result has a large difference with the actual condition, and the field application condition cannot be accurately reflected.
Based on the above, the invention designs a surrounding rock fracture prefabrication system under excavation disturbance and a grouting test piece manufacturing method to solve the problems.
Disclosure of Invention
The invention aims to provide a surrounding rock fracture prefabrication system under excavation disturbance and a grouting test piece manufacturing method, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a surrounding rock fracture prefabrication system under excavation disturbance comprises a system main body frame, a test piece prefabrication mold for preparing a test piece to be molded, a fracture prefabrication material for reserving fracture holes in various shapes and a fracture positioning device for accurately positioning a three-dimensional space position of a fracture, wherein the fracture prefabrication material is positioned inside the test piece prefabrication mold, and the fracture positioning device is positioned at the top end of the test piece prefabrication mold;
the test piece prefabricating mold comprises a U-shaped bottom plate, a front side plate, a rear side plate and a front bolt and a rear bolt, wherein longitudinal U-shaped grooves are formed in the positions, close to the front end and the rear end, of the upper end face of the U-shaped bottom plate, the front side plate and the rear side plate are embedded into the corresponding longitudinal U-shaped grooves respectively, and the front bolt and the rear bolt are used for connecting the front side plate and the rear side plate with the front end and the rear end of the U-shaped bottom plate respectively through a;
the crack prefabricated material comprises a cylindrical metal block and a water-soluble crack material;
the crack positioning device comprises a transverse positioning sliding rod and a metal thread scale rod, a sliding block is fixedly mounted at the position, close to two ends, of the lower end face of the transverse positioning sliding rod, three rows of hollowed-out sliding grooves are formed in the upper end of the transverse positioning sliding rod, a plurality of sliding nuts are slidably connected to the upper ends of the hollowed-out sliding grooves, and the metal thread scale rod penetrates through the inner portions of the sliding nuts.
Preferably, the U-shaped bottom plate includes two risers, and the side direction horizontal location spout has all been seted up to the position that the upper end of two risers was close to each other, and the position that the position of keeping away from each other and the upper end of horizontal location slide bar are close to the position in the outside all is provided with horizontal scale, side direction horizontal location spout and slider sliding connection of riser.
Preferably, two longitudinal grooves are formed in the positions, close to the lower end, of the outer surfaces of the front end and the rear end of the U-shaped bottom plate, two vertical grooves are formed in the outer side face, opposite to the rear side plate, of the front side plate, the width of each vertical groove and the width of each longitudinal groove are larger than that of each bolt, the vertical grooves and the longitudinal grooves are located on the same vertical line, each bolt is embedded into the corresponding longitudinal groove and the corresponding vertical groove, and a cylindrical hole is formed in the area between the two vertical grooves in the front side plate.
Preferably, the diameter of the cylindrical metal block is smaller than the diameter of the cylindrical hole.
Preferably, the water-soluble fissure material is formed by splicing cut water-soluble paper boards, the shape and size of the water-soluble paper boards can be cut at will, and the surface roughness of the water-soluble fissure material can be changed by friction or carving.
Preferably, the two sides of the sliding nut are provided with ear holes, the sliding nut with the ear holes corresponds to the three rows of hollowed-out sliding grooves, fixing screws penetrate through the inside of the ear holes, and the sliding nut is positioned on the transverse positioning sliding rod through the fixing screws.
Preferably, metal screw thread scale rod includes screw thread scale rod, universal magnetic ball and metal pole from top to bottom, and semi-circular magnetic force recess has all been seted up to the lower extreme of screw thread scale rod and the upper end of metal pole, and semi-circular magnetic force recess is inhaled admittedly with universal magnetic ball rounding off.
A manufacturing method for preparing a grouting test piece by a surrounding rock fracture prefabrication system under excavation disturbance comprises the following steps:
step 1: embedding the front side plate and the rear side plate into U-shaped grooves on the front side and the rear side of the U-shaped bottom plate, embedding four bolts into the grooves, fixing the bolts with the front side plate, the rear side plate and the U-shaped bottom plate by using rivets, and coating lubricating oil on the inner wall of the assembled test piece prefabricated mold;
step 2: manufacturing a water-soluble fracture material, selecting soluble paper with proper thickness, cutting, splicing to form a required surrounding rock fracture grid form, and then coating a layer of paraffin film on the surface of the manufactured water-soluble fracture material;
and step 3: selecting 1-3 transverse positioning slide bars according to the number and position conditions of the required cracks, and installing slide nuts in the hollowed-out slide grooves;
and 4, step 4: connecting the metal thread scale rod to the assembled transverse positioning slide rod through a sliding nut, and fixing the prepared water-soluble crack material at the bottom end of the metal thread scale rod;
and 5: the slide block and the lateral horizontal positioning chute are embedded in an aligned mode, and the position of the transverse positioning slide rod is adjusted according to a horizontal dividing rule on the lateral horizontal positioning chute;
step 6: adjusting and fixing the position of a sliding nut according to a horizontal dividing ruler on a transverse positioning sliding rod, adjusting the height of a metal threaded dividing rod according to the required crack depth, and rotating a universal magnetic ball according to the required crack space form to enable the threaded dividing rod and the metal rod to form a proper angle;
and 7: coating lubricating oil on the cylindrical metal block, and then inserting and fixing the cylindrical metal block through the cylindrical hole;
and 8: pouring a rock-like concrete material which is prefabricated in advance along the inner wall of the test piece prefabricating mold until the rock-like concrete material is completely immersed in the water-soluble crack material, separating the water-soluble crack material from the metal thread graduated rod when the water-soluble crack material is semi-solidified, removing the crack positioning device, and continuously pouring the rock-like concrete material until the pouring is finished;
and step 9: after the test piece is completely solidified, drawing out the cylindrical metal block, slowly injecting warm water into the test piece along the reserved cylindrical hole, fully soaking the test piece, melting the paraffin thin layer coated on the outer side of the water-soluble fracture material, dissolving the water-soluble fracture material, and completing fracture prefabrication;
step 10: demolish prefabricated mould of test piece, take out the test block maintenance back, arrange in ventilation, shade, dry department dry in can, when carrying out the slip casting test, insert the slip casting pipe in the cylindrical hole that the test piece was reserved, pour into prefabricated thick liquid into, wait that thick liquid and test piece condense into an organic whole after, can take a sample and be used for the slip casting test.
Compared with the prior art, the invention has the beneficial effects that:
1. the three-dimensional space position and the shape of the crack can be accurately positioned, the surface roughness and the connectivity of the crack can be adjusted, and the prepared crack-containing test piece meets the crack conditions under various geological conditions;
2. the two-series positioning system device is simple and high in accuracy, and can accurately position the three-dimensional space form of the required crack in the test piece;
3. the manufacturing method for preparing the grouting test piece by using the surrounding rock fracture prefabrication system provided by the invention can simulate the real morphological characteristics of the surrounding rock fracture under excavation disturbance, the obtained result is close to the actual situation, and the field grouting effect can be accurately reflected.
4. The invention can design the shape of the fracture prefabricated material according to the surrounding rock fracture prototype condition, accurately fix the fracture prefabricated material in the test piece prefabricated mould by utilizing the fracture positioning device, pour the prefabricated mixed soil-covering material, and solidify and form the fracture prefabricated material.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the right side cross-sectional structure of the present invention;
FIG. 3 is an exploded view of a test piece preform mold of the present invention;
FIG. 4 is a schematic view of the fracture positioning device of the present invention;
fig. 5 is a schematic structural view of the metal thread scale rod of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a rear side plate; 2. a metal thread scale rod; 3. the sliding rod is transversely positioned; 4. a metal rod; 5. a water-soluble fissured material; 6. a horizontal graduated scale is arranged at the side end of the U-shaped bottom plate; 7. a vertical plate; 8. a threaded scale bar; 9. a front side plate; 10. a bolt; 11. a cylindrical metal block; 12. riveting; 13. a U-shaped bottom plate; 14. a lateral horizontal positioning chute; 15. a slider; 16. hollowing out the sliding groove; 17. a sliding nut; 18. a set screw; 19. a universal magnetic ball; 20. dispensing; 22. a circular hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, the invention provides a surrounding rock fracture prefabrication system under excavation disturbance and a grouting test piece manufacturing method, which comprises the following steps: a surrounding rock fracture prefabrication system under excavation disturbance comprises a system main body frame, a test piece prefabrication mold for preparing a test piece to be molded, a fracture prefabrication material for reserving fracture holes in various shapes and a fracture positioning device for accurately positioning a three-dimensional space position of a fracture, wherein the fracture prefabrication material is positioned inside the test piece prefabrication mold, and the fracture positioning device is positioned at the top end of the test piece prefabrication mold;
the test piece prefabricating mold comprises a U-shaped bottom plate 13, a front side plate 9, a rear side plate 1 and a front bolt and a rear bolt 10 which are made of metal plates, longitudinal U-shaped grooves are formed in the positions, close to the front end and the rear end, of the upper end face of the U-shaped bottom plate 13, the front side plate 9 and the rear side plate 1 are embedded into the corresponding longitudinal U-shaped grooves respectively, and the front bolt 10 and the rear bolt 10 are used for connecting the front side plate 9 and the rear side plate 1 with the front end and the rear end of the U-shaped bottom plate 13 through a plurality;
the crack prefabricating material comprises a cylindrical metal block 11 and a water-soluble crack material 5, wherein the cylindrical metal block 11 is used for prefabricating a cylindrical crack, and the water-soluble crack material 5 is formed by cutting water-soluble paper and splicing and is used for simulating crack grids in different forms;
crack positioner includes transverse positioning slide bar 3 and metal thread scale bar 2, the equal fixed mounting in position that the lower terminal surface of transverse positioning slide bar 3 is close to both ends has slider 15, three rows of fretwork sliding tray 16 have been seted up to transverse positioning slide bar 3's upper end, the upper end slidable connection of fretwork sliding tray 16 has a plurality of slip nut 17, metal thread scale bar 2 runs through the inside at slip nut 17, metal thread scale bar 2 establishes the relation through slip nut 17 with transverse positioning slide bar 3, realize the high accuracy three-dimensional space location in many cracks.
The U-shaped bottom plate 13 comprises two vertical plates 7, lateral horizontal positioning chutes 14 are formed in positions, close to each other, of the upper ends of the two vertical plates 7, horizontal dividing scales 6 are arranged in positions, far away from each other, of the upper ends of the vertical plates 7 and positions, close to the outer sides, of the upper ends of the transverse positioning slide bars 3, and the lateral horizontal positioning chutes 14 are connected with the slide blocks 15 in a sliding mode.
Two vertical grooves are formed in the positions, close to the lower end, of the outer surfaces of the front end and the rear end of the U-shaped bottom plate 13, the two vertical grooves are formed in the outer side face, opposite to the rear side plate 1, of the front side plate 9, the width of each vertical groove is larger than that of each plug pin 10, the vertical grooves and the vertical grooves are located on the same vertical line, the plug pins 10 are embedded into the vertical grooves and the vertical grooves, and a cylindrical hole 22 is formed in the area between the two vertical grooves in the front side plate 9.
The diameter of the cylindrical metal block 11 meets the size requirement of the grouting hole, and the diameter of the cylindrical metal block 11 is smaller than that of the cylindrical hole 22, so that the cylindrical metal block 11 can be inserted into and withdrawn from the cylindrical hole 22 conveniently.
The soluble paperboard can be cut into different sizes, and the surface roughness of the soluble paperboard can be changed by friction or carving, so that the soluble paperboard can be used for restoring the real fracture form in the surrounding rock.
The earhole has all been seted up to slip nut 17 both sides, and the slip nut 17 that has the earhole is corresponding with three rows of fretwork sliding tray 16, and the inside of earhole runs through there is set screw 18, and set screw 18 is last to be provided with the fixation nut of looks adaptation, through set screw 18 with slip nut 17 location in horizontal location slide bar 3 on, and the visual experiment demand increase and decrease of slip nut 17 quantity.
Metal screw thread scale rod 2 includes screw thread scale rod 8, universal magnetic ball 19 and metal pole 4 from top to bottom, and semi-circular magnetic groove has all been seted up to the lower extreme of screw thread scale rod 8 and the upper end of metal pole 4, and semi-circular magnetic groove and the solid is inhaled with the 19 slick and sly of universal magnetic ball, but through universal magnetic ball 19 random variation angle between screw thread scale rod 8 and metal pole 4.
A manufacturing method for preparing a grouting test piece by a surrounding rock fracture prefabrication system under excavation disturbance comprises the following steps:
step 1: embedding a front side plate 9 and a rear side plate 1 into U-shaped grooves on the front side and the rear side of a U-shaped bottom plate 13, embedding four bolts 10 into the grooves, fixing the bolts 10 with the front side plate 9, the rear side plate 1 and the U-shaped bottom plate 13 by rivets 12, and coating lubricating oil on the inner wall of an assembled test piece prefabricated mold;
step 2: manufacturing a water-soluble fracture material 5, selecting soluble paper with proper thickness, cutting, splicing to form a required surrounding rock fracture grid form, and then coating a layer of paraffin film on the surface of the manufactured water-soluble fracture material 5;
and step 3: according to the number and position of the needed cracks, 1-3 transverse positioning slide bars 3 are selected, and a proper number of sliding nuts 17 are arranged in hollow sliding grooves 16 on the transverse positioning slide bars 3 through the matching action of fixing screws 18 and ear holes;
and 4, step 4: the metal thread graduated rod 2 is connected to the assembled transverse positioning slide rod 3 through a slide nut 17, and then the prepared water-soluble crack material 5 is fixed at the bottom end of the metal thread graduated rod 2 through glue dispensing 20;
and 5: aligning and embedding the sliding block 15 on the transverse positioning sliding rod 3 in the steps with the lateral horizontal positioning sliding groove 14 on the U-shaped bottom plate 13, adjusting the position of the transverse positioning sliding rod 3 according to the horizontal dividing rule 6 on the lateral horizontal positioning sliding groove 14, and fixing;
step 6: the position of a sliding nut 17 is adjusted and fixed according to a horizontal dividing ruler 6 on a transverse positioning sliding rod 3, the height of a metal thread dividing rod 2 is adjusted according to the required crack depth, and a universal magnetic ball 19 is rotated according to the required crack space form, so that a thread dividing rod 8 and a metal rod 4 form a proper angle;
and 7: after the cylindrical metal block 11 is coated with lubricating oil, the cylindrical hole 22 is inserted and fixed;
and 8: pouring rock-like concrete materials which are prefabricated in advance along the inner wall of the test piece prefabricating mold until the water-soluble crack materials 5 are completely immersed, cutting off the glue 20 for connecting the water-soluble crack materials 5 and the metal thread graduated rod 2 when the water-soluble crack materials are semi-solidified, removing the crack positioning device, continuously pouring the rock-like concrete materials until the pouring is completed, and performing the pouring process on a concrete stirring table to fully vibrate so that the materials are completely contacted;
and step 9: after the test piece is completely solidified, drawing out the cylindrical metal block 11, slowly injecting warm water into the test piece along the reserved cylindrical hole 22, fully soaking the test piece, melting the paraffin thin layer coated on the outer side of the water-soluble fracture material 5, dissolving the water-soluble fracture material 5, and completing fracture prefabrication;
step 10: demolish the prefabricated mould of test piece, take out the test block maintenance back, arrange in ventilation, shade, dry department dry in can, when carrying out the slip casting test, insert the slip casting pipe in the cylindrical hole 22 that the test piece was reserved, pour into prefabricated thick liquid into, wait that thick liquid and test piece condense into an organic whole after, can take a sample and be used for the slip casting test.
The method for manufacturing the grouting test piece by using the surrounding rock fracture prefabrication system can simulate the real morphological characteristics of the surrounding rock fracture under excavation disturbance, the obtained result is close to the actual condition, and the field grouting effect can be accurately reflected.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A surrounding rock fracture prefabrication system under excavation disturbance is characterized by comprising a system main body frame, a test piece prefabrication mold for preparing a test piece to be molded, a fracture prefabrication material for reserving fracture holes in various shapes and a fracture positioning device for accurately positioning a three-dimensional space position of a fracture, wherein the fracture prefabrication material is positioned inside the test piece prefabrication mold, and the fracture positioning device is positioned at the top end of the test piece prefabrication mold;
the test piece prefabricating mold comprises a U-shaped bottom plate (13), a front side plate (9), a rear side plate (1) and a front bolt and a rear bolt (10), wherein longitudinal U-shaped grooves are formed in positions, close to the front end and the rear end, of the upper end face of the U-shaped bottom plate (13), the front side plate (9) and the rear side plate (1) are respectively embedded into the corresponding longitudinal U-shaped grooves, and the front bolt and the rear bolt (10) are respectively used for connecting the front side plate (9) and the rear side plate (1) with the front end and the rear end of the U-shaped bottom plate (13) through a plurality of rivets (12);
the crack prefabricated material comprises a cylindrical metal block (11) and a water-soluble crack material (5);
the crack positioning device comprises a transverse positioning slide rod (3) and a metal thread scale rod (2), wherein a slide block (15) is fixedly mounted at a position, close to two ends, of the lower end face of the transverse positioning slide rod (3), three rows of hollowed-out slide grooves (16) are formed in the upper end of the transverse positioning slide rod (3), a plurality of sliding nuts (17) are slidably connected to the upper ends of the hollowed-out slide grooves (16), and the metal thread scale rod 2 penetrates through the inside of the sliding nuts (17).
2. The surrounding rock fracture prefabrication system under excavation disturbance of claim 1, characterized in that: u-shaped bottom plate (13) include two riser (7), two lateral direction horizontal location spout (14) have all been seted up to the position that the upper end of riser (7) is close to each other, the position that the upper end of riser (7) was kept away from each other and the position that the upper end of horizontal location slide bar (3) is close to the outside all is provided with horizontal scale (6), lateral direction horizontal location spout (14) and slider (15) sliding connection.
3. The surrounding rock fracture prefabrication system under excavation disturbance of claim 1, characterized in that: two vertical grooves are formed in the positions, close to the lower end, of the outer surfaces of the front end and the rear end of the U-shaped bottom plate (13), two vertical grooves are formed in the outer side face, opposite to the rear side plate (1), of the front side plate (9), the width of each vertical groove and the width of each vertical groove are larger than the width of each bolt (10), the vertical grooves and the vertical grooves are located on the same vertical line, each bolt (10) is embedded into the corresponding vertical groove, and a cylindrical hole (22) is formed in the area between the two vertical grooves in the front side plate (9).
4. The surrounding rock fracture prefabrication system under excavation disturbance of claim 1, characterized in that: the diameter of the cylindrical metal block (11) is smaller than that of the cylindrical hole (22).
5. The surrounding rock fracture prefabrication system under excavation disturbance of claim 1, characterized in that: the water-soluble crack material (5) is formed by cutting and splicing water-soluble paper boards.
6. The surrounding rock fracture prefabrication system under excavation disturbance of claim 1, characterized in that: the sliding nut (17) is characterized in that ear holes are formed in two sides of the sliding nut (17), the sliding nut (17) with the ear holes corresponds to the three rows of hollowed-out sliding grooves (16), fixing screws (18) penetrate through the inside of the ear holes, and the sliding nut (17) is positioned on the transverse positioning sliding rod (3) through the fixing screws (18).
7. The surrounding rock fracture prefabrication system under excavation disturbance of claim 1, characterized in that: metal screw thread scale rod (2) include screw thread scale rod (8), universal magnetic ball (19) and metal pole (4) from top to bottom, semi-circular magnetic force recess has all been seted up to the lower extreme of screw thread scale rod (8) and the upper end of metal pole (4), and semi-circular magnetic force recess is inhaled admittedly with universal magnetic ball (19) rounding off.
8. The manufacturing method for preparing the grouting test piece by the surrounding rock fracture prefabrication system under excavation disturbance according to any one of claims 1 to 7, characterized by comprising the following steps of:
step 1: embedding a front side plate (9) and a rear side plate (1) into U-shaped grooves on the front side and the rear side of a U-shaped bottom plate (13), embedding four bolts (10) into the grooves, fixing the bolts (10) with the front side plate (9), the rear side plate (1) and the U-shaped bottom plate (13) by using rivets (12), and coating lubricating oil on the inner wall of an assembled test piece prefabricated mold;
step 2: manufacturing a water-soluble fracture material (5), selecting soluble paper with proper thickness, cutting, splicing to form a required surrounding rock fracture grid form, and then coating a layer of paraffin film on the surface of the manufactured water-soluble fracture material (5);
and step 3: according to the number and position of the needed cracks, 1-3 transverse positioning sliding rods (3) are selected, and sliding nuts (17) are arranged in hollow sliding grooves (16);
and 4, step 4: connecting the metal thread scale rod (2) to the assembled transverse positioning slide rod (3) through a sliding nut (17), and fixing the prepared water-soluble crack material (5) at the bottom end of the metal thread scale rod (2);
and 5: the slide block (15) is embedded in the lateral horizontal positioning chute (14) in an aligning way, and the position of the transverse positioning slide rod (3) is adjusted according to the horizontal dividing rule (6) on the lateral horizontal positioning chute (14);
step 6: according to a horizontal dividing rule (6) on the transverse positioning slide rod (3), the position of a sliding nut (17) is adjusted and fixed, the height of the metal threaded dividing rod (2) is adjusted according to the required crack depth, and then the universal magnetic ball (19) is rotated according to the required crack space form, so that the threaded dividing rod (8) and the metal rod (4) form a proper angle;
and 7: coating lubricating oil on the cylindrical metal block (11), and then inserting and fixing the cylindrical metal block through the cylindrical hole (22);
and 8: pouring a rock-like concrete material which is prefabricated in advance along the inner wall of the test piece prefabricating mold until the water-soluble fracture material (5) is completely immersed, separating the water-soluble fracture material (5) from the metal thread graduated rod (2) when the water-soluble fracture material is semi-solidified, removing the fracture positioning device, and continuously pouring the rock-like concrete material until the pouring is finished;
and step 9: after the test piece is completely solidified, drawing out the cylindrical metal block (11), slowly injecting warm water into the test piece along the reserved cylindrical hole (22), fully soaking the test piece, melting the paraffin thin layer coated on the outer side of the water-soluble fracture material (5), dissolving the water-soluble fracture material (5), and completing fracture prefabrication;
step 10: demolish the prefabricated mould of test piece, take out the test block maintenance back, arrange in ventilation, shade, dry department and dry can, when carrying out the slip casting test, insert the slip casting pipe in cylindrical hole (22) that the test piece was reserved, pour into prefabricated thick liquid into, wait that thick liquid and test piece condense integrative after, can take a sample and be used for the slip casting test.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203617A (en) * | 2021-06-23 | 2021-08-03 | 重庆大学 | Fractured rock mass test piece sample preparation mold and sample preparation method thereof |
| CN114323845A (en) * | 2021-12-16 | 2022-04-12 | 山西潞安环保能源开发股份有限公司常村煤矿 | Manufacturing tool and method for jointed rock mass |
| CN115683788A (en) * | 2022-12-30 | 2023-02-03 | 北京科技大学 | Auxiliary pouring tool capable of accurately generating cracks and use method |
-
2020
- 2020-09-09 CN CN202010941810.2A patent/CN111929142A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203617A (en) * | 2021-06-23 | 2021-08-03 | 重庆大学 | Fractured rock mass test piece sample preparation mold and sample preparation method thereof |
| CN114323845A (en) * | 2021-12-16 | 2022-04-12 | 山西潞安环保能源开发股份有限公司常村煤矿 | Manufacturing tool and method for jointed rock mass |
| CN115683788A (en) * | 2022-12-30 | 2023-02-03 | 北京科技大学 | Auxiliary pouring tool capable of accurately generating cracks and use method |
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