CN113049448A - Organic grouting material diffusion test device and method based on transparent rock mass - Google Patents

Organic grouting material diffusion test device and method based on transparent rock mass Download PDF

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Publication number
CN113049448A
CN113049448A CN202110241622.3A CN202110241622A CN113049448A CN 113049448 A CN113049448 A CN 113049448A CN 202110241622 A CN202110241622 A CN 202110241622A CN 113049448 A CN113049448 A CN 113049448A
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rock mass
transparent rock
grouting
plate
transparent
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郝晨良
吴昌泉
王朋飞
刘镇书
陈可夯
张建利
张新华
张海龙
王天平
高梦男
刘佳男
祝壮
樊一江
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Taiyuan University of Technology
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Taiyuan University of Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/36Embedding or analogous mounting of samples
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/38Diluting, dispersing or mixing samples
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N2013/003Diffusion; diffusivity between liquids

Abstract

The invention discloses a device and a method for organic grouting material diffusion test based on a transparent rock mass. The test device comprises a transparent rock mass material processing device, a loading device, a monitoring device, a drilling device and a grouting device; the loading device is a multi-field coupling microcomputer electrohydraulic servo rock mass triaxial press; the monitoring device comprises an acoustic emission detection device, a low resistance tester, a high-speed camera, a polyethylene insulation board, a conductive copper sheet, an acoustic emission probe, a wire, a data processor and a computer; a drilling device; a grouting device. The method is used for researching the diffusion mode of the organic grouting material in the rock mass, and by manufacturing the transparent rock mass with the same property as the original rock mass and utilizing the intuitiveness of the performance, the problem that the interior of the original rock material cannot be observed is solved, and the research on the diffusion mechanism of the interior of the organic grout surrounding rock is realized.

Description

Organic grouting material diffusion test device and method based on transparent rock mass
Technical Field
The invention relates to a transparent rock mass-based organic grouting material diffusion test device and method, and belongs to the technical field of grouting simulation test equipment.
Background
At present, the engineering activities such as underground mineral resource exploitation, tunnel construction and the like all need to dig a tunnel, and the grouting material is widely applied to the engineering of reinforcing the working face and the tunnel under the mine, plugging water burst on the top plate of the tunnel and the like. Various new materials, new processes and new equipment for grouting reinforcement emerge endlessly, and the development of grouting reinforcement technology is greatly promoted. In recent years, the chemical plugging agent is widely applied to the fields of oilfield production, mine plugging, reinforcement and the like. The organic grouting material has the advantages of small particles, light color after curing, no pollution to an adhered object, good process performance, lower cost, simple and convenient preparation, excellent bonding performance and the like, and has an irreplaceable position in mineral engineering materials. Therefore, the grouting theory and the related technology still have great research value.
However, the research on the diffusion mode of the organic grouting material is not thorough at present, and mainly adopts theoretical analysis, laboratory simulation experiment and numerical simulation. As the diffusion mode of the grouting material is in the rock mass, most rocks are opaque shelters, so that the conventional experimental method is difficult to test the diffusion mode of the grouting material in the rock mass, and the development of the grouting reinforcement technology is limited to a certain extent.
Disclosure of Invention
The invention aims to provide a device and a method for organic grouting material diffusion test based on a transparent rock mass.
The test device and the method utilize the transparent characteristic of the material, observe the diffusion mode of the grouting material in the rock mass through the transparent rock mass, and overcome the problem of black box which can not be observed in the rock mass; the problem of distortion of monitoring equipment in the information conversion process through acoustic emission or CT scanning and the like is solved, and the research on the internal diffusion mechanism of the organic slurry surrounding rock is realized.
The invention provides an organic grouting material diffusion test device based on a transparent rock mass, which comprises a transparent rock mass material processing device, a loading device, a monitoring device, a drilling device, a grouting device and a fixed connecting device, wherein the loading device is arranged on the transparent rock mass material processing device;
the transparent rock mass material processing device comprises a frame-shaped test bed wall and a press machine, wherein the press machine is fixed on a horizontal steel plate on the bottom surface through a support; the press machine is a two-column press machine; the bottom surface of the test bed is a horizontal steel bottom plate, a fixed steel plate with a square cross section is arranged in the center of the bottom plate, the middle part of the fixed steel plate is of a hollow structure, and the cross section of the hollow structure is a square cross section and is used for fixing a frame-shaped test bed wall; the frame-shaped test bed wall comprises a left side plate wall, a right side plate wall, a front side plate wall and a rear side plate wall, the left side plate wall and the right side plate wall are fixed through positive and negative locking, and a space with a square section is formed by the four plate walls in a surrounding mode; the fixed steel plate is fixed on a horizontal bottom plate at the bottom through 4 turnbuckles; the four plate walls are divided into a group of two, wherein one group is provided with a positive lock catch, the other group is provided with a negative lock catch, and the four plate walls are locked by the positive and negative locks;
the loading device is a multi-field coupling microcomputer electrohydraulic servo rock mass triaxial press;
the monitoring device comprises an acoustic emission detection device, a low resistance tester, a high-speed camera, a polyethylene insulation board, a conductive copper sheet, an acoustic emission probe, a wire, a data processor and a computer; the transparent rock mass model is positioned between an upper pressing plate and a lower pressing plate of a triaxial press of the loading device, a polyethylene insulation plate is arranged above the lower pressing plate of the press, conductive copper sheets are adhered to the upper end surface and the lower end surface of the transparent rock mass model, the transparent rock mass model is placed on the polyethylene insulation plate, and the same polyethylene insulation plate is arranged above the transparent rock mass model; the low-resistance tester and the high-speed camera are placed in front of the press, the conductive copper sheet is connected with the low-resistance tester, the acoustic emission probe is connected with the quadrangular transparent rock mass model by AB glue, and the other end of the acoustic emission probe is connected with the acoustic emission detection device and then connected with the data processor and the computer;
the drilling device is a T-shaped thin steel pipe;
the slip casting device adopts organic thick liquid slip casting device, and the slip casting device includes: a stirrer, a valve, a metering pump and a slurry conveying pipe; a cover is arranged above the stirrer, and the materials can be put in the stirrer after the cover is opened; the stirrer is connected with the metering pump through a pipeline, and a valve is arranged between the stirrer and the metering pump; the metering pump is connected with the slurry conveying pipe; the other end of the slurry conveying pipe is connected with a slurry injection pipe;
the fixed connecting device comprises a transparent rock mass model fixing device, a drilling pipe and a grouting pipe fixing device; the fixed connecting device comprises a test bed, wherein 4 pieces of angle steel are vertically placed on the test bed, the transparent rock mass model is placed in a space formed by the angle steel, the bottom of each angle steel comprises 4 screw holes, and the angle steel is connected with the test bed through screws; two narrow steel plates are arranged on the right side of the angle steel on the longitudinal horizontal central line of the test bed, a circular hole is formed above each steel plate, a screw hole is formed below each steel plate, and the steel plates are connected with the test bed through screws; a high-speed camera is placed right in front of the test bed in the longitudinal horizontal direction and right opposite to the transparent rock mass model;
in the device, the middle of the bottom plate of the transparent rock mass material processing device is provided with the square boss, the cross section area of the square boss is square, the thickness of the boss is consistent with that of the fixed steel plate, and a gap with the thickness consistent with that of the plate wall is formed between the edge of the boss and the inner section of the fixed steel plate and used for fixing the plate wall of the test bed, so that the four plate walls can be tightly nested into the gap between the lug of the bottom plate and the fixed steel plate.
In the device, the bottom of the test bed support column is provided with the balance screw, the bottom of the test bed support column is provided with the universal wheel, and the universal wheel is set to be a lockable universal wheel.
In the above device, the grouting slurry is an organic slurry, and includes polyurethanes, phenolic resins, unsaturated polyester resins, epoxy ethyl esters, and the like.
In the device, the grouting pump selected by the organic grouting material device is a metering pump capable of accurately metering grout.
In the device, the drilling pipe and the grouting pipe are fixed through circular holes on two narrow steel plates on the wooden desktop; the positions of the table plates connected with the screw holes are provided with grooves, and the grooves at the positions of the screw holes and the table plates are leveled by epoxy ethyl ester materials.
The invention provides a method for organic grouting material diffusion test of a transparent rock mass, which adopts the device and comprises the following steps:
(1) preparing required materials, including materials required by transparent rock mass and materials required by grouting slurry;
(2) preparing a transparent rock mass material, calculating a similar simulation material according to a similarity ratio according to strength parameters and a similar theory obtained by a rock mechanics test, and proportioning the transparent rock mass material which meets the strength converted by the similarity ratio by adopting liquid paraffin, a tridecane solution and silicon powder; carrying out a grouting experiment according to needed grouting parameters, and proportioning grouting materials meeting the grouting parameters by adopting proper organic grouting materials;
(3) pouring and molding a test piece, namely placing the transparent rock mass material which is proportioned and uniformly stirred in the step (2) into a viscous state to a colloidal state, namely when the deformation property of the material is similar to plasticine, the material has stronger plasticity, at the moment, pouring the material into a frame-shaped test bed wall of a transparent rock mass material processing device, modulating the pressure of a press machine to the pressure calculated in the step (2), maintaining the transparent rock mass model at constant pressure, after 24 hours, completely solidifying slurry, and having mechanical strength according with the strength similarity ratio, removing plate walls around the test bed, taking down the poured and molded transparent rock mass, placing the transparent rock mass in a ventilation position, periodically maintaining, and naturally air-drying; after air drying, grinding the upper end surface and the lower end surface of the test piece by using a stone grinder, wherein the non-parallelism of the two end surfaces of the test piece is required to be not more than 0.01mm, the upper end surface and the lower end surface of the test piece are perpendicular to the four side surfaces, the maximum deviation is not more than 0.25 degrees, the four side surfaces of the test piece are smooth and flat, and every two adjacent side surfaces are perpendicular to each other; 1 cube transparent rock mass model 1 is manufactured according to the steps and is compiled into a control group 1;
(4) pre-fracturing a test piece, namely placing the transparent rock mass model prepared in the step (3) between an upper pressing plate and a lower pressing plate of a press machine by using a multi-field coupling micro electro-hydraulic servo rock triaxial press machine, stacking a polyethylene insulating plate above the lower pressing plate of the press machine, sticking conductive copper sheets on the upper end surface and the lower end surface of the transparent rock mass model, placing the transparent rock mass model on the polyethylene insulating plate, and arranging the same polyethylene insulating plate above the transparent rock mass model at the contact part with the upper pressing plate; the monitoring device is placed in front of the transparent rock mass model, the conductive copper sheet is connected with the low-resistance tester, the acoustic emission probe is connected with the transparent rock mass model by AB glue, and the other end of the acoustic emission probe is connected with the acoustic emission detection device and then connected with the data processor and the computer;
performing uniaxial compression on the transparent rock mass model obtained in the step (3) until the transparent rock mass model is fractured; analyzing the distribution and expansion conditions of cracks in the test piece in the compression process by using a high-speed camera to obtain the pressure required by manufacturing the prefabricated crack test piece;
(5) manufacturing a prefabricated crack test piece: according to the test piece pouring forming process in the step (3) and the pressure required by the corresponding crack obtained in the step (4), pre-fracturing is carried out on the transparent rock body model by using a multi-field coupling micro electro-hydraulic servo rock triaxial press machine to obtain a corresponding prefabricated crack test piece;
(6) preparing a grouting device, namely placing the transparent rock mass model on a fixing device, drilling a needed hole through a drilling hollow pipe, then adopting a double-liquid grouting device, calculating the proportion of the grouting materials obtained in the step (2), selecting the optimal proportion, adding the grouting device, and performing a grouting experiment;
(7) monitoring: injecting the organic slurry prepared in the step (6) into a prefabricated crack test piece under the action of the pressure of a grouting device, and simultaneously opening a high-speed camera and recording test data;
by adopting different fracturing modes, prefabricated fracture test pieces containing fractures in different directions and different angles are obtained, and the diffusion mode and the diffusion radius of the organic slurry under different fractures of the transparent rock are explored;
by changing the grouting pressure of a grouting pump, the diffusion mode and the diffusion radius of the organic grout in the transparent rock body under different grouting pressures are researched.
In the method, the transparent rock mass material is prepared from the following raw materials in parts by mass: liquid paraffin: n-tridecane solution: silicon powder =1: (0.63-0.82): (1.1-1.3).
In the method, the transparent rock mass material is prepared from the following raw materials in parts by mass: liquid paraffin: n-tridecane solution: the silicon powder =1:0.815:1.15, and the transparent rock mass material has the best performance and the best transparency.
In the method, in the steps (4) and (5), the transparent rock mass model is subjected to one-dimensional loading in a loading mode of the transparent rock mass cracks, so that unidirectional cracks can be obtained; carrying out two-dimensional loading, and manufacturing an oblique crack by different pressures of two vertical surfaces of the two-dimensional loading; and (3) carrying out true triaxial loading to prefabricate the cracks in different directions and different angles, and selecting different pressure modes according to different requirements to obtain corresponding prefabricated crack test pieces.
The test device and the method break through the bottleneck that the diffusion condition of the grout inside the conventional surrounding rock can not be observed during grouting, utilize the transparent characteristic of the material, observe the diffusion mode of the grouting material in the rock body through the transparent rock body, and overcome the problem that the inside of the rock body can not be observed into a black box; the problem of distortion of monitoring equipment in the information conversion process through acoustic emission or CT scanning and the like is solved, the research on the internal diffusion mechanism of the organic slurry surrounding rock is realized, and the method has important significance on the diffusion mode of grouting slurry in the surrounding rock cracks.
Drawings
FIG. 1 shows a transparent rock material processing device;
FIG. 2 is a schematic view of the locking of 4 plates of the transparent rock mass material processing device;
FIG. 3 is a schematic view of the bottom structure of the transparent rock mass material processing device;
FIG. 4 is a schematic view of the fracture loading of a transparent rock mass;
FIG. 5 shows a device for fixing transparent rock mass material and monitoring grouting slurry diffusion;
FIG. 6 is a three-view diagram showing the connection relationship between the L-shaped iron post and the desktop;
FIG. 7 is a three-dimensional view of the connection between the narrow steel plate and the table top;
FIG. 8 is a schematic view of a transparent rock body drilled hole;
FIG. 9 is a schematic diagram of transparent rock mass grouting;
FIG. 10 is a schematic view of a grouting slurry diffusion mode;
FIG. 1-two column press; 2-a console; 3-left and right side walls; 4-front and back side panel walls; 5-square boss; 6-a screw; 7-a bottom plate; 8-balance screw; 9-fixed steel plate, 10-pillar; 11-an upper platen; 12-polyethylene insulation panels; 13-a conductive copper sheet; 14-an acoustic emission probe; 15-quadrangular transparent rock mass model; 16-a lower press plate; 17-prefabricating cracks; 18-low resistance tester; 19-an acoustic emission detection device; 20-a data processor; 21 a computer; 22-a high-speed camera; 23-a wire; 24-angle steel; 25-a screw; 26-narrow steel columns; 27-test stand; 28-high speed camera; 29-a drilling device; 29-grouting means; 30-a stirrer; 31 a valve; 32-a metering pump; 33-a pulp conveying pipe; 34-grouting pipe.
Detailed Description
As shown in figures 1-10, an organic grouting material diffusion test device based on transparent rock mass, its characterized in that: the device comprises a transparent rock mass material processing device, a loading device, a monitoring device, a drilling device, a grouting device and a fixed connecting device;
the transparent rock mass material processing device comprises a frame-shaped test bed wall and a press machine, wherein the press machine is fixed on a horizontal steel plate on the bottom surface through a support; the press is a two-column press 1; the bottom surface of the test bed is a horizontal steel bottom plate 7, a fixed steel plate 9 with a square cross section is arranged in the center of the bottom plate, the middle part of the fixed steel plate 9 is of a hollow structure, and the cross section of the hollow structure is a square cross section and is used for fixing a frame-shaped test bed wall; the frame-shaped test bed wall comprises a left side plate wall, a right side plate wall 3, a front side plate wall, a rear side plate wall 4 and a front side plate wall and a rear side plate wall, wherein the left side plate wall and the right side plate wall are fixed through positive and negative locking, and a space with a square section is formed by the four plate walls; the fixed steel plate 9 is fixed on a horizontal bottom plate 7 at the bottom through 4 screws 6; the four plate walls are divided into a group of two, wherein one group is provided with a positive lock catch, the other group is provided with a negative lock catch, and the four plate walls are locked by the positive and negative locks;
the loading device is a multi-field coupling microcomputer electrohydraulic servo rock mass triaxial press;
the monitoring device comprises an acoustic emission detection device 18, a low resistance tester 19, a high-speed camera 22, a polyethylene insulating board 12, a conductive copper sheet 13, an acoustic emission probe 14, a lead 23, a data processor 20 and a computer 21; the transparent rock mass model is positioned between an upper pressing plate 11 and a lower pressing plate 16 of a loading device triaxial press, a polyethylene insulating plate 12 is arranged above the lower pressing plate 16 of the press, conductive copper sheets 13 are adhered to the upper end surface and the lower end surface of the transparent rock mass model, the transparent rock mass model is placed on the polyethylene insulating plate 13, and the same polyethylene insulating plate 13 is arranged above the transparent rock mass model; a low resistance tester 19 and a high speed camera are placed 22 in front of the press, the conductive copper sheet 13 is connected with the low resistance tester 19, the acoustic emission probe 14 is connected with the quadrangular transparent rock mass model 15 by AB glue, and the other end of the acoustic emission probe 14 is connected with an acoustic emission detection device 18 and then connected with a data processor 20 and a computer 21;
the fixed connecting device comprises a transparent rock mass model fixing device, a drilling pipe and a grouting pipe fixing device. The device comprises: 4 angle steels 24 are placed on the test bed 27, the transparent rock mass model is positioned in a space formed by the angle steels, the bottom of each angle steel 24 is provided with 4 screw holes, and the angle steels 24 are connected with the test bed 27 through screws 25; two narrow steel plates 26 are arranged on the vertical and horizontal central lines of the test bed 27 and on the right side of the angle steel 24, circular holes are formed above the steel plates, screw holes are formed below the steel plates, and the steel plates 26 are connected with the test bed 27 through screws 25; a high-speed camera 15 is arranged right in front of the test bed in the longitudinal horizontal direction and right opposite to the transparent rock mass model 16;
the drilling device is a T-shaped thin steel pipe 30;
the slip casting device adopts organic thick liquid slip casting device, and the slip casting device includes: a stirrer 30, a valve 31, a metering pump 32 and a slurry conveying pipe 33; a grouting pipe 34; a cover is arranged above the stirrer 30, and materials can be put in the stirrer after the cover is opened; the stirrer 30 is connected with a metering pump 32 through a pipeline, and a valve 31 is arranged between the stirrer 30 and the metering pump; the metering pump 32 is connected with a pulp conveying pipe 33; the other end of the slurry conveying pipe 33 is connected with a slurry injection pipe 34;
in the device, the bottom plate 7 with the horizontal bottom of the transparent rock mass material processing device is provided with the square boss 5 during casting, the cross section area of the square boss 5 is square and is positioned in the middle of the bottom plate 7, the thickness of the square boss 5 is consistent with that of the fixed steel plate 9, and a gap with the same thickness as that of the plate wall is formed between the edge of the square boss 5 and the inner section of the fixed steel plate 9 and is used for fixing the plate walls 3 and 4 of the test bed, so that the four plate walls can be tightly nested in the gap between the square boss 5 of the bottom plate and the fixed steel plate 9.
In the device, the universal wheel 8 is arranged at the bottom of the test bed support column, and the universal wheel 8 is a lockable universal wheel.
In the device, the drilling pipe and the grouting pipe are fixed through circular holes on two narrow steel plates 20 on the wooden desktop; the positions of the table plates connected with the screw holes are provided with grooves, and the grooves at the positions of the screw holes and the table plates are leveled by epoxy ethyl ester materials.
The method for implementing the organic grouting material diffusion test of the transparent rock body by adopting the device comprises the following steps:
(1) preparing required materials, including materials required by transparent rock mass and materials required by grouting slurry;
(2) preparing a transparent rock mass material, calculating a similar simulation material according to a similarity ratio according to strength parameters and a similar theory obtained by a rock mechanics test, and proportioning the transparent rock mass material which meets the strength converted by the similarity ratio by adopting liquid paraffin, a tridecane solution and silicon powder; carrying out a grouting experiment according to needed grouting parameters, and proportioning grouting materials meeting the grouting parameters by adopting proper organic grouting materials;
(3) pouring and molding a test piece (shown in figure 1), placing the transparent rock mass material which is proportioned and uniformly stirred in the step (2) into a viscous state to a colloidal state, namely when the deformation property of the material is similar to plasticine, the material has stronger plasticity, pouring the material into a frame-shaped test bed wall of a transparent rock mass material processing device, modulating the pressure of a press machine to the pressure calculated in the step (2), maintaining the transparent rock mass model at constant pressure, after 24 hours, completely solidifying slurry, having mechanical strength according with similar strength ratio, taking down the poured and molded transparent rock mass by removing plate walls around the test bed, placing the transparent rock mass in a ventilation position, periodically maintaining and naturally drying; after air drying, grinding the upper end surface and the lower end surface of the test piece by using a stone grinder, wherein the non-parallelism of the two end surfaces of the test piece is required to be not more than 0.01mm, the upper end surface and the lower end surface of the test piece are perpendicular to the four side surfaces, the maximum deviation is not more than 0.25 degrees, the four side surfaces of the test piece are smooth and flat, and every two adjacent side surfaces are perpendicular to each other; 1 cube transparent rock mass model 1 is manufactured according to the steps and is compiled into a control group 1;
(4) pre-fracturing a test piece (shown in figure 4), placing the transparent rock mass model prepared in the step (3) between an upper pressing plate and a lower pressing plate of a press machine by using a multi-field coupling micro electro-hydraulic servo rock triaxial press machine, stacking a polyethylene insulating plate above the lower pressing plate of the press machine, sticking conductive copper sheets on the upper end surface and the lower end surface of the transparent rock mass model, placing the transparent rock mass model on the polyethylene insulating plate, and arranging the same polyethylene insulating plate above the transparent rock mass model at the contact part with the upper pressing plate; the monitoring device is placed in front of the transparent rock mass model, the conductive copper sheet is connected with the low-resistance tester, the acoustic emission probe is connected with the transparent rock mass model by AB glue, and the other end of the acoustic emission probe is connected with the acoustic emission detection device and then connected with the data processor and the computer; performing uniaxial compression on the transparent rock mass model obtained in the step (3) until the transparent rock mass model is fractured; analyzing the distribution and expansion conditions of cracks in the test piece in the compression process by using a high-speed camera to obtain the pressure required by manufacturing the prefabricated crack test piece;
FIG. 4 is a schematic view of the fracture loading of a transparent rock mass; the transparent rock mass model 15 made by the transparent rock mass material processing device is positioned between the upper pressing plate 11 and the lower pressing plate 16, the bottom of the quadrangular transparent rock mass model 15 is contacted with the lower pressing plate 16 through the conductive copper sheet 13 and the polyethylene insulation plate 12, the top of the quadrangular transparent rock mass model is contacted with the upper pressing plate 11 through the conductive copper sheet 13 and the polyethylene insulation plate 12, the upper part of the upper pressing plate 11 is contacted with the press machine, and the lower pressing plate 16 is positioned above the horizontal test bed; acoustic emission probes 14 are uniformly arranged on the outer side surface of the transparent rock mass model 15;
(5) manufacturing a prefabricated crack test piece: according to the test piece pouring forming process in the step (3) and the pressure required by the corresponding crack obtained in the step (4), pre-fracturing is carried out on the transparent rock body model by using a multi-field coupling micro electro-hydraulic servo rock triaxial press machine to obtain a corresponding prefabricated crack test piece;
(6) preparing a grouting device (shown in figure 5), placing a transparent rock model on a fixing device, drilling a needed hole through a drilling hollow pipe, then adopting a double-liquid grouting device, calculating the proportion of the grouting materials obtained in the step (2), selecting the optimal proportion, adding the grouting device, and performing a grouting experiment;
(7) monitoring: injecting the organic slurry prepared in the step (6) into a prefabricated crack test piece under the action of the pressure of a grouting device, and simultaneously opening a high-speed camera and recording test data;
by adopting different fracturing modes, prefabricated fracture test pieces containing fractures in different directions and different angles are obtained, and the diffusion mode and the diffusion radius of the organic slurry under different fractures of the transparent rock are explored;
by changing the grouting pressure of a grouting pump, the diffusion mode and the diffusion radius of the organic grout in the transparent rock body under different grouting pressures are researched.
In the method, the selected grouting pump is a metering pump; the organic grouting material is urea-formaldehyde resin and additive liquid, and the ammonium chloride accounts for 1% of the mass of the urea-formaldehyde resin.
In the method, the transparent rock mass material is prepared from the following raw materials in parts by mass: liquid paraffin: n-tridecane solution: silicon powder =1: (0.63-0.82): (1.1-1.3). Further, the transparent rock mass material is prepared from the following raw materials in parts by mass: liquid paraffin: n-tridecane solution: the silicon powder =1:0.815:1.15, and the transparent rock mass material has the best performance and the best transparency.
In the steps (4) and (5), the transparent rock mass model is subjected to one-dimensional loading in a loading mode of the transparent rock mass cracks, so that unidirectional cracks can be obtained; carrying out two-dimensional loading, and manufacturing an oblique crack by different pressures of two vertical surfaces of the two-dimensional loading; and (3) carrying out true triaxial loading to prefabricate the cracks in different directions and different angles, and selecting different pressure modes according to different requirements to obtain corresponding prefabricated crack test pieces.

Claims (10)

1. The utility model provides an organic slip casting material diffusion test device based on transparent rock mass which characterized in that: the device comprises a transparent rock mass material processing device, a loading device, a monitoring device, a drilling device, a grouting device and a fixed connecting device;
the transparent rock mass material processing device comprises a frame-shaped test bed wall and a press machine, wherein the press machine is fixed on a horizontal steel plate on the bottom surface through a support; the press machine is a two-column press machine; the bottom surface of the test bed is a horizontal steel bottom plate, a fixed steel plate with a square cross section is arranged in the center of the bottom plate, the middle part of the fixed steel plate is of a hollow structure, and the cross section of the hollow structure is a square cross section and is used for fixing a frame-shaped test bed wall; the frame-shaped test bed wall comprises a left side plate wall, a right side plate wall, a front side plate wall and a rear side plate wall, the left side plate wall and the right side plate wall are fixed through positive and negative locking, and a space with a square section is formed by the four plate walls in a surrounding mode; the fixed steel plate is fixed on a horizontal bottom plate at the bottom through 4 turnbuckles; the four plate walls are divided into a group of two, wherein one group is provided with a positive lock catch, the other group is provided with a negative lock catch, and the four plate walls are locked by the positive and negative locks;
the loading device is a multi-field coupling microcomputer electrohydraulic servo rock mass triaxial press;
the monitoring device comprises an acoustic emission detection device, a low resistance tester, a high-speed camera, a polyethylene insulation board, a conductive copper sheet, an acoustic emission probe, a wire, a data processor and a computer; the transparent rock mass model is positioned between an upper pressing plate and a lower pressing plate of a triaxial press of the loading device, a polyethylene insulation plate is arranged above the lower pressing plate of the press, conductive copper sheets are adhered to the upper end surface and the lower end surface of the transparent rock mass model, the transparent rock mass model is placed on the polyethylene insulation plate, and the same polyethylene insulation plate is arranged above the transparent rock mass model; the low-resistance tester and the high-speed camera are placed in front of the press, the conductive copper sheet is connected with the low-resistance tester, the acoustic emission probe is connected with the quadrangular transparent rock mass model by AB glue, and the other end of the acoustic emission probe is connected with the acoustic emission detection device and then connected with the data processor and the computer;
the drilling device is a T-shaped thin steel pipe;
the slip casting device adopts organic thick liquid slip casting device, and the slip casting device includes: a stirrer, a valve, a metering pump and a slurry conveying pipe; a cover is arranged above the stirrer, and the materials can be put in the stirrer after the cover is opened; the stirrer is connected with the metering pump through a pipeline, and a valve is arranged between the stirrer and the metering pump; the metering pump is connected with the slurry conveying pipe; the other end of the slurry conveying pipe is connected with a slurry injection pipe;
the fixed connecting device comprises a test bed, wherein 4 pieces of angle steel are vertically placed on the test bed, the transparent rock mass model is placed in a space formed by the angle steel, the bottom of each angle steel comprises 4 screw holes, and the angle steel is connected with the test bed through screws; two narrow steel plates are arranged on the right side of the angle steel on the longitudinal horizontal central line of the test bed, a circular hole is formed above each steel plate, a screw hole is formed below each steel plate, and the steel plates are connected with the test bed through screws; a high-speed camera is arranged right in front of the test bed in the longitudinal horizontal direction and right opposite to the transparent rock mass model.
2. The organic grouting material diffusion test device based on the transparent rock mass as claimed in claim 1, wherein a square boss is arranged in the middle of the bottom plate of the transparent rock mass material processing device, the cross section area of the square boss is square, the thickness of the boss is consistent with that of the fixed steel plate, and a gap consistent with the thickness of the plate wall is formed between the edge of the boss and the inner cross section of the fixed steel plate and used for fixing the plate wall of the test bed, so that the four plate walls can be tightly nested in the gap between the lug of the bottom plate and the fixed steel plate.
3. The organic grouting material diffusion test device based on the transparent rock mass as claimed in claim 1, wherein universal wheels are arranged at the bottom of the test bed supporting column and are lockable universal wheels.
4. The organic grouting material diffusion test device based on the transparent rock mass as claimed in claim 1, wherein the selected grouting slurry is organic slurry, including polyurethane, phenolic resin, unsaturated polyester resin or epoxy ethyl ester.
5. The organic grouting material diffusion test device based on the transparent rock mass as claimed in claim 1, wherein the grouting pump of the grouting device is a metering pump capable of accurately metering grout.
6. The organic grouting material diffusion test device based on the transparent rock mass as claimed in claim 1, wherein the drilling pipe and the grouting pipe are fixed through circular holes on two narrow steel plates on the wooden table top; the positions of the table plates connected with the screw holes are provided with grooves, and the grooves at the positions of the screw holes and the table plates are leveled by epoxy ethyl ester materials.
7. A transparent rock mass-based organic grouting material diffusion test method, which adopts the transparent rock mass-based organic grouting material diffusion test device of any one of claims 1 to 6, and is characterized by comprising the following steps:
(1) preparing required materials, including materials required by transparent rock mass and materials required by grouting slurry;
(2) preparing a transparent rock mass material, calculating a similar simulation material according to a similarity ratio according to strength parameters and a similar theory obtained by a rock mechanics test, and proportioning the transparent rock mass material which meets the strength converted by the similarity ratio by adopting liquid paraffin, a tridecane solution and silicon powder; carrying out a grouting experiment according to needed grouting parameters, and proportioning grouting materials meeting the grouting parameters by adopting proper organic grouting materials;
(3) pouring and molding a test piece, namely placing the transparent rock mass material which is proportioned and uniformly stirred in the step (2) into a viscous state to a colloidal state, namely when the deformation property of the material is similar to plasticine, the material has stronger plasticity, at the moment, pouring the material into a frame-shaped test bed wall of a transparent rock mass material processing device, modulating the pressure of a press machine to the pressure calculated in the step (2), maintaining the transparent rock mass model at constant pressure, after 24 hours, completely solidifying slurry, and having mechanical strength according with the strength similarity ratio, removing plate walls around the test bed, taking down the poured and molded transparent rock mass, placing the transparent rock mass in a ventilation position, periodically maintaining, and naturally air-drying; after air drying, grinding the upper end surface and the lower end surface of the test piece by using a stone grinder, wherein the non-parallelism of the two end surfaces of the test piece is required to be not more than 0.01mm, the upper end surface and the lower end surface of the test piece are perpendicular to the four side surfaces, the maximum deviation is not more than 0.25 degrees, the four side surfaces of the test piece are smooth and flat, and every two adjacent side surfaces are perpendicular to each other; 1 cube transparent rock mass model 1 is manufactured according to the steps and is compiled into a control group 1;
(4) pre-fracturing a test piece, namely placing the transparent rock mass model prepared in the step (3) between an upper pressing plate and a lower pressing plate of a press machine by using a multi-field coupling micro electro-hydraulic servo rock triaxial press machine, stacking a polyethylene insulating plate above the lower pressing plate of the press machine, sticking conductive copper sheets on the upper end surface and the lower end surface of the transparent rock mass model, placing the transparent rock mass model on the polyethylene insulating plate, and arranging the same polyethylene insulating plate above the transparent rock mass model at the contact part with the upper pressing plate; the monitoring device is placed in front of the transparent rock mass model, the conductive copper sheet is connected with the low-resistance tester, the acoustic emission probe is connected with the transparent rock mass model by AB glue, and the other end of the acoustic emission probe is connected with the acoustic emission detection device and then connected with the data processor and the computer;
performing uniaxial compression on the transparent rock mass model obtained in the step (3) until the transparent rock mass model is fractured; analyzing the distribution and expansion conditions of cracks in the test piece in the compression process by using a high-speed camera to obtain the pressure required by manufacturing the prefabricated crack test piece;
(5) manufacturing a prefabricated crack test piece: according to the test piece pouring forming process in the step (3) and the pressure required by the corresponding crack obtained in the step (4), pre-fracturing is carried out on the transparent rock body model by using a multi-field coupling micro electro-hydraulic servo rock triaxial press machine to obtain a corresponding prefabricated crack test piece;
(6) preparing a grouting device, namely placing the transparent rock mass model on a fixing device, drilling a needed hole through a drilling hollow pipe, then adopting an organic slurry grouting device, calculating the proportion of the grouting materials obtained in the step (2), selecting the optimal proportion, adding the grouting device, and performing a grouting experiment;
(7) monitoring: injecting the organic slurry prepared in the step (6) into a prefabricated crack test piece under the action of the pressure of a grouting device, and simultaneously opening a high-speed camera and recording test data;
by adopting different fracturing modes, prefabricated fracture test pieces containing fractures in different directions and different angles are obtained, and the diffusion mode and the diffusion radius of slurry under different fractures of the transparent rock are explored;
by changing the grouting pressure of a grouting pump, the diffusion mode and the diffusion radius of the organic grout in the transparent rock body under different grouting pressures are researched.
8. The organic grouting material diffusion test method based on transparent rock mass according to claim 7, characterized in that: the transparent rock mass material is prepared from the following raw materials in parts by mass: liquid paraffin: n-tridecane solution: silicon powder =1: (0.63-0.82): (1.1-1.3).
9. The organic grouting material diffusion test method based on transparent rock mass according to claim 7, characterized in that: the mass ratio of the raw materials for preparing the transparent rock mass material is as follows: liquid paraffin: n-tridecane solution: the silicon powder =1:0.815:1.15, and the transparent rock mass material has the best performance and the best transparency.
10. The organic grouting material diffusion test method based on transparent rock mass according to claim 7, characterized in that: in the fifth step and the sixth step, when one-dimensional loading is carried out on the transparent rock mass fracture in a loading mode, unidirectional fractures are obtained; during two-dimensional loading, inclined cracks are manufactured through different pressures of two vertical surfaces of the two-dimensional loading; loading and prefabricating fractures in different directions and different angles through true triaxial; and selecting different pressure modes according to different requirements to obtain the corresponding prefabricated crack test piece.
CN202110241622.3A 2021-03-04 2021-03-04 Organic grouting material diffusion test device and method based on transparent rock mass Pending CN113049448A (en)

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