CN116399732A - Visual test system and method for rapid auxiliary rock breaking through freezing and thawing cold and hot impact - Google Patents
Visual test system and method for rapid auxiliary rock breaking through freezing and thawing cold and hot impact Download PDFInfo
- Publication number
- CN116399732A CN116399732A CN202310671969.0A CN202310671969A CN116399732A CN 116399732 A CN116399732 A CN 116399732A CN 202310671969 A CN202310671969 A CN 202310671969A CN 116399732 A CN116399732 A CN 116399732A
- Authority
- CN
- China
- Prior art keywords
- rock
- sample
- test system
- visual test
- cold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011435 rock Substances 0.000 title claims abstract description 114
- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 230000000007 visual effect Effects 0.000 title claims abstract description 32
- 238000010257 thawing Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000007710 freezing Methods 0.000 title claims abstract description 13
- 230000008014 freezing Effects 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 238000002347 injection Methods 0.000 claims abstract description 46
- 239000007924 injection Substances 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 42
- 230000005641 tunneling Effects 0.000 claims abstract description 29
- 238000013170 computed tomography imaging Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 238000005065 mining Methods 0.000 claims abstract description 17
- 230000009471 action Effects 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000010998 test method Methods 0.000 claims abstract description 6
- 239000000523 sample Substances 0.000 claims description 120
- 238000005553 drilling Methods 0.000 claims description 44
- 230000007246 mechanism Effects 0.000 claims description 17
- 238000009412 basement excavation Methods 0.000 claims description 11
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 10
- 230000035882 stress Effects 0.000 claims description 10
- 230000003044 adaptive effect Effects 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 230000008646 thermal stress Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 239000011707 mineral Substances 0.000 abstract description 6
- 239000002360 explosive Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a visual test system for quick auxiliary rock breaking by freezing and thawing cold and hot impact, which belongs to the technical field of non-explosive mechanized mining model tests of deep hard rock mineral deposits and comprises a control device, a confining pressure device, a water injection device, a microwave heating device, a liquid nitrogen cooling device, a tunneling device, a CT imaging device and a sample box, wherein the sample box is placed on a turntable of the CT imaging device, the microwave heating device, the water injection device and the confining pressure device are arranged in the sample box, the liquid nitrogen cooling device is arranged at the top of the sample box, and the tunneling device is arranged at one side of the CT imaging device. The visual test system and the visual test method are adopted to realize the test process of rock breaking and auxiliary tunneling under the action of cold and hot impact, are used for acquiring test data of the rock breaking process in the deep metal ore mining process and opening the black box evolution process of the rock tunneling process.
Description
Technical Field
The invention relates to the technical field of non-explosive mechanized mining model tests of deep hard rock deposits, in particular to a visual test system and method for quick auxiliary rock breaking by freezing and thawing cold and hot impact.
Background
Through continuous high-strength development for many years, shallow metal mineral resources in China are gradually reduced or exhausted, and the exploitation of the metal mineral resources is in a fully deep-oriented advancing stage. Deep mining is the most urgent problem faced by the development of metal mineral resources in China, and is the most important way for guaranteeing sustainable development and supply of the metal mineral resources in China in the future. Traditional shallow mining modes and methods have not been suitable for deep high stress fields, high well temperatures, rock mass structural changes, and complex geological conditions. The conventional mining tunneling rock breaking method generally adopts a drilling and blasting method, the surrounding rock stability is damaged by the drilling and blasting process, the mining safety is threatened, and the method is used for mining the ores and the waste stones together, so that the lifted waste stone amount and the workload of mineral dressing operation are greatly increased. In order to improve the automation accurate and efficient mining level of the deep well, a method for accurately cutting and mining must be studied.
The current accurate cutting method comprises the following steps: mechanical continuous cutting tunneling and mining technology, high-pressure water jet rock breaking tunneling and mining technology, plasma rock breaking tunneling and mining technology and the like. However, the above techniques are limited by the form of the deposit, the geological conditions and the associated equipment. The laser or microwave assisted rock breaking tunneling technology is a new technology advocated at present, however, microwave assisted rock breaking is to irradiate the rock in a certain mode and degree by microwaves in advance, the inside of the irradiated rock is subjected to cracking phenomena such as temperature change, stress increase, thermal cracking and the like, the hardness and strength of the rock are obviously reduced, the drillability is greatly improved, and then the rock is cut by a mechanical cutter to finish excavation. The microwave-assisted rock breaking technology can obviously reduce mechanical abrasion, obviously reduce rock excavation construction cost and improve mechanical excavation speed and efficiency. In addition to the characteristics of the rock, external factors such as the microwave irradiation intensity, irradiation duration, irradiation interval, cooling mode and the like have obvious influence on the microwave irradiation effect, and intensive researches are required. Therefore, a visual test system and a visual test method for rapid auxiliary rock breaking of freeze thawing cold and hot impact are needed to be used for cold and hot impact research, and reference data is provided for actual excavation engineering.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems occurring in the prior art.
In order to achieve the aim, the invention provides a visual test system for rapid auxiliary rock breaking by freezing and thawing cold and hot impact, which comprises a control device, a confining pressure device, a water injection device, a microwave heating device, a liquid nitrogen cooling device, a tunneling device, a CT imaging device and a sample box, wherein a rock sample is placed in the sample box and is placed on a turntable of the CT imaging device, the microwave heating device, the water injection device and the confining pressure device are arranged in the sample box, the liquid nitrogen cooling device is arranged at the top of the sample box, the tunneling device is arranged on one side of the CT imaging device and is opposite to the sample box, and the confining pressure device, the water injection device, the microwave heating device, the liquid nitrogen cooling device, the tunneling device and the CT imaging device are all electrically connected with the control device.
Preferably, a liquid nitrogen connector is arranged on the side face of the sample box, a tunneling hole is formed in the front face of the sample box, a plurality of holes are formed in the rock sample, and a wireless frost heaving force probe is arranged in each hole and is communicated with the control device.
Preferably, the confining pressure device comprises three confining pressure mechanisms, each confining pressure mechanism comprises a confining pressure base plate and a pressure hydraulic bag which are oppositely arranged, each confining pressure base plate is oppositely arranged with the rock sample, and the three pressure hydraulic bags are respectively fixed on the first side face, the top face and the back face of the sample box and are electrically connected with the control device.
Preferably, the water injection device comprises a water injection base plate, one side of the water injection base plate is provided with a plurality of water outlets, the middle part of the water injection base plate is provided with a serpentine water passage, each water outlet is communicated with the serpentine water passage, one side of the water injection base plate is provided with a water injection joint communicated with the serpentine water passage, and the water injection joint is connected with the water supply servo water pump through a pipeline.
Preferably, the microwave heating device comprises a first microwave heating plate and a second microwave heating plate, the first microwave heating plate and the second microwave heating plate are respectively arranged at the bottom and the second side surface of the sample box, and the first microwave heating plate and the second microwave heating plate are electrically connected with the control device.
Preferably, the liquid nitrogen cooling device comprises a liquid nitrogen tank and a liquid nitrogen injection pipeline, wherein the liquid nitrogen tank is fixed at the top of the sample tank and is connected with the liquid nitrogen injection pipeline through a proportional electromagnetic valve, the liquid nitrogen injection pipeline is connected with the liquid nitrogen connector, and the proportional electromagnetic valve is electrically connected with the control device.
Preferably, the tunneling device comprises a drilling machine base, a drilling machine upright post, a drilling machine bracket and a drilling machine, wherein the drilling machine is arranged on a slideway of the drilling machine bracket, the drilling machine bracket is arranged on a slideway of the drilling machine upright post, the drilling machine upright post is arranged on a slideway of the drilling machine base, and the drilling machine is electrically connected with the control device.
Preferably, the drilling machine column is provided with a drilling machine impacter, and the drilling machine impacter is connected with a drilling machine.
Preferably, a sample adapting mechanism is arranged on the periphery of the rock sample, and the sample adapting mechanism comprises a first size-changing backing plate and a second size-changing backing plate;
the first size-changing base plate comprises a plurality of first contact base plates and a first middle top plate, the sizes of the first contact base plates are sequentially reduced, first accommodating grooves are formed in the first contact base plates, first telescopic cylinders are arranged in the first accommodating grooves, adjacent first contact base plates are connected through the first telescopic cylinders, and the first middle top plate is connected with the first telescopic cylinders in the first contact base plates with the smallest sizes;
the second variable-size backing plate comprises a plurality of second contact backing plates and a second middle top plate, the sizes of the second contact backing plates are sequentially reduced, second accommodating grooves are formed in the second contact backing plates, second telescopic cylinders are arranged in the second accommodating grooves, adjacent second contact backing plates are connected through the second telescopic cylinders, the second middle top plate is connected with the second telescopic cylinders in the second contact backing plates with the smallest sizes, the end faces of the second middle top plate and the second contact backing plates are provided with adaptive water outlets, the adaptive water outlets are communicated with the circular water channels in the second contact backing plates, and the circular water channels in the second contact backing plates are connected with a water supply servo water pump through respective joints.
A visual test method based on the freeze thawing cold-hot impact rapid auxiliary rock breaking test system comprises the following specific steps:
step S1: rock blocks with different sizes are obtained under a mine well, a square rock sample is prepared in a laboratory, and a plurality of holes with diameters of 1-3 cm are formed in the rock sample;
s2, installing a sample adapting mechanism to fix the prepared rock sample, then placing the rock sample in a sample box, applying pressure to the rock sample in a three-way confining pressure through a confining pressure device, and simulating a ground stress state;
step S3: the method comprises the steps of simulating a disturbance environment of deep mining by applying vibration through a drilling machine impactor, heating a rock sample arranged in a sample box through a microwave heating device, and acquiring an image of damage of the rock sample under the action of thermal stress through a CT imaging device after heating;
step S4: after heating for a set time, a wireless frost heaving force probe is installed in a hole, water is injected into the hole through a water supply servo water pump, meanwhile, the liquid nitrogen cooling device is used for cooling to freeze water in the hole, the wireless frost heaving force probe collects frost heaving force data in real time, a frost heaving force evolution curve and a rock sample stress distribution image under the action of frost heaving force are obtained, and after frost heaving damage is generated on the rock sample, the image of the rock sample under the action of the frost heaving force is collected through a CT imaging device;
step S5: repeating the steps S3-S4, repeatedly carrying out cold and hot impact with set degree, and enabling the rock sample to be subjected to multiple times of cold and hot impact, so as to obtain damage degree data of the rock sample with different times of freezing and thawing, different times of heating, different times of freezing and thawing holding and heating holding;
step S6: performing impact drilling excavation on rock samples subjected to different cold and hot impact actions through a drilling machine, acquiring rock sample crushing images in the drilling process through a CT imaging device, calculating a crushing degree fractal dimension, and acquiring the relation between the crushing degree and cold and hot impact parameters;
step S7: and (3) repeating the steps S1-S6, quantitatively analyzing the difficulty level of rock excavation and tunneling under different cold and hot impacts, and making a construction decision.
Therefore, the visual test system and the visual test method for rapid auxiliary rock breaking by using cold-thawing cold-hot impact have the following beneficial effects: the method realizes the test process of breaking and excavating the rock under the action of thermal shock, is used for acquiring the data of the rock breaking process in the deep metal ore mining process, and opens the black box evolution process of the rock tunneling process.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic structural diagram of a visual test system for quick auxiliary rock breaking by freezing and thawing cold and hot impact;
FIG. 2 is a schematic view showing the internal structure of a sample box according to embodiment 1 of the present invention;
FIG. 3 is a schematic perspective view of a sample box according to the present invention;
FIG. 4 is a cross-sectional view of a water injection pad of the present invention;
FIG. 5 is a schematic diagram of the tunneling device of the present invention;
FIG. 6 is a schematic view showing the internal structure of a sample box according to embodiment 2 of the present invention;
FIG. 7 is a schematic view of a first variable-size pad structure according to the present invention;
FIG. 8 is a schematic view of a second variable-size pad structure according to the present invention.
Reference numerals
1. A control device; 2. a confining pressure device; 21. a confining pressure backing plate; 22. a pressing hydraulic bag; 3. a water injection backing plate; 31. a water injection joint; 32. a serpentine water passage; 33. a water outlet; 4. a microwave heating device; 41. a first microwave heating plate; 42. a second microwave heating plate; 5. a liquid nitrogen cooling device; 51. a liquid nitrogen tank; 52. liquid nitrogen is injected into the pipeline; 6. a tunneling device; 61. a drill base; 62. a drilling machine upright post; 63. a drill support; 64. a drilling machine; 65. a drill impactor; 7. a CT imaging device; 71. a turntable; 8. a sample box; 81. tunneling holes; 9. rock sample; 91. a hole; 10. a first contact pad; 101. a first accommodation groove; 11. a first telescopic cylinder; 12. a second contact pad; 121. adapting to a water outlet; 122. a circular water passage; 13. a first middle top plate; 14. and a second middle top plate.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the visual test system for rapid auxiliary rock breaking by freezing and thawing cold and hot impact comprises a control device 1, a confining pressure device 2, a water injection device, a microwave heating device 4, a liquid nitrogen cooling device 5, a tunneling device 6, a CT imaging device 7 and a sample box 8.
As shown in fig. 2-4, a microwave heating device 4, a water injection device and a confining pressure device 2 are arranged in the sample box 8, the confining pressure device 2 comprises three confining pressure mechanisms, each confining pressure mechanism comprises a confining pressure base plate 21 and a pressure-applying hydraulic bag 22, the confining pressure base plates 21 are arranged opposite to the rock sample 9, the three pressure-applying hydraulic bags 22 are respectively fixed on the first side face, the top face and the back face of the sample box 8, and the pressure-applying hydraulic bags 22 are electrically connected with the control device 1 and used for providing stress in three directions. The water injection device comprises a water injection base plate 3, a plurality of water outlets 33 are formed in one side of the water injection base plate 3, a serpentine water passage 32 is formed in the middle of the water injection base plate 3, each water outlet 33 is communicated with the serpentine water passage 32, a water injection joint 31 communicated with the serpentine water passage 32 is arranged on one side of the water injection base plate 3, and the water injection joint 31 is connected with a water supply source through a pipeline and used for realizing water injection operation. The microwave heating device 4 comprises a first microwave heating plate 41 and a second microwave heating plate 42, the first microwave heating plate 41 and the second microwave heating plate 42 are respectively arranged at the bottom and the second side surface of the sample box 8, and the first microwave heating plate 41 and the second microwave heating plate 42 are electrically connected with the control device 1 and are used for radiation heating of the rock sample 9.
The liquid nitrogen cooling device 5 is arranged at the top of the sample box 8, the liquid nitrogen cooling device 5 comprises a liquid nitrogen tank 51 and a liquid nitrogen injection pipeline 52, the liquid nitrogen tank 51 is fixed at the top of the sample box 8 and is connected with the liquid nitrogen injection pipeline 52 through a proportional electromagnetic valve, the liquid nitrogen injection pipeline 52 is connected with a liquid nitrogen connector, and the proportional electromagnetic valve is electrically connected with the control device 1 and used for controlling the injection amount of liquid nitrogen so as to control the freezing speed.
As shown in fig. 5, the tunneling device 6 is disposed on one side of the CT imaging device 7 for excavating a rock sample 9, the tunneling device 6 includes a drill base 61, a drill column 62, a drill support 63, and a drill 64, the drill 64 is mounted on a slide of the drill support 63, the drill support 63 is mounted on a slide of the drill column 62, the drill column 62 is mounted on a slide of the drill base 61, the mounting position of the drill 64 is adjustable, and the drill 64 is electrically connected with the control device 1. The drill column 62 is provided with a drill impactor 65, and the drill impactor 65 is connected with a drill 64 for providing an excavation disturbance.
Example 2
The difference between this embodiment and embodiment 1 is that when the rock mass is poor in integrity and difficult to sample, and a large-scale sample is not easily obtained, a small-scale sample can be used for the test, and for this purpose, this embodiment is provided with a sample adaptation mechanism for a rock sample of a smaller size, and as shown in fig. 6 to 8, the periphery of the rock sample is provided with the sample adaptation mechanism, and the sample adaptation mechanism includes a first size-changing backing plate and a second size-changing backing plate.
The first variable-size pad comprises a number of first contact pads 10, which in turn decrease in size, and a first intermediate top plate 13, which in this embodiment is provided with two first contact pads 10 of different sizes,
the first contact base plates 10 are provided with first accommodating grooves 101 for accommodating adjacent first contact base plates 10, first telescopic cylinders 11 are arranged in the first accommodating grooves 101, the adjacent first contact base plates 10 are connected through the first telescopic cylinders 11, and a first middle top plate 13 is connected with the first telescopic cylinders 11 in the first contact base plates 10 with the smallest size. The device can be used for adapting to three rock samples 9 with different sizes, the telescopic states of the first telescopic cylinders 11 in the two first contact base plates 10 are controlled according to the sizes of the actual rock samples 9, the rock samples 9 with different sizes are pressed, the first contact base plates 10 are non-metals, microwave heating can be used for heating the rock samples through the first variable-size base plates, and the heating process is not affected.
The second variable-size base plate comprises a plurality of second contact base plates 12 and a second middle top plate 14, the sizes of the second contact base plates are sequentially reduced, second accommodating grooves are formed in the second contact base plates 12, second telescopic cylinders are arranged in the second accommodating grooves, adjacent second contact base plates 12 are connected through the second telescopic cylinders, the second middle top plate 14 is connected with the second telescopic cylinders in the second contact base plates 12 with the smallest sizes, and the structure is similar to that of the first variable-size base plate. The end surfaces of the second middle top plate 14 and the second contact base plate 12 are provided with an adaptive water outlet 121, the adaptive water outlet 121 is communicated with a square water passage 122 inside the second contact base plate 12, and the square water passage 122 inside the second contact base plate 12 is connected with a water supply servo water pump through respective joints. The water injection operation of rock samples 9 of different sizes is achieved.
A visual test method based on a freeze thawing cold-hot impact rapid auxiliary rock breaking test system comprises the following specific steps:
step S1: rock blocks with different sizes are obtained underground a mine, a square rock sample 9 is prepared in a laboratory, and a plurality of holes 91 with diameters of 1-3 cm are formed in the rock sample 9.
And S2, judging whether a sample adapting mechanism is installed according to the size of the rock sample 9, when the rock sample 9 is smaller, fixing the prepared rock sample 9 by the installation sample adapting mechanism, then placing the rock sample in a sample box 8, pressing three-way confining pressure through a confining pressure device 2, and simulating a ground stress state.
Step S3: the disturbance environment of deep mining is simulated by applying vibration through the drill hammer 65, then the rock sample 9 arranged in the sample box 8 is heated through the microwave heating device 4, and after the heating is finished, an image of damage of the rock sample 9 under the action of thermal stress is acquired through the CT imaging device 7.
Step S4: after heating the set time, installing the wireless frost heaving force probe in the hole 91, then injecting water into the hole 91 through the water supply servo water pump, at the same time, cooling through the liquid nitrogen cooling device 5 to freeze water in the hole 91, acquiring frost heaving force data in real time by the wireless frost heaving force probe, acquiring a frost heaving force evolution curve and a stress distribution image of the rock sample 9 under the action of frost heaving force, and acquiring an image of the rock sample 9 under the action of the frost heaving force through the CT imaging device 7 after the rock sample 9 is subjected to frost heaving damage.
Step S5: and repeating the steps S3-S4, and repeatedly carrying out cold and hot impact with set degree to enable the rock sample 9 to be subjected to repeated cold and hot impact of freeze thawing for a plurality of times, so as to obtain damage degree data of the rock sample 9 at different times of freeze thawing, different times of heating, different times of freeze thawing and heating duration.
Step S6: the rock sample 9 subjected to different cold and hot impact actions is subjected to impact drilling excavation through a drilling machine 64, a crushing image of the rock sample 9 in the drilling process is obtained through a CT imaging device 7, the fractal dimension of the crushing degree is calculated, and the relation between the crushing degree and the cold and hot impact parameters is obtained.
Step S7: and (3) repeating the steps S1-S6, quantitatively analyzing the difficulty level of rock excavation and tunneling under different cold and hot impacts, and making a construction decision.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.
Claims (10)
1. A visual test system for quick auxiliary rock breaking of freeze thawing cold and hot impact comprises a control device and is characterized in that: still include confining pressure device, water injection device, microwave heating device, liquid nitrogen cooling device, tunneling device, CT imaging device and sample box, place the rock sample in the sample box and place on CT imaging device's revolving stage, be provided with microwave heating device, water injection device and confining pressure device in the sample box, liquid nitrogen cooling device sets up at sample box top, tunneling device sets up in CT imaging device one side and sets up relatively with the sample box, confining pressure device, water injection device, microwave heating device, liquid nitrogen cooling device, tunneling device, CT imaging device all are connected with controlling means electricity.
2. The visual test system for rapid auxiliary rock breaking by freeze thawing cold and hot impact according to claim 1, wherein the visual test system is characterized in that: the side of the sample box is provided with a liquid nitrogen connector, the front of the sample box is provided with a tunneling hole, the rock sample is provided with a plurality of holes, and a wireless frost heaving force probe is arranged in each hole and is communicated with the control device.
3. The visual test system for rapid auxiliary rock breaking by freeze thawing cold and hot impact according to claim 2, wherein the visual test system is characterized in that: the confining pressure device comprises three confining pressure mechanisms, each confining pressure mechanism comprises a confining pressure base plate and a pressure-applying hydraulic bag which are oppositely arranged, each confining pressure base plate is oppositely arranged with a rock sample, the three pressure-applying hydraulic bags are respectively fixed on the first side face, the top face and the back face of the sample box, and the pressure-applying hydraulic bags are electrically connected with the control device.
4. A visual test system for rapid auxiliary rock breaking by freezing and thawing cold and hot impact according to claim 3, wherein: the water injection device comprises a water injection base plate, a plurality of water outlets are formed in one side of the water injection base plate, a serpentine water passage is formed in the middle of the water injection base plate, each water outlet is communicated with the serpentine water passage, a water injection joint communicated with the serpentine water passage is arranged on one side of the water injection base plate, and the water injection joint is connected with a water supply servo water pump through a pipeline.
5. The visual test system for rapid auxiliary rock breaking by freeze thawing cold and hot impact according to claim 4, wherein the visual test system is characterized in that: the microwave heating device comprises a first microwave heating plate and a second microwave heating plate, the first microwave heating plate and the second microwave heating plate are respectively arranged at the bottom and the second side face of the sample box, and the first microwave heating plate and the second microwave heating plate are electrically connected with the control device.
6. The visual test system for rapid auxiliary rock breaking by freeze thawing cold and hot impact according to claim 5, wherein the visual test system is characterized in that: the liquid nitrogen cooling device comprises a liquid nitrogen tank and a liquid nitrogen injection pipeline, the liquid nitrogen tank is fixed at the top of the sample tank and is connected with the liquid nitrogen injection pipeline through a proportional electromagnetic valve, the liquid nitrogen injection pipeline is connected with a liquid nitrogen connector, and the proportional electromagnetic valve is electrically connected with the control device.
7. The visual test system for rapid auxiliary rock breaking by freeze thawing cold and hot impact according to claim 6, wherein the visual test system is characterized in that: the tunneling device comprises a drilling machine base, a drilling machine upright post, a drilling machine bracket and a drilling machine, wherein the drilling machine is arranged on a slideway of the drilling machine bracket, the drilling machine bracket is arranged on a slideway of the drilling machine upright post, the drilling machine upright post is arranged on a slideway of the drilling machine base, and the drilling machine is electrically connected with the control device.
8. The visual test system for rapid auxiliary rock breaking by freeze thawing cold and hot impact according to claim 7, wherein the visual test system is characterized in that: and the drilling machine column is provided with a drilling machine impacter which is connected with the drilling machine.
9. The visual test system for rapid auxiliary rock breaking by freeze thawing cold and hot impact according to claim 8, wherein the visual test system is characterized in that: the periphery of the rock sample is provided with a sample adapting mechanism, and the sample adapting mechanism comprises a first variable-size backing plate and a second variable-size backing plate;
the first size-changing base plate comprises a plurality of first contact base plates and a first middle top plate, the sizes of the first contact base plates are sequentially reduced, first accommodating grooves are formed in the first contact base plates, first telescopic cylinders are arranged in the first accommodating grooves, adjacent first contact base plates are connected through the first telescopic cylinders, and the first middle top plate is connected with the first telescopic cylinders in the first contact base plates with the smallest sizes;
the second variable-size backing plate comprises a plurality of second contact backing plates and a second middle top plate, the sizes of the second contact backing plates are sequentially reduced, second accommodating grooves are formed in the second contact backing plates, second telescopic cylinders are arranged in the second accommodating grooves, adjacent second contact backing plates are connected through the second telescopic cylinders, the second middle top plate is connected with the second telescopic cylinders in the second contact backing plates with the smallest sizes, the end faces of the second middle top plate and the second contact backing plates are provided with adaptive water outlets, the adaptive water outlets are communicated with the circular water channels in the second contact backing plates, and the circular water channels in the second contact backing plates are connected with a water supply servo water pump through respective joints.
10. A test method of a visual test system for rapid auxiliary rock breaking based on cold-thawing cold-hot impact according to any one of the claims 1-9, which is characterized by comprising the following specific steps:
step S1: rock blocks with different sizes are obtained under a mine well, a square rock sample is prepared in a laboratory, and a plurality of holes with diameters of 1-3 cm are formed in the rock sample;
s2, installing a sample adapting mechanism to fix the prepared rock sample, then placing the rock sample in a sample box, applying pressure to the rock sample in a three-way confining pressure through a confining pressure device, and simulating a ground stress state;
step S3: the method comprises the steps of simulating a disturbance environment of deep mining by applying vibration through a drilling machine impactor, heating a rock sample arranged in a sample box through a microwave heating device, and acquiring an image of damage of the rock sample under the action of thermal stress through a CT imaging device after heating;
step S4: after heating for a set time, a wireless frost heaving force probe is installed in a hole, water is injected into the hole through a water supply servo water pump, meanwhile, the liquid nitrogen cooling device is used for cooling to freeze water in the hole, the wireless frost heaving force probe collects frost heaving force data in real time, a frost heaving force evolution curve and a rock sample stress distribution image under the action of frost heaving force are obtained, and after frost heaving damage is generated on the rock sample, the image of the rock sample under the action of the frost heaving force is collected through a CT imaging device;
step S5: repeating the steps S3-S4, repeatedly carrying out cold and hot impact with set degree, and enabling the rock sample to be subjected to multiple times of cold and hot impact, so as to obtain damage degree data of the rock sample with different times of freezing and thawing, different times of heating, different times of freezing and thawing holding and heating holding;
step S6: performing impact drilling excavation on rock samples subjected to different cold and hot impact actions through a drilling machine, acquiring rock sample crushing images in the drilling process through a CT imaging device, calculating a crushing degree fractal dimension, and acquiring the relation between the crushing degree and cold and hot impact parameters;
step S7: and (3) repeating the steps S1-S6, quantitatively analyzing the difficulty level of rock excavation and tunneling under different cold and hot impacts, and making a construction decision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310671969.0A CN116399732A (en) | 2023-06-08 | 2023-06-08 | Visual test system and method for rapid auxiliary rock breaking through freezing and thawing cold and hot impact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310671969.0A CN116399732A (en) | 2023-06-08 | 2023-06-08 | Visual test system and method for rapid auxiliary rock breaking through freezing and thawing cold and hot impact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116399732A true CN116399732A (en) | 2023-07-07 |
Family
ID=87018421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310671969.0A Pending CN116399732A (en) | 2023-06-08 | 2023-06-08 | Visual test system and method for rapid auxiliary rock breaking through freezing and thawing cold and hot impact |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116399732A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017016168A1 (en) * | 2015-07-24 | 2017-02-02 | 中国矿业大学 | Test system and method for liquid nitrogen circle freeze-thawing permeability-increasing simulation of coal rock sample |
| CN110823757A (en) * | 2019-11-28 | 2020-02-21 | 辽宁工程技术大学 | Low-permeability coal bed gas microwave-liquid nitrogen circulating freeze-thaw degradation-promotion permeability-increasing experimental device and method |
| CN213986264U (en) * | 2020-12-04 | 2021-08-17 | 长沙矿山研究院有限责任公司 | Device for freeze-thaw cycle test under confining pressure condition |
| CN217359685U (en) * | 2022-03-31 | 2022-09-02 | 长安大学 | Damage measuring device for jointed rock sample under freeze thawing and three-way pressure coupling action |
| CN115060599A (en) * | 2022-05-24 | 2022-09-16 | 辽宁科技大学 | Hopkinson pressure bar experiment system and method based on CT scanning and freeze-thaw damage |
| CN115808437A (en) * | 2023-01-17 | 2023-03-17 | 中国建筑第二工程局有限公司 | Subway communication channel freezing method construction model test device and method |
-
2023
- 2023-06-08 CN CN202310671969.0A patent/CN116399732A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017016168A1 (en) * | 2015-07-24 | 2017-02-02 | 中国矿业大学 | Test system and method for liquid nitrogen circle freeze-thawing permeability-increasing simulation of coal rock sample |
| CN110823757A (en) * | 2019-11-28 | 2020-02-21 | 辽宁工程技术大学 | Low-permeability coal bed gas microwave-liquid nitrogen circulating freeze-thaw degradation-promotion permeability-increasing experimental device and method |
| CN213986264U (en) * | 2020-12-04 | 2021-08-17 | 长沙矿山研究院有限责任公司 | Device for freeze-thaw cycle test under confining pressure condition |
| CN217359685U (en) * | 2022-03-31 | 2022-09-02 | 长安大学 | Damage measuring device for jointed rock sample under freeze thawing and three-way pressure coupling action |
| CN115060599A (en) * | 2022-05-24 | 2022-09-16 | 辽宁科技大学 | Hopkinson pressure bar experiment system and method based on CT scanning and freeze-thaw damage |
| CN115808437A (en) * | 2023-01-17 | 2023-03-17 | 中国建筑第二工程局有限公司 | Subway communication channel freezing method construction model test device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kumari et al. | Sustainable development of enhanced geothermal systems based on geotechnical research–A review | |
| CN108868740B (en) | Cave pressure relief mining simulation test method for tectonic coal in-situ coal bed gas horizontal well | |
| CN108572247B (en) | Multi-function deep geothermal energy resources are drilled well experimental provision | |
| CN105114049A (en) | Experimental device for simulating hydrofracture action mechanism in steam assisted gravity drainage (SAGD) process | |
| CN110030745B (en) | Geothermal development system and construction method thereof | |
| CN107764658B (en) | Test device and method for simulating two-dimensional loading liquid nitrogen cooling roadway excavation unloading | |
| CN205154123U (en) | Experimental device for simulation SAGD in -process hydraulic fracturing mechanism | |
| CN113567257A (en) | High-voltage electric pulse rock breaking and fracturing device and method under true triaxial surrounding pressure | |
| CN111946318A (en) | Multi-cluster synchronous fracturing visual simulation device, system and manufacturing method | |
| US20240240548A1 (en) | Self-generating heat process for in-situ conversion of medium-low mature and organic-rich shale | |
| CN114354683A (en) | High/low temperature rock mass enhanced heat transfer and power disturbance test method under multi-field loading | |
| CN116879068A (en) | Shock wave rock breaking experiment method for simulating stratum environment | |
| Zhao et al. | Simulation and experimental research on ultrasonic vibration high temperature rock | |
| CN110782362A (en) | Large-scale three-dimensional simulation method for exploiting super-heavy oil reservoir by SAGD technology | |
| CN116399732A (en) | Visual test system and method for rapid auxiliary rock breaking through freezing and thawing cold and hot impact | |
| CN114646535A (en) | Liquid nitrogen ultralow temperature and phase change cracking effect similar simulation experiment device and experiment method | |
| CN109765117A (en) | A kind of hot dry rock orientation hydraulic fracturing heat exchange simulation test device and test method | |
| CN116427891A (en) | Integrated device and method for exploiting deep shale gas through directional perforation and hydraulic fracturing | |
| CN114720285B (en) | Grouting and water plugging device for broken rock in mine coupling state and test method | |
| CN213903056U (en) | Experimental device for research deep granite microwave is broken | |
| Hu et al. | Experimental research of novel true triaxial hydrothermal phase change impact fracturing | |
| MacDonald et al. | The UK geothermal hot dry rock R&D programme | |
| Li et al. | Development status and research recommendations for thermal extraction technology in deep hot dry rock reservoirs | |
| Pogacnik et al. | Flow Lognormality and Spatial Correlation in Crustal Reservoirs: III—Natural Permeability Enhancement via Biot Fluid-Rock Coupling at All Scales | |
| CN109669001A (en) | Method for selecting fracturing fluid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |