CN115144277B - Coal water injection fracturing test system under multi-position impact load effect - Google Patents
Coal water injection fracturing test system under multi-position impact load effect Download PDFInfo
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- CN115144277B CN115144277B CN202210747014.4A CN202210747014A CN115144277B CN 115144277 B CN115144277 B CN 115144277B CN 202210747014 A CN202210747014 A CN 202210747014A CN 115144277 B CN115144277 B CN 115144277B
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- 238000012360 testing method Methods 0.000 title claims abstract description 157
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- 238000002347 injection Methods 0.000 title claims abstract description 70
- 239000007924 injection Substances 0.000 title claims abstract description 70
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- 230000000694 effects Effects 0.000 title claims abstract description 9
- 230000009471 action Effects 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 238000011161 development Methods 0.000 claims abstract description 17
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- 238000006073 displacement reaction Methods 0.000 claims description 22
- 230000007246 mechanism Effects 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
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- 238000012545 processing Methods 0.000 claims description 3
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- 238000000034 method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
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- 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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
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- 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
- G01N3/02—Details
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- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- 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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
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- 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
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
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- 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
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
- G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
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- 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
- G01N2203/025—Geometry of the test
- G01N2203/0258—Non axial, i.e. the forces not being applied along an axis of symmetry of the specimen
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- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
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- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
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Abstract
The invention discloses a coal water injection fracturing test system under the action of multi-position impact load, which relates to the field of coal seam water injection fracturing evolution test systems, and comprises a test piece box, wherein a test piece is placed in the test piece box, and the system further comprises: the load loading assembly is used for supporting the left, right and top of the test piece and loading the load of the test piece; the pressure cavity assembly is used for providing confining pressure for the test piece; the water injection fracturing component is used for performing water injection fracturing on the test piece; the data monitoring component is used for detecting the impact load of the test piece and the deformation generated in the axial direction of the test piece under the condition of loading load and detecting the crack development influence factors in the test piece under the condition of water injection fracturing. According to the technical scheme, the coal water injection fracturing evolution test under the impact load effect is carried out, various test parameters such as stress, strain, crack development, water flow and the like are collected in real time, and a test basis is provided for revealing the coal seam water injection fracturing evolution rule under the deep impact load effect.
Description
Technical Field
The invention relates to the field of coal seam water injection fracturing evolution test systems, in particular to a coal seam water injection fracturing test system under the action of multi-position impact load.
Background
Rock burst is an environmental geological problem with serious hazard, and coal seam water injection is one of the most widely effective measures for preventing and controlling rock burst disasters. In recent years, the coal seam water injection technology is increasingly widely applied to disaster prevention and control technologies of various large coal mines. Many expert scholars at home and abroad have conducted intensive research on coal seam water injection technology, and have obtained popular results. The research of preventing and controlling rock burst by injecting coal seam mostly surrounds the research of increasing the water content of coal body and changing the mechanical property direction of softened coal body, but along with the increase of the mining depth of coal mine in China, the stress environment of the coal seam is more complex, the coal seam is often subjected to impact load action, and the coal seam presents low permeability phenomenon, so that the research of the coal body injection fracturing evolution process under the impact load action is necessary.
For deep coal seam water injection research, students at home and abroad mainly develop related experiments by means of improving water injection pressure, adding mineral substance dissolvent and the like, and change of internal crack development of the coal seam when the coal seam is subjected to deep impact load in the water injection fracturing process is ignored. Therefore, scientific and reasonable research on crack development characteristics generated by impact load action of the coal seam in the water injection fracturing process is very important for revealing the coal seam water injection fracturing evolution rule under the deep impact load action. The research result is helpful for promoting the perfection of the deep coal seam water injection theory, promoting the development of the deep coal seam water injection technology, and has important significance for deep coal exploitation.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiment of the invention discloses a coal water injection fracturing test system under the action of multi-position impact load. The technical scheme is as follows:
according to a first aspect of the disclosed embodiments of the present invention, there is provided a coal water injection fracturing test system under the action of a multi-position impact load, including a test piece box, in which a test piece is placed, the coal water injection fracturing test system under the action of the multi-position impact load further includes:
the load loading assembly is used for supporting the left, right and top of the test piece and loading the load of the test piece;
The pressure cavity assembly is used for providing confining pressure for the test piece;
The water injection fracturing component is used for performing water injection fracturing on the test piece;
The data monitoring component is used for detecting the impact load of the test piece and the deformation generated in the axial direction of the test piece under the condition of loading load and detecting the crack development influence factors in the test piece under the condition of water injection fracturing.
In one embodiment, the load loading assembly comprises:
The test bed comprises a test bed frame, wherein a test piece box is arranged in the test bed frame;
the side end load loading unit is arranged on one side of the test bed frame;
the top impact load loading unit is arranged at the upper part of the test bed frame;
the side end supporting unit is arranged between the test bed frame and the test piece box and used for providing supporting force for the pressure cavity.
In one embodiment, the pressure chamber assembly comprises:
The lower cavity is arranged on the test bed frame;
the cavity top cover is arranged at the opening of the lower cavity.
In one embodiment, the water flooding fracturing assembly comprises:
The high-pressure water injection pump is arranged at the upper part of one side of the test bed frame;
one end of the seepage channel mechanism is connected with the high-pressure water injection pump, and the other end of the seepage channel mechanism is connected with the inside of the test piece box;
in one embodiment, the test bed further comprises a servo loading mechanism, wherein the servo loading mechanism is arranged at one end of the test bed frame and is connected with the side end load loading unit and the top impact load loading unit; the servo loading mechanism provides confining pressure for the inside of the pressure cavity of the test piece box.
In one embodiment, the data monitoring component comprises:
the sensor module mechanism is used for monitoring the load loading pressure and displacement variation value born by the test bed frame and monitoring the crack development value in the test piece;
The data acquisition and analysis device is connected with the sensor module mechanism and is used for receiving the monitoring data.
According to a first aspect of embodiments of the present disclosure, there is provided a test method applicable to the above-mentioned coal water injection fracturing test system under the action of a multi-position impact load, the test method including the following steps:
Step one: processing a cuboid test piece;
step two: installing the processed test piece into a test piece box, and performing sealing treatment;
step three: the left side load loading unit and the top impact load loading unit are moved to the surface of the test piece through the control system, hydraulic oil is injected into the pressure cavity through the servo loading device, confining pressure is provided for the test piece, meanwhile, the heat shrinkage tube is prevented from being broken through high-pressure water, and after the confining pressure reaches a set value, the high-pressure water is introduced according to a test scheme.
Step four: after the high-pressure water flows stably, impact loads at different positions are applied to a test piece through a top impact load loading unit, and meanwhile various experimental data such as stress, displacement, high-frequency stress, high-frequency displacement, internal crack development, water flow and the like are monitored in real time, and a data chart is generated through a data acquisition and analysis system.
The technical scheme provided by the embodiment of the invention can comprise the following beneficial effects:
The system can be used for controlling the mechanical environment of deep impact load according to the coal body. And carrying out a coal body water injection fracturing evolution test under the impact load effect, and acquiring parameters such as stress, strain, internal fracture quantity, water flow and the like of the coal bed under the impact load effect in real time through a high-frequency pressure sensor, a high-frequency displacement sensor, a displacement sensor, an acoustic emission probe and a flowmeter. The device comprises a servo loading assembly, an impact load assembly, a pressure cavity assembly, a water injection assembly and a monitoring assembly. When the system operates, the pressure cavity is filled with hydraulic oil, confining pressure is provided for the test piece, the left hydraulic oil cylinder can provide axial pressure for the test piece, the high-pressure water injection pump can provide high-pressure water for the test piece, the top three independent impact load pressure heads can simulate impact load born by a coal bed when water injection fracturing, the monitoring component can monitor various parameters in real time, and then the coal body water injection fracturing evolution process under the impact load effect is realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram of a coal water injection fracturing test system under the action of a multi-position impact load;
FIG. 2 is a schematic view of the structure of the test stand frame according to the present invention;
reference numerals:
1. high-pressure water injection pump 2, test bed frame 3 and displacement sensor
4. First hydraulic cylinder 5, pressure sensor 6 and first pressure transmission rod
7. Servo loading device 801, first seal ring 802, second seal ring
803. Third sealing ring 9, test piece box 10 and left pressure head
11. Upper pressure head 12, heat shrinkage tube 13 and test piece
14. Acoustic emission probe 15, seepage connection disk 16 and impact load actuator
17. High-frequency pressure sensor 18, second hydraulic cylinder 19, high-frequency displacement sensor
20. A second pressure transmission rod 21, a flexible diaphragm 22 and a support rod
23. Data acquisition and analysis system 24, right pressure head 201 and left upright post
202. Right side upright 203, bottom loading table 204, top cross-pillar
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
The invention discloses a technical scheme provided by an embodiment of the invention relates to a coal water injection fracturing test system under the action of multi-position impact load, in particular to the field of coal seam water injection fracturing evolution test systems. In the related technology, for deep coal seam water injection research, students at home and abroad mainly develop related experiments by means of improving water injection pressure, adding mineral substance dissolvent and the like, and the change of internal crack development of the coal seam when the coal seam is subjected to deep impact load in the water injection fracturing process is ignored. Based on the above, the coal water injection fracturing test system under the action of the multi-position impact load provided by the technical scheme of the disclosure is used for performing a coal water injection fracturing evolution test under the action of the impact load, collecting various test parameters such as stress, strain, crack development, water flow and the like in real time, and providing a test foundation for revealing the coal seam water injection fracturing evolution rule under the action of the deep impact load.
Fig. 1 is a schematic structural diagram illustrating a coal water injection fracturing test system under the action of multi-position impact load according to the technical scheme disclosed by the invention. As can be seen from fig. 1 to fig. 2, the test piece is placed in the test piece box of the two third sealing rings 803, and the coal water injection fracturing test system under the action of the multi-position impact load further comprises: the load loading assembly is used for supporting the left, right and top of the test piece and loading the load of the test piece; the pressure cavity assembly is used for providing confining pressure for the test piece; the water injection fracturing component is used for performing water injection fracturing on the test piece; the data monitoring component is used for detecting the impact load of the test piece and the deformation generated in the axial direction of the test piece under the condition of loading load and detecting the crack development influence factors in the test piece under the condition of water injection fracturing.
Embodiment one:
The load loading assembly includes:
Test bed frame 2, test piece box 9 is installed to two-layer third sealing washer 803 test bed frame 2, needs to be pointed out further that test bed frame 2 includes bottom plummer 203, left side stand 201 and right side stand 202, top diaphragm 204, wherein:
The two ends of the bottom bearing table 203 are respectively provided with a left upright 201 and a right upright 202, and the two ends of the top transverse column 204 are respectively connected with the upper parts of the left upright 201 and the right upright 202; the left side end load loading unit includes: the first hydraulic cylinder 4 is connected with the first pressure transmission rod 6 of the first hydraulic cylinder 4, the first hydraulic cylinder 4 is positioned on the connecting steel plate 24 in the middle of the left upright 201, and the first hydraulic cylinder 4 is connected with the first pressure transmission rod 6 to provide left lateral pressure for the test piece; the top impact load loading unit includes: the three second hydraulic cylinders 18 are positioned on a connecting steel plate between the top transverse columns 204, three upper pressure heads 11 for loading impact load are arranged, the impact load actuators 16 are coaxially connected with the first hydraulic cylinders, the impact load actuators 16 are sequentially connected with the three upper pressure heads 11 through second pressure transmission rods 18, and the three upper pressure heads are used for providing impact load for a test piece; the side end supporting unit includes: the support rod 22 is positioned between the pressure cavity and the right upright post, and the support rod 22 is respectively connected with the pressure cavity and the right upright post 202 through steel connecting pieces to provide right supporting force for the pressure cavity.
In one embodiment, the lower cavity of the pressure cavity assembly of the two layers of third sealing rings 803 is fixed above the bottom bearing table 201 through a connecting piece, a circular opening is reserved on the left side of the lower cavity, and two layers of first sealing rings 801 are arranged in the opening to ensure the sealing between the opening and the first pressure transmission rod 6 on the left side; a circular opening is reserved on the right side of the lower cavity, two layers of second sealing rings 802 are arranged in the opening, and the sealing between the opening and the right seepage connecting disc 15 is ensured; an oil inlet and return port is reserved at the left lower part of the lower cavity, the oil inlet and return port is connected with the servo loading device 7 through a high-pressure pipe, so as to provide confining pressure for a test piece 13 in the cavity, and further the provision of confining pressure means that the test piece with the heat shrinkage pipe 12 is wrapped by filling high-pressure hydraulic oil, a top cover of the cavity of the test piece 13 with two layers of third sealing rings 803 is connected with the lower cavity through bolts, two layers of sealing rings 801 are arranged in a top cover area of a connecting surface, and two grooves are arranged in a lower cavity area of the connecting surface so as to ensure the sealing of the cavity; three circular openings are reserved on the cavity top cover, and two layers of third sealing rings 803 are arranged in each opening to ensure the sealing between the cavity top cover and the three second pressure transmission rods 20; a water filling port is reserved on the top cover of the cavity, and the water filling port is connected with a high-pressure water injection pump 1 through a high-pressure pipe to provide high-pressure water for a test piece 13; the flexible diaphragm 21 is installed to cavity top cap lower part, avoids going up pressure head 11 and test piece 13 direct contact and causes the damage of test piece pyrocondensation pipe.
In one embodiment, the two-layer third seal 803 water flooding fracturing assembly comprises:
a high-pressure water injection pump 1, wherein the high-pressure water injection pump 1 with two layers of third sealing rings 803 is arranged at the upper part of one side of the test bed frame 2;
the seepage channel mechanism comprises: the high-pressure pipeline, the left pressure head 10, the test piece 13, the heat shrinkage tube 12, the right pressure head 24, the seepage connecting disc 15 and the flowmeter 20, the two-layer third sealing ring 803 water injection fracturing component is sequentially connected with the high-pressure water injection pump 1, the high-pressure pipeline, the left pressure head 10, the test piece 13, the right pressure head 24, the seepage connecting disc 15 and the flowmeter 20 through sealing components, and high-pressure water is provided for the test piece through a seepage channel of the seepage connecting disc 15, wherein the test piece is connected with the left pressure head and the right pressure head into a whole through silicone rubber and sealing hoops.
In one embodiment, the two-layer third seal 803 servo loading device powers the left load cell, the top impact load cell, and provides a confining pressure to the pressure chamber interior.
In one embodiment, the two-layer third seal 803 data monitoring assembly includes:
The sensor module mechanism includes: the pressure sensor 5, the displacement sensor 3, the high-frequency pressure sensor 17 and the high-frequency displacement sensor 19, wherein the pressure sensor 5 and the displacement sensor 3 of the two layers of third sealing rings 803 are positioned on the left load loading unit and used for monitoring the pressure and displacement change value of the left load loading unit so as to reflect the left pressure and the lateral deformation of the test piece. The high-frequency pressure sensor 17 and the high-frequency displacement sensor 19 of the two layers of third sealing rings 803 are positioned on the top impact load loading unit and are used for monitoring the pressure and the displacement high-frequency change value of the top impact load loading unit so as to reflect the impact load size of the test piece and the deformation generated in the axial direction of the test piece;
The sensor module mechanism further includes: the acoustic emission probe 14 of the two layers of third sealing rings 803 is positioned at the bottom of the lower cavity and is used for monitoring the development value of the crack inside the test piece. The two-layer third sealing ring 803 is used for monitoring the high-pressure water flow rate of the flow passing through the test piece and reflecting the crack development condition in the test piece.
The data acquisition and analysis device 23, the data acquisition and analysis system 23 is connected with the output ends of the pressure sensor 5, the displacement sensor 3, the high-frequency pressure sensor 17, the high-frequency displacement sensor 19, the acoustic emission probe 14 and the flowmeter 20, and is used for collecting data values acquired by the pressure sensor, the displacement sensor, the high-frequency pressure sensor, the high-frequency displacement sensor, the acoustic emission probe and the flowmeter, and carrying out relevant analysis on the data through acquisition and analysis software to form a chart.
Embodiment two: the test method suitable for the coal water injection fracturing test system under the action of the multi-position impact load comprises the following steps:
Step one: processing a cuboid test piece, firstly collecting a large coal sample from a coal mine, then wrapping and curing the coal sample, conveying the coal sample to a sampling center, avoiding damage to the coal body during conveying, and cutting the test piece into a cuboid test piece with 200mm multiplied by 600mm by digital cutting equipment.
Step two: and installing the processed test piece in the test piece box between the left pressure head and the right pressure head, erecting and arranging, uniformly smearing sealant on the side surfaces of the test piece, the left pressure head and the right pressure head, and wrapping the left pressure head, the test piece and the right pressure head into a whole by using a heat shrinkage tube after the sealant is dried, and fixing by using a sealing hoop to ensure perfect tightness.
Step three: the left side load loading unit and the top impact load loading unit are moved to the surface of the test piece through the control system, hydraulic oil is injected into the pressure cavity through the servo loading device, confining pressure is provided for the test piece, meanwhile, the heat shrinkage tube is prevented from being broken through high-pressure water, and after the confining pressure reaches a set value, the high-pressure water is introduced according to a test scheme.
Step four: after the high-pressure water flows stably, impact loads at different positions are applied to a test piece through a top impact load loading unit, and meanwhile various experimental data such as stress, displacement, high-frequency stress, high-frequency displacement, internal crack development, water flow and the like are monitored in real time, and a data chart is generated through a data acquisition and analysis system.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure should be limited by the attached claims.
Claims (6)
1. The utility model provides a coal body water injection fracturing test system under multiposition impact load effect, includes the test piece box, place the test piece in the test piece box, its characterized in that, this coal body water injection fracturing test system still includes under multiposition impact load effect:
the load loading assembly is used for supporting the left, right and top of the test piece and loading the load of the test piece;
The pressure cavity assembly is used for providing confining pressure for the test piece;
The water injection fracturing component is used for performing water injection fracturing on the test piece;
the data monitoring component is used for detecting the impact load size of the test piece and the deformation generated in the axial direction of the test piece under the condition of loading load and detecting the crack development influence factors in the test piece under the condition of water injection fracturing;
the load loading assembly includes:
a test bed frame (2) in which a test piece box is installed;
The left side end load loading unit is arranged on one side of the test bed frame;
the top impact load loading unit is arranged at the upper part of the test bed frame;
The side end supporting unit is arranged between the test bed frame and the test piece box and is used for providing supporting force for the pressure cavity of the test piece box;
Test bench frame (2) including bottom plummer (203), left side stand (201) and right side stand (202), top diaphragm (204), wherein:
The two ends of the bottom bearing table (203) are respectively provided with a left upright post (201) and a right upright post (202), and the two ends of the top transverse post (204) are respectively connected with the upper parts of the left upright post (201) and the right upright post (202); the left side end load loading unit includes: the first hydraulic cylinder (4) is connected with a first pressure transmission rod (6) connected with the first hydraulic cylinder (4), the first hydraulic cylinder (4) is positioned on a connecting steel plate (24) in the middle of the left upright post (201), and the first hydraulic cylinder (4) is connected with the first pressure transmission rod (6) to provide left lateral pressure for a test piece; the top impact load loading unit includes: the three second hydraulic cylinders (18), the three second hydraulic cylinders (18) are positioned on a connecting steel plate between the top transverse columns (204), three upper pressure heads (11) for loading impact load are arranged, the impact load actuators (16) are coaxially connected with the first hydraulic cylinders, the impact load actuators (16) are connected with the three upper pressure heads (11) sequentially through second pressure transmission rods (20), and the three upper pressure heads are utilized to provide impact load for a test piece; the side end supporting unit includes: the support rod (22) is positioned between the pressure cavity and the right upright post, and the support rod (22) is respectively connected with the pressure cavity and the right upright post (202) through steel connecting pieces to provide right supporting force for the pressure cavity.
2. The multi-position impact load coal water injection fracturing test system of claim 1, wherein said pressure chamber assembly comprises:
The lower cavity is arranged on the test bed frame;
the cavity top cover is arranged at the opening of the lower cavity.
3. The multi-position impact load coal water injection fracturing test system of claim 1, wherein said water injection fracturing assembly comprises:
The high-pressure water injection pump is arranged at the upper part of one side of the test bed frame;
and one end of the seepage channel mechanism is connected with the high-pressure water injection pump, and the other end of the seepage channel mechanism is connected with the inside of the test piece box.
4. The multi-position impact load coal water injection fracturing test system according to claim 1, further comprising a servo loading mechanism, wherein the servo loading mechanism is arranged at one end of the test bed frame, is connected with the side load loading unit and the top impact load loading unit, and is used for providing confining pressure for the inside of the pressure cavity of the test piece box.
5. A coal water injection fracturing test system under the action of a multi-position impact load according to claim 3, wherein said data monitoring assembly comprises:
the sensor module mechanism is used for monitoring the load loading pressure and displacement variation value born by the test bed frame and monitoring the crack development value in the test piece;
The data acquisition and analysis device is connected with the sensor module mechanism and is used for receiving the monitoring data.
6. A test method using the coal water injection fracturing test system under the action of multi-position impact load according to any one of claims 1 to 5, which is characterized by comprising the following steps:
Step one: processing a cuboid test piece;
step two: installing the processed test piece into a test piece box, and performing sealing treatment;
Step three: the left load loading unit and the top impact load loading unit are moved to the surface of the test piece through the control system, hydraulic oil is injected into the pressure cavity through the servo loading device, confining pressure is provided for the test piece, meanwhile, the heat shrinkage pipe is prevented from being broken through high-pressure water, and after the confining pressure reaches a set value, the high-pressure water is introduced according to a test scheme;
Step four: after the high-pressure water flows stably, impact loads at different positions are applied to a test piece through a top impact load loading unit, and meanwhile, various experimental data including stress, displacement, high-frequency stress, high-frequency displacement, internal crack development and water flow are monitored in real time, and a data chart is generated through a data acquisition and analysis system.
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| CN104614497A (en) * | 2015-03-09 | 2015-05-13 | 中国矿业大学 | True-triaxial integrated experimental system for fracturing due to flowing pressure, slotting, seepage and gas driving |
| CN109386270A (en) * | 2018-11-21 | 2019-02-26 | 山东大学 | Coal rock layer mash gas dynamic is anti-reflection seepage flow and displacement simulation pilot system and test method |
| WO2019223389A1 (en) * | 2018-12-24 | 2019-11-28 | 山东科技大学 | Tunnel surrounding rock support strength test apparatus and strength determination method |
| CN110702507A (en) * | 2019-08-28 | 2020-01-17 | 西安科技大学 | Real-time monitoring coal body deformation test system based on stress load |
| CN111198128A (en) * | 2020-03-09 | 2020-05-26 | 山东科技大学 | Integrated into one piece totally enclosed true triaxial test testing arrangement |
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| CN104614497A (en) * | 2015-03-09 | 2015-05-13 | 中国矿业大学 | True-triaxial integrated experimental system for fracturing due to flowing pressure, slotting, seepage and gas driving |
| CN109386270A (en) * | 2018-11-21 | 2019-02-26 | 山东大学 | Coal rock layer mash gas dynamic is anti-reflection seepage flow and displacement simulation pilot system and test method |
| WO2019223389A1 (en) * | 2018-12-24 | 2019-11-28 | 山东科技大学 | Tunnel surrounding rock support strength test apparatus and strength determination method |
| CN110702507A (en) * | 2019-08-28 | 2020-01-17 | 西安科技大学 | Real-time monitoring coal body deformation test system based on stress load |
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