CN109001053B - Coal rock dynamic impact damage test system under confining pressure and damp-heat coupling condition - Google Patents
Coal rock dynamic impact damage test system under confining pressure and damp-heat coupling condition Download PDFInfo
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- CN109001053B CN109001053B CN201810607313.1A CN201810607313A CN109001053B CN 109001053 B CN109001053 B CN 109001053B CN 201810607313 A CN201810607313 A CN 201810607313A CN 109001053 B CN109001053 B CN 109001053B
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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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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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
Abstract
The invention discloses a coal rock dynamic impact failure testing system under the condition of coupling ambient pressure and damp-heat, relates to the technical field of coal rock dynamic failure tests, and can realize dynamic impact loading of coal rock under the conditions of high ambient pressure, high damp-heat and strong dynamic disturbance. The system consists of an impact loading device and a wet-heat force coupling device, wherein the impact loading device applies strong power disturbance to a coal-rock sample, and the wet-heat force coupling device forms humidity, temperature and confining pressure conditions required by testing the sample. In the impact loading process, the internal micro-fracture signal and the surface fracture image information of the sample can be obtained in real time, the dynamic response characteristics of the coal rock mass under the conditions of high confining pressure, high moist heat and strong dynamic disturbance are analyzed, and the method has important theoretical significance and practical value for prediction and control of dynamic disasters in deep underground spaces.
Description
Technical Field
The invention relates to the technical field of coal rock dynamic damage tests, in particular to a coal rock dynamic impact damage testing system under the condition of coupling ambient pressure and damp-heat.
Background
With the rapid development of global economy, the scale and depth of underground engineering in the industries of national defense, traffic, water conservancy, mining and the like are rapidly increased, and the utilization of deep underground space and the development of mineral resources gradually become the key research fields of various countries. At present, most of coal resources in China begin to extend to the deep part, coal rock bodies in deep underground spaces are often in environments with high ambient pressure, high damp heat and strong power disturbance, dynamic disasters such as rock burst and rock burst are very easy to occur in the deep part development process, and the life and property safety of people is seriously threatened.
Currently, people still lack sufficient knowledge of coal and rock mass dynamic response under high confining pressure, high humid heat and strong dynamic disturbance environment, so that effective prediction and control of dynamic disasters of deep underground space are difficult to carry out. The system for testing the dynamic impact damage of the coal rock under the coupling condition of the confining pressure and the damp-heat is developed, is used for analyzing the dynamic response characteristics of the coal rock under the coupling condition of the deep confining pressure and the damp-heat, and has important theoretical significance and practical value for prediction and control of dynamic disasters in deep underground spaces.
At present, current coal petrography dynamic impact destroys test system mainly is based on disconnect-type hopkinson depression bar device realizes, and confined pressure device in this type of system adopts hydraulic power unit mostly to pour into airtight cavity with oil or water, acts on pressure around the sample through sealed gum cover, and this kind of processing mode has following shortcoming:
1. because the time of the Hopkinson pressure bar test can be completed within a few ms, the action process is finished instantly, if a hydraulic mode is adopted, the hydraulic servo actuation time is too long, so that the confining pressure and the impact load are difficult to load synchronously, and the large deformation of the material can cause the volume change of hydraulic oil in the confining pressure device during the test, so that the confining pressure device is difficult to maintain the stable pressure in the test process.
2. Because the sample is encapsulated in the sealing sleeve, the internal micro-fracture signal and the surface fracture image information of the sample in the impact damage process can not be directly acquired, and people are hindered from comprehensively knowing the coal-rock mass dynamic response characteristics.
3. The existing coal rock dynamic impact damage testing system cannot simulate a damp and hot environment and can not be used for researching coal rock body dynamic response under the coupling action of ambient pressure and damp and hot.
Disclosure of Invention
Solves the technical problem
The invention aims to provide a coal rock dynamic impact damage testing system under the condition of coupling of ambient pressure and damp-heat, which can realize dynamic impact damage of coal rock under the condition of coupling of ambient pressure and damp-heat, can acquire micro-fracture signals and surface fracture image information in a sample in real time in the impact damage process, and truly reflects dynamic response characteristics of the coal rock under the conditions of deep high ambient pressure, high damp-heat and strong dynamic disturbance.
Technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention comprises an impact loading device and a wet-heat power coupling device; the impact loading device with damp and hot power coupling device is located the same axis, impact loading device is pneumatic control, damp and hot power coupling device external supercharging device, dynamic monitoring device, the damp and hot power coupling device has installed the sample in, just damp and hot power coupling device with sample direct contact.
Further, the impact loading device comprises an air chamber, a control valve, a striker rod, an incident rod and a transmission rod; the control valve in the impact loading device is used for controlling the opening and closing states of the air chamber pipeline, the impact rod is located in the air chamber pipeline, and the impact rod, the incident rod and the transmission rod are located on the same axis.
Further, the wet and thermal force coupling loading device comprises an incident rod sleeve, an incident end chamber, a transmission end chamber and a transmission rod sleeve; the incident rod, the incident rod sleeve and the incident end cavity are hermetically sleeved layer by layer from inside to outside; the transmission rod, the transmission rod sleeve and the transmission end cavity are hermetically sleeved layer by layer from inside to outside; the sample is clamped between the incident rod and the transmission rod, the incident end cavity and the transmission end cavity are connected through a normal bolt, and rigid bases are fixed below the incident end cavity and the transmission end cavity.
Further, supercharging device includes hydraulic power unit, dynamic monitoring device includes pressure sensor, high-pressure gas cylinder, acoustic emission sensor, resistance heating formula coil pipe, temperature sensor, humidity transducer, acoustic emission collection appearance, dynamic data acquisition appearance, industry control computer and high-speed camera.
Furthermore, annular bulges are respectively arranged on the surfaces of the whole bodies of the incident rod sleeve and the transmission rod sleeve, and the two annular bulges respectively form a closed space with the incident end cavity and the transmission end cavity;
oil inlets are formed in the wall surfaces of the incident end cavity and the transmission rod cavity in the closed space.
The incident end cavity contains 1 oil inlet, 1 air inlet and 1 pressure release mouth, the oil inlet pass through high-pressure line with hydraulic power unit connects, the air inlet pass through high-pressure line with pressure sensor with the high-pressure gas cylinder is connected, pressure sensor with the dynamic data acquisition appearance is connected, the pressure release mouth is connected the relief valve, when pressure surpassed the safety threshold value the relief valve is automatic to be opened the release.
A transparent observation window is arranged at the position of the incident end cavity, which is opposite to the sample, the transparent observation window is sealed by high-strength glass, and the high-speed camera is arranged outside the transparent observation window; the transmission end cavity comprises 1 oil inlet, and the oil inlet is connected with the hydraulic pump station through a high-pressure pipeline.
Further, the incident rod sleeve and the incident rod coaxially penetrate through the incident end cavity, and the incident rod sleeve and the end face of the incident rod are in contact with the sample. And a plurality of wire channels a are distributed in the incident rod sleeve at intervals of 90 degrees along the axial direction, the number of the wire channels a is 4, the wire channels a are in contact with the end surface of the sample, and the acoustic emission sensors are uniformly distributed on the end surface of the wire channels a opposite to the sample.
The acoustic emission sensor is characterized in that an elastic buffer cushion block is arranged at the bottom of the acoustic emission sensor, and a wire of the acoustic emission sensor penetrates through the elastic buffer cushion block, penetrates out of the incident rod sleeve through a wire channel a and is connected into the acoustic emission collector.
Further, the transmission rod sleeve and the transmission rod coaxially penetrate through the transmission end chamber, and the end faces of the transmission rod sleeve and the transmission rod are in contact with the sample. And 1 liquid channel and 1 wire channel b are axially arranged in the transmission rod sleeve, one end of the liquid channel is in contact with the end face of the sample, and the other end of the liquid channel is connected with a water injection pump station.
The end part of the side surface of the transmission rod sleeve opposite to the sample is provided with the resistance heating type coil, the surface of the transmission rod sleeve is distributed with the temperature sensor and the humidity sensor, the resistance heating type coil is connected into the industrial control computer through a wire channel b, and wires of the temperature sensor and the humidity sensor are both connected into the dynamic data acquisition instrument through the wire channel b.
Furthermore, the dynamic data acquisition instrument, the acoustic emission acquisition instrument and the high-speed camera are connected through leads, the dynamic data acquisition instrument starts to acquire and output TTL level signals according to the change of strain signals in the incident rod, and the acoustic emission acquisition instrument and the high-speed camera start to acquire after receiving the TTL level signals.
Advantageous effects
Compared with the known public technology, the technical scheme provided by the invention has the following advantages
Has the advantages that:
according to the invention, the confining pressure device is changed from hydraulic pressure to air pressure to directly act on the periphery of the sample, so that the air pressure impact loading speed is high, the confining pressure stability is improved, the blocking of the sample by the sealing rubber sleeve is avoided, the internal micro-fracture signal and the surface fracture image information of the sample in the impact damage process can be directly acquired through the acoustic emission and the high-speed camera, and the dynamic response characteristics of the coal rock mass are more comprehensively reflected. On the other hand, the invention provides an experimental method for impact loading under the coupling effect of the ambient pressure and the damp-heat, which can more truly simulate the high ambient pressure, the high damp-heat and the strong dynamic disturbance environment of the coal-rock mass in the deep underground space, has important value for researching the dynamic disaster prediction and control mechanism of the deep underground space, provides an important way for comprehensively researching the dynamic response of the coal-rock mass, and has important theoretical significance and practical value for improving the technical level of the dynamic disaster prediction and control of the deep underground space.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a schematic perspective view of the present invention;
FIG. 3 is a perspective view of an incident rod sleeve according to the present invention;
FIG. 4 is a schematic perspective view of a transmission rod cover according to the present invention;
the reference numerals in the drawings denote: 1-air chamber; 2-a control valve; 3-a striker bar; 4-an incident rod; 5-an incident rod sleeve; 6-incident end chamber; 7-a transmission-end chamber; 8-a transmission rod sleeve; 9-a transmission rod; 10-a rigid base; 11-sample; 12-ring seal ring; 13-normal bolt; 14-a radial bolt; 15-annular protrusion; 16-an enclosed space; 17-an oil inlet; 18-an air inlet; 19-a pressure relief port; 20 a-a wire channel; 20 b-wire channel b; 21-a liquid channel; 22-a hydraulic pump station; 23-a pressure relief valve; 24-a pressure sensor; 25-high pressure gas cylinder; 26-an acoustic emission sensor; 27-elastic cushion blocks; 28-resistance heating coil; 29-water injection pump station; 30-a temperature sensor; 31-a humidity sensor; 32-acoustic emission collector; 33-dynamic data acquisition instrument; 34-industrial control computer; 35-a transparent viewing window; 36-high speed camera.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the following examples.
Example 1
With reference to fig. 1-4: a coal rock dynamic impact damage test system under the condition of coupling ambient pressure and damp and heat comprises an impact loading device and a damp and heat coupling device; impact loading device with damp and hot power coupling device is located the same axis, and impact loading device is pneumatic control, external supercharging device, dynamic monitoring device of damp and hot power coupling device have installed sample 11 in the damp and hot power coupling device, and damp and hot power coupling device and 11 direct contact of sample.
The impact loading device comprises an air chamber 1, a control valve 2, a striking rod 3, an incident rod 4 and a transmission rod 9; the control valve 2 in the impact loading device is used for controlling the opening and closing states of a pipeline of the air chamber 1, the impact rod 3 is located in the pipeline of the air chamber 1, and the impact rod 3, the incident rod 4 and the transmission rod 9 are located on the same axis. After the control valve 2 opens the air chamber 1, high-pressure gas rushes out from the air chamber 1 to push the impact rod 3 to impact the incident rod 4 at a high speed to form dynamic impact load.
The damp and hot force coupling loading device comprises an incident rod sleeve 5, an incident end chamber 6, a transmission end chamber 7 and a transmission rod sleeve 8; the incident rod 4, the incident rod sleeve 5 and the incident end cavity 6 are hermetically sleeved layer by layer from inside to outside; the transmission rod 9, the transmission rod sleeve 8 and the transmission end cavity 7 are hermetically sleeved layer by layer from inside to outside; a sample 11 is held between the incident rod 4 and the transmission rod 9.
The incident end cavity 6 and the transmission end cavity 7 are coaxial and connected through a normal bolt 13, and a rigid base 10 is fixed below the incident end cavity 6 and the transmission end cavity 7. And two annular sealing rings 12 are arranged at the contact surface of the incident end cavity 6 and the transmission end cavity 7, and the outer parts of the annular sealing rings 12 are fixedly connected through a normal bolt 13.
The supercharging device comprises a hydraulic pump station 22, and the dynamic monitoring device comprises a pressure sensor 24, a high-pressure gas cylinder 25, an acoustic emission sensor 26, a resistance heating type coil 28, a temperature sensor 30, a humidity sensor 31, an acoustic emission collector 32, a dynamic data collector 33, an industrial personal computer 34 and a high-speed camera 36.
The incident end cavity 6 penetrates through the incident rod sleeve 5 along the axis, the incident rod sleeve 5 and the incident rod 4 are coaxial and fixed through a radial bolt 14, and the incident rod sleeve 5 in the incident end cavity 6 is parallel to the end face of the incident rod 4; an annular bulge 15 is arranged on the surface of the whole body of the incident rod sleeve 5 in the incident end cavity 6, the annular bulge 15 is in contact with the inner wall of the incident end cavity 6, two annular sealing rings 12 are arranged on the surface of the annular bulge 15, and two annular sealing rings 12 are arranged on the contact part of the end surface of the incident end cavity 6 and the incident rod sleeve 5; the annular projection 15 forms an enclosed space 16 with the incident end chamber 6.
An oil inlet 17 is arranged on the circumferential wall surface of the incident end cavity 6 in the closed space 16, and the oil inlet 17 is connected with a hydraulic pump station 22; an air inlet 18 and a pressure relief port 19 are arranged in the middle of the wall surface of the incident end chamber 6, the air inlet 18 is sequentially connected with a pressure sensor 24 and a high-pressure gas cylinder 25, the pressure sensor 24 is connected with a dynamic data acquisition instrument 33, the pressure relief port 19 is provided with a pressure relief valve 23, and the pressure relief valve 23 is automatically opened to relieve pressure after the pressure in the incident end chamber 6 exceeds a safety pressure threshold value; a rectangular transparent observation window 35 is arranged in the middle of the wall surface of the incident end cavity 6 opposite to the sample 11, the transparent observation window 35 is covered by high-strength glass, and a high-speed camera 36 is arranged in the normal direction of the transparent observation window 35 and used for collecting crack propagation information in the impact fracture process of the sample 11.
4 circular lead channels a20a are arranged in the incident rod sleeve 5 at intervals of 90 degrees along the axial direction, the lead channels a20a penetrate through the incident rod sleeve 5a and form a cylindrical hole at the end for placing an acoustic emission sensor 26, and the acoustic emission sensor 26 is contacted with the incident rod sleeve 5 through a disc-shaped elastic buffer cushion block 27; the lead of the acoustic emission sensor 26 passes through the elastic cushion block 27, passes through the lead channel a20a, and then passes out of the incident rod sleeve 5, and is connected to the acoustic emission collector 32.
The transmission end cavity 7 penetrates through the transmission rod sleeve 8 along the axis, the transmission rod sleeve 8 and the transmission rod 9 are coaxial and fixed through a radial bolt 14, and the transmission rod sleeve 8 is parallel to the end face of the transmission rod 9 in the transmission end cavity 7; an annular bulge 15 is sleeved on the whole body of the transmission rod 9 in the transmission end cavity 7, the annular bulge 15 is contacted with the inner wall of the transmission end cavity 7, two annular sealing rings 12 are arranged in the contact surface of the annular bulge 15, and two annular sealing rings 12 are arranged at the contact part of the end surface of the transmission end cavity 7 and the transmission rod sleeve 8; the annular bulge 15 and the transmission end cavity 7 form a closed space 16, an oil inlet 17 is arranged on the annular wall surface of the transmission end cavity 7 in the closed space 16, and the oil inlet 17 is connected with a hydraulic pump station 22.
The transmission rod sleeve 8 is internally provided with 1 wire channel b20b and 1 liquid channel 21 along the axial direction, the contact surface of the transmission rod sleeve 8 and the test sample 11 is annularly provided with two grooves, a high-voltage resistant resistance heating type coil 28 is arranged in each groove, a wire of the resistance heating type coil 28 penetrates out of the transmission rod sleeve 8 through a wire channel b20b to be connected with an industrial control computer 34, and the heating rate of the resistance heating type coil 28 is controlled by the industrial control computer 34; the liquid channel 21 is communicated with the sample 11 and a water injection pump station 29, and the humidity condition in the incident end cavity 6 is controlled through the water injection pump station 29; two annular holes are formed in the surface of the transmission rod sleeve 8, the bottoms of the annular holes are communicated with a wire channel b20b, a high-pressure and humidity resistant temperature sensor 30 and a high-temperature and high-pressure resistant humidity sensor 31 are respectively arranged in the two annular holes, and wires of the temperature sensor 30 and the humidity sensor 31 penetrate out of the transmission rod sleeve 8 through a wire channel b20b and are connected with a dynamic data acquisition instrument 33.
The test system can theoretically realize the maximum confining pressure of 20MPa, the maximum impact load of 400MPa, the duration time of the impact load of 400us, the maximum temperature of 100 ℃ and the maximum relative humidity of 80%.
The following description of the operation steps of the specific working principle of the test system of the present invention with reference to sample 11 is as follows:
1. sample 11 is the cylindric structure that the core was made for the coal rock body that awaits measuring, and the diameter is 50mm, and length range 25 ~ 50mm to polish each surface of sample 11 and level and smooth, both ends face unevenness is less than 0.02mm, and the equal perpendicular to axis of terminal surface, maximum deviation is not more than 0.25. Opening the incident end chamber 6 and the transmission end chamber 7, smearing lubricating grease on two end faces of the sample 11, placing the sample between the incident rod 4 and the transmission rod 9, and stably clamping the sample.
2. And (3) butting and closing the incident end cavity 6 and the transmission end cavity 7, screwing the radial bolt 14, opening a hydraulic pump station 22 connected with oil inlets 17 of the incident end cavity 6 and the transmission end cavity 7, and injecting hydraulic oil into the closed space 16. The hydraulic oil acts on the annular bulges 15 of the incident rod sleeve 5 and the transmission rod sleeve 8 to drive the incident rod 4 and the transmission rod 9 to move towards the center of the cavity, and 1MPa initial axial clamping stress is formed on the sample 11.
3. The air inlet 18 of the incident end chamber 6 is opened, 1MPa of nitrogen is filled into the closed space 16, and then the air inlet 18 is closed. And (3) standing the cavity 6 at the incident end for 2h, observing whether the reading of the pressure sensor 24 in the cavity 6 at the incident end changes, if not, proving that the cavity 6 at the incident end has good tightness, and performing the next operation, otherwise, checking whether the annular sealing rings 12 at the joints of the cavity 6 at the incident end are normally connected.
4. The inlet 18 of the incident end chamber 6 is opened again, and the inlet 18 is closed after the enclosed space 16 is filled with nitrogen gas to 5 MPa. The high-pressure nitrogen forms hoop stress on the sample 11, the confining pressure is 5MPa, and the threshold value for releasing pressure by the pressure release valve 23 is set to be 5 MPa. The pressure sensor 24 monitors the change of the gas pressure inside the incident end cavity 6 in real time, and the gas confining pressure is kept stable for 2 h.
5. And (3) starting a water injection pump station 29 to inject liquid water into the transmission end chamber 7 through the liquid channel 21, controlling the resistance heating type coil 28 to start heating by using a computer, monitoring the temperature and humidity change in the transmission end chamber 7 in real time through a temperature sensor 30 and a humidity sensor 31, and closing the water injection pump station 29 and resistance heating until the temperature and humidity reach the conditions required by the test.
6. The control valve 2 of the air chamber 1 is opened, high-pressure gas in the air chamber 1 rapidly pushes the impact rod 3 to rush out from the air pipe, the impact incident rod 4 is collided to form impact stress, the impact stress is transmitted in the incident rod 4 and then acts on the sample 11, dynamic impact loading is formed on the sample 11, and the sample 11 is damaged in the impact loading process. In the dynamic impact loading process, the gas confining pressure in the incident end cavity 6 is rapidly increased due to the movement of the incident rod 4, and after the pressure exceeds the pressure relief threshold value by 5MPa, the pressure relief valve 23 is automatically opened to relieve the pressure, so that the gas confining pressure in the cavity is kept to be 5MPa all the time, and the synchronous loading of the impact stress and the confining pressure is realized.
7. In the dynamic fracture process of the sample 11, a micro-fracture signal is generated inside the sample 11, and a macro-fracture crack is generated on the surface of the sample 11. The micro-crack signal is received by the acoustic emission sensor 26 at the end of the incident rod sleeve 5 and is transmitted to the acoustic emission collector 32 through the wire channel a20a, and the macro-fracture cracks on the surface of the sample 11 are collected and stored by the high-speed camera 36 outside the transparent observation window 35. Finally, the internal micro-fracture signal and the surface fracture image information of the impact fracture of the sample 11 under the coupling condition of confining pressure and damp and heat are obtained by the invention.
According to the invention, the confining pressure device is changed from hydraulic pressure to air pressure to directly act on the periphery of the sample, so that the air pressure impact loading speed is high, the confining pressure stability is improved, the blocking of the sample by the sealing rubber sleeve is avoided, the internal micro-fracture signal and the surface fracture image information of the sample in the impact damage process can be directly acquired through the acoustic emission and the high-speed camera, and the dynamic response characteristics of the coal rock mass are more comprehensively reflected. On the other hand, the invention provides an experimental method for impact loading under the coupling effect of the ambient pressure and the damp-heat, which can more truly simulate the high ambient pressure, the high damp-heat and the strong dynamic disturbance environment of the coal-rock mass in the deep underground space, has important value for researching the dynamic disaster prediction and control mechanism of the deep underground space, provides an important way for comprehensively researching the dynamic response of the coal-rock mass, and has important theoretical significance and practical value for improving the technical level of the dynamic disaster prediction and control of the deep underground space.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not exhaustive or limiting of the specific embodiments of the invention. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (2)
1. The utility model provides a coal petrography dynamic impact destroys test system under confined pressure and damp and hot coupling condition which characterized in that: the device comprises an impact loading device and a wet thermal coupling device; the impact loading device and the wet-heat coupling device are positioned on the same axis, the impact loading device is pneumatically controlled, the wet-heat coupling device is externally connected with a supercharging device and a dynamic monitoring device, a test sample (11) is arranged in the wet-heat coupling device, the wet-heat coupling device is directly contacted with the test sample (11), air pressure confining pressure is directly acted on the periphery of the test sample, the separation of a sealing rubber sleeve on the test sample is avoided, an internal micro-fracture signal and surface fracture image information of the test sample in the impact damage process are directly obtained through an acoustic emission and high-speed camera, and the dynamic response characteristics of the coal rock mass are comprehensively reflected;
the impact loading device comprises an air chamber (1), a control valve (2), a striking rod (3), an incident rod (4) and a transmission rod (9);
the control valve (2) controls the opening and closing state of the air chamber (1), the impact rod (3) is positioned in the air chamber (1), and the impact rod (3), the incident rod (4) and the transmission rod (9) are positioned on the same axis;
the damp and hot force coupling loading device comprises an incident rod sleeve (5), an incident end chamber (6), a transmission end chamber (7) and a transmission rod sleeve (8);
the incident rod (4), the incident rod sleeve (5) and the incident end cavity (6) are hermetically sleeved layer by layer from inside to outside; the transmission rod (9), the transmission rod sleeve (8) and the transmission end cavity (7) are hermetically sleeved layer by layer from inside to outside;
the sample (11) is clamped between the incident rod (4) and the transmission rod (9), and the incident end chamber (6) and the transmission end chamber (7) are connected through a normal bolt (13);
the boosting device comprises a hydraulic pump station (22);
the circumferential surfaces of the incident rod sleeve (5) and the transmission rod sleeve (8) are respectively provided with an annular bulge (15), and the two annular bulges (15) respectively form a closed space (16) with the incident end cavity (6) and the transmission end cavity (7);
oil inlets (17) are formed in the wall surfaces of the incident end cavity (6) and the transmission rod cavity (7) in the closed space (16), the oil inlets (17) are connected with a hydraulic pump station (22) through a high-pressure pipeline, and hydraulic oil is injected into the closed space (16) by the hydraulic pump station (22);
the dynamic monitoring device comprises a pressure sensor (24), a high-pressure gas cylinder (25) and a dynamic data acquisition instrument (33);
an air inlet (18) and a pressure relief opening (19) are formed in the middle of the wall surface of the incident end cavity (6), and a pressure relief valve (23) is connected to the pressure relief opening (19);
the gas inlet (18) is sequentially connected with the pressure sensor (24) and the high-pressure gas cylinder (25), and the pressure sensor (24) is connected with the dynamic data acquisition instrument (33);
the high-pressure gas bottle (25) injects high-pressure gas into the incident end chamber (6) through the gas inlet (18), and the high-pressure gas exerts circumferential confining pressure on the sample (11);
the dynamic monitoring device comprises an acoustic emission sensor (26) and an acoustic emission collector (32);
a plurality of wire channels a (20a) are uniformly distributed in the incident rod sleeve (5) at intervals of 90 degrees along the axial direction, and the acoustic emission sensors (26) are uniformly distributed on the end face of the incident rod sleeve (5) opposite to the sample (11);
an elastic buffer cushion block (27) is arranged at the bottom of the acoustic emission sensor (26), and a lead of the acoustic emission sensor (26) penetrates through the elastic buffer cushion block (27) and penetrates out of the incident rod sleeve (5) through the lead channel a (20a) to be connected with the acoustic emission collector (32);
the dynamic monitoring device also comprises a resistance heating type coil (28), a temperature sensor (30), a humidity sensor (31) and an industrial control computer (34);
a liquid channel (21) and a lead channel b (20b) are axially arranged in the transmission rod sleeve (8), one end of the liquid channel (21) is in contact with the end face of the sample (11), and the other end of the liquid channel is connected with a water injection pump station (40);
the end part of the side surface of the transmission rod sleeve (8) opposite to the sample (11) is provided with the resistance heating type coil pipe (28), the surface of the transmission rod sleeve (8) is distributed with the temperature sensor (30) and the humidity sensor (31), and the resistance heating type coil pipe (28) is connected to the industrial control computer (34) through the wire channel b (20 b); and the leads of the temperature sensor (30) and the humidity sensor (31) are connected with the dynamic data acquisition instrument (33) through the lead channel b (20 b).
2. The system for testing the dynamic impact damage of the coal rock under the coupling condition of the confining pressure and the damp and hot water as claimed in claim 1, wherein: the dynamic monitoring device comprises a high-speed camera (36); a transparent observation window (35) is arranged in the middle of the incident end cavity (6) opposite to the sample (11), and the high-speed camera (36) is correspondingly arranged outside the normal direction of the transparent observation window (35); the dynamic data acquisition instrument (33), the acoustic emission acquisition instrument (32) and the high-speed camera (36) are connected through leads.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810607313.1A CN109001053B (en) | 2018-06-13 | 2018-06-13 | Coal rock dynamic impact damage test system under confining pressure and damp-heat coupling condition |
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| CN201810607313.1A CN109001053B (en) | 2018-06-13 | 2018-06-13 | Coal rock dynamic impact damage test system under confining pressure and damp-heat coupling condition |
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| CN109001053B true CN109001053B (en) | 2021-01-12 |
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| CN113281175B (en) * | 2021-04-23 | 2022-07-05 | 中南大学 | Device and method for testing dynamic mechanical properties of rock in gas-solid coupling state |
| CN113281178A (en) * | 2021-05-19 | 2021-08-20 | 中国人民解放军国防科技大学 | Hydraulic fracturing experimental device and method based on separated Hopkinson pressure bar |
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