CN110578516A - supercritical CO2Method for testing rock mass impact cracking damage under phase change pulse - Google Patents
supercritical CO2Method for testing rock mass impact cracking damage under phase change pulse Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 80
- 238000012360 testing method Methods 0.000 title claims abstract description 74
- 238000005336 cracking Methods 0.000 title claims abstract description 57
- 230000008859 change Effects 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 238000004364 calculation method Methods 0.000 claims abstract description 9
- 238000012806 monitoring device Methods 0.000 claims description 21
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- 230000000694 effects Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 2
- 238000012512 characterization method Methods 0.000 claims 1
- 239000012071 phase Substances 0.000 description 35
- 229910002092 carbon dioxide Inorganic materials 0.000 description 16
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- 239000011343 solid material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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Abstract
the invention provides supercritical CO2A method for testing rock mass impact cracking damage under phase change pulse. The method comprises the steps of constructing a fracturing hole and a sound wave test hole, installing vibration monitoring equipment, carrying out a sound wave test before fracturing, carrying out phase change expansion fracturing, carrying out a sound wave test after phase change fracturing, establishing a rock phase change fracturing damage calculation model and the like.
Description
Technical Field
The invention relates to the technical field of coal seam permeability increasing, in particular to a coal seam permeability increasing agentsupercritical CO2a method for testing rock mass impact cracking damage under phase change pulse.
Background
The carbon dioxide phase change expansion cracking rock breaking is to utilize liquid CO under certain pressure and temperature2(when the temperature is higher than 31.1 ℃ and the pressure is higher than 7.38MPa, CO2Supercritical state of changing gas phase into viscous liquid phase) and rapidly realizing liquid-gas phase change through the heating tube, wherein the volume is expanded by 600 times instantly, and strong physical pressure (more than 200 MPa) is generated, thereby achieving the effect of breaking rock. But CO2further research on shock wave response and rock mass damage rules under phase change pulses is needed. Therefore, a supercritical CO is provided2A method for testing rock mass impact cracking damage under phase change pulse.
Disclosure of Invention
The invention aims to provide supercritical CO2a method for testing rock mass impact cracking damage under phase change pulse aims at solving the problems in the prior art.
the technical solution adopted for the purpose of the invention is that a supercritical CO2The method for testing the rock mass impact cracking damage under the phase change impulse comprises the following steps:
1) and (4) constructing a cracking hole and a plurality of sound wave test holes in the rock body. Wherein the acoustic test hole is arranged in the fluctuating vibration region. The hole depth of the sound wave test hole is larger than that of the cracking hole.
2) And a plurality of vibration monitoring devices are arranged on the surface of the rock mass. A sonotrode probe is disposed in each sonic test hole. Wherein the vibration monitoring device is disposed within the fracture zone and the fluctuating vibration zone. And the vibration monitoring equipment is connected with the dynamic signal acquisition and analysis system. The sound wave instrument probe is connected with the sound wave instrument. And a plurality of sound wave measuring points are arranged at intervals along the axial direction of the sound wave testing hole. And the dynamic signal acquisition and analysis system and the acoustic wave instrument are connected with a computer.
3) And carrying out a sound wave test to obtain the wave velocity value of the sound wave before fracturing of the bedrock at each sound wave measuring point.
4) And filling the ultra-deep part of the hole bottom of the sound wave measuring hole to the same height mark as the designed height mark of the fracturing hole.
5) Mixing liquid CO2And pushing the fracturing pipe into the fracturing hole, and grouting and sealing the hole opening of the fracturing hole.
6) And (3) implementing phase change expansion fracturing, wherein the vibration time-course curve of the installation position of each vibration monitoring device in the fracturing process is captured by the vibration monitoring device.
7) and after the phase change cracking, removing slag and removing the hole bottom filler of the acoustic testing hole.
8) And carrying out a phase change fracturing acoustic wave test to obtain the corresponding rock acoustic wave velocity value of each measuring point after the phase change fracturing.
9) And establishing a rock phase change cracking damage calculation model.
Further, the vibration monitoring device employs a speed/acceleration sensor. The radius of the cracking hole is r. And a first measuring point group and a second measuring point group are respectively arranged on two sides of the fracturing hole. The first measuring point groups are arranged at positions which are separated from the fracturing holes 5r, 10r, 20r, 40r, … … and Nr in the upward direction of the fracturing hole and are respectively numbered. And the first measuring point group acquires the impact vibration speed/acceleration by using a speed/acceleration sensor. The second measuring point group is arranged between the fracturing hole and the face empty surface and is numbered respectively. And the second measuring point group is used for monitoring the rock medium shock wave in the minimum resistance line range and analyzing the vibration method effect caused by shock wave reflection.
Further, the hole depth of the cracking hole is h. The sound wave test hole is ultra deep with the hole depth of 1.5-3.0 m.
Further, the sonic instrument is RSM-SY 5 type sonic instrument. A one-transmission double-receiving probe in the hole is adopted, and the acoustic wave test is a single-hole method.
Further, step 9) the matrix comprises the following steps:
9.1) analyzing the energy characteristic values of the rocks under different cavity pressure characteristics and the explosion center distance based on the data acquired by the vibration monitoring equipment in the step 6). Obtaining supercritical CO2And (3) attenuation law of rock medium shock wave under the action of phase change expansion. Wherein the pressure characteristics include magnitude, time course and frequency. The energy characterizing values include vibration amplitude, frequency, and duration.
9.2) according to the rock damage range test, establishing the relation between the impact peak pressure and the rock damage degree at different cracking distances R.
9.3) establishing a rock phase change cracking damage calculation model by taking the relation between the pressure and the rock damage degree obtained in the step 9.2) and the wave velocity reduction rate of 10% after cracking as the basis for judging the rock damage range.
Further, a signal amplifier is connected between the vibration monitoring equipment and the dynamic signal acquisition and analysis system.
Furthermore, in the same sound wave test hole, the distance between every two adjacent sound wave test points is 10-20 cm.
The technical effects of the invention are undoubted:
A. Can develop supercritical CO2And (5) performing a rock mass impact cracking damage test under the phase change pulse, and obtaining the damage degree and range of the rock mass. The method can also be used for other cracking tests needing cracking materials such as concrete, reef or other synthetic solid materials;
B. Can develop supercritical CO2Testing the rock mass shock wave attenuation rule under the phase change pulse, and testing the dynamic parameters of the rock mass;
C. The relation between the impact peak pressure (peak velocity) at different fracturing distances R and the rock damage degree can be established, and a basis is provided for predicting the rock mass impact damage range.
Drawings
FIG. 1 is a schematic view of a damage testing apparatus layout;
fig. 2 is a schematic diagram of a sonic testing experimental arrangement.
In the figure: the device comprises a cracking hole 1, a rock body 2, vibration monitoring equipment 4, a signal amplifier 5, a dynamic signal acquisition and analysis system 6, a computer 7, a sound wave testing hole 8, a sound wave measuring point 9, a sound wave instrument probe 10 and a sound wave instrument 11.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
example 1:
This example discloses a supercritical CO2The method for testing the rock mass impact cracking damage under the phase change impulse comprises the following steps:
1) a fracture hole 1 and an acoustic wave test hole 8 are made in the rock body 2. Wherein the sonic testing holes 8 are arranged in the wave vibration zone. The depth of the cracking hole 1 is h. The sound wave test hole 8 is ultra deep with the hole depth of 1.5-3.0 m.
2) Vibration monitoring equipment 4 is mounted on the surface of the rock body 2. A sonotrode probe 10 is arranged in each sonotrode 8.
The vibration monitoring device 4 is arranged in the fissure zone and the wave vibration zone. The vibration monitoring device 4 is connected with a dynamic signal acquisition and analysis system 6. And a signal amplifier 5 is also connected between the vibration monitoring device 4 and the dynamic signal acquisition and analysis system 6.
The vibration monitoring device 4 employs a speed/acceleration sensor. The radius of the cracking hole 1 is r. Referring to fig. 1, a first measuring point group and a second measuring point group are respectively arranged on two sides of a fracturing hole 1. The first measuring point groups are arranged at positions radially distant from the fracture holes 15r, 10r, 20r, 40r, … …, Nr along the fracture hole 1 and are respectively numbered. And the first measuring point group acquires the impact vibration speed/acceleration by using a speed/acceleration sensor. The second measuring point group is arranged between the fracturing hole 1 and the face surface and is numbered respectively. And the second measuring point group is used for monitoring the rock medium shock wave in the minimum resistance line range and analyzing the vibration method effect caused by shock wave reflection.
The sonotrode probe 10 is connected to a sonotrode 11. Referring to fig. 2, sound wave measuring points 9 are arranged at intervals along the axial direction of the sound wave testing hole 8. In the same sound wave test hole 8, the distance between every two adjacent sound wave test points 9 is 10-20 cm. The dynamic signal acquisition and analysis system 6 and the acoustic wave instrument 11 are both connected with the computer 7. The acoustic wave instrument 11 adopts an RSM-SY 5 type acoustic wave instrument. A one-transmission double-receiving probe in the hole is adopted, and the acoustic wave test is a single-hole method.
3) And carrying out a sound wave test to obtain the wave velocity value of the sound wave before fracturing of the bedrock at each sound wave measuring point.
4) And filling the ultra-deep part of the hole bottom of the sound wave measuring hole 8 to the same design elevation as that of the fracturing hole 1.
5) Mixing liquid CO2And pushing the fracturing pipe into the fracturing hole 1, and grouting and sealing the hole opening of the fracturing hole 1.
6) And (3) implementing phase change expansion fracturing, wherein the vibration time-course curve of the installation position of each vibration monitoring device 4 in the fracturing process is captured by the vibration monitoring device 4.
7) and after the phase change cracking, removing slag and removing the filler at the bottom of the 8 holes of the acoustic testing hole.
8) And carrying out a phase change fracturing acoustic wave test to obtain the corresponding rock acoustic wave velocity value of each measuring point after the phase change fracturing.
9) And establishing a rock phase change cracking damage calculation model.
9.1) analyzing the energy characteristic values of the rocks under different cavity pressure characteristics and the explosion center distance based on the data acquired by the vibration monitoring equipment 4 in the step 6). Obtaining supercritical CO2And (3) attenuation law of rock medium shock wave under the action of phase change expansion. Wherein the pressure characteristics include magnitude, time course and frequency. The energy characterizing values include vibration amplitude, frequency, and duration.
9.2) according to the rock damage range test, establishing the relation between the impact peak pressure and the rock damage degree at different cracking distances R.
9.3) establishing a rock phase change cracking damage calculation model by taking the relation between the pressure and the rock damage degree obtained in the step 9.2) and the wave velocity reduction rate of 10% after cracking as the basis for judging the rock damage range.
and taking the wave velocity reduction rate of 10 percent after fracturing as a basis for judging the damage range of the rock mass. According to the technical specification of construction of excavation engineering of rock foundation of SL-94 hydraulic structure, the change characteristic that the difference between the wave speed of sound wave after fracturing and the wave speed before fracturing gradually decreases along with the depth of a hole is adopted, and the reduction rate of the wave speed of 10% after fracturing is taken as the basis for judging the damage range of the rock mass, namely the quantization standard is as follows:
If eta is more than 10%, judging that the rock mass is damaged by fracturing; if eta is less than or equal to 10 percent, the phase change cracking is judged to be safe, and the whole rock mass is stable.
example 2:
This example discloses a basic supercritical CO2The method for testing the rock mass impact cracking damage under the phase change impulse comprises the following steps:
1) a fracture hole 1 and a plurality of acoustic test holes 8 are made in the rock body 2. Wherein the sonic testing holes 8 are arranged in the wave vibration zone. The hole depth of the sound wave test hole 8 is larger than that of the cracking hole 1.
2) A plurality of vibration monitoring devices 4 are arranged on the surface of the rock body 2. A sonotrode probe 10 is arranged in each sonotrode 8. Wherein the vibration monitoring device 4 is arranged in the fracture zone and the wave vibration zone. The vibration monitoring device 4 is connected with a dynamic signal acquisition and analysis system 6. The sonotrode probe 10 is connected to a sonotrode 11. And a plurality of sound wave measuring points 9 are arranged at intervals along the axial direction of the sound wave testing hole 8. The dynamic signal acquisition and analysis system 6 and the acoustic wave instrument 11 are both connected with the computer 7.
3) And carrying out a sound wave test to obtain the wave velocity value of the sound wave before fracturing of the bedrock at each sound wave measuring point.
4) And filling the ultra-deep part of the hole bottom of the sound wave measuring hole 8 to the same design elevation as that of the fracturing hole 1.
5) Mixing liquid CO2And pushing the fracturing pipe into the fracturing hole 1, and grouting and sealing the hole opening of the fracturing hole 1.
6) And (3) implementing phase change expansion fracturing, wherein the vibration time-course curve of the installation position of each vibration monitoring device 4 in the fracturing process is captured by the vibration monitoring device 4.
7) and after the phase change cracking, removing slag and removing the filler at the bottom of the 8 holes of the acoustic testing hole.
8) And carrying out a phase change fracturing acoustic wave test to obtain the corresponding rock acoustic wave velocity value of each measuring point after the phase change fracturing.
9) and establishing a rock phase change cracking damage calculation model.
Example 3:
The main steps of this embodiment are the same as those of embodiment 2, wherein the vibration monitoring device 4 employs a speed/acceleration sensor. The radius of the cracking hole 1 is r. And a first measuring point group and a second measuring point group are respectively arranged on two sides of the fracturing hole 1. The first measuring point groups are arranged at positions radially distant from the fracture holes 15r, 10r, 20r, 40r, … …, Nr along the fracture hole 1 and are respectively numbered. And the first measuring point group acquires the impact vibration speed/acceleration by using a speed/acceleration sensor. The second measuring point group is arranged between the fracturing hole 1 and the face surface and is numbered respectively. And the second measuring point group is used for monitoring the rock medium shock wave in the minimum resistance line range and analyzing the vibration method effect caused by shock wave reflection.
Example 4:
The main steps of this example are the same as example 2, wherein the depth of the cleavage holes 1 is h. The sound wave test hole 8 is ultra deep with the hole depth of 1.5-3.0 m.
Example 5:
The main steps of this embodiment are the same as those of embodiment 2, wherein the sonic apparatus 11 is a RSM-SY 5 type sonic apparatus. A one-transmission double-receiving probe in the hole is adopted, and the acoustic wave test is a single-hole method.
example 6:
the main steps of this embodiment are the same as those of embodiment 2, wherein, step 9) of the substrate comprises the following steps:
9.1) analyzing the energy characteristic values of the rocks under different cavity pressure characteristics and the explosion center distance based on the data acquired by the vibration monitoring equipment 4 in the step 6). Obtaining supercritical CO2And (3) attenuation law of rock medium shock wave under the action of phase change expansion. Wherein the pressure characteristics include magnitude, time course and frequency. The energy characterizing values include vibration amplitude, frequency, and duration.
9.2) according to the rock damage range test, establishing the relation between the impact peak pressure and the rock damage degree at different cracking distances R.
9.3) establishing a rock phase change cracking damage calculation model by taking the relation between the pressure and the rock damage degree obtained in the step 9.2) and the wave velocity reduction rate of 10% after cracking as the basis for judging the rock damage range.
Example 7:
The main steps of this embodiment are the same as those of embodiment 2, wherein a signal amplifier 5 is further connected between the vibration monitoring device 4 and the dynamic signal acquisition and analysis system 6.
Example 8:
the main steps of the embodiment are the same as those of embodiment 2, wherein the distance between every two adjacent sound wave measuring points 9 in the same sound wave testing hole 8 is 10-20 cm.
Claims (7)
1. supercritical CO2the method for testing the rock mass impact cracking damage under the phase change impulse is characterized by comprising the following steps of:
1) applying a cracking hole (1) and a plurality of sound wave test holes (8) in a rock body (2); wherein the acoustic testing holes (8) are arranged in the wave vibration zone; the hole depth of the sound wave test hole (8) is larger than that of the cracking hole (1);
2) Installing a plurality of vibration monitoring devices (4) on the surface of the rock body (2); arranging a sonometer probe (10) in each sonic testing hole (8); wherein the vibration monitoring device (4) is arranged in a fracture zone and a fluctuating vibration zone; the vibration monitoring equipment (4) is connected with the dynamic signal acquisition and analysis system (6); the sound wave instrument probe (10) is connected with the sound wave instrument (11); a plurality of sound wave measuring points (9) are axially arranged along the sound wave testing hole (8) at intervals; the dynamic signal acquisition and analysis system (6) and the acoustic wave instrument (11) are both connected with the computer (7);
3) Carrying out a sound wave test to obtain the wave velocity value of the sound wave before fracturing of the bedrock at each sound wave measuring point;
4) Filling the ultra-deep part of the hole bottom of the sound wave measuring hole (8) to the same height mark as the designed height mark of the cracking hole (1);
5) mixing liquid CO2The fracturing pipe is pushed into the fracturing hole (1), and the hole opening of the fracturing hole (1) is subjected to grouting hole sealing;
6) Implementing phase change expansion fracturing, wherein the vibration monitoring equipment (4) captures a vibration time course curve of the installation position of each vibration monitoring equipment (4) in the fracturing process;
7) After the phase change fracturing, slag removal treatment is carried out, and fillers at the bottom of the sound wave test hole (8) are removed;
8) performing a phase change post-fracturing acoustic test to obtain rock acoustic wave velocity values corresponding to the measuring points after the phase change fracturing;
9) And establishing a rock phase change cracking damage calculation model.
2. a supercritical CO according to claim 12The method for testing the rock mass impact cracking damage under the phase change impulse is characterized by comprising the following steps: the vibration monitoring device (4) adopts a speed/acceleration sensor; the radius of the cracking hole (1) is r; a first measuring point group and a second measuring point group are respectively arranged on two sides of the cracking hole (1); the first measuring point groups are arranged at positions which are radially away from the cracking holes (1) by 5r, 10r, 20r, 40r, … … and Nr along the cracking holes (1) and are respectively numbered; the first measuring point group acquires impact vibration speed/acceleration by using a speed/acceleration sensor; the second measuring point group is arranged between the fracturing hole (1) and the blank surface and is numbered respectively; and the second measuring point group is used for monitoring the rock medium shock wave in the minimum resistance line range and analyzing the vibration method effect caused by shock wave reflection.
3. A supercritical CO according to claim 12The method for testing the rock mass impact cracking damage under the phase change impulse is characterized by comprising the following steps: the depth of the cracking hole (1) is h; the sound wave test hole (8) is ultra deep with the depth of 1.5-3.0 m.
4. A supercritical CO according to claim 12The method for testing the rock mass impact cracking damage under the phase change impulse is characterized by comprising the following steps: the acoustic wave instrument adopts RSM-SY 5 type acoustic wave instrument; a one-transmission double-receiving probe in the hole is adopted, and the acoustic wave test is a single-hole method.
5. A supercritical CO according to claim 12The method for testing the rock mass impact cracking damage under the phase change impulse is characterized in that the step 9) of the matrix comprises the following steps:
9.1) analyzing the energy characteristic values of rocks under different cavity pressure characteristics and the explosion center distance based on data acquired by the vibration monitoring equipment (4) in the step 6); obtaining supercritical CO2the attenuation rule of rock medium shock waves under the action of phase change expansion; wherein, pressureCharacteristics include size, time course and frequency; the energy characterization values comprise vibration amplitude, frequency and duration;
9.2) according to the rock damage range test, establishing the relation between the impact peak pressure at different cracking distances R and the rock damage degree;
9.3) establishing a rock phase change cracking damage calculation model by taking the relation between the pressure and the rock damage degree obtained in the step 9.2) and the wave velocity reduction rate of 10% after cracking as the basis for judging the rock damage range.
6. The rock mass impact cracking damage testing method under the supercritical CO2 phase change pulse according to claim 1, characterized in that: and a signal amplifier (5) is also connected between the vibration monitoring equipment (4) and the dynamic signal acquisition and analysis system (6).
7. The rock mass impact cracking damage testing method under the supercritical CO2 phase change pulse according to claim 1, characterized in that: in the same sound wave test hole (8), the distance between every two adjacent sound wave test points (9) is 10-20 cm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111472761A (en) * | 2020-05-07 | 2020-07-31 | 神华神东煤炭集团有限责任公司 | Main fracture structural surface determining method and monitoring equipment |
| CN111781277A (en) * | 2020-07-13 | 2020-10-16 | 中南大学 | Method for testing accumulated damage of broken rock on surrounding rock by hard rock high-pressure gas expansion method |
| CN113701805A (en) * | 2021-08-11 | 2021-11-26 | 中国地质大学（武汉） | System and method for testing internal temperature and internal pressure and external overpressure of carbon dioxide cracking tube |
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