CN110108551B - Rock mechanical property testing device and method based on acoustic emission detection technology - Google Patents
Rock mechanical property testing device and method based on acoustic emission detection technology Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- G—PHYSICS
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- 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
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- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- 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
- G01N2203/0048—Hydraulic means
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- 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
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Abstract
The invention discloses a rock mechanical property testing device and method based on an acoustic emission detection technology, which comprises a rack, a test sample loading cavity and a test sample testing device, wherein the rack is provided with the test sample loading cavity; the device comprises a sample loading cavity, a rock sample loading cavity and a rock sample loading cavity, wherein a square surrounding rock sample is placed inside the sample loading cavity, a rock sample mounting hole is formed in the middle of the surrounding rock sample, and the rock sample is mounted in the rock sample mounting hole in a matched mode; the confining pressure loading system is used for applying confining pressure to the surrounding rock sample in the sample loading cavity; the first axial pressure loading system is used for independently applying axial pressure to the surrounding rock sample in the sample loading cavity; the first axial pressure loading system is used for independently applying axial pressure to the rock sample; and the acoustic emission detection device is used for detecting and collecting acoustic emission signals generated by the surrounding rock sample and the rock sample in the loading process. The first axial pressure loading system and the second axial pressure loading system which are independent of each other are arranged to be combined with the stress loading device in the horizontal direction, and the pressures which are perpendicular to each other are applied in the horizontal direction and the vertical direction, so that the real stress environment around the rock sample is simulated through an experiment.
Description
Technical Field
The invention belongs to the technical field of rock mechanical testing, and particularly relates to a rock mechanical property testing device and method based on an acoustic emission detection technology.
Background
The mechanical properties and the ground stress distribution condition of the rock are the basic basis of rock engineering design, construction and safety protection. Accurate test of rock mechanical properties and acoustic emission Kaiser point is crucial to grasp the mechanical properties of rock and ground stress condition. The mechanical properties and acoustic emission Kaiser point of rock are influenced not only by lithology but also by stress and loading environment.
The laboratory rock mechanics test is the most commonly used basic method by experts and scholars in the rock engineering field in the world at present when testing and researching the rock mechanics property and acoustic emission, and specifically comprises the following steps: the method comprises the steps of processing massive rocks collected from a rock engineering site into cylindrical or square samples meeting experimental standards by using a standard rock sample processing device, simulating the mechanical environment of the samples by using a rock compression experimental system and a confining pressure loading device or true triaxial loading equipment, and testing the mechanical properties of the samples. In addition, the acoustic emission of the rock is tested by connecting an acoustic emission probe to the compression bar or sample surface of the compression testing system.
However, in the mechanical testing process of the rock, the confining pressure loading device of the rock compression experiment system provides confining pressure in a mode of combining a sleeve with oil pressure, and in this case, only uniform confining pressure can be provided; when confining pressure loading is carried out through true triaxial loading equipment, a sample is usually a square sample, and the confining pressure loading in the horizontal direction can only provide stress in two directions and cannot reflect the true stress state of the sample.
In addition, in the process of sample deformation and damage, because confining pressure loading equipment or a true triaxial loading plate has obvious difference with the mechanical properties of the tested rock, the two confining pressure loading modes can not provide the real environment of the rock in the process of deformation and damage, and the accurate test of the rock mechanical property acoustic emission Kaiser point is seriously influenced.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, one of the objectives of the present invention is to provide a rock mechanical property testing device and method based on acoustic emission detection technology, which can simulate the real stress environment around the rock sample.
Compared with the prior art, the technical scheme is as follows:
rock mechanical properties testing arrangement based on acoustic emission detection technique includes:
the device comprises a rack, a sample loading cavity and a rock sample, wherein a square surrounding rock sample is placed in the sample loading cavity, a rock sample mounting hole is formed in the middle of the surrounding rock sample, and the rock sample is mounted in the rock sample mounting hole in a matched mode;
the confining pressure loading system is used for applying confining pressure to the surrounding rock sample in the sample loading cavity;
the first axial pressure loading system is used for independently applying axial pressure to the surrounding rock sample in the sample loading cavity;
the second axial pressure loading system is used for independently applying axial pressure to the rock sample;
the acoustic emission detection device is used for detecting and collecting acoustic emission signals generated by the surrounding rock sample and the rock sample in the loading process;
the confining pressure loading system, the first axial pressure loading system, the second axial pressure loading system and the acoustic emission detection device are all arranged on the rack.
Furthermore, the acoustic emission detection device comprises at least 8 acoustic emission probes arranged on the surface of the surrounding rock sample and a data acquisition instrument connected with the acoustic emission probes.
Further, the confining pressure loading system comprises four lateral loading plates arranged outside the four side walls of the surrounding rock sample and four lateral loading oil cylinders respectively connected with the lateral loading plates.
Furthermore, a loading platform is arranged on the rack, and the upper surface of the loading platform is concave inwards to form the sample loading cavity.
Further, the first axial compression loading system comprises a vertical loading plate arranged right above the surrounding rock sample and a first vertical loading oil cylinder driving the vertical loading plate to move up and down.
Furthermore, the second axial compression loading system comprises a vertical loading rod and a second vertical loading oil cylinder which drives the vertical loading rod to move up and down, a through hole is formed in the position, corresponding to the rock sample, of the vertical loading plate, and the vertical loading rod can pass through the through hole to load the rock sample.
A rock mechanical property testing method based on an acoustic emission detection technology uses the testing device and comprises the following steps:
s1: placing a surrounding rock sample in the sample loading cavity, and placing the rock sample in the rock sample mounting hole;
s2: arranging at least 8 acoustic emission probes of the acoustic emission detection device at different positions of the surrounding rock sample;
s3: according to the ground stress data of the rock, the surrounding rock sample is loaded through the surrounding pressure loading system and the first axial pressure loading system, the simulation of the stress environment around the rock sample is realized,
s4: loading the rock sample in a simulated stress environment through a second axial pressure loading system, recording related mechanical parameters, and simultaneously starting an acoustic emission detection device to acquire acoustic emission data of an acoustic emission probe;
s5: denoising, picking up and positioning the collected acoustic emission signals to obtain the acoustic emission condition of the rock sample, and further determining an acoustic emission Kaiser point.
Further, the specific process of step S5 is as follows:
s51: denoising, picking up and positioning the collected acoustic emission signals to obtain the acoustic emission condition of the rock sample, and further determining an acoustic emission Kaiser point;
the method comprises the following steps of (1) denoising collected acoustic emission signals:
s52: p wave first arrival picking is carried out on the denoised acoustic emission signals, and P wave first arrival points are obtained;
s53: randomly selecting m P wave arrival time data by adopting a bootstrap resampling method, and calculating by the formula (4) to obtain a positioning result
Wherein: min TL1 (x)0，y0，z0，t0) Is (x)0,y0,z0,t0) Target functions of seismic source positioning under four parameters; m is the number of acoustic emission probes participating in positioning, vpIs the P wave propagation velocity, /)i(x0，y0，z0) Is the distance between the source location and the ith acoustic emission probe, (x)0，y0，z0) As seismic source position coordinates, t0As the time of origin occurrence, tiIs the P wave first arrival time t of the ith acoustic emission probei＝tsi+(Pi-PSi)/fs. Wherein, tsiFor the time of triggering of the acoustic emission probe, PSiAnd PiRespectively the triggering point number of the acoustic emission probe and the first arrival point number f of the picked P wavesSampling frequency for the acoustic emission probe;
s54: repeating bootstrap resampling for q times to obtain q positioning results, namely
And then calculating the number of events in each positioning result set spherical radius, and taking the positioning corresponding to the maximum number of events as a final positioning result.
Further, the specific process of step S51 is as follows: firstly, an Empirical Mode Decomposition (EMD) is adopted to separate an original acoustic emission signal xj(i) Decomposed into n eigenmode components cj(i) And a residual term rn(i) And then removing the first few eigenmode components with variance contribution rate lower than 0.1.
Further, the specific process of step S52 is as follows: a sliding long-short time window method is adopted to remove signals of noise and low signal-to-noise ratio (the sliding long-short time window ratio lambda is less than 2.5), useful acoustic emission signals are obtained, rough P wave first arrival point numbers are picked up, and then a PAI-K _ AIC method in Chinese patent 201510312092.1 is adopted to realize high-precision picking of the P wave first arrival point numbers.
Further, the EMD decomposition and the variance contribution rate are calculated as shown in equations (1) and (2), respectively:
in the formula, xj(i) As the original acoustic emission signal waveform, cj(i) Is the jth eigenmode component, rn(i) Are residual terms.
And N is the total sampling point number of the acoustic emission signal.
Wherein vcr (j) is an eigenmode component cjThe variance contribution rate of (c).
Further, the sliding long-short time window method is calculated as shown in formula (3):
in the formula: λ (k) is kth (k)>WSTA) Ratio of short-time-window average amplitude to long-time-window average amplitude of a point, WSTAAnd WLTAThe length of the short and long time windows, respectively.
Furthermore, m is more than or equal to 4 and less than or equal to K, q is 2000, and K is the total number of the acoustic emission probes.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the rock sample is tightly attached to the square surrounding rock sample with the same lithology as the rock sample, the first axial pressure loading system and the second axial pressure loading system which are independent from each other are arranged, the pressures which are perpendicular to each other are applied in the horizontal direction and the vertical direction, so that the real stress environment around the rock sample is simulated through an experiment, the rock sample is compressed through the second axial pressure loading system, and the mechanical property of the rock is tested.
2. Full-automatic acoustic emission high accuracy positioning technology based on bootstrap resampling and data density carries out the automation to the acoustic emission signal and removes noise, accurate pick up and location, this positioning technology can make full use of acoustic emission time data, effectively reduce the influence that the P ripples first arrival picked up general error and big error (P ripples first arrival point number probably has certain error when picking up, in addition acoustic emission signal receives influence such as decay, the P ripples of picking up probably is not true P ripples, big error pick up the incident promptly), can obtain better rock sample acoustic emission condition and then confirm acoustic emission Kaiser point.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
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, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Referring to fig. 1, a rock mechanical property testing device based on an acoustic emission detection technology includes a rack 1, a confining pressure loading system, a first axial pressure loading system, a second axial pressure loading system, and an acoustic emission detection device.
Referring to fig. 1, a loading platform 2 is arranged on a frame 1, a sample loading cavity 3 is formed in the upper surface of the loading platform 2 in a concave manner, a square surrounding rock sample 4 is placed in the sample loading cavity 3, a rock sample mounting hole is formed in the middle of the surrounding rock sample 4, and a rock sample 5 is mounted in the rock sample mounting hole in a matched manner; the surrounding rock sample 4 and the rock sample 5 have the same lithology and other physical and mechanical properties, preferably, the rock taken from the same area or directly taken from the same rock, and the diameter of the rock sample 5 is the same as that of the rock sample mounting hole of the surrounding rock sample 4.
The confining pressure loading system, the first axial pressure loading system and the second axial pressure loading system are all arranged on the rack 1. The confining pressure loading system is used for applying confining pressure to a surrounding rock sample 4 in the sample loading cavity 3, the first axial pressure loading system is used for applying axial pressure to the surrounding rock sample 4 in the sample loading cavity 3 independently, the second axial pressure loading system is used for applying axial pressure to a rock sample 5 independently, and the acoustic emission detection device is used for detecting and collecting acoustic emission signals generated by the surrounding rock sample 4 and the rock sample 5 in the loading process.
This embodiment is through hugging closely rock sample 5 and arranging in the square country rock sample 4 with rock sample 5 lithology, through setting up mutually independent first axle pressure loading system and second axle pressure loading system, exert mutually perpendicular's pressure and then the experiment is simulated the true stress environment around rock sample 5 to level and vertical direction, compress rock sample 5 through second axle pressure loading system, and then test the mechanical properties of rock, can simulate the true stress situation of rock at the deformation destruction in-process, and then guaranteed the accuracy nature of rock mechanical properties acoustic emission Kaiser point test.
Referring to fig. 1, in an embodiment, the acoustic emission detection device of this embodiment includes at least 8 acoustic emission probes 6 disposed on the surface of the surrounding rock sample 4, and a data collector 7 connected to the acoustic emission probes 6, where the acoustic emission probes 6 are used to detect acoustic emission signals generated by loading the rock, and the data collector 7 is used to collect the detected acoustic emission signals. As for the types of the acoustic emission probe 6 and the data acquisition instrument 7, those skilled in the art can select the type adaptively according to the actual detection requirement, and details are not described herein.
Referring to fig. 1, in an embodiment, the confining pressure loading system includes four lateral loading plates 8 disposed outside four sidewalls of the surrounding rock sample 4 and four lateral loading cylinders 9 respectively connected to the lateral loading plates 8, the four lateral loading cylinders 9 are all fixedly mounted on the rack 1, a loading cavity is defined between the four lateral loading plates 8, the surrounding rock sample 4 is placed in the loading cavity, and the lateral loading plates 8 apply confining pressure to the surrounding rock sample 4 through driving of the lateral loading cylinders 9.
It is conceivable that, in practical design, the first axial compression loading system includes a vertical loading plate 10 disposed right above the surrounding rock sample 4 and a first vertical loading cylinder 11 for driving the vertical loading plate 10 to move up and down, the second axial compression loading system includes a vertical loading rod 12 and a second vertical loading cylinder 13 for driving the vertical loading rod 12 to move up and down, and both the first vertical loading cylinder 11 and the second vertical loading cylinder 13 are fixedly mounted on the rack 1.
Specifically, a through hole which is coaxial with the rock sample 5 and has the same size is formed in the middle of the vertical loading plate 10, a sleeve compression bar 14 which is coaxial with the through hole is fixedly installed at the top end of the vertical loading plate 10, the sleeve compression bar 14 is connected to a piston rod of the first vertical loading oil cylinder 11, the vertical loading rod 12 is axially slidably arranged on the sleeve compression bar 14 and can extend out from the through hole to carry out independent axial loading on the rock sample 5, and the diameter of the vertical loading rod 12 is basically the same as that of the rock sample 5.
During loading, the first vertical loading oil cylinder 11 drives the sleeve compression bar 14 to vertically move downwards until the vertical loading plate 10 is contacted with the surrounding rock sample, so that an axial load is applied to the surrounding rock sample, and the vertical loading rod 12 is driven by the second vertical loading oil cylinder 13 to axially slide along the sleeve compression bar 14, extend out of the vertical loading plate 10 and abut against the rock sample to axially and independently load the rock sample.
In the embodiment, the vertical loading plate 10 and the vertical loading rod 12 are controlled by independent hydraulic loading in the same way, the rock sample 5 and the surrounding rock sample 4 can be loaded axially and independently, and the simulation of different stress environments of the rock sample 5 is realized by adjusting the pressure of the lateral loading oil cylinder 9 and the pressure of the first vertical loading oil cylinder 11.
It should be noted that the rock specimen 5 may be a cylindrical or square specimen, and the shape of the through hole on the corresponding vertical loading rod 12 and vertical loading plate 10 is the same as the shape and size of the rock specimen 5.
The acoustic emission probes are connected to the data acquisition instrument 7 through an acoustic emission data integrator 13, and the acoustic emission probe further comprises a pair of oil pressure loading and unloading devices 15, wherein one oil pressure loading and unloading device 15 is connected to two opposite first vertical loading oil cylinders 11 through a hydraulic oil pipeline 14, the other oil pressure loading and unloading device 15 is connected to the other two opposite first vertical loading oil cylinders 1 through the hydraulic oil pipeline 14, a pressure gauge is arranged on the oil pressure loading and unloading device 15 and used for measuring the oil pressure of the hydraulic oil pipeline 14, and hydraulic oil is introduced into the first vertical loading oil cylinders 11 through the oil pressure loading and unloading devices to drive piston rods thereof to stretch. The specific structures of the loading cylinder and the oil pressure loading and unloading device are the prior art, and are not described herein again.
A rock mechanical property testing method based on an acoustic emission detection technology uses the testing device and comprises the following steps:
s1: placing a surrounding rock sample 4 in the sample loading cavity 3, and placing a rock sample 5 in a rock sample mounting hole;
s2: arranging at least 8 acoustic emission probes 6 of the acoustic emission detection device at different positions on the surface of the surrounding rock sample 4;
s3: according to the ground stress data of the rock, the surrounding rock sample 4 is loaded through the surrounding pressure loading system and the first axial pressure loading system, the simulation of the stress environment around the rock sample 5 is realized,
s4: loading the rock sample 5 in a simulated stress environment through a second axial pressure loading system, recording related mechanical parameters, and simultaneously starting an acoustic emission detection device to acquire acoustic emission data of an acoustic emission probe 6;
s5: denoising, picking up and positioning the collected acoustic emission signals to obtain the acoustic emission condition of the rock sample 5, and further determining an acoustic emission Kaiser point.
The specific process of step S5 is as follows:
denoising the collected acoustic emission signals: firstly, an Empirical Mode Decomposition (EMD) is adopted to separate an original acoustic emission signal xj(i) Decomposed into n eigenmode components cj(i) And a residual term rn(i) Then removing the first few intrinsic mode components with variance contribution rate lower than 0.1; the EMD decomposition and the variance contribution rate are calculated as shown in formulas (1) and (2), respectively:
in the formula, xj(i) As the original acoustic emission signal waveform, cj(i) Is the jth eigenmode component, rn(i) Are residual terms.
And N is the total number of signal sampling points detected by a single acoustic emission probe at one time.
Wherein vcr (j) is an eigenmode component cjThe variance contribution rate of (c).
P wave first break point number picking: a sliding long-short time window method is adopted to remove signals with low noise and signal-to-noise ratio (lambda is less than 2.5), useful acoustic emission signals are obtained, rough P wave first-arrival points are picked up, and then a PAI-K _ AIC method in a mine microseismic signal P wave first-arrival time combined picking method with the patent number of 201510312092.1 is adopted to realize high-precision picking of the P wave first-arrival points; wherein, the calculation of the sliding long-short time window method is shown as formula (3):
in the formula: λ (k) is kth (k)>WSTA) Ratio of short-time-window average amplitude to long-time-window average amplitude of a point, WSTAAnd WLTAThe length of the short and long time windows, respectively.
The new high-precision positioning method comprises the following steps: and (3) developing positioning research by means of a norm formula in the formula (4), wherein the formula takes the error existing in the acoustic emission signal pickup into consideration(4) The obtained single positioning stability is poor, m (m is more than or equal to 4 and less than or equal to 8) P wave arrival time data are randomly selected by adopting a bootstrap resampling method, and a positioning result is obtained by calculating according to a formula (4)
Repeating bootstrap resampling for q times to obtain q positioning results, namely
And then calculating the number of events in each positioning result set spherical radius, and taking the positioning corresponding to the maximum number of events as a final positioning result. And then calculating the number of events in the spherical radius of 1cm of each positioning result, and taking the positioning corresponding to the maximum number of events as a final positioning result.
Wherein, minTL1 (x)0,y0,z0,t0) Finger (x)0,y0,z0,t0) Target function of seismic source positioning under four parameters, m is the number of acoustic emission probes participating in positioning, vpIs the P wave propagation velocity, /)i(x0,y0,z0) Is the distance between the source location and the ith acoustic emission probe, (x)0，y0，z0) As seismic source position coordinates, t0As the time of origin occurrence, tiIs the P wave first arrival time t of the ith acoustic emission probei＝tsi+(Pi-PSi)/fs. Wherein, tsiFor the time of triggering of the acoustic emission probe, PSiAnd PiRespectively the triggering point number of the acoustic emission probe and the first arrival point number f of the picked P wavesThe sampling frequency of the acoustic emission probe.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (6)
1. A rock mechanical property testing method based on an acoustic emission detection technology is characterized by comprising the following steps:
s1: placing a surrounding rock sample in the sample loading cavity, and placing the rock sample in the rock sample mounting hole;
s2: arranging at least 8 acoustic emission probes of the acoustic emission detection device at different positions of the surrounding rock sample;
s3: according to the ground stress data of the rock, the surrounding rock sample is loaded through the surrounding pressure loading system and the first axial pressure loading system, the simulation of the stress environment around the rock sample is realized,
s4: loading the rock sample in a simulated stress environment through a second axial pressure loading system, recording related mechanical parameters, and simultaneously starting an acoustic emission detection device to acquire acoustic emission data of an acoustic emission probe;
s5: denoising, picking up and positioning the collected acoustic emission signals to obtain the acoustic emission condition of the rock sample, and further determining an acoustic emission Kaiser point;
the specific process of step S5 is as follows:
s51: denoising the collected acoustic emission signals;
s52: p wave first arrival picking is carried out on the denoised acoustic emission signals, and P wave first arrival points are obtained;
s53: randomly selecting m P wave arrival time data by adopting a bootstrap resampling method, and calculating by the formula (4) to obtain a positioning result
Wherein: minTL1 (x)0，y0，z0，t0) Is (x)0,y0,z0,t0) Target functions of seismic source positioning under four parameters; m is the number of acoustic emission probes participating in positioning, vpIs the P wave propagation velocity, /)i(x0，y0，z0) Is the distance between the source location and the ith acoustic emission probe, (x)0，y0，z0) As seismic source position coordinates, t0As the time of origin occurrence, tiIs the P wave first arrival time t of the ith acoustic emission probei＝tsi+(Pi-PSi)/fs(ii) a Wherein, tsiFor the time of triggering of the acoustic emission probe, PSiAnd PiRespectively the triggering point number of the acoustic emission probe and the first arrival point number f of the picked P wavesSampling frequency for the acoustic emission probe;
s54: repeating bootstrap resampling for q times to obtain q positioning results, namely
And then calculating the number of events in each positioning result set spherical radius, and taking the positioning corresponding to the maximum number of events as a final positioning result.
2. The test method according to claim 1, wherein the specific process of step S51 is as follows: firstly, an empirical mode decomposition method is adopted to decompose an original acoustic emission signal xj(i) Decomposed into n eigenmode components cj(i) And a residual term rn(i) And then removing the first few eigenmode components with variance contribution rate lower than 0.1.
3. The test method of claim 1, wherein: the acoustic emission detection device comprises at least 8 acoustic emission probes arranged on the surface of the surrounding rock sample and a data acquisition instrument connected with the acoustic emission probes.
4. The test method of claim 1, wherein: the confining pressure loading system comprises four lateral loading plates arranged outside four side walls of the surrounding rock sample and four lateral loading oil cylinders respectively connected with the four lateral loading plates.
5. The test method of claim 4, wherein: the first axial compression loading system comprises a vertical loading plate arranged right above the surrounding rock sample and a first vertical loading oil cylinder driving the vertical loading plate to move up and down.
6. The test method of claim 5, wherein: the second axial compression loading system comprises a vertical loading rod and a second vertical loading oil cylinder which drives the vertical loading rod to move up and down, a through hole is formed in the position, corresponding to the rock sample, of the vertical loading plate, and the vertical loading rod can pass through the through hole to load the rock sample.
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| CN112697617B (en) * | 2020-12-03 | 2022-02-01 | 中国科学院地质与地球物理研究所 | Method for quantitatively depicting progressive rock failure mechanical parameters |
| CN112611646A (en) * | 2021-01-05 | 2021-04-06 | 吉林大学 | High confining pressure rock mechanical property test device and test method |
| CN113504121B (en) * | 2021-06-16 | 2022-06-17 | 同济大学 | Built-in surrounding rock in-situ testing device and method for TBM supporting shoes |
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