CN112362482A - Rock point load test method - Google Patents
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- CN112362482A CN112362482A CN202011202044.4A CN202011202044A CN112362482A CN 112362482 A CN112362482 A CN 112362482A CN 202011202044 A CN202011202044 A CN 202011202044A CN 112362482 A CN112362482 A CN 112362482A
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- 239000011435 rock Substances 0.000 title claims abstract description 45
- 238000010998 test method Methods 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 44
- 239000010720 hydraulic oil Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000003921 oil Substances 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 16
- 230000010354 integration Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- G01N3/08—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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording 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
- G01N2203/0048—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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0208—Specific programs of loading, e.g. incremental loading or pre-loading
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0212—Theories, calculations
- G01N2203/0218—Calculations based on experimental data
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention discloses a rock point load test method, which comprises a point load bracket, wherein the top of the surface of the point load bracket is fixedly connected with a point load bracket beam, the bottom surface of the cross beam of the point load support is fixedly connected with a fixed loading cone, the front side surface of the point load support is provided with a point load test platform, the front side surface of the point load support is fixedly provided with a miniature laser range finder, the surface of the point load support is in threaded connection with a fixing screw, and a safety protection plate is fixedly connected between the fixing screw and the point load support, and a hydraulic jack is arranged at the rear side of the safety protection plate, compared with a point load tester in the prior art, the integral structure of the invention simplifies the structure of the tester, realizes the structural integration, improves the efficiency and the safety of the tester, and the full-automatic point load experiment control, the full-automatic point load experiment data acquisition and the full-automatic rock uniaxial compressive strength calculation are realized.
Description
Technical Field
The invention relates to the technical field of rock compressive strength determination, in particular to a rock point load test method.
Background
The point loading test is a simple method for testing the compressive strength of rock, concrete or other natural building materials under point loading, and is an important index for the classification research of rock mass and the measurement of rock mass strength parameters in rock mass engineering. The test method of the rock point load strength is recommended by the test method Committee of the International society of rock mechanics in 1972, and is revised in 1985. During the test, a sample is clamped between two spherical loading conical heads, and load is applied until the sample is fractured. The tensile strength of the sample can be obtained according to the maximum load when the sample is damaged and the distance between the end points of the two conical heads, and the compressive strength of the sample can be calculated empirically. The method has the advantages that the instrument and equipment are portable, the instrument and equipment can be carried to the field for testing, the sample does not need to be processed, and test data can be obtained in time. According to the rock point load strength index, the uniaxial compressive strength of the rock can be calculated and determined, the anisotropy of the rock (namely the ratio of the maximum value to the minimum value in different point load strengths) is judged, the weathering zone is determined, the rock drilling speed is estimated, the rock is graded, and the like.
The existing point load test equipment mainly comprises an STDZ-2 type rock point load tester and an R-PIT type digital display point load tester, and the two are similar in structure. The R-PIT type portable point load testing machine consists of a loading system and a load measuring system. The loading system comprises a loading frame, a loading cone, a loading jack and a manual hydraulic pump; the curvature radius of the spherical surface of the loading cone is 5.0mm, the vertex angle of the cone is 60 degrees, and the loading cone is made of hard materials; the loading device adopts a manual hydraulic oil pump, and hydraulic pressure is transmitted to the loading cone by a jack piston to apply load to the test. The load measuring system adopts a DY-2000 type digital tester.
The disadvantages of this type of instrument are: the loading device adopts a hand-operated hydraulic oil pump, the required labor intensity is high under the condition of large test quantity, the loading device needs to be assembled when a DY-2000 type digital tester is adopted for testing, the equipment structure of the measuring system is complex, the cost is high, and the assembly and disassembly are complex; each test piece needs an experimenter to measure the length, the width and the height of the test piece, so that a great amount of time of the experimenter is consumed when point load experiments of a plurality of groups of test pieces are carried out. And one experimenter is difficult to complete the experiment; a large amount of time is wasted for experimenters in calculation and processing of a large amount of repeated data in the later period; in the test process, the rock is easy to be pressed to pop up, and the tester is easy to be shot by the rock bomb to be injured.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a rock point load test method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rock point load test method comprises a point load support, wherein the top of the surface of the point load support is fixedly connected with a point load support beam, the bottom surface of the point load support beam is fixedly connected with a fixed loading cone, the front side surface of the point load support is provided with a point load test platform, the front side surface of the point load support is fixedly provided with a miniature laser range finder, the surface of the point load support is in threaded connection with a fixed screw, a safety protection plate is fixedly connected between the fixed screw and the point load support, the rear side of the safety protection plate is provided with a hydraulic jack, the hydraulic jack is in threaded connection with a fixing bolt of the test instrument, a movable loading cone is arranged in the hydraulic jack, the bottom of the jack is fixedly connected with a hydraulic oil pipe, the middle part of the hydraulic oil pipe is provided with a hydraulic sensor and a check valve, hydraulic pressure oil pipe right-hand member fixedly connected with gear pump, the inside fixed mounting of gear pump has gear pump shell, the inside gear that is equipped with of gear pump shell, the inside gear fixed pin that is equipped with of gear, the left side fixedly connected with hydraulic oil storage device of gear pump, hydraulic oil storage device left side fixedly connected with unloading valve, and unloading valve left end and hydraulic jack bottom fixed connection, tester left side activity is pegged graft and is had USB data transmission line, USB data transmission line left side slip is pegged graft and is had the computer.
Preferably, the point load experiment platform is connected with the point load support in a sliding mode, the point load experiment platform can be pushed to ascend in the ascending process of the movable hydraulic loading cone to apply load to the experiment test piece together with the fixed loading cone, and the point load experiment platform can automatically descend to reach the initial position after pressure is relieved by the unloading valve.
Preferably, the number of the safety protection plates is two, the two safety protection plates are respectively positioned on the front side and the rear side of the middle part of the point load support, and the safety protection plates are made of explosion-proof transparent materials.
A rock point load testing method comprises the following steps:
s1: the computer control software sends an instruction, the single chip microcomputer sends the instruction to the driving motor to drive the gear pump to pump low-pressure hydraulic oil out of the hydraulic oil storage device and pressurize the low-pressure hydraulic oil, and then the low-pressure hydraulic oil is input into the hydraulic jack through the hydraulic oil pipe to push the movable hydraulic loading cone to move upwards and apply a vertical load to the middle rock together with the fixed loading cone;
s2: the hydraulic sensor arranged in the hydraulic oil pipe collects real-time hydraulic data and transmits the real-time hydraulic data to computer control software through a USB data transmission line for storage, the computer can also collect and calculate the average width of a damage surface of a test piece through two micro laser distance measuring instruments arranged on a point load bracket, and the computer can also collect and calculate the distance between loading points of the test piece through two micro laser distance measuring instruments arranged on a movable loading cone of a fixed loading cone;
s3: calculating the load strength of an unmodified point of each test piece by a calculation formula of a computer background, deleting three values from the highest value and the lowest value when the measured point load strength data are more than fifteen, and only deleting the highest value and the lowest value if the measured data are less, then calculating the arithmetic mean value of the values to be used as the point load strength of the group of rocks, wherein an Excle table can be derived from the calculation result in a menu bar by deriving options;
s4: and the computer control software clicks a reset button to control an unloading valve installed in the hydraulic oil pipe to release the hydraulic oil in the hydraulic jack back to the hydraulic oil storage device.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a rock point load test method, which is characterized in that a fixed loading cone and a movable hydraulic loading cone are arranged on a point load support, a miniature laser range finder is arranged on the point load support, a hydraulic sensor is arranged in a hydraulic pipe, computer control software is arranged in a computer, and a safety protection plate is arranged on the point load support;
2. by introducing the computer control device and the automatic measuring device, the measuring process is automatically carried out, the measured data is comprehensive, visual and reliable, the test labor intensity can be greatly reduced, the working efficiency is improved, and the tester can directly observe the rock crushing process through the transparent safety protection plate.
3. Compared with the point load tester in the prior art, the integral structure of the invention simplifies the structure of the tester, realizes structural integration, improves the efficiency and safety of the tester, and realizes full-automatic point load experiment control, full-automatic point load experiment data acquisition and full-automatic rock uniaxial compressive strength calculation.
Drawings
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is a schematic view of a connection structure of the hydraulic jack and the electro-hydraulic device according to the present invention;
FIG. 3 is a schematic diagram of an electro-hydraulic apparatus according to the present invention;
FIG. 4 is a schematic diagram of the circuit structure of the present invention;
FIG. 5 is a schematic diagram of the computer control software of the present invention;
in the figure: the device comprises a 1-point load support cross beam, a 2-point micro laser range finder, a 3-point load experiment platform, a 4-point load support, a 5-fixed load cone, a 6-safety protection plate, a 7-movable hydraulic load cone, 8-fixed screws, 9-hydraulic jacks, 10-fixed bolts, 11-hydraulic oil storage devices, 12-hydraulic oil pipes, 13-hydraulic sensors, 14-unloading valves, 15-one-way valves, 16-USB data transmission lines, 17-computer control software, 18 gears, 19 gear pumps, 20-gear pump housings, 21-gear pump oil inlets and 22-gear fixed pins.
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. 1-5, a rock point load test method comprises a point load support 4, a point load support beam 1 is fixedly connected to the top of the surface of the point load support 4, a fixed loading cone 5 is fixedly connected to the bottom surface of the point load support beam 1, a point load test platform 3 is installed on the front side surface of the point load support 4, the point load test platform 3 is connected with the point load support 4 in a sliding manner, the point load test platform 3 is pushed to ascend in the ascending process of a movable hydraulic loading cone 7 to apply load to an experimental test piece together with the fixed loading cone 5, a micro laser range finder 2 is fixedly installed on the front side surface of the point load support 4, the micro laser range finder 2 is fixed in the middle of the 4 load support through a clamping groove, and after a tested piece is placed, the average width of the test piece can be measured by manually controlling and adjusting the two 2 micro laser range fin, the surface of the point load support 4 is in threaded connection with a fixing screw 8, safety protection plates 6 are fixedly connected between the fixing screw 8 and the point load support 4, the number of the safety protection plates 6 is two, the two safety protection plates 6 are respectively positioned on the front side and the rear side of the middle part of the point load support 4, the safety protection plates 6 are made of an explosion-proof transparent material, rock crushing and splashing in the pressurizing process can be prevented from hurting an experimenter by arranging the two safety protection plates 6, the experimenter can observe the complete crushing process of the rock, a hydraulic jack 9 is arranged below a cross beam 1 of the point load support, a fixing bolt 10 is in threaded connection with the hydraulic jack 9 and a base of an experimental instrument, a movable loading cone 7 is arranged in the hydraulic jack 9, a hydraulic oil pipe 12 is fixedly connected to the bottom of the jack 9, a hydraulic sensor 13 and a one-way valve 15 are arranged in, the right end of the hydraulic oil pipe 12 is fixedly connected with a gear pump 19, the gear pump 19 is fixedly provided with a gear pump shell 20 inside the gear pump 19, a gear 18 is arranged inside the gear pump shell 20, a gear fixing pin 22 is arranged inside the gear 18, the left side of the gear pump 19 is fixedly connected with a hydraulic oil storage device 11, the left side of the hydraulic oil storage device 11 is fixedly connected with an unloading valve 14, the left end of the unloading valve 14 is fixedly connected with the bottom of a hydraulic jack 9, the point load experiment platform 3 can automatically descend to an initial position after the unloading valve 14 is decompressed, the left side of the tester is movably inserted with a USB data transmission line 16, the left side of the USB data transmission line 16 is slidably inserted with a computer 17, the single chip microcomputer is connected with an external computer 17 through the USB data transmission line 16, and control software can start and end the point load, after the same group of test piece point load experiments are finished, the calculation button is clicked, and the uniaxial compressive strength of the rock can be calculated by automatically processing data.
A rock point load testing method comprises the following steps:
s1: the computer 17 controls software to send an instruction, the single chip microcomputer sends the instruction to a driving motor to drive a gear pump 19 to pump low-pressure hydraulic oil out of a hydraulic oil storage device 11 and pressurize the low-pressure hydraulic oil, and then the low-pressure hydraulic oil is input into a hydraulic jack 9 through a hydraulic oil pipe 12 to push a movable hydraulic loading cone 7 to move upwards and apply a vertical load to a middle rock together with a fixed loading cone 5;
s2: the hydraulic sensor 13 arranged in the hydraulic oil pipe 12 collects real-time hydraulic data and transmits the real-time hydraulic data to the control software of the computer 17 for storage through the USB data transmission line 16, the computer 17 can also collect and calculate the average width of the damage surface of the test piece through the two micro laser distance measuring instruments 2 arranged on the point load support 4, and the computer 17 can also collect and calculate the distance between the loading points of the test piece through the two micro laser distance measuring instruments 2 arranged on the movable loading cone 7 of the fixed loading cone 5;
s3: calculating the uncorrected point load strength of each test piece through a calculation formula of a background of a computer 17, deleting three of the highest and lowest values respectively when the measured point load strength data are more than fifteen, and only deleting the highest and lowest values if the measured data are less, then calculating the arithmetic mean value of the highest and lowest values to be used as the point load strength of the group of rocks, wherein the calculation result can be used for deriving an Excle table through deriving options in a menu bar;
s4: the computer 17 controls the software to click the reset button, and controls the unloading valve 14 installed in the hydraulic oil pipe 12 to return the hydraulic oil in the hydraulic jack 9 to the hydraulic oil storage device 11.
The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.
In conclusion, according to the rock point load test method provided by the invention, the fixed loading cone 5 and the movable hydraulic loading cone 7 are arranged on the point load support 4, the miniature laser range finder is arranged on the point load support, the hydraulic sensor 13 is arranged in the hydraulic pipe 12, the computer control software 17 is arranged in the computer, and the safety protection plate 6 is arranged on the point load support 4, so that compared with the existing measurement system, the measurement structure is simpler and safer to operate, needs fewer experimenters, can directly obtain the uniaxial compressive strength of the rock after the experiment is finished, and can better realize the integration of the loading system and the measurement system; by introducing the computer control device 4 and the automatic measuring device 5, the measuring process is automatically carried out, the measured data is comprehensive, visual and reliable, the test labor intensity can be greatly reduced, the working efficiency is improved, and the tester can directly observe the rock crushing process through the transparent safety protection plate 6; compared with the point load tester in the prior art, the integral structure of the invention simplifies the structure of the tester, realizes structural integration, improves the efficiency and safety of the tester, realizes full-automatic point load experiment control, full-automatic point load experiment data acquisition and full-automatic rock uniaxial compressive strength calculation, and solves the problems of the defects in the prior art.
It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A rock point load test method comprises a point load support (4) and is characterized in that a point load support beam (1) is fixedly connected to the top of the surface of the point load support (4), a fixed loading cone (5) is fixedly connected to the bottom surface of the point load support beam (1), a point load test platform (3) is installed on the front side surface of the point load support (4), a micro laser range finder (2) is fixedly installed on the front side surface of the point load support (4), a fixing screw (8) is in threaded connection with the surface of the point load support (4), a safety protection plate (6) is fixedly connected between the fixing screw (8) and the point load support (4), a hydraulic jack (9) is arranged below the point load support beam (1), and a fixing bolt (10) is in threaded connection with the hydraulic jack (9) and a test instrument base, be equipped with movable loading awl (7) in hydraulic jack (9), jack (9) bottom fixedly connected with hydraulic pressure oil pipe (12), hydraulic pressure oil pipe (12) mid-mounting has hydraulic pressure sensor (13) and check valve (15), and hydraulic pressure sensor (13) are located check valve (15) left side, hydraulic pressure oil pipe (12) right-hand member fixedly connected with gear pump (19), gear pump housing (20) is fixed to gear pump (19) inside, gear pump housing (20) inside is equipped with gear (18), gear (18) inside is equipped with gear fixed pin (22), the left side fixedly connected with hydraulic oil storage device (11) of gear pump (19), hydraulic oil storage device (11) left side fixedly connected with off-load valve (14), and off-load valve (14) left end and hydraulic jack (9) bottom fixed connection, the tester is characterized in that a USB data transmission line (16) is movably inserted on the left side of the tester, and a computer (17) is slidably inserted on the left side of the USB data transmission line (16).
2. The rock point load test method according to claim 1, characterized in that the point load test platform (3) is connected with the point load support (4) in a sliding manner, the movable hydraulic loading cone (7) can push the point load test platform (3) to ascend in the ascending process to apply load to the test sample together with the fixed loading cone (5), and the point load test platform (3) can automatically descend to the initial position after the unloading valve (14) is depressurized.
3. The rock point load test method according to claim 1, characterized in that the number of the safety protection plates (6) is two, the two safety protection plates (6) are respectively arranged at the front side and the rear side of the middle part of the point load support (4), and the safety protection plates (6) are made of an explosion-proof transparent material.
4. A rock point load testing method according to claim 1, comprising the steps of:
s1: the computer (17) controls software to send an instruction, the single chip microcomputer sends the instruction to the driving motor to drive the gear pump (19) to pump low-pressure hydraulic oil out of the hydraulic oil storage device (11) and pressurize the low-pressure hydraulic oil, and then the low-pressure hydraulic oil is input into the hydraulic jack (9) through the hydraulic oil pipe (12) to push the movable hydraulic loading cone (7) to move upwards and apply a vertical load to the middle rock together with the fixed loading cone (5);
s2: a hydraulic sensor (13) arranged in a hydraulic oil pipe (12) collects real-time hydraulic data and transmits the real-time hydraulic data to control software of a computer (17) through a USB data transmission line (16) for storage, the computer (17) can also collect and calculate the average width of a damage surface of a test piece through two micro laser distance meters (2) arranged on a point load support (4), and the computer (17) can also collect and calculate the distance between loading points of the test piece through two micro laser distance meters (2) arranged on a movable loading cone (7) of a fixed loading cone (5);
s3: calculating the uncorrected point load strength of each test piece by a calculation formula of a computer (17) background, deleting three of the highest and lowest values respectively when the measured point load strength data are more than fifteen, and deleting only the highest and lowest values if the measured data are less, then calculating the arithmetic mean value of the highest and lowest values to be used as the point load strength of the group of rocks, wherein the calculation result can be used for deriving an Excle table in a menu bar by deriving options;
s4: and a reset button is clicked at the control software of the computer (17), and an unloading valve (14) arranged in a hydraulic oil pipe (12) is controlled to release the hydraulic oil in the hydraulic jack (9) back to the hydraulic oil storage device (11).
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| CN202011202044.4A CN112362482A (en) | 2020-11-02 | 2020-11-02 | Rock point load test method |
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| CN202011202044.4A CN112362482A (en) | 2020-11-02 | 2020-11-02 | Rock point load test method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358473A (en) * | 2021-06-21 | 2021-09-07 | 重庆交通大学 | Special testing device for rock fracture toughness convenient for direct field work |
| CN114813366A (en) * | 2022-03-11 | 2022-07-29 | 中国人民解放军32182部队 | Rock sample pressure data measuring method and device |
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