CN112378741A - Acoustic emission probe fixing device and method for indoor rock mechanical test - Google Patents
Acoustic emission probe fixing device and method for indoor rock mechanical test Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a device and a method for fixing an acoustic emission probe for an indoor rock mechanical test, relates to the technical field of rock mechanical tests, solves the problem of fixing the acoustic emission probe, realizes three-dimensional positioning of a rock sample, and improves positioning accuracy. The fixing device comprises a base, a height limiting rod, an acoustic emission probe and a probe positioning nut, wherein a rock test piece is placed on the base, two ends of the height limiting rod are matched with a limiting groove on the base, the probe positioning nut is matched with a threaded hole on the height limiting rod, the acoustic emission probe is arranged in a probe sleeve ring at the end part of the probe positioning nut, and a spring is also arranged in the probe sleeve ring; the height limiting rod can be fixed on the base through a positioning nut, and the arrangement mode of the acoustic emission probe is adjusted through the arrangement of a threaded hole in the height limiting rod. The fixing device can be used for carrying out single-axis, double-axis and three-axis compression tests and rock shear tests on rocks, and the method also has the advantages of simplicity in operation, flexibility in adjustment and the like.
Description
Technical Field
The invention relates to the technical field of rock mechanics tests, in particular to a sound emission probe fixing device for an indoor rock mechanics test and a test method.
Background
Along with the construction of traffic infrastructure and water conservancy infrastructure, the mileage of hydraulic tunnels and traffic tunnels is continuously increased, and the development and utilization of deep underground spaces (subways, underground comprehensive pipe galleries, underground markets and the like) become important matters for the preferential development of a plurality of large and medium-sized cities; in addition, a high-level nuclear waste disposal warehouse, underground oil and gas resource exploitation, underground mineral resource development, high-speed railway traffic engineering construction and the like all need to be excavated in rock mass. The unloading action of rock mass excavation disturbs the original stress balance state of the underground, so that the internal stress of the exposed rock mass is redistributed, the stress concentration phenomenon is generated, and in addition, the actions of external construction disturbance, physical weathering, precipitation corrosion and the like are added, so that the rock mass is easy to destabilize and destroy under the influence of internal and external double factors, and thus danger is easy to occur, and economic loss is caused.
Therefore, the rock engineering in the construction or operation process needs to be monitored by an advanced monitoring means, so that early warning on possible instability damage is very important, and accurate prediction and forecast of time and space of the instability damage of the rock becomes a scientific problem which needs to be solved in the field of rock mechanics. Due to the non-uniformity of rock mass materials, under the action of load, sound emission phenomenon is generated in rocks due to initiation, expansion and penetration of microcracks. As early as the 40's of the last century, acoustic emission monitoring systems were used in the united states for rock mass stability monitoring. Before the rock mass is damaged, energy accumulated before the rock mass can be continuously released for a period of time, the amplitude and the density of the energy signal are continuously changed along with the adjacent instability of the rock mass structure, the energy signal is monitored and recorded by using an acoustic emission technology, and the damage process of the rock can be known. With the gradual improvement and development of the acoustic emission technology, the application research of the acoustic emission technology not only plays an important role in the aspects of slope stability, rock burst monitoring and prediction of deep-buried tunnels, rock breaking mechanism research, earthquake research and the like, but also has a very wide application prospect in the monitoring of deformation damage, surrounding rock stability and destruction characteristics of surrounding rocks of deep-buried underground engineering such as high radioactive nuclear waste geological disposal and the like.
The indoor rock mechanical test is an important means for researching the mechanical properties of rocks under different external environments (loading rate, loading mode and lithology). The indoor test can simplify complex geological conditions on site, single control variable and single factor are set, and the obtained test result can directly provide theoretical basis and parameter guidance for monitoring on site. In indoor single-axis, double-axis, triaxial compression test, shear test, the researcher is through gathering the acoustic emission signal of loading in-process, the damage degree of research rock inside to the location takes place the position of inside micro-fracture. By comparing and analyzing the characteristics of acoustic emission signals (such as amplitude, frequency, energy, impact, event and the like) when the rock is about to be damaged, indexes and methods capable of warning the macroscopic instability damage of the rock are searched. In the acoustic emission test, the acoustic emission probe directly contacts with the rock sample and receives the acoustic emission signal, and the acoustic emission probe is sensitive to the abnormal interference of the surrounding environment, and the fixed position of the acoustic emission probe and the contact coupling with the rock sample are the key problems for obtaining the reliable acoustic emission signal. If the contact is not good, a large amount of acoustic emission signals are attenuated, and real complete acoustic emission signals cannot be detected. In a general rock mechanics test, the acoustic emission probe is mainly installed by the following methods: (1) the acoustic emission probe is bonded with the surface of the rock by using high-strength glue, and the acoustic emission probe can be firmly fixed after the glue is cured; (2) the acoustic emission probe and the surrounding rock are bound by an adhesive tape or a rubber band, and the probe and the surrounding rock mass are relatively fixed.
The problems existing in the existing method for fixedly installing the acoustic emission probe are as follows: (1) the force for fixing the probe cannot be adjusted, the probe can be damaged when the force is too large, and the probe cannot be ensured to be in good contact with the surface of the test piece when the force is too small, so that the transmission of acoustic emission signals is influenced. (2) The installation process is time-consuming and labor-consuming, each probe needs to be pasted in a test in a grading mode, a large amount of time is consumed, and the standard degree of installation and the consistency between every two probes cannot be guaranteed. (3) In the process of the stress deformation of the rock sample, the adhesive tape or glue for fixing the probe is easy to loosen, so that the probe falls off, and the accuracy of the test result cannot be ensured. (4) The manual gluing or tape binding can cause the fixed position of the probe to be inaccurate, and the probe is easy to be misplaced, so that the positioning result of the acoustic emission event is influenced. (5) When the probe is fixed by glue, the probe is difficult to take down after the test is complete, and the glue remained on the acoustic emission probe for a long time can affect the service life and the detection precision of the probe.
In order to protect the acoustic emission probe from being damaged in the rock mechanics test and ensure the accuracy of acoustic emission monitoring data, the conventional fixing device and method need to be further improved.
Disclosure of Invention
The invention provides a device and a method for fixing an acoustic emission probe for an indoor rock mechanics test, which can fix the acoustic emission probe on a rock sample, realize plane positioning and three-dimensional positioning, improve positioning accuracy and conveniently obtain more effective acoustic emission event data. The specific technical scheme is as follows:
a sound emission probe fixing device for an indoor rock mechanical test comprises a base, a height limiting rod, a sound emission probe and a probe positioning nut, wherein a rock test piece is placed on the base, two ends of the height limiting rod are matched with a limiting groove on the base, the probe positioning nut is matched with a threaded hole on the height limiting rod, the sound emission probe is installed in a probe sleeve ring at the end part of the probe positioning nut, and a spring is also arranged in the probe sleeve ring; one end of the spring is fixed on the probe positioning nut, the other end of the spring is pressed on the acoustic emission probe, and the acoustic emission probe is tightly attached to the rock test piece; the height limiting rod slides along the limiting groove and is fixed on the base through a positioning nut, and the positioning nut is matched with threaded holes at two ends of the height limiting rod; and a lead groove is further formed in the probe lantern ring, and a lead of the acoustic emission probe is led out from the lead groove.
Preferably, the two ends of the height limiting rod are provided with right-angle bending parts matched with the limiting grooves, and the rock test piece is placed between the two height limiting rods.
It is also preferable that the length of the probe positioning nut is greater than the length of the threaded hole on the height limiting rod; the threaded holes are arranged at equal intervals.
Still preferably, the base has bottom plate and side shield, and the both ends of base are provided with the side shield, dispose the spacing groove on two sides of side shield respectively.
It is also preferable that a plurality of threaded holes are arranged on the side baffle plate, and the probe positioning nut and the threaded holes are installed in a matching mode.
Still preferably, install a plurality of high gag lever posts on the spacing groove, the edge of spacing groove still is provided with the scale.
A uniaxial compression test method utilizes the acoustic emission probe fixing device for the rock mechanics test, and comprises the following steps of;
s1, determining the fixed positions and the number of acoustic emission probes according to the size of a rock sample and a test purpose;
s2, mounting a height limiting rod, wherein the height limiting rod is mounted on a limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut;
s3, mounting the acoustic emission probe, namely mounting probe positioning nuts on the base and the height limiting rod, leading wires of the acoustic emission probe are led out from a lead wire groove of a probe sleeve ring, rotating the probe positioning nuts, and enabling the acoustic emission probe to be in close contact with the rock sample;
and S4, applying an axial load to the rock sample, performing a uniaxial compression test, and recording parameters of amplitude, frequency, energy, impact and event number by the acoustic emission probe.
A biaxial compression test method utilizes the acoustic emission probe fixing device for the rock mechanics test, and comprises the following steps of;
s1, determining the fixed positions and the number of acoustic emission probes according to the size of a rock sample and a test purpose;
s2, mounting a height limiting rod, wherein the height limiting rod is mounted on a limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut;
s3, installing an acoustic emission probe, installing a probe positioning nut on the height limiting rod, leading out a lead of the acoustic emission probe from a lead groove of a probe sleeve ring, and rotating the probe positioning nut to enable the acoustic emission probe to be in close contact with the rock sample;
and S4, applying a vertical load from the upper surface of the rock sample, applying a lateral load to the rock sample from an opening on the side baffle, performing a biaxial compression test, and recording parameters of amplitude, frequency, energy, impact and event number by using the acoustic emission probe.
A triaxial compression test method, utilize the above-mentioned a acoustic emission probe fixing device for rock mechanics test, the step includes;
s1, determining the fixed positions and the number of acoustic emission probes according to the size of a rock sample and a test purpose;
s2, mounting a height limiting rod, wherein the height limiting rod is mounted on a limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut;
s3, installing an acoustic emission probe, leading out a lead wire of the acoustic emission probe from a lead wire groove of a probe sleeve ring, rotating a probe positioning nut, and enabling the acoustic emission probe to be in close contact with the rock sample;
and S4, applying a vertical load from the upper surface of the rock sample, applying confining pressure from the side surface of the rock sample, performing a triaxial compression test, and recording parameters of amplitude, frequency, energy, impact and event number by using the acoustic emission probe.
A shear test method, utilize the above-mentioned a acoustic emission probe fixing device for rock mechanics tests, the step includes;
s1, determining the fixed positions and the number of acoustic emission probes according to the size of a rock sample and a test purpose;
s2, mounting a height limiting rod, wherein the height limiting rod is mounted on a limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut;
s3, installing an acoustic emission probe, leading out a lead wire of the acoustic emission probe from a lead wire groove of a probe sleeve ring, rotating a probe positioning nut, and enabling the acoustic emission probe to be in close contact with the rock sample;
and S4, arranging an upper shearing box above the base, applying loads to the base and the upper shearing box simultaneously, carrying out a shearing test, and recording parameters of amplitude, frequency, energy, impact and event number by the acoustic emission probe.
The acoustic emission probe fixing device and method for the indoor rock mechanical test have the advantages that:
(1) the acoustic emission probe fixing device moves up and down through the height limiting rod, so that the mounting height of the acoustic emission probe can be adjusted, and the accuracy of the fixing position of the acoustic emission probe is improved; and the special structure of the probe positioning nut can ensure that the acoustic emission probe is tightly attached to the rock test piece, so that the accuracy of the acoustic emission probe for receiving signals can be improved, the acoustic emission probe cannot be loosened or fall off even if the rock is deformed or damaged by impact in the test process, and the continuity of monitoring data is ensured.
(2) The structure of the fixing device can be flexibly combined, three-dimensional positioning of the acoustic emission probe can be realized by using a plurality of height limiting rods, and measuring points can also be flexibly arranged by arranging a plurality of threaded holes on the height limiting rods; a plurality of threaded holes are arranged on the side baffle plate, so that the number and the positions of the acoustic emission probes can be flexibly set.
(3) The acoustic emission probe fixing device can be used in a uniaxial compression test, a biaxial compression test and a triaxial compression test, so that the acoustic emission probe fixing device is wide in application range. In addition, the acoustic emission probe has the advantages of long service life, convenience in disassembly and assembly, accuracy in measurement, uniform installation standard and the like.
Drawings
FIG. 1 is a schematic structural view of an acoustic emission probe fixture;
FIG. 2 is a front view of an acoustic emission probe fixture;
FIG. 3 is a side view of an acoustic emission probe fixture;
FIG. 4 is a top view of an acoustic emission probe fixture;
FIG. 5 is a schematic structural view of a probe positioning nut;
FIG. 6 is a schematic diagram of a disassembled structure of the probe positioning nut;
in the figure: 1-a base, 2-a height limiting rod, 3-an acoustic emission probe, 4-a probe positioning nut and 5-a rock test piece; 6-positioning the nut; 7-bottom plate, 8-side baffle, 9-spacing groove, 10-threaded hole, 11-probe lantern ring, 12-spring.
Detailed Description
Referring to fig. 1 to 6, the acoustic emission probe fixing device and method for indoor rock mechanics tests provided by the present invention have the following specific embodiments.
The utility model provides an acoustic emission probe fixing device for indoor rock mechanics is experimental, specifically includes base 1, high gag lever post 2, acoustic emission probe 3 and probe set nut 4. The fixing device ensures that the acoustic emission probe in an indoor rock mechanical test is accurately and stably fixed, and can be fixed on a rock sample, so that plane positioning and three-dimensional positioning are realized, the positioning precision is higher, and more effective acoustic emission event data can be conveniently obtained.
The rock test piece 5 is placed on the base 1, and the base 1 is made by rigid material, and high gag lever post 2 both ends coordinate with the spacing groove on the base, and the cooperation mode includes modes such as track cooperation, cup joint cooperation, grafting cooperation. The probe positioning nut 4 is matched with a threaded hole in the height limiting rod 2, the probe positioning nut 4 can be rotationally pushed along the threaded hole, and the acoustic emission probe 3 is installed in a probe sleeve ring at the end part of the probe positioning nut, so that the acoustic emission probe 3 can be conveniently disassembled, the acoustic emission probe is well protected, a spring is further arranged in a probe sleeve ring 11, and the acoustic emission probe is tightly fixed on a rock test piece through elastic force after the spring 12 is compressed. Specifically, one end of the spring 12 is fixed on the probe positioning nut, the other end is pressed on the acoustic emission probe 3, and the acoustic emission probe 3 is tightly attached to the rock test piece 5. High gag lever post 2 slides along the spacing groove and fixes on the base through set nut, and set nut 6 cooperates with the screw hole at high gag lever post 2 both ends, thereby set nut 6 is through compressing tightly the position of spacing groove edge fixed height gag lever post. Still be provided with the lead wire groove on the probe lantern ring 11, the lead wire of acoustic emission probe 3 is derived from the lead wire groove to the problem of mechanical compaction fixed acoustic emission probe extrusion lead wire has been solved.
The both ends of high gag lever post are provided with in this embodiment with spacing groove complex right angle kink, and rock test piece 5 places the position between two high gag lever posts, and the length dimension of rock test piece 5 equals the distance between the side shield, and the height of rock test piece 5's highly less than or equal to side shield. The length of the probe positioning nut 4 is larger than the length of a threaded hole in the height limiting rod, and the end part of the probe positioning nut 4 extends out and is pressed on the rock test piece. The threaded holes 10 are arranged at equal intervals, so that measuring points can be uniformly arranged; in addition, the components can be arranged in a staggered mode or at intervals according to requirements; or a plurality of rows of threaded holes 10 can be arranged according to the width of the height limiting rod 2, so that the arrangement of the measuring points can be flexibly adjusted.
The base 1 is provided with a bottom plate 7 and side baffles 8, the bottom plate 7 and the side baffles 8 are vertically arranged, the side baffles 8 are fixed on the bottom plate, the side baffles are arranged at two ends of the base 7, limiting grooves are respectively arranged on two side edges of the side baffles 8, and the height of each limiting groove 9 can be equal to that of each side baffle 8; only the height limiting rod 2 is arranged between the side baffles 8, so that the damage process of rock time can be conveniently observed. A plurality of threaded holes can be arranged on the side baffle 8, and the probe positioning nut 4 and the threaded hole 10 are installed in a matched mode. In addition, a plurality of height limiting rods 2 can be arranged on the limiting groove, and a scale is arranged at the edge of the limiting groove 9.
A uniaxial compression test method utilizes the acoustic emission probe fixing device for the rock mechanics test, and comprises the following steps of;
s1, determining the fixed positions and the number of the acoustic emission probes according to the size of the rock sample and the test purpose. The size of the rock test piece is larger, more measuring points can be arranged, and the position of the acoustic emission probe can be determined according to the purpose of the rock test, so that the change condition in the loading process can be monitored more accurately.
S2, installing a height limiting rod, wherein the height limiting rod is installed on a limiting groove, the installation height of the high-speed limiting rod is fixed through a positioning nut, and the limiting groove is tightly matched with the height limiting rod, so that the horizontal arrangement of the height limiting rod can be guaranteed.
And S3, installing the acoustic emission probe, wherein probe positioning nuts are installed on the base and the height limiting rod, a lead wire of the acoustic emission probe is led out from a lead wire groove of the probe sleeve ring, the probe positioning nut is rotated, and the acoustic emission probe is in close contact with the rock sample. In the process, the acoustic emission probe is stored in the probe sleeve ring after the spring plays a role, and then the spring presses the acoustic emission probe to be attached to the rock sample.
And S4, applying an axial load to the rock sample so as to perform a uniaxial compression test, and recording parameters of amplitude, frequency, energy, impact and event number by the acoustic emission probe. According to the measuring parameters, the damage degree in the rock is researched, the position where internal micro-fracture occurs is located, and indexes and methods capable of warning the macroscopic destabilization damage of the rock are searched by comparing and analyzing the characteristics of acoustic emission signals (such as amplitude, frequency, energy, impact, event and the like) when the rock is about to be damaged.
A biaxial compression test method utilizes the acoustic emission probe fixing device for the rock mechanics test, and comprises the following steps of;
s1, determining the fixed positions and the number of the acoustic emission probes according to the size of the rock sample and the test purpose.
And S2, mounting a height limiting rod, wherein the height limiting rod is mounted on the limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut.
And S3, installing the acoustic emission probe, only installing a probe positioning nut on the height limiting rod, leading wires of the acoustic emission probe are led out from a lead wire groove of the probe sleeve ring, rotating the probe positioning nut, and enabling the acoustic emission probe to be in close contact with the rock sample.
And S4, applying a vertical load from the upper surface of the rock sample, applying a lateral load to the rock sample from an opening on the side baffle, performing a biaxial compression test, and recording the number parameters of amplitude, frequency, energy, impact and acoustic emission events by the acoustic emission probe.
A triaxial compression test method, utilize the above-mentioned a acoustic emission probe fixing device for rock mechanics test, the step includes;
s1, determining the fixed positions and the number of the acoustic emission probes according to the size of the rock sample and the test purpose.
And S2, mounting a height limiting rod, wherein the height limiting rod is mounted on the limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut.
S3, installing an acoustic emission probe, leading out a lead wire of the acoustic emission probe from a lead wire groove of a probe sleeve ring, rotating a probe positioning nut, and enabling the acoustic emission probe to be in close contact with the rock sample;
and S4, applying a vertical load from the upper surface of the rock sample, applying confining pressure from the side surface of the rock sample, performing a triaxial compression test, and recording parameters of amplitude, frequency, energy, impact and event number by using the acoustic emission probe. Wherein the lateral surface is exerted and is confined the pressure and can set up the opening on the side shield and carry out the loading to two sides, directly carries out the loading to the rock sample in high gag lever post below in addition.
A shear test method, utilize the above-mentioned a acoustic emission probe fixing device for rock mechanics tests, the step includes;
s1, determining the fixed positions and the number of acoustic emission probes according to the size of a rock sample and a test purpose;
s2, mounting a height limiting rod, wherein the height limiting rod is mounted on a limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut;
s3, installing an acoustic emission probe, leading out a lead wire of the acoustic emission probe from a lead wire groove of a probe sleeve ring, rotating a probe positioning nut, and enabling the acoustic emission probe to be in close contact with the rock sample;
and S4, arranging an upper shearing box above the base, applying loads to the base and the upper shearing box, wherein the base is equivalent to a lower shearing box, carrying out a shearing test, and recording parameters of amplitude, frequency, energy, impact and event number by the acoustic emission probe. Researching the damage degree in the rock according to the measurement parameters, positioning the position where the internal micro-fracture occurs, and searching for an index and a method capable of warning the macroscopic destabilization damage of the rock by comparing and analyzing the characteristics of acoustic emission signals (such as amplitude, frequency, energy, impact, event and the like) when the rock is about to be damaged
The acoustic emission probe fixing device moves up and down through the height limiting rod, so that the mounting height of the acoustic emission probe can be adjusted, and the accuracy of the fixing position of the acoustic emission probe is improved; and the special structure of the probe positioning nut can ensure that the acoustic emission probe is tightly attached to the rock test piece, so that the accuracy of the acoustic emission probe for receiving signals can be improved, the acoustic emission probe cannot be loosened or fall off even if the rock is deformed or damaged by impact in the test process, and the continuity of monitoring data is ensured. Three-dimensional positioning of the acoustic emission probe can be realized by using a plurality of height limiting rods, and measuring points can be flexibly arranged by arranging a plurality of threaded holes on the height limiting rods; a plurality of threaded holes are arranged on the side baffle plate, so that the number and the positions of the acoustic emission probes can be flexibly set.
The acoustic emission probe fixing device can be used in a uniaxial compression test, a biaxial compression test and a triaxial compression test, so that the acoustic emission probe fixing device is wide in application range. In addition, the acoustic emission probe has the advantages of long service life, convenience in disassembly and assembly, accuracy in measurement, uniform installation standard and the like.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A sound emission probe fixing device for an indoor rock mechanical test is characterized by comprising a base, a height limiting rod, a sound emission probe and a probe positioning nut, wherein a rock test piece is placed on the base, two ends of the height limiting rod are matched with limiting grooves in the base, the probe positioning nut is matched with a threaded hole in the height limiting rod, the sound emission probe is installed in a probe sleeve ring at the end part of the probe positioning nut, and a spring is also arranged in the probe sleeve ring; one end of the spring is fixed on the probe positioning nut, the other end of the spring is pressed on the acoustic emission probe, and the acoustic emission probe is tightly attached to the rock test piece; the height limiting rod slides along the limiting groove and is fixed on the base through a positioning nut, and the positioning nut is matched with threaded holes at two ends of the height limiting rod; and a lead groove is further formed in the probe lantern ring, and a lead of the acoustic emission probe is led out from the lead groove.
2. The acoustic emission probe fixing device for the rock mechanics test according to claim 1, wherein the two ends of the height limiting rod are provided with right-angled bent portions matched with the limiting grooves, and the rock test piece is placed between the two height limiting rods.
3. The acoustic emission probe fixing device for the rock mechanics test of claim 1, wherein the length of the probe positioning nut is greater than the length of the threaded hole on the height limiting rod; the threaded holes are arranged at equal intervals.
4. The acoustic emission probe fixing device for the rock mechanics test according to claim 1 or 3, wherein the base is provided with a bottom plate and side baffles, the two ends of the base are provided with the side baffles, and the two side edges of the side baffles are respectively provided with a limiting groove.
5. The acoustic emission probe fixing device for the rock mechanics test of claim 4, characterized in that a plurality of threaded holes are arranged on the side baffle, and the probe positioning nut and the threaded holes are installed in a matching way.
6. The acoustic emission probe fixing device for the rock mechanics test of claim 4, wherein a plurality of height limiting rods are installed on the limiting groove, and a ruler is further arranged on the edge of the limiting groove.
7. A method of uniaxial compression testing using an acoustic emission probe mount for rock mechanics testing as claimed in any one of claims 1 to 6, the steps comprising:
s1, determining the fixed positions and the number of acoustic emission probes according to the size of a rock sample and a test purpose;
s2, mounting a height limiting rod, wherein the height limiting rod is mounted on a limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut;
s3, mounting the acoustic emission probe, namely mounting probe positioning nuts on the base and the height limiting rod, leading wires of the acoustic emission probe are led out from a lead wire groove of a probe sleeve ring, rotating the probe positioning nuts, and enabling the acoustic emission probe to be in close contact with the rock sample;
and S4, applying an axial load to the rock sample, performing a uniaxial compression test, and recording parameters of amplitude, frequency, energy, impact and event number by the acoustic emission probe.
8. A method of biaxial compression testing using the acoustic emission probe fixture for rock mechanics testing of any one of claims 1 to 6, the method comprising the steps of:
s1, determining the fixed positions and the number of acoustic emission probes according to the size of a rock sample and a test purpose;
s2, mounting a height limiting rod, wherein the height limiting rod is mounted on a limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut;
s3, installing an acoustic emission probe, installing a probe positioning nut on the height limiting rod, leading out a lead of the acoustic emission probe from a lead groove of a probe sleeve ring, and rotating the probe positioning nut to enable the acoustic emission probe to be in close contact with the rock sample;
and S4, applying a vertical load from the upper surface of the rock sample, applying a lateral load to the rock sample from an opening on the side baffle, performing a biaxial compression test, and recording parameters of amplitude, frequency, energy, impact and event number by using the acoustic emission probe.
9. A method of triaxial compression testing using an acoustic emission probe mount for rock mechanics testing as claimed in any one of claims 1 to 6, the method comprising the steps of;
s1, determining the fixed positions and the number of acoustic emission probes according to the size of a rock sample and a test purpose;
s2, mounting a height limiting rod, wherein the height limiting rod is mounted on a limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut;
s3, installing an acoustic emission probe, leading out a lead wire of the acoustic emission probe from a lead wire groove of a probe sleeve ring, rotating a probe positioning nut, and enabling the acoustic emission probe to be in close contact with the rock sample;
and S4, applying a vertical load from the upper surface of the rock sample, applying confining pressure from the side surface of the rock sample, performing a triaxial compression test, and recording parameters of amplitude, frequency, energy, impact and event number by using the acoustic emission probe.
10. A method of shear testing using an acoustic emission probe mount for rock mechanics testing as claimed in any one of claims 1 to 6, characterised by the steps of;
s1, determining the fixed positions and the number of acoustic emission probes according to the size of a rock sample and a test purpose;
s2, mounting a height limiting rod, wherein the height limiting rod is mounted on a limiting groove, and the mounting height of the high-speed limiting rod is fixed through a positioning nut;
s3, installing an acoustic emission probe, leading out a lead wire of the acoustic emission probe from a lead wire groove of a probe sleeve ring, rotating a probe positioning nut, and enabling the acoustic emission probe to be in close contact with the rock sample;
and S4, arranging an upper shearing box above the base, applying loads to the base and the upper shearing box simultaneously, carrying out a shearing test, and recording parameters of amplitude, frequency, energy, impact and event number by the acoustic emission probe.
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Application publication date: 20210219 |