CN112525733B - Anchor rod impact strength in-situ testing device and testing method - Google Patents
Anchor rod impact strength in-situ testing device and testing method Download PDFInfo
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 57
- 238000012360 testing method Methods 0.000 title abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims abstract description 19
- 230000008859 change Effects 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 238000010998 test method Methods 0.000 claims description 17
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 239000011435 rock Substances 0.000 abstract description 23
- 238000009863 impact test Methods 0.000 abstract description 12
- 238000011160 research Methods 0.000 abstract description 11
- 239000003245 coal Substances 0.000 description 6
- 238000005065 mining Methods 0.000 description 6
- 238000004873 anchoring Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000013101 initial test Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 238000010008 shearing 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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
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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
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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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
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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Abstract
The embodiment of the invention provides an anchor rod impact strength in-situ testing device and a testing method, which comprise the following steps: an impact mechanism and a monitoring mechanism; the impact mechanism comprises an impact body and an impact disc, the impact body comprises a first disc body, a second disc body and a counterweight rod, the impact disc is fixedly connected with the first disc body, the second disc body is connected with the impact disc through a guide chain, one end of the counterweight rod is connected to the bottom end of the second disc body, and the counterweight rod is used for installing the counterweight body; the monitoring mechanism comprises a pressure sensor and an image acquisition unit, the pressure sensor is fixed on the anchor rod to be detected, the impact disc is carried at the bearing end of the pressure sensor, and the image acquisition unit is used for acquiring the displacement change of the anchor rod in the impact process. The invention can realize the impact process research under the anchor rod in-situ working state, can be compared and combined with the laboratory anchor rod impact test data, can carry out in-situ impact test under different impact energy, and can simulate the multiple impact process of rock burst roadway for the anchor rod which is not invalid in support.
Description
Technical Field
The invention relates to the technical field of coal mining equipment, in particular to an anchor rod impact strength in-situ testing device and a testing method.
Background
Along with the continuous expansion of the mining depth and range of coal, the dynamic disaster accidents accompanying the coal are more serious, wherein the rock burst accident is the most prominent, and the safe and efficient mining of mines is severely restricted by the characteristics of easy generation, multiple generation and difficult prevention and control of the rock burst. The rock burst is a dynamic phenomenon of sudden and violent damage caused by the instant release of elastic energy of a coal rock body in a coal mining space, and the damage process of the coal rock body is accompanied by the characteristics of vibration, loud sound, air waves and the like. According to statistics, more than 85% of rock burst accidents occur in the stoping roadway, and the control of the rock burst of the stoping roadway becomes the key of surrounding rock control. And the roadway anti-impact support is used as the last line of defense for preventing and controlling the rock burst of the mining roadway, and a reasonable support scheme is determined, so that the damage degree of the rock burst to the roadway can be effectively reduced, and the safety of lives and properties of a mining space is ensured.
The method for preventing and controlling the roadway support with the rock burst mainly comprises high-strength anchor rod support, a U-shaped shed, an anti-impact support and the like, the anchor rod support is convenient to construct, large pre-tightening force can be applied, the bearing anti-impact capability of surrounding rocks can be fully adjusted, and the method becomes a main support mode for controlling the surrounding rocks of the roadway with the rock burst at present. Based on the characteristic that the rock bolt support is matched with the rock burst roadway to deform and damage, domestic and foreign scientific researchers successively research and develop novel support materials such as high impact toughness anchor rods, constant-resistance large-deformation anchor rods, prestress Yielding anchor rods, garford anchor rods, durabar anchor rods, yielding Secura anchor rods and Roofex anchor rods. Whether the anchor bolt supporting system has effective impact resistance is determined by the combined action of various components in the anchor bolt supporting system, wherein the result is mainly determined by the elongation of the anchor bolt body and the impact resistance of the anchoring end, so that the research on the impact resistance of the anchor bolt supporting system is an effective way for solving the problem of roadway supporting by rock burst. Aiming at the impact resistance of the anchor rod, related scholars at home and abroad mainly carry out laboratory research, and research means of the laboratory research comprise axial impact of the anchor rod body, transverse shearing impact of the anchor rod body, impact of an anchor rod support system and the like.
Disclosure of Invention
The embodiment of the invention provides an anchor rod impact strength in-situ testing device and a testing method, which are used for overcoming the defect that the impact process research of an anchor rod in an in-situ working state is lacked in the prior art.
The embodiment of the invention provides an anchor rod impact strength in-situ testing device, which comprises: an impact mechanism and a monitoring mechanism; wherein,
the impact mechanism comprises an impact body and an impact disc, the impact body comprises a first disc body, a second disc body and a counterweight rod, the impact disc is positioned above the first disc body and fixedly connected with the first disc body, the second disc body is positioned below the first disc body and connected with the impact disc through a guide chain, one end of the counterweight rod is connected to the bottom end of the second disc body, and the counterweight rod is used for installing the counterweight body;
the monitoring mechanism comprises a pressure sensor and an image acquisition unit, the pressure sensor is fixed on the anchor rod to be detected, the impact disc is carried on the bearing end of the pressure sensor, and the image acquisition unit is used for acquiring displacement change of the anchor rod in the impact process.
The first tray body is arranged on the first tray body, and the second tray body is arranged on the second tray body and is used for being connected with or separated from the first tray body.
The switch control mechanism is an electromagnetic chuck, and the electromagnetic chuck is arranged at the bottom end of the first disc body.
The tray is arranged at the top end of the impact disc in a pressing mode.
The bottom of the anchor rod to be detected is provided with a threaded portion, and the threaded portion of the anchor rod to be detected is screwed in through a nut and is used for bearing and fixing the pressure sensor.
The first disc body and the impact disc form a sleeve structure as a bottom surface and a top surface, the anchor rod to be tested is arranged in the sleeve in a penetrating mode, and the pressure sensor is installed in the sleeve.
And the bottom end of the counterweight rod is provided with a bearing plate for carrying the counterweight body.
Wherein the image acquisition unit is a high-speed camera.
According to another aspect of the embodiment of the invention, a testing method of an anchor rod impact strength in-situ testing device is provided, which comprises the following steps:
s1, controlling the guide chain between the second disc body and the impact disc to be in a loose state, and installing a counterweight body with preset weight on the counterweight rod;
s2, controlling the counterweight rod and the counterweight body to drive the second disc body to fall freely, forcing the guide chain to be straightened, transmitting kinetic energy generated by falling to the impact disc through the guide chain, driving the anchor rod to be tested to carry out on-site in-situ impact through the impact disc, and opening the pressure sensor and the image acquisition unit;
s3, fitting a displacement-time curve of the end part of the anchor rod through the displacement change of the anchor rod to be detected in the in-situ impact process, which is acquired by the image acquisition unit, fitting an impact load-time curve of the anchor rod through the pressure change acquired by the pressure sensor, and fitting the displacement-time curve and the impact load-time curve to obtain a load-displacement curve;
and S4, if the anchor bolt support to be tested does not lose efficacy, repeating the steps S1-S3 until the anchor bolt support to be tested loses efficacy.
Wherein, the step S1 specifically comprises the following steps: opening the electromagnetic chuck at the bottom end of the first tray body to enable the bottom end of the first tray body to be in close contact with the top end of the second tray body;
the step S2 specifically comprises the following steps: and closing the electromagnetic chuck to separate the first disk body from the second disk body, wherein the second disk body is driven by the counterweight rod and the counterweight body to freely fall.
According to the anchor rod impact strength in-situ test device and the test method provided by the embodiment of the invention, an in-situ impact process is simulated through the first disc body, the second disc body and the counterweight rod, the impact force is transmitted to the anchor rod and the pressure sensor through the impact disc, in the anchor rod in-situ impact process, the impact load and displacement change borne by the anchor rod are respectively monitored through the pressure sensor and the image acquisition unit, and a load-displacement curve in the anchor rod in-situ impact process is drawn in a fitting manner; according to the anchor rod impact strength in-situ testing device and method provided by the embodiment of the invention, the impact process research of the anchor rod in the in-situ working state can be realized, the impact process research can be compared and combined with the laboratory anchor rod impact test data, the in-situ impact test can be carried out aiming at different impact energy, and the multiple impact processes of the rock burst roadway can be simulated aiming at the anchor rod which is not in failure for supporting.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an anchor rod impact strength in-situ testing device according to an embodiment of the invention;
FIG. 2 is a schematic cross-sectional view of an anchor rod in an initial testing state according to an embodiment of the invention;
FIG. 3 is a cross-sectional view illustrating a free-falling state of the second tray according to the embodiment of the present invention;
fig. 4 is a cross-sectional schematic view of an impact state of a bolt in accordance with an embodiment of the present invention.
Reference numerals are as follows:
1: an anchor rod anchoring section; 2: an anchor rod free section; 3: a tray; 4: a sleeve; 5: an impact disk; 6: guiding a chain; 7: a first tray body; 8: a weight lever; 9: a counterweight body; 10: a pressure sensor; 11: a nut; 12: a second tray.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or point connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In the following, an in-situ test device for the impact strength of the anchor rod according to an embodiment of the present invention is described with reference to fig. 1 to 4, including: an impact mechanism and a monitoring mechanism; wherein,
the impact mechanism comprises an impact body and an impact disc 5, the impact body comprises a first disc body 7, a second disc body 12 and a counterweight rod 8, the impact disc 5 is positioned above the first disc body 7 and fixedly connected with the first disc body 7, the second disc body 12 is positioned below the first disc body 7 and connected with the impact disc 5 through a guide chain 6, one end of the counterweight rod 8 is connected to the bottom end of the second disc body 12, and the counterweight rod 8 is used for installing a counterweight body 9;
the monitoring mechanism comprises a pressure sensor 10 and an image acquisition unit (not shown in the figure), the pressure sensor 10 is fixed on the anchor rod to be measured, the impact disc 5 is carried at the bearing end of the pressure sensor 10, and the image acquisition unit is used for acquiring the displacement change of the anchor rod in the impact process.
Specifically, strike dish 5, first disk body 7 and second disk body 12 all can be the ring form in this embodiment, lead the kinetic energy that chain 6 carried when being used for dropping weight 9, counter weight 8 and second disk body 12 and transmit for strikeing dish 5, lead chain 6 and be four at least connections between strikeing dish 5 and first disk body 7, guarantee the even transmission of power, strikeing dish 5 can transmit kinetic energy for pressure sensor 10, the impact load of the stock that monitors to be measured. The specification of the counterweight body 9 can be selected according to the test requirements, and the in-situ impact test of the anchor rod under different impact energy can be completed by selecting counterweight bodies 9 with different weights.
In the initial state, the contact between the first disk 7 and the second disk 12 ensures that the chain 6 is in a slack state, in which the anchor is not impacted. After the counterweight body 9 is installed and released, at the moment, the second disc body 12 is separated from the first disc body 7, the second disc body 12 falls, the guide chain 6 is straightened, the kinetic energy during falling is transmitted to the impact disc 5, the impact disc 5 is pressed downwards, at the moment, the anchor rod anchoring section 1 and the anchor rod free section 2 are fixed in the roadway roof, the anchor rod starts to impact in situ, the pressure sensor 10 monitors the pressure change, and the pressure change is the impact force applied to the anchor rod; during the impact of the anchor rod, the anchor rod may be pulled out and damaged, and the displacement change of the anchor rod can be monitored by the image acquisition unit. And (3) fitting and drawing an impact load-time curve of the anchor rod by using data monitored by the pressure sensor 10, fitting and drawing a displacement-time curve of the end part of the anchor rod by using data monitored by the image acquisition unit, and fitting the two curves into a load-displacement curve in the anchor rod in-situ impact process. If the anchor bolt support does not fail, the replaceable counterweight body 9 is tested repeatedly, so that secondary impact under different impact energy effects can be realized, and the multiple impact process of the rock burst roadway can be effectively simulated until the anchor bolt support fails.
According to the anchor rod impact strength in-situ test device and the test method provided by the embodiment of the invention, an in-situ impact process is simulated through the first disc body 7, the second disc body 12 and the balance weight rod 8, the impact force is transmitted to the anchor rod and the pressure sensor 10 through the impact disc 5, in the anchor rod in-situ impact process, the impact load and displacement change borne by the anchor rod are respectively monitored through the pressure sensor 10 and the image acquisition unit, and a load-displacement curve in the anchor rod in-situ impact process is drawn in a fitting manner; the anchor rod impact strength in-situ test device and the test method provided by the embodiment of the invention can realize the impact process research under the anchor rod in-situ working state, can be compared and combined with the laboratory anchor rod impact test data, can perform in-situ impact test under different impact energy, and can simulate the multiple impact process of a rock burst roadway for the anchor rod which is not failed in support.
In one embodiment, the anchor impact strength in-situ testing device further comprises a switch control mechanism, wherein the switch control mechanism is arranged between the first disc body 7 and the second disc body 12 and is used for controlling connection or separation between the first disc body 7 and the second disc body 12. Preferably, the switch control mechanism is an electromagnetic chuck, and the electromagnetic chuck is arranged at the bottom end of the first disk body 7. In the present embodiment, the opening and closing of the electromagnetic chuck may control the connection or the disconnection of the first tray 7 and the second tray 12. It should be understood that when the first tray 7 and the second tray 12 are connected (i.e. the electromagnetic chuck is activated), the guide chain 6 should be in a relaxed state, i.e. as shown in fig. 2; when the chain 6 is in the straightened state, as shown in fig. 3 or fig. 4, the first tray 7 and the second tray 12 should be separated (i.e. the electromagnetic chuck is closed). Other switches may be used instead of the electromagnetic chuck according to the present embodiment according to practical needs, and the present invention is not limited thereto.
In one embodiment, the anchor rod impact strength in-situ testing device further comprises a tray 3, and the tray 3 is arranged on the top end of the impact disc 5 in a pressing mode. In the installation process, firstly, the impact disc 5 is arranged below the tray 3, then the tray 3 and the pressure sensor 10 are sequentially installed, sufficient pretightening force is applied, and the tray 3 is mainly used for installing and fixing the impact disc 5 on the anchor rod.
In one embodiment, a threaded portion is formed at the bottom of the anchor rod to be tested, and the threaded portion of the anchor rod to be tested is screwed in through a nut 11 for receiving and fixing the pressure sensor 10. In the present exemplary embodiment, the pressure sensor 10 is positioned by means of a nut 11, the impact disk 5 being pressed against the pressure sensor 10.
In one embodiment, the first disc body 7 and the impact disc 5 serve as a bottom surface and a top surface to form a sleeve 4 structure, the anchor rod to be tested is arranged in the sleeve 4 in a penetrating mode, and the pressure sensor 10 is installed in the sleeve 4.
In one embodiment, a bearing plate is arranged at the bottom end of the weight lever 8 for carrying the weight body 9. In this embodiment, the weight 9 is suspended from the load-bearing plate for providing kinetic energy during the impact test.
In one embodiment, the image acquisition unit is a high-speed camera, and displacement change of the anchor rod in the impact process can be monitored through the high-speed camera so as to fit and draw a displacement-time curve of the end part of the anchor rod.
The test method of the anchor rod impact strength in-situ test device provided by the embodiment of the invention is described below, and the anchor rod impact strength in-situ test device described above and the test method of the anchor rod impact strength in-situ test device described below can be referred to correspondingly.
The test method of the anchor rod impact strength in-situ test device provided by the embodiment of the invention comprises the following steps:
s1, as shown in figure 2, the guide chain 6 between the second disc body 12 and the impact disc 5 is controlled to be in a loose state, and the counterweight body 9 with preset weight is installed on the counterweight rod 8. In the step S1, firstly, the guide chain 6 is ensured to be in a loose state, i.e. the anchor rod does not bear the impact force, and the counterweight 9 with a predetermined weight is installed according to the actual requirement of the test.
S2, as shown in the figures 3 and 4, the counterweight rod 8 and the counterweight body 9 are controlled to drive the second disc body 12 to freely fall, the guide chain 6 is forced to be straightened, kinetic energy generated by falling is transmitted to the impact disc 5 through the guide chain 6, the impact disc 5 drives the anchor rod to be tested to carry out on-site in-situ impact, at the moment, the pressure sensor 10 and the image acquisition unit are opened, and the anchor rod to be tested is gradually pulled out until being damaged. In step S2, when the counterweight 9, the counterweight rod 8, and the second tray 12 freely fall, the gravitational potential energy is converted into kinetic energy, after the guide chain 6 is straightened, the kinetic energy is converted into impact force, the impact force is applied to the impact tray 5, the anchor rod to be tested deforms, the pressure sensor 10 monitors the pressure change, and the image acquisition unit monitors the displacement change of the end portion of the anchor rod.
And S3, fitting a displacement-time curve of the end part of the anchor rod through the displacement change of the anchor rod to be detected in the in-situ impact process, which is acquired by the image acquisition unit, fitting an impact load-time curve of the anchor rod through the pressure change acquired by the pressure sensor 10, and fitting the displacement-time curve and the impact load-time curve to obtain a load-displacement curve. In step S3, a load-displacement curve is drawn through fitting, and can be compared and combined with laboratory anchor rod impact test data
And S4, if the anchor bolt support to be tested does not lose efficacy, repeating the steps S1-S3 until the anchor bolt support to be tested loses efficacy, and simulating multiple impact processes of the rock burst roadway aiming at the anchor bolt which does not lose efficacy. It should be understood that when the retest is performed in the present embodiment, the counterweight body 9 with other weight can be replaced, and a plurality of different in-situ impact tests can be performed for different impact energy.
According to the testing method of the anchor rod impact strength in-situ testing device provided by the embodiment of the invention, the impact process research under the anchor rod in-situ working state can be realized, the testing method can be compared and combined with the laboratory anchor rod impact test data, the in-situ impact test can be carried out under different impact energy, and the multiple impact process of a rock burst roadway can be simulated for the anchor rod which is not failed in support
In one embodiment, step S1 specifically includes: opening the electromagnetic chuck at the bottom end of the first tray body 7 so that the bottom end of the first tray body 7 is in close contact with the top end of the second tray body 12;
the step S2 specifically comprises the following steps: and closing the electromagnetic chuck to separate the first disk body 7 from the second disk body 12, wherein the second disk body 12 is driven by the counterweight rod 8 and the counterweight body 9 to freely fall.
In this embodiment, the electromagnetic chuck may be used to control the contact state of the first tray body 7 and the second tray body 12, so as to control whether the anchor rod bears the impact force (when the electromagnetic chuck is started, the anchor rod does not bear the impact force, and after the electromagnetic chuck is closed, the anchor rod bears the impact force), that is, to control the test stage of the anchor rod impact strength in-situ testing apparatus of this embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An anchor rod impact strength in-situ test method is characterized by comprising the following steps:
stock impact strength normal position device, it includes:
an impact mechanism and a monitoring mechanism; wherein,
the impact mechanism comprises an impact body and an impact disc, the impact body comprises a first disc body, a second disc body and a counterweight rod, the impact disc is positioned above the first disc body and fixedly connected with the first disc body, the second disc body is positioned below the first disc body and connected with the impact disc through a guide chain, one end of the counterweight rod is connected with the bottom end of the second disc body, and the counterweight rod is used for installing the counterweight body;
the monitoring mechanism comprises a pressure sensor and an image acquisition unit, the pressure sensor is fixed on the anchor rod to be detected, the impact disc is arranged at the bearing end of the pressure sensor, and the image acquisition unit is used for acquiring the displacement change of the anchor rod in the impact process;
the test method using the anchor bolt impact strength in-situ device comprises the following steps:
s1, controlling the guide chain between the second disc body and the impact disc to be in a loose state, and installing a counterweight body with preset weight on the counterweight rod;
s2, controlling the counterweight rod and the counterweight body to drive the second disc body to fall freely, forcing the guide chain to be straightened, transmitting kinetic energy generated by falling to the impact disc through the guide chain, driving the anchor rod to be tested to carry out on-site in-situ impact through the impact disc, and opening the pressure sensor and the image acquisition unit;
s3, fitting a displacement-time curve of the end part of the anchor rod through the displacement change of the anchor rod to be detected in the in-situ impact process, which is acquired by the image acquisition unit, fitting an impact load-time curve of the anchor rod through the pressure change acquired by the pressure sensor, and fitting the displacement-time curve and the impact load-time curve to obtain a load-displacement curve;
and S4, if the anchor bolt support to be tested does not lose efficacy, repeating the steps S1-S3 until the anchor bolt support to be tested loses efficacy.
2. The in-situ test method for impact strength of the anchor rod according to claim 1, further comprising a switch control mechanism, wherein the switch control mechanism is arranged between the first disc and the second disc and used for controlling connection or separation between the first disc and the second disc.
3. The anchor rod impact strength in-situ test method according to claim 2, wherein the switch control mechanism is an electromagnetic chuck, and the electromagnetic chuck is arranged at the bottom end of the first disc body.
4. The in-situ test method for the impact strength of the anchor rod according to claim 1, wherein the in-situ test method further comprises a tray, and the tray is arranged on the top end of the impact disc in a pressing mode.
5. The anchor rod impact strength in-situ test method according to claim 1, wherein a threaded part is formed at the bottom of the anchor rod to be tested, and a nut is screwed into the threaded part of the anchor rod to be tested for bearing and fixing the pressure sensor.
6. The anchor rod impact strength in-situ test method according to claim 1, wherein the first disc body and the impact disc are used as a bottom surface and a top surface to form a sleeve structure, the anchor rod to be tested is arranged in the sleeve in a penetrating mode, and the pressure sensor is installed in the sleeve.
7. The in-situ test method for the impact strength of the anchor rod as claimed in claim 1, wherein a load bearing disc is arranged at the bottom end of the weight rod and used for carrying the weight body.
8. An in-situ test method for impact strength of an anchor rod according to any one of claims 1 to 7, wherein the image acquisition unit is a high-speed camera.
9. The in-situ test method for the impact strength of the anchor rod according to claim 1,
the step S1 specifically comprises the following steps: opening the electromagnetic chuck at the bottom end of the first tray body to enable the bottom end of the first tray body to be in close contact with the top end of the second tray body;
the step S2 specifically comprises the following steps: and closing the electromagnetic chuck to separate the first disk body from the second disk body, wherein the second disk body is driven by the counterweight rod and the counterweight body to freely fall.
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| CN116086752B (en) * | 2023-01-09 | 2024-05-07 | 中煤科工开采研究院有限公司 | Repeated impact resistance testing device and analysis method for anchor bolt support system |
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| DE102010040519B4 (en) * | 2010-09-09 | 2016-09-01 | Adolf Würth GmbH & Co. KG | Testing the strength of a connection between a substrate and a fastener inserted therein by means of a sacrificial element |
| ES2831610T3 (en) * | 2013-02-05 | 2021-06-09 | Sandvik Intellectual Property | Device, system and method for dynamic testing of ground support bolts, anchor bolts or rock bolts |
| CN104697736B (en) * | 2015-02-01 | 2017-04-05 | 山东科技大学 | Consider the anchor pole shock resistance test system and its application process of the interaction of supporting country rock |
| CN109668798A (en) * | 2018-07-13 | 2019-04-23 | 中国矿业大学(北京) | A kind of anchor pole shock resistance experimental apparatus for testing and method |
| CN110593953B (en) * | 2019-09-06 | 2020-11-06 | 绍兴文理学院 | Device and method for testing impact resistance characteristic of roadway support system under simulated rock burst condition |
| CN110530740B (en) * | 2019-09-19 | 2024-09-17 | 中国科学院武汉岩土力学研究所 | Impact test device and anchor rod impact test system |
| CN111189603A (en) * | 2020-02-10 | 2020-05-22 | 山东科技大学 | Roadway anchor rod axial impact resistance in-situ testing device and testing method |
| CN211954958U (en) * | 2020-03-20 | 2020-11-17 | 中国电建集团华东勘测设计研究院有限公司 | In-situ anchor rod drawing test device |
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