CN116399727A - Device and method for testing impact resistance of anchoring structure - Google Patents

Device and method for testing impact resistance of anchoring structure Download PDF

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Publication number
CN116399727A
CN116399727A CN202310068839.8A CN202310068839A CN116399727A CN 116399727 A CN116399727 A CN 116399727A CN 202310068839 A CN202310068839 A CN 202310068839A CN 116399727 A CN116399727 A CN 116399727A
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impact
anchoring structure
anchoring
impact resistance
testing
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李军臣
吴拥政
周鹏赫
付玉凯
孙卓越
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Ccteg Coal Mining Research Institute Co ltd
Tiandi Science and Technology Co Ltd
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Ccteg Coal Mining Research Institute Co ltd
Tiandi Science and Technology Co Ltd
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Priority to CN202310068839.8A priority Critical patent/CN116399727A/en
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0033—Weight
    • 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
    • G01N2203/0647—Image analysis
    • 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
    • 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
    • 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
    • G01N2203/0694—Temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/23—Dune restoration or creation; Cliff stabilisation

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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention provides an impact resistance testing device and method for an anchoring structure, wherein the device comprises the following components: the device comprises an impact device, an upper fixing sleeve, an impact sensing device and a receiving device; the impact device can apply an impact force to the anchoring structure; the anchoring structure comprises a pipe body and a tail pre-tightening structure; the pipe body is provided with a hollow area for anchoring body forming; the tail pre-tightening structure applies pre-tightening force to the anchoring body; the pipe wall of the pipe body is reserved with an opening; the sensing end of the impact sensing device is connected with the anchoring body, and the data transmission end of the impact sensing device is connected with the receiving device through the opening and is used for transmitting the monitored impact resistance test data of the anchoring structure to the receiving device so that the receiving device can determine the impact resistance of the anchoring structure according to the test data. The device can realize the matching research of the anchoring structure in the aspect of impact resistance, thereby providing basis for rock burst roadway support matching design and theoretical guidance for prestress conversion and action mechanism.

Description

Device and method for testing impact resistance of anchoring structure
Technical Field
The invention relates to the technical field of coal mine roadway support, in particular to an impact resistance testing device and an impact resistance testing method for an anchoring structure.
Background
Along with the continuous increase of coal mining intensity and mining depth in China, rock burst disasters become one of major disasters threatening the safe production of coal mines, and 86% of rock burst accidents are counted to occur in roadways. The rock burst prevention and control of the roadway is a key point of surrounding rock control, and the roadway anti-impact support is used as the last defense line for rock burst prevention and control of the roadway and mainly comprises rock burst roadway support prevention and control means such as high-strength anchor rod (rope) support, U-shaped shed and anti-impact support. The anchor rod (cable) of the rock burst roadway has the characteristics of high strength, high toughness, high elongation, good energy absorption effect and the like, and is a main supporting mode for controlling surrounding rock of the rock burst roadway at present. The anchor structure of the anchor rod (rope) support is convenient to construct, can apply larger pretightening force, effectively controls the deformation of surrounding rocks of the roadway, can realize real initiative and timely support by increasing pretightening force, improves the stress state of the top plate of the roadway, and realizes the high-resistance yielding of broken surrounding rocks. The prestress is converted into an anchoring body of the anchoring structure by the pretightening force and then is diffused into the surrounding rock to realize support, so that the bearing and anti-impact capacity of the surrounding rock can be fully mobilized. For rock burst roadway, the prestress anchoring structure is not only influenced by static load, but also disturbed by frequent dynamic load, the stress state of the anchoring structure in the static and dynamic stress process is researched, and the supporting action mechanism of the anchoring structure can be revealed.
Based on the deformation and damage characteristics of the prestress anchoring structure supporting matched rock burst roadway, domestic and foreign scientific researchers sequentially develop novel supporting 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 secure anchor rods, roofex anchor rods and the like, and the problem of deformation and damage of the rock burst roadway is relieved to a certain extent. However, when the rock burst occurs, the phenomena of partial anchor rod (cable) breakage and integral support failure can not be eliminated. Whether the anchoring structure support has effective anti-impact performance is determined by the combined action of various components in the anchoring structure, wherein the anti-impact performance is mainly determined by the elongation of the anchor rod body and the anti-impact property of the anchoring end, so that research on the anti-impact performance of the anchoring structure is an effective way for solving the problem of rock burst roadway support.
Disclosure of Invention
The invention provides an impact resistance testing device and an impact resistance testing method for an anchoring structure, which are used for solving the defect that the prior art lacks of the impact resistance testing research of the anchoring structure, and realizing the matching research of the anchoring structure on the aspect of impact resistance, thereby providing a basis for the matching design of rock burst roadway support and providing theoretical guidance for prestress conversion and action mechanism.
The invention provides an impact resistance testing device of an anchoring structure, which comprises: the device comprises an impact device, an upper fixing sleeve, an impact sensing device and a receiving device; the impact device is positioned above the anchoring structure and is used for applying impact force to the anchoring structure; the upper fixing sleeve is positioned above the anchoring structure and is fixedly connected with the anchoring structure, the anchoring structure comprises a pipe body and a tail pre-tightening structure, the pipe body is positioned above the tail pre-tightening structure and is fixedly connected with the tail pre-tightening structure, and the pipe body is provided with a hollow area for anchoring body forming; the tail pre-tightening structure is used for applying pre-tightening force to the anchoring body; an opening is reserved on the pipe wall of the pipe body; the sensing end of the impact sensing device is connected with the anchoring body, and the data transmission end of the impact sensing device is connected with the receiving device through the opening and used for transmitting the monitored impact resistance test data of the anchoring structure to the receiving device so that the receiving device can determine the impact resistance of the anchoring structure according to the impact resistance test data of the anchoring structure.
According to the impact resistance testing device for the anchoring structure, which is provided by the invention, the impact device comprises a motor, a chain and a hammer head, wherein the motor is connected with the hammer head through the chain.
According to the device for testing the shock resistance of the anchoring structure, provided by the invention, the top end of the pipe body is temporarily provided with the temporary sealing cap, and the temporary sealing cap is used for temporarily sealing the pipe body before the anchoring body is molded.
According to the device for testing the shock resistance of the anchoring structure, provided by the invention, the impact sensing device is one or a combination of more of a temperature sensor and a stress displacement sensor.
The invention provides an impact resistance testing device for an anchoring structure, which further comprises an image acquisition device, wherein the image acquisition device is in communication connection with a receiving device and is used for monitoring the damage characteristic of the anchoring structure in the impact process in real time.
The device for testing the shock resistance of the anchoring structure provided by the invention further comprises a velocimeter, wherein the velocimeter is in communication connection with the receiving device and is used for measuring the speed change of the impact device in the impact process.
According to the shock resistance testing device for the anchoring structure, the upper fixing sleeve is connected with the anchoring structure through the connecting piece with the adjustable inner diameter.
According to the impact resistance testing device of the anchoring structure, provided by the invention, the impact resistance testing device further comprises the cover body, wherein the cover body covers the outside of the anchoring structure and is used for preventing fragments generated by the impact device during impact resistance testing from splashing.
According to the shock resistance testing device for the anchoring structure, provided by the invention, the pipe body is provided with the detachable part, the detachable part can be detached to form the observation window on the pipe body during shock resistance testing, and the detachable part is fixed on the pipe body through the binding hoop for fixing the detachable part.
The invention also provides a testing method of the anchoring structure impact resistance testing device, which comprises the following steps: controlling the impact device to work to impact the anchoring structure, and opening the impact sensing device and the receiving device at the moment; monitoring and obtaining the impact resistance test data of the anchoring structure through the impact sensing device; and determining the shock resistance of the anchoring structure according to the received shock resistance test data of the anchoring structure by the receiving device.
The invention provides an impact resistance testing device and a testing method for an anchoring structure, wherein the impact resistance testing device for the anchoring structure comprises: the device comprises an impact device, an upper fixing sleeve, an impact sensing device and a receiving device; the impact device is positioned above the anchoring structure and is used for applying impact force to the anchoring structure; the upper fixing sleeve is positioned above the anchoring structure and is fixedly connected with the anchoring structure, the anchoring structure comprises a pipe body and a tail pre-tightening structure, the pipe body is positioned above the tail pre-tightening structure and is fixedly connected with the tail pre-tightening structure, and the pipe body is provided with a hollow area for anchoring body forming; the tail pre-tightening structure is used for applying pre-tightening force to the anchoring body; an opening is reserved on the pipe wall of the pipe body; the sensing end of the impact sensing device is connected with the anchoring body, and the data transmission end of the impact sensing device is connected with the receiving device through the opening and is used for transmitting the monitored impact resistance test data of the anchoring structure to the receiving device so that the receiving device can determine the impact resistance of the anchoring structure according to the impact resistance test data of the anchoring structure. The device can realize the matching research of the anchoring structure in the aspect of impact resistance, thereby providing basis for rock burst roadway support matching design and theoretical guidance for prestress conversion and action mechanism.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of an impact resistance testing device for an anchoring structure according to the present invention;
FIG. 2 is a schematic cross-sectional view of an anchoring structure according to the present invention;
fig. 3 is a schematic flow chart of a testing method of an impact resistance testing device for an anchoring structure.
Reference numerals:
1: an impact device; 101: a motor; 102: a chain; 103: a hammer head; 2: an upper fixing sleeve; 31: a temperature sensor; 32: a stress displacement sensor; 4: a receiving device; 5: a tube body; 61: a tray; 62: a nut; 7: temporarily sealing the cap; 8: an image acquisition device; 9: a velometer; 10: an inner diameter adjustable connector; 11: a cover body; 12: a detachable part; 13: a binding band for fixing the detachable part; 14: an anchor material; 15: anchor rods (cables); 16: and (5) opening holes.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The following describes an impact resistance testing device and an impact resistance testing method for an anchoring structure with reference to fig. 1 to 3.
Referring to fig. 1, fig. 1 is a schematic cross-sectional structure diagram of an impact resistance testing device with an anchoring structure according to the present invention.
The invention provides an impact resistance testing device of an anchoring structure, which comprises: the impact device 1, the upper fixing sleeve 2, the impact sensing device and the receiving device 4; wherein the impact device 1 is positioned above the anchoring structure and is used for applying impact force to the anchoring structure; the upper fixing sleeve 2 is positioned above the anchoring structure and fixedly connected with the anchoring structure, the anchoring structure comprises a pipe body 5 and a tail pre-tightening structure, the pipe body 5 is positioned above the tail pre-tightening structure and fixedly connected with the tail pre-tightening structure, and the pipe body 5 is provided with a hollow area for forming an anchoring body; the tail pre-tightening structure is used for applying pre-tightening force to the anchoring body; the pipe wall of the pipe body 5 is reserved with an opening 16; the sensing end of the impact sensing device is connected with the anchor body, and the data transmission end of the impact sensing device is connected with the receiving device 4 through the opening 16 and used for transmitting the monitored impact resistance test data of the anchoring structure to the receiving device 4 so that the receiving device 4 can determine the impact resistance of the anchoring structure according to the impact resistance test data of the anchoring structure.
Along with the continuous expansion of the depth and the range of coal exploitation, the dynamic disaster accidents associated with the coal exploitation are more serious, wherein the rock burst accidents are most prominent, and the safe and efficient exploitation of mines is severely restricted by three characteristics of easy occurrence, multiple occurrence and difficult prevention and control of the rock burst. The roadway anti-collision support is used as the last defense line for preventing and controlling the rock burst of the 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 life and property of the mining space is ensured. Rock burst refers to a dynamic phenomenon of sudden and violent damage of coal and rock mass in a coal mining space due to instantaneous release of elastic energy, and the damage process of the coal and rock mass is accompanied with the characteristics of vibration, ringing, air waves and the like. The research purpose of the anchor bolt support theory is to define the interaction relation between the anchor bolt and the surrounding rock, thereby providing a theoretical basis for the anchor bolt support design. The anchor body is mainly in the form of tunnel anchor bolt support, and consists of rock, anchor rods (ropes) 15, anchoring agent and the like. The existing method and device for testing the axial impact of the anchoring body are few, cannot meet the actual stress condition of the site, and cannot realize multi-angle system researches such as different impact energy, different impact speeds, different lithology, different types of anchor rods, different anchoring agents, different pretightening forces and the like. The scholars at home and abroad conduct a series of researches on the prestress anchoring structure, and the fact that the pretightening force of the anchor rods (ropes) 15 is widely considered to effectively control the deformation of surrounding rocks of a roadway is widely considered, the pretightening force is increased, real initiative and timely support can be achieved, the stress state of a top plate is improved, and high-resistance yielding of broken surrounding rocks is achieved. The prestress is converted into an anchoring body by pretightening force and then is diffused into surrounding rock to realize support. Therefore, the stress state of the anchoring body in the static and dynamic stress processes is studied, the supporting action mechanism of the anchoring structure can be revealed, and meanwhile, a proper anchoring mode and anchoring parameters can be selected to realize the optimal matching of the supporting parameters. The rock burst roadway anchor rod (cable) 15 is mainly used for resisting or reducing the instantaneous violent release of elastic energy, and the action principle is to slow down the release speed of the elastic energy of coal (rock), maintain the bearing capacity and absorb energy. The anchor rod (cable) 15 of the rock burst roadway is required to have the characteristics of high strength, high toughness, high elongation, good energy absorption effect and the like. Because of this high strength, injury events occur once the anchor fails or the anchor (rod) cable breaks, often resulting from unreasonable anchor structure design. In order to reduce the impact energy directly acting on the anchor (rod) cable, the anchor (rod) cable is not broken by deformation exceeding the maximum elongation, or the anchor body is excessively stressed to fail and break, so that the anchor body needs to disperse and reduce part of energy and the strength of the anchor body is ensured.
In order to achieve the above object, it is necessary to study the impact resistance of an anchoring structure formed by the anchor rod (rope) 15 and the anchoring body, such as the matching condition of the anchor rod (rope) 15 and the anchoring agent, the prestress loss and the conversion condition. For rock burst roadway, the dynamic load mechanical property of the anchoring structure is less studied at present, and the result can provide reference for reasonable design of the rock burst roadway supporting anchoring structure. According to the actual mine anchoring process, the invention provides an anchoring structure impact resistance testing device, which comprises: the impact device 1, the upper fixing sleeve 2, the impact sensing device and the receiving device 4; the anchoring structure comprises a pipe body 5 and a tail pre-tightening structure; the pipe body 5 is provided with a hollow area for anchoring body forming; the tail pre-tightening structure is used for applying pre-tightening force to the anchoring body; an opening 16 is reserved on the pipe wall of the pipe body 5, and the data transmission end of the impact sensing device is connected with the receiving device 4 through the opening 16. The impact device 1 applies impact force to the anchoring structure during the impact resistance test of the anchoring structure, the impact sensing device monitors impact test data, then the monitored impact resistance test data of the anchoring structure are transmitted to the receiving device 4, the receiving device 4 determines the impact resistance of the anchoring structure according to the received impact resistance test data of the anchoring structure, for example, impact energy absorption capacity, pretightening force loss condition, influence of an anchoring mode and adaptation condition of an anchor rod rope and an anchoring body of different anchoring parameters can be measured, thereby providing basis for supporting and matching design of rock burst roadway and providing theoretical guidance for prestress conversion and action mechanism.
In addition, the impact device 1 can be a drop hammer impact tester, the pipe body 5 can simulate actual drilling by using a steel pipe, the tail pre-tightening structure can comprise a tray 61 and a nut 62, the tail of the anchor rod (rope) 15 is pre-tightened by the tray 61 and the nut 62, the pre-tightening force is directly contacted with the steel pipe by the tray 61 and finally acts on the anchoring structure, the adjusting mode is simple and convenient, the nut 62 can be a high-strength nut 62, and the performance is stable; the impact sensing device can be a sensor, the receiving device 4 can be a terminal device, the collected test data can be analyzed and arranged, for example, according to the displacement change of an anchoring end anchor rod (rope) 15 and the change of the anchoring body temperature, the energy condition of the extension absorption of the anchor rod (rope) 15 and the energy condition of the absorption of the anchoring body in the impact process can be obtained, and the impact resistance and the support matching parameters of an anchoring system are obtained; the impact sensing device and the receiving device 4 may be electrically connected through a signal transmission line, one end of which goes deep into the tube body 5 and is electrically connected to the impact sensing device, and the other end of which is electrically connected to the receiving device 4, which is not particularly limited herein.
In conclusion, the impact resistance testing device for the anchoring structure can realize the matching research of the anchoring structure in the aspect of impact resistance, thereby providing basis for the rock burst roadway support matching design and also providing theoretical guidance for prestress conversion and action mechanism.
Based on the above embodiments:
referring to fig. 2, fig. 2 is a schematic cross-sectional structure of an anchoring structure according to the present invention.
As a preferred embodiment, the impact device 1 comprises a motor 101, a chain 102 and a hammer head 103, the motor 101 being connected to the hammer head 103 by the chain 102.
In this embodiment, the impact device 1 may include a motor 101, a chain 102 and a hammer 103, before the impact resistance test of the anchoring structure starts, the motor 101 starts to work, the chain 102 is pulled tightly, the hammer 103 is lifted to a preset height, that is, the anchoring structure does not bear the impact force, when the impact resistance test of the anchoring structure starts, the motor 101 stops working, the chain 102 is in a loose state, the hammer 103 falls in a free falling form to impact the anchoring structure, for example, the tray 61 can be impacted, thereby realizing the impact resistance test of the anchoring structure, and the adjustment mode is simple and convenient.
As a preferred embodiment, the top end of the tube body 5 is temporarily provided with a temporary capping cap 7 for temporarily capping before the anchor body is formed.
In order to enable the formation of the anchoring body, in this embodiment, the top end of the pipe body 5 is temporarily capped with an anchoring temporary capping cap 7, after which the anchoring agent may be fed into the anchoring position with an anchor rod (rope) 15, the anchoring agent is rotationally mixed with a drill, and after the anchoring agent is solidified, the temporary capping cap 7 is removed, whereby the formation of the anchoring body can be achieved.
In addition, the non-anchored end of the anchor rod (cable) 15 may be wrapped with a length of PVC (Polyvinyl chloride ) material to prevent the anchoring agent from adhering to the free end of the anchor rod (cable) 15, which is not particularly limited herein.
As a preferred embodiment, the impact sensing means is a combination of one or more of a temperature sensor 31, a stress displacement sensor 32.
In this embodiment, the impact sensing device may be one or more of a combination of a temperature sensor 31 and a stress displacement sensor 32, specifically, the temperature sensor 31 may sense the temperature of the anchoring material 14 and convert the temperature into an available output temperature signal, the stress displacement sensor 32 may monitor physical mechanical parameters of the anchoring body in the pre-tightening process and the impact process, such as impact stress/strain and impact displacement, convert the monitored parameters into an available output stress signal and displacement signal, and transmit the available output stress signal and displacement signal to the receiving device 4, analyze and sort the collected data, and according to the displacement change of the anchoring end anchor rod (cable) 15 and the energy absorbed by the anchoring body in the impact process, obtain the impact resistance and support matching parameters of the anchoring system, thereby providing a data base for more comprehensively knowing and grasping the impact resistance of the anchoring structure and providing guidance for the support design of the ground tunnel anchor rod.
In addition, after the anchoring agent is solidified, holes may be punched in the anchoring body, the stress displacement sensor 32, the temperature sensor 31, the spray digital speckles are installed, and the strain gauge is also stuck to the anchoring tip, which is not particularly limited herein.
Of course, in order to monitor the stress/strain condition of the end of the anchor (rod) cable, a strain gauge may be attached to the tail of the anchor rod (cable) 15 for monitoring, and the present application is not particularly limited herein.
As a preferred embodiment, the device further comprises an image acquisition device 8, wherein the image acquisition device 8 is in communication connection with the receiving device 4 for monitoring the failure characteristics of the anchoring structure during impact in real time.
In the anchor rod impact process, the anchor rod may be pulled out and damaged, the damage characteristic of the anchor rod may be monitored in real time by the image acquisition unit, and the obtained damage characteristic data is transmitted to the receiving device 4, so that the receiving device 4 determines the impact resistance of the anchor structure according to the damage characteristic data, thereby providing a data basis for more comprehensively knowing and grasping the impact resistance of the anchor structure, and providing guidance for the ground roadway anchor rod support design.
The image acquisition device 8 may be a high-speed camera or an infrared camera, and the infrared camera may also be used for measuring temperature data of the surface of the anchoring structure, which is not particularly limited herein.
As a preferred embodiment, a tachometer 9 is also included, the tachometer 9 being in communication with the receiving means 4 for measuring the speed change of the percussion device 1 during the impact.
In order to measure the speed change of the impact device 1 in the impact process, in this embodiment, the impact resistance testing device of the anchoring structure further comprises a velocimeter 9, the velocimeter 9 can be arranged at the bottom of the anchoring structure, for example, in a specific test, the hammer 103 is lifted to impact energy height, free falling impact experiments are carried out, the speed change of the hammer 103 in the impact process is recorded through the bottom velocimeter 9, and the total absorption energy of the anchoring structure is obtained through calculation, so that the impact resistance test of the anchoring structure can be realized, the test data is more accurate and comprehensive, people can better master the anchoring performance of the coal rock mass, and in turn, the design anchor rod, the support system, the pretightening force of the more reasonable design anchor rod and the like are improved, and the anchor rod support design level is improved.
As a preferred embodiment, the upper fixing sleeve 2 is connected to the anchoring structure by means of an inner diameter adjustable connection 10.
In order to realize stable connection of the upper fixing sleeve 2 and the anchoring structure, in this embodiment, the upper fixing sleeve 2 and the anchoring structure may be connected by a connecting piece 10 with an adjustable inner diameter, specifically, a threaded section may be disposed on a pipe body 5 of the anchoring structure, a threaded section may also be disposed on the upper fixing sleeve 2, and the inner diameter of the connecting piece is designed according to the actual anchor cable drilling diameter, for example, an anchor cable with a diameter of phi 17.8mm is adapted to an anchor cable with a diameter of phi 33mm, so that the method has higher practicability.
As a preferred embodiment, the device further comprises a cover 11, wherein the cover 11 covers the outside of the anchoring structure for preventing fragments generated by the anchoring structure during impact resistance test from splashing.
In order to prevent fragments generated by the anchoring structure during impact resistance testing from splashing, in the embodiment, the impact resistance testing device of the anchoring structure can further comprise a cover body 11, the cover body 11 is covered outside the anchoring structure, and the fragments generated by the anchoring structure during impact resistance testing can be prevented from splashing, so that the device is simple and convenient to install and high in reliability.
The cover 11 may be a plastic cover, and is not particularly limited herein.
As a preferred embodiment, the tube body 5 is provided with a detachable part 12, the detachable part 12 being detachable to form an observation window on the tube body 5 at the time of impact resistance test, the detachable part 12 being fixed to the tube body 5 by a binding band 13 to which the detachable part is fixed.
In order to facilitate observation of the impact condition of the anchoring structure in the impact resistance test process, in this embodiment, the detachable portion 12 may be disposed on the pipe body 5 of the anchoring structure, the detachable portion 12 may be detached during the impact resistance test to form an observation window on the pipe body 5, and the impact condition of the anchoring structure in the impact resistance test process may be clearly known through the observation window, for example, whether the anchoring agent is intact or not may be judged, the flexibility is relatively strong, and in addition, the detachable portion 12 is fixed on the pipe body 5 by the binding hoop 13 for fixing the detachable portion.
Referring to fig. 3, fig. 3 is a flow chart of a testing method of an impact resistance testing device for an anchoring structure according to the present invention.
The invention also provides a testing method of the above anchoring structure impact resistance testing device, comprising the following steps:
301: the impact device 1 is controlled to work to impact the anchoring structure, and the impact sensing device and the receiving device 4 are opened at the moment;
302: monitoring and obtaining the impact resistance test data of the anchoring structure through an impact sensing device;
303: the impact resistance of the anchoring structure is determined by the receiving means 4 from the received impact resistance test data of the anchoring structure.
The invention also provides a testing method of the anchoring structure impact resistance testing device, which comprises the steps of firstly controlling the impact device 1 to work, impacting the anchoring structure, opening the impact sensing device to monitor the impact resistance testing data of the anchoring structure, opening the receiving device 4 to receive the impact resistance testing data of the anchoring structure and determine the impact resistance of the anchoring structure according to the impact resistance testing data of the anchoring structure, realizing the matching research of the anchoring structure in terms of impact resistance, realizing the impact resistance experiments of the anchoring structures with different anchoring lengths, different anchoring materials 14, different anchoring modes, different pretightening force, different types and types of anchor rods (ropes) 15, obtaining the impact force-temperature change curve inside the anchoring body, the pretightening force-temperature change curve, the impact force-time curve of the anchoring ends and the free ends of the anchor rods (ropes) 15 and the dynamic damage process of the anchor DIC, realizing the prestress loss condition, and the matching research of the anchor rods (ropes) 15 and the impact condition, thereby providing theoretical basis and practical engineering guidance for the whole support design performance, and realizing more reasonable and practical engineering guidance.
For the description of the method for testing the impact resistance testing device of the anchoring structure provided by the invention, please refer to the embodiment of the device, and the description of the method is omitted herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. An impact resistance testing device for an anchoring structure, comprising: the device comprises an impact device, an upper fixing sleeve, an impact sensing device and a receiving device; wherein,,
the impact device is positioned above the anchoring structure and is used for applying impact force to the anchoring structure;
the upper fixing sleeve is positioned above the anchoring structure and is fixedly connected with the anchoring structure, the anchoring structure comprises a pipe body and a tail pre-tightening structure, the pipe body is positioned above the tail pre-tightening structure and is fixedly connected with the tail pre-tightening structure, and the pipe body is provided with a hollow area for anchoring body forming; the tail pre-tightening structure is used for applying pre-tightening force to the anchoring body; an opening is reserved on the pipe wall of the pipe body;
the sensing end of the impact sensing device is connected with the anchoring body, and the data transmission end of the impact sensing device is connected with the receiving device through the opening and is used for transmitting the monitored impact resistance test data of the anchoring structure to the receiving device so that the receiving device can determine the impact resistance of the anchoring structure according to the impact resistance test data of the anchoring structure.
2. The device for testing the impact resistance of an anchoring structure according to claim 1, wherein the impact device comprises a motor, a chain and a hammer head, and the motor is connected with the hammer head through the chain.
3. The device for testing the shock resistance of an anchoring structure according to claim 1, wherein the top end of the tube body is temporarily provided with a temporary capping cap for temporarily capping before the anchoring body is molded.
4. The device for testing the impact resistance of an anchoring structure according to claim 1, wherein the impact sensing device is one or a combination of a temperature sensor and a stress displacement sensor.
5. The device for testing the impact resistance of an anchoring structure according to claim 1, further comprising an image acquisition device in communication with the receiving device for monitoring the failure characteristics of the anchoring structure during impact in real time.
6. The device for testing the impact resistance of an anchoring structure according to claim 1, further comprising a velocimeter in communication with said receiving means for measuring the change in speed of said impact means during impact.
7. The device for testing the impact resistance of an anchoring structure according to claim 1, wherein the upper fixing sleeve is connected with the anchoring structure by a connecting piece with an adjustable inner diameter.
8. The impact resistance testing device of an anchoring structure according to claim 1, further comprising a cover body covering the outside of the anchoring structure for preventing fragments generated by the anchoring structure at the time of impact resistance testing from splashing.
9. The device for testing the impact resistance of an anchoring structure according to any one of claims 1 to 8, wherein the pipe body is provided with a detachable portion which is detachable to form an observation window on the pipe body at the time of the impact resistance test, and the detachable portion is fixed to the pipe body by a binding band for fixing the detachable portion.
10. A method of testing an impact resistance testing device for an anchor structure according to any one of claims 1 to 9, comprising:
controlling the impact device to work to impact the anchoring structure, and opening the impact sensing device and the receiving device at the moment;
monitoring and obtaining shock resistance test data of the anchoring structure through the impact sensing device;
and determining the shock resistance of the anchoring structure according to the received shock resistance test data of the anchoring structure by the receiving device.
CN202310068839.8A 2023-01-16 2023-01-16 Device and method for testing impact resistance of anchoring structure Pending CN116399727A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310068839.8A CN116399727A (en) 2023-01-16 2023-01-16 Device and method for testing impact resistance of anchoring structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310068839.8A CN116399727A (en) 2023-01-16 2023-01-16 Device and method for testing impact resistance of anchoring structure

Publications (1)

Publication Number Publication Date
CN116399727A true CN116399727A (en) 2023-07-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310068839.8A Pending CN116399727A (en) 2023-01-16 2023-01-16 Device and method for testing impact resistance of anchoring structure

Country Status (1)

Country Link
CN (1) CN116399727A (en)

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