CN115406765B - Mechanical property test system and method for underground engineering protective net - Google Patents
Mechanical property test system and method for underground engineering protective net Download PDFInfo
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- CN115406765B CN115406765B CN202211352633.XA CN202211352633A CN115406765B CN 115406765 B CN115406765 B CN 115406765B CN 202211352633 A CN202211352633 A CN 202211352633A CN 115406765 B CN115406765 B CN 115406765B
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G01M13/00—Testing of machine parts
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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Abstract
The invention relates to the technical field of underground engineering support of coal mines and the like, in particular to a system and a method for testing mechanical properties of an underground engineering protective net. The invention provides a mechanical property test system for an underground engineering protective net, which comprises a supporting device, a tensile test device and a rock coupling effect test device, wherein the supporting device comprises a supporting part and a movable part; at least one tensile test device is configured to perform tensile test on the protection net; the rock coupling effect testing device is configured to perform rock coupling effect testing on the protective net. The mechanical property test system and method for the underground engineering protection net are used for perfecting the test mode of the mechanical property of the protection net, effectively testing the comprehensive mechanical property of the protection net and guiding the reasonable design of the parameters of the underground engineering protection net.
Description
Technical Field
The invention relates to the technical field of underground engineering protection such as coal mines and the like, in particular to a system and a method for testing mechanical property of an underground engineering protection net.
Background
Underground engineering protective nets (or protective nets) are widely used as important protective structures in underground engineering protection due to safety and reliability. With the development of underground space, especially coal mine engineering, the mining depth and the mining difficulty are increasingly increased, the underground environment becomes more complex, and higher requirements are provided for the mechanical property of the protective net. The effect that present protection network played is more and more extensive, not only can turn into the point protection of underground protective material to face protection, effectively restrain droing of country rock, and some protection networks have still had the energy-absorbing ability moreover.
In the coal mining process, the protective net is in a dynamic and static load coupling mechanical state due to the influence of different factors such as ground stress, construction load, blasting impact force, fault slip and the like. Meanwhile, the protective net is used as an important component of a protective system, and the interaction rule and the mechanical property test of the protective net and rocks are particularly important.
However, the existing system and method for testing mechanical properties of a protective net mainly have the following problems:
1. the existing mechanical property test system for the protective net is mostly concentrated on single static load or single dynamic load test, and the condition of coupling of the static load and the dynamic load is not considered.
2. The existing mechanical property test system for the protective net only performs load test in a single direction, does not comprehensively consider the load condition in a plurality of different directions, and simultaneously lacks the mechanical property test under the coupling effect with a rock mass.
Disclosure of Invention
The invention aims to provide a system and a method for testing mechanical properties of a protective net of an underground engineering, which are used for enriching the test modes of the mechanical properties of the protective net and effectively testing the comprehensive mechanical properties of the protective net.
The above object of the present invention can be achieved by the following technical solutions:
the invention provides a mechanical property test system for a protective net of an underground engineering, which comprises:
the supporting device comprises a supporting part and a movable part, the movable part is movably connected with the supporting part, the protective net is arranged on the movable part, and the movable part is configured to drive the protective net to move between a tensile testing position and a rock testing position;
at least one tensile test device configured to perform a tensile test on the protection network in a state where the protection network is located at a tensile test position;
and the rock coupling effect testing device is configured to test the rock coupling effect of the protective net under the condition that the protective net is positioned at the rock testing position.
In an embodiment of the invention, the movable member is rotatably connected to the support member, and the movable member is configured to rotate the protection net between the tensile test position and the rock test position.
In an embodiment of the present invention, the supporting device further includes a rotating rod, the rotating rod is disposed through the supporting member from outside to inside via the outer circumferential wall of the supporting member, the movable member is rotatably connected to the inside of the supporting member via the rotating rod,
underground works protection network mechanical properties test system still includes rotates drive arrangement, and the output that rotates drive arrangement connects with the outer end of dwang, and wherein, under the state that the protection network is located the tensile test position, the protection network is horizontal setting, and under the state that the protection network is located the rock test position, the protection network is vertical setting.
In an embodiment of the present invention, the rock coupling test apparatus includes a crushed stone load test part located at a front side of the support part, the crushed stone load test part being configured to release crushed stones to a surface of the protection net in a state where the protection net is located at the rock test position.
In an embodiment of the present invention, a gravel load testing component comprises:
the stone storage piece is provided with a stone storage inner cavity;
the gas storage piece comprises a gas storage part and a gas pump, the gas storage part is provided with a gas storage inner cavity, and the gas storage inner cavity is communicated with the stone storage inner cavity; the air pump is communicated with the air storage inner cavity and is configured to release the broken stones in the stone storage inner cavity to the surface of the protective net.
In an embodiment of the present invention, the rock coupling test apparatus further includes a complete rock load test part located at a rear side of the support part, the complete rock load test part including a pendulum supporter located at a front side of the support part and a pendulum rotatably disposed at an upper portion of the support part so that the pendulum swings backward and forward with respect to the pendulum supporter, the pendulum applying a load to a surface of the protection net in a state where the protection net is located at the rock test position.
In an embodiment of the invention, the device further comprises a double-acting hydraulic cylinder arranged at the rear part of the supporting part, the double-acting hydraulic cylinder comprises a contact plate pushing piston rod extending from front to back, the contact plate pushing piston rod is provided with a contact plate at the front end, the swinging of the pendulum bob pushes the contact plate to push the rear end of the piston rod to move forwards, so that the contact plate applies load to the surface of the protective net, and the dynamic and static rock load test is realized.
In the embodiment of the invention, four tensile testing devices are arranged at the upper end of the movable part at uniform intervals along the circumferential direction of the supporting part and are positioned at the periphery of the protective net, so that the planar unidirectional load test and the planar bidirectional load test of the protective net are realized;
tensile testing arrangement includes rectilinear motion structure and protection network anchor clamps, and the rectilinear motion structure sets up in the upper end of movable part, and the protection network anchor clamps are located the inboard of rectilinear motion structure to meet with the output of rectilinear motion structure, the protection network anchor clamps centre gripping is in the protection network so that the protection network is installed in movable part.
In an embodiment of the present invention, the linear motion structure includes a driving hydraulic cylinder and a servo valve, the driving hydraulic cylinder being disposed at an upper end of the movable member; the servo valve is arranged on the driving hydraulic cylinder and is configured to control the oil inlet amount of the driving hydraulic cylinder so as to enable the stretching piston rod of the driving hydraulic cylinder to carry out impact motion and realize plane unidirectional and bidirectional stretching dynamic and static load tests;
the mechanical property test system for the underground engineering protective net further comprises a displacement sensor which is arranged on the stretching piston rod to detect the deformation quantity of the protective net.
The invention provides a mechanical property test method for an underground engineering protection net, which is based on the mechanical property test system for the underground engineering protection net and comprises the following steps:
clamping the edge of the protective net by a plurality of protective net clamps so that the protective net is arranged on the movable part;
placing the protective net at a tensile test position, and stretching the protective net through a tensile test device to perform tensile test on the protective net;
adjusting the position of the movable part to enable the protective net to be located at a rock testing position;
carrying out rock coupling effect test on the protective net by using a rock coupling effect test device;
so as to complete the tensile test and rock coupling test of the protective net.
The mechanical property test system and method for the underground engineering protective net has the characteristics and advantages that:
in a specific application, the mechanical property test system of the underground engineering protection net can not only carry out tensile test on the protection net installed on the movable part, but also carry out rock coupling test on the protection net installed on the movable part, so that the test mode of the mechanical property of the protection net can be enriched, and the comprehensive mechanical property of the protection net can be effectively tested.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic perspective view of a mechanical property testing system for an underground engineering protection net according to the present invention, and the protection net is not shown in the figure.
Fig. 2 is a schematic perspective view of the mechanical property test system for the underground engineering protection net of the present invention, wherein the protection net is located at a tensile test position.
Fig. 3 is a schematic perspective view of the mechanical property test system for the underground engineering protection net of the invention, wherein the protection net is located at a rock test position, and the pendulum bob is in a swinging process.
FIG. 4 is a schematic view of a gravel load test assembly of the present invention.
FIG. 5 is a schematic view of a tensile testing apparatus of the present invention.
Reference numerals and description:
1. a support device; 11. a support member; 12. a movable part; 13. rotating the rod; 2. a tensile testing device; 21. a linear motion structure; 211. driving the hydraulic cylinder; 2111. stretching the piston rod; 212. a servo valve; 22. a protective net clamp; 221. a first arc-shaped plate; 222. a second arc-shaped plate; 3. a rock coupling effect testing device; 31. a gravel load testing component; 311. a stone storage member; 312. a gas storage member; 3121. a gas storage part; 3122. an air pump; 3123. an air control valve; 32. a complete rock load test part; 321. a pendulum support; 322. a pendulum bob; 4. a double-acting hydraulic cylinder; 41. the contact plate pushes the piston rod; 5. a contact plate; 6. and a displacement sensor.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.
Implementation mode one
As shown in fig. 1 to 5, the invention provides a mechanical property test system for a protective net of an underground engineering, which includes a supporting device 1, at least one tensile test device 2 and a rock coupling test device 3, where the supporting device 1 includes a supporting part 11 and a movable part 12, the movable part 12 is movably connected to the supporting part 11, the protective net is installed on the movable part 12, and the movable part 12 is configured to drive the protective net to move between a tensile test position and a rock test position; in a state where the protection net is located at the tensile test position, at least one tensile test device 2 is configured to perform tensile test on the protection net; the rock coupling test device 3 is configured to perform a rock coupling test on the protection net in a state where the protection net is located at a rock test position.
In a specific application, the mechanical property test system of the underground engineering protection net can not only carry out tensile test on the protection net installed on the movable part 12, but also carry out rock coupling test on the protection net installed on the movable part 12, so that test modes of mechanical properties of the protection net can be enriched, and comprehensive mechanical properties of the protection net can be effectively tested.
Specifically, four tensile test devices 2 are provided, and the four tensile test devices 2 are uniformly arranged at the upper end of the movable part 12 along the circumferential direction of the supporting part 11 at intervals and are located at the periphery of the protection net, so that the planar unidirectional load test and the planar bidirectional load test of the protection net are realized.
More specifically, tensile testing arrangement 2 includes rectilinear motion structure 21 and protection network anchor clamps 22, rectilinear motion structure 21 sets up in the upper end of movable part 12, protection network anchor clamps 22 are located rectilinear motion structure 21's inboard to meet with rectilinear motion structure 21's output, protection network anchor clamps 22 centre gripping is in the protection network so that the protection network is installed in movable part 12, in concrete application, accessible protection network anchor clamps 22 clip the protection network, and utilize rectilinear motion structure 21 to drive protection network anchor clamps 22 and do rectilinear motion, realize the plane tensile test of protection network. In some embodiments, the tensile test and the rock coupling test of the protection net may also be simultaneously performed in a state where the protection net is located at the rock testing position.
In the present embodiment, the linear motion mechanism 21 includes a driving hydraulic cylinder 211 and a servo valve 212, the driving hydraulic cylinder 211 being provided at the upper end of the movable member 12; the servo valve 212 is disposed at the driving hydraulic cylinder 211, for example, the servo valve 212 is disposed at the upper end of the driving hydraulic cylinder 211, and is configured to control the oil inlet amount of the driving hydraulic cylinder 211, so that the tensile piston rod 2111 of the driving hydraulic cylinder 211 performs an impact motion, and a plane unidirectional load test and a plane bidirectional load test of the protection net are implemented.
Further, the mechanical property test system for the underground engineering protection net can further comprise a displacement sensor 6 which is arranged on the extension piston rod 2111 to detect the deformation amount of the protection net.
In an embodiment of the present invention, as shown in fig. 2 and 3, the movable part 12 is rotatably connected to the supporting part 11, and the movable part 12 is configured to drive the protection net to rotate between the tensile testing position and the rock testing position, so that the space occupation of the mechanical performance testing system of the protection net of the underground engineering can be reduced, and the mechanical performance test of the protection net can be conveniently completed in a laboratory environment.
Specifically, strutting arrangement 1 still can include dwang 13, dwang 13 is worn to locate support element 11 through support element 11's periphery wall from outer to inner, movable part 12 passes through dwang 13 rotatable coupling in support element 11, underground works protection network mechanical properties test system still includes and rotates drive arrangement, the output that rotates drive arrangement meets with the outer end of dwang 13, wherein, under the state that the protection network is located tensile test position, the protection network is horizontal (is flat state) setting, under the state that the protection network is located rock test position, the protection network is vertical (is vertical state) setting.
In a specific application, the plane unidirectional load test may include a plane unidirectional static load test and a plane unidirectional dynamic load test, and the plane bidirectional load test may include a plane bidirectional static load test and a plane bidirectional dynamic load test, and specifically, the plane unidirectional dynamic load test and the plane bidirectional dynamic load test may be implemented by the tensile test apparatus 2, for example, when the plane unidirectional dynamic load test is performed, two edges of a protection net are relatively clamped by a pair of protection net clamps 22 (or may be called a movable clamping end), the protection net clamps 22 are connected with tensile piston rods 2111, so that the protection net is fixed to the movable component 12, and at the same time, the motor may be used to drive the rotating rod 13 to rotate, so that the movable component 12 is in a flat state (the protection net is transversely arranged), that is, the protection net is located at a tensile test position, and then the hydraulic oil pump is used to inject oil into the cylinder body of the driving hydraulic cylinder 211 to provide a certain static force, the protection net is stretched, after the static force reaches a certain value, high-pressure oil is continuously injected into the cylinder body, and the servo valve is controlled to generate high-speed impact motion, so as to provide a certain power, and the displacement sensor 6 is used to record relevant data of the plane unidirectional dynamic and static load tests are completed; when a planar bidirectional dynamic and static load test is performed, two edges of a protection net can be relatively clamped through a pair of protection net clamps 22 (or can be called as movable clamping ends), the protection net clamps 22 are connected with a stretching piston rod 2111, so that the protection net is fixed on the movable part 12, meanwhile, a motor can be used for driving the rotating rod 13 to rotate, so that the movable part 12 is in a flat state (the protection net is transversely arranged), a hydraulic oil pump is used for injecting oil into the cylinder bodies of the four driving hydraulic cylinders 211 by using the same method, a certain static force is provided, the protection net is stretched, high-pressure oil is continuously injected into the cylinder bodies after the static force reaches a certain value, a high-speed impact motion is generated by controlling the servo valve 212, a certain power is provided, and a displacement sensor 6 is used for recording relevant experimental data, so that the planar bidirectional dynamic and static load test is completed.
In some embodiments, as shown in fig. 3, the protection net clamp 22 may include a first arc-shaped plate 221, a second arc-shaped plate 222, and a fastener, where the first arc-shaped plate 221 and the second arc-shaped plate 222 are disposed up and down and have a distance, and both the first arc-shaped plate 221 and the second arc-shaped plate 222 are disposed concentrically with the protection net, the fastener penetrates through the first arc-shaped plate 221 and the second arc-shaped plate 222, and the fastener is configured to adjust the distance, and through the above arrangement, the edge of the protection net may be more clamped by the protection net clamp 22.
In one embodiment of the present invention, the rock coupling test device 3 includes a crushed stone load test component 31, the crushed stone load test component 31 is located at the front side of the support component 11, and in a state that the protection net is located at the rock test position, the crushed stone load test component 31 is configured to release crushed stones to the surface of the protection net, and in a specific application, the crushed stones can be used to apply a load to the surface of the protection net, so as to implement a dynamic load test (rock coupling test) on the protection net.
Specifically, the gravel load testing part 31 may include a stone storage part 311 and a gas storage part 312, the stone storage part 311 having a stone storage cavity; the gas storage component 312 comprises a gas storage portion 3121 and a gas pump 3122, the gas storage portion 3121 has a gas storage inner cavity, and the gas storage inner cavity is communicated with the stone storage inner cavity; the air pump 3122 is communicated with gas storage inner chamber, configures into the surface of release storage stone inner chamber to the protection network, in concrete application, can place the rubble in storage stone inner chamber, when the air pump 3122 is opened, releases the rubble in the storage stone inner chamber in the protection network, utilizes the rubble to exert the load to the surface of protection network, realizes the rubble coupling load test to the protection network. In some embodiments, an air control valve 3123 is further disposed between the air storage lumen and the stone storage lumen.
In specific application, when a gravel coupling load test is performed, the rotating rod 13 can be driven by the motor to rotate, so that the movable part 12 is in a vertical state (the protective net is longitudinally arranged), namely, the protective net is located at a rock test position and faces towards the gravel load test part 31, then high-pressure gas is injected into the gas storage inner cavity by the gas pump 3122, the air control valve 3123 is in a closed state, after the gas pressure reaches a certain value, the air control valve 3123 can be opened, and meanwhile, the inner cavity of the gravel storage is opened, so that complete rocks or gravel in the inner cavity of the gravel storage impact on the protective net, and the complete rock coupling load test or the gravel coupling load test is completed.
In one embodiment of the present invention, the rock coupling test device 3 further includes a complete rock load test part 32 located at the rear side of the support part 11, the complete rock load test part 32 includes a pendulum supporter 321 and a pendulum 322, the pendulum supporter 321 is located at the front side of the support part 11, the pendulum 322 is rotatably disposed at the upper portion of the support part 11, so that the pendulum 322 swings forward from the rear direction with respect to the pendulum supporter 321, and in a state where the protection net is located at the rock test position, the pendulum 322 applies a load to the surface of the protection net, thereby simulating complete rocks to implement a load test on the protection net.
Specifically, the complete rock load test member 32 may include a pendulum supporter 321 and a pendulum 322, the pendulum supporter 321 being located at a front side of the support member 11, and the pendulum 322 being rotatably disposed at an upper portion of the support member 11 such that the pendulum 322 swings backward and forward with respect to the pendulum supporter 321 to apply a load to a surface of the protection net.
More specifically, the mechanical property test system for the underground engineering protective net further comprises a double-acting hydraulic cylinder 4 (or may be called a hollow hydraulic cylinder) arranged at the rear part of the supporting part 11, the double-acting hydraulic cylinder 4 comprises a contact plate pushing piston rod 41 (or may be called a push rod) extending from front to back, the contact plate pushing the front end of the piston rod 41 is provided with a contact plate 5, the swinging of the pendulum bob 322 pushes the contact plate to push the rear end of the piston rod 41 to move forward, so that the contact plate 5 applies a load to the surface of the protective net, thereby realizing a rock dynamic and static load test, in specific application, the normal dynamic and static load test of the protective net can be realized, for example, the contact plate of the double-acting hydraulic cylinder 4 can only push the contact plate to push the piston rod 41 to move at a constant speed, so that a static load is applied to the surface of the protective net through the contact plate 5, or the contact plate can push the piston rod 41 to be matched with the double-acting hydraulic cylinder 4, and apply a dynamic load to the surface of the protective net through the contact plate 5; that is, when the bob 322 does not swing, a static load may be applied to the surface of the protection net using the contact plate 5 only by opening the hollow hydraulic cylinder; when the pendulum 322 swings, the pendulum 322 swings backward and forward relative to the pendulum support 321 to push the contact plate to push the rear end of the piston rod 41 to move forward, so as to apply a dynamic load to the surface of the protection net through the contact plate 5, so as to achieve a normal dynamic and static load test of the protection net.
In concrete application, when carrying out normal direction sound load test, usable motor drives dwang 13 and rotates, make movable part 12 be in vertical state (the protection network is vertical setting), that is, the protection network is located the rock test position, then utilize hydraulic oil pump to the oiling in the cylinder body of two effect pneumatic cylinder 4, provide certain quiet power, promote the transmission effect of piston rod 41 through the contact plate, transmit quiet power to contact plate 5, compress the protection network, treat that the amount of deflection reaches certain numerical value after, control pendulum 322 is the body that falls downwards, promote piston rod 41 through the contact plate and transmit on contact plate 5, in order to produce certain dynamic load to the protection network, and record relevant experimental data, accomplish normal direction sound load test.
Second embodiment
As shown in fig. 1 to 5, the present invention further provides a mechanical property test method for an underground engineering protection net, where the mechanical property test method for the underground engineering protection net is based on the mechanical property test system for the underground engineering protection net of the first embodiment, and the mechanical property test method for the underground engineering protection net includes:
the edges of the protection net are clamped by a plurality of protection net clamps 22 so that the protection net is mounted on the movable part 12;
placing the protective net at a tensile test position, and stretching the protective net through the tensile test device 2 to perform tensile test on the protective net;
adjusting the position of the movable part 12 to enable the protective net to be positioned at a rock testing position;
carrying out rock coupling effect test on the protective net by using the rock coupling effect test device 3;
so as to complete the tensile test and the rock coupling test of the protective net.
The working principle and the beneficial effect of the method for testing the mechanical property of the underground engineering protection net are the same as those of the first embodiment, and are not described herein again.
In some embodiments, the mechanical property test method for the underground engineering protection net provided by the invention can comprise the following steps:
unfolding a plane one-way dynamic and static load tensile test, namely, carrying out the plane one-way static load test and the plane one-way dynamic load test;
carrying out plane bidirectional dynamic and static load tensile test, namely carrying out the plane bidirectional static load test and the plane bidirectional dynamic load test;
carrying out normal dynamic and static load compression test, namely carrying out the normal dynamic and static load test;
carrying out dynamic load impact test under the rock coupling effect, namely carrying out the rock coupling effect test;
comprehensive evaluation is carried out on the mechanical property of the protective net based on the mechanical property test method of the underground engineering protective net.
The mechanical property test system and method for the underground engineering protective net provided by the invention are characterized in that the load is applied to the protective net in the following three ways to realize the comprehensive mechanical property test of the protective net: for example, in a plane dynamic and static load test (tensile test), a certain static force can be provided by driving the hydraulic cylinder 211 to stretch the protective net, and when the static force reaches a certain value, high-pressure oil can be injected to control the servo valve 212 to realize impact motion to apply power; in a normal dynamic and static load compression test, a certain static force can be provided through the hollow hydraulic oil cylinder, and when the static force reaches a certain value, power is transmitted to the protective net through the contact plate 5 (or called an impact plate) by controlling the pendulum bob 322; in the rock coupling performance test, the gas storage component 312 (or referred to as a gas storage bin) on the side can be used for transferring energy to the crushed stones in the rock storage component 311 (or referred to as a rock storage bin) to impact the protective net, and it can be understood that the coupling refers to the combined action of a tensile test and a normal dynamic and static load compression test.
The comprehensive evaluation of the mechanical properties of the protective net can be based on a plane one-way dynamic and static load tensile test, a plane two-way dynamic and static load tensile test, a normal dynamic and static load compression test and a rock coupling test, the type of the protective net, the diameter of net wires of the protective net, the size of net holes of the protective net and the structure (such as a connection mode) of the protective net are comprehensively tested, the strength and the rigidity of the protective net of different types are correspondingly evaluated, the field application and the monitoring are carried out, and a better protective net is obtained according to the monitoring result.
According to the technical scheme provided by the invention, the mechanical property test system and method for the underground engineering protective net can achieve the purpose of testing the mechanical property when dynamic and static loads are combined under different conditions of the protective net and comprehensively evaluating the overall mechanical property of the protective net.
According to the system and the method for testing the mechanical properties of the underground engineering protection net, the comprehensive mechanical properties of the protection net can be effectively tested, the comprehensive mechanical properties mainly comprise basic mechanical properties and coupling properties under the action of rocks, the mechanical properties of the protection net are comprehensively evaluated, and finally field application and field engineering guidance are carried out.
In embodiments of the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and for example, the terms "connected" and "connected" may be fixed or detachable or integrally connected. Specific meanings of the above terms in the embodiments of the present invention may be understood by those of ordinary skill in the art according to specific situations.
In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or units must have a specific direction, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the embodiments of the present invention.
In the description herein, the appearances of the phrase "one embodiment," "a preferred embodiment," or the like, are intended to mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer 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.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present embodiment by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.
Claims (8)
1. The utility model provides an underground engineering protection network mechanical properties test system which characterized in that includes:
the supporting device (1) comprises a supporting part (11) and a movable part (12), the movable part (12) is movably connected with the supporting part (11), the protective net is mounted on the movable part (12), and the movable part (12) is configured to drive the protective net to move between a tensile testing position and a rock testing position;
at least one tensile testing device (2), wherein in the state that the protective net is positioned at the tensile testing position, the at least one tensile testing device (2) is configured to perform tensile testing on the protective net;
a rock coupling test device (3), wherein the rock coupling test device (3) is configured to test the rock coupling of the protective net under the condition that the protective net is positioned at the rock test position;
the movable part (12) is rotatably connected with the supporting part (11), and the movable part (12) is configured to drive the protective net to rotate between the tensile testing position and the rock testing position;
the rock coupling effect testing device (3) comprises a crushed stone load testing part (31), the crushed stone load testing part (31) is located on the front side of the supporting part (11), and under the condition that the protective net is located at the rock testing position, the crushed stone load testing part (31) is configured to release crushed stones to the surface of the protective net.
2. The mechanical property test system for the underground engineering protection net according to claim 1 is characterized in that the supporting device (1) further comprises a rotating rod (13), the rotating rod (13) penetrates through the supporting part (11) from outside to inside through the outer peripheral wall of the supporting part (11), and the movable part (12) is rotatably connected in the supporting part (11) through the rotating rod (13);
underground works protection network mechanical properties test system still includes rotates drive arrangement, rotate drive arrangement's output with the outer end of dwang (13) meets, wherein the protection network is located under the state of tensile test position, the protection network is horizontal setting the protection network is located under the state of rock test position, the protection network is vertical setting.
3. An underground engineering protection net mechanical property test system according to claim 1, characterized in that the gravel load test part (31) comprises:
a stone storage member (311) having a stone storage cavity;
the gas storage piece (312) comprises a gas storage portion (3121) and a gas pump (3122), the gas storage portion (3121) has a gas storage inner cavity, and the gas storage inner cavity is communicated with the stone storage inner cavity; the air pump (3122) is communicated with the gas storage inner cavity and is configured to release the crushed stone in the stone storage inner cavity to the surface of the protective net.
4. An underground engineering protection net mechanical property test system according to claim 1, characterized in that the rock coupling test device (3) further comprises a complete rock load test part (32) located at the rear side of the support part (11), the complete rock load test part (32) comprises a pendulum bob support (321) and a pendulum bob (322), the pendulum bob support (321) is located at the front side of the support part (11), the pendulum bob (322) is rotatably arranged at the upper part of the support part (11) so that the pendulum bob (322) swings forwards from back to front relative to the pendulum bob support (321), and the pendulum bob (322) applies a load to the surface of the protection net in a state that the protection net is located at the rock test position.
5. The mechanical property test system for the underground engineering protection net according to claim 4, characterized by further comprising a double-acting hydraulic cylinder (4) arranged at the rear part of the supporting part (11), wherein the double-acting hydraulic cylinder (4) comprises a contact plate pushing piston rod (41) extending from front to back, a contact plate (5) is arranged at the front end of the contact plate pushing piston rod (41), and the swinging of the pendulum bob (322) pushes the contact plate to push the rear end of the piston rod (41) to move forwards so as to apply a load to the surface of the protection net through the contact plate (5) to realize a rock dynamic and static load test.
6. The mechanical property test system for the underground engineering protection net according to claim 1 is characterized in that the number of the tensile test devices (2) is four, the four tensile test devices (2) are uniformly arranged at the upper end of the movable part (12) at intervals along the circumferential direction of the supporting part (11) and are positioned at the periphery of the protection net, so that a planar unidirectional load test and a planar bidirectional load test of the protection net are realized;
tensile testing arrangement (2) include rectilinear motion structure (21) and protection network anchor clamps (22), rectilinear motion structure (21) set up in the upper end of movable part (12), protection network anchor clamps (22) are located the inboard of rectilinear motion structure (21), and with the output of rectilinear motion structure (21) meets, protection network anchor clamps (22) centre gripping in the protection network is so that the protection network install in movable part (12).
7. An underground engineering protection net mechanical property test system according to claim 6, characterized in that the linear motion structure (21) comprises a driving hydraulic cylinder (211) and a servo valve (212), the driving hydraulic cylinder (211) is arranged at the upper end of the movable part (12); the servo valve (212) is arranged on the driving hydraulic cylinder (211) and is configured to control the oil inlet amount of the driving hydraulic cylinder (211) so as to enable a stretching piston rod (2111) of the driving hydraulic cylinder (211) to carry out impact motion, and therefore a plane one-way dynamic and static load test and a plane two-way dynamic and static load test are achieved;
the mechanical property test system for the underground engineering protection net further comprises a displacement sensor (6) arranged on the stretching piston rod (2111) to detect the deformation amount of the protection net.
8. A mechanical property test method for underground engineering protection nets is characterized in that the mechanical property test method for underground engineering protection nets is based on the mechanical property test system for underground engineering protection nets of any one of claims 1 to 7, and comprises the following steps:
the edge of the protective net is clamped by a plurality of protective net clamps (22) so that the protective net is mounted on the movable component (12);
placing the protective net at a tensile test position, and stretching the protective net through a tensile test device (2) to perform tensile test on the protective net;
adjusting the position of the movable part (12) to enable the protective net to be located at a rock testing position;
carrying out rock coupling test on the protective net by using a rock coupling test device (3); the rock coupling test device (3) comprises a gravel load test part (31), the gravel load test part (31) is positioned on the front side of the supporting part (11), and the gravel load test part (31) is configured to release gravel to the surface of the protective net under the condition that the protective net is positioned at the rock test position;
so as to complete the tensile test and the rock coupling test of the protective net.
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