CN113865991B - Creep machine and method for coal rock asymmetric load test considering impact disturbance - Google Patents
Creep machine and method for coal rock asymmetric load test considering impact disturbance Download PDFInfo
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- CN113865991B CN113865991B CN202111141976.7A CN202111141976A CN113865991B CN 113865991 B CN113865991 B CN 113865991B CN 202111141976 A CN202111141976 A CN 202111141976A CN 113865991 B CN113865991 B CN 113865991B
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- 238000012360 testing method Methods 0.000 title claims abstract description 40
- 239000011435 rock Substances 0.000 title claims abstract description 38
- 239000003245 coal Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 238000005065 mining Methods 0.000 claims abstract description 7
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 6
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 34
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims 2
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
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Abstract
The invention belongs to the technical field of rock mechanics tests, and particularly relates to a creep machine and a creep deformation method for a coal rock asymmetric load test considering impact disturbance. The invention comprises a supporting base, an asymmetric load applying device, an impact disturbance applying device and a confining pressure loading device, wherein the asymmetric load applying device, the impact disturbance applying device and the confining pressure loading device are used for truly reproducing the rheological instability process of coal and rock during the coupling of asymmetric load, lateral pressure and impact disturbance in the deep mining process; the lever load device of the asymmetric load applying device presses downwards and applies an asymmetric load to the sample through the rigid gasket and the rubber gasket; four application components of the confining pressure loading device realize bidirectional isobaric loading, isobaric loading and unilateral loading; the application device of the impact disturbance application device moves up and down to drive the impact steel hammer to apply impact disturbance to the sample from the bottom of the sample. The invention can truly reproduce the rheological instability process of the coal and rock during asymmetric load, lateral pressure and impact disturbance coupling in the deep mining process.
Description
Technical Field
The invention belongs to the technical field of rock mechanics tests, and particularly relates to a creep machine and a creep deformation method for a coal rock asymmetric load test considering impact disturbance.
Background
Coal and rock mass in the deep underground mining process is subjected to high ground stress for a long time, and obvious creep characteristics are shown. Meanwhile, dynamic disturbance generated by mechanical rock drilling and explosive blasting can also act on the rock. Therefore, the rock in the deep underground mine is under the combined action of high ground stress and dynamic disturbance, and the interaction between the high ground stress and the dynamic disturbance plays an important role in deformation and damage evolution of the rock mass. In addition, due to the influence of excavation or coal pillar setting, coal and rock mass is often subjected to the action of asymmetric load, and the existence of the asymmetric load can accelerate the duration of three stages of coal and rock creep, so that stable rock mass can be maintained to be damaged in advance when uniform load acts. Therefore, under the action of dynamic disturbance, coal and rock creep test research is necessary when asymmetric load and confining pressure are combined.
The existing creep endurance testing machine is mainly used for stretching, compression endurance, creep and relaxation tests of metal and nonmetal materials and low-cycle fatigue and creep fatigue tests, and is divided into mechanical type and electronic type according to structures and principles. Because the temperature drift and calibration value drift of the force measuring system of the electronic testing machine cannot be thoroughly eliminated, long-time creep test cannot be carried out, and the existing mechanical creep testing machine adopts a lever type structure, but does not have a creep testing machine which can be used for simultaneously carrying out research on influence of impact disturbance magnitude/frequency, different side pressure ratios and load asymmetry on coal and rock creep.
Disclosure of Invention
The invention aims to solve the problems and provides a creep machine and a creep deformation method for a coal and rock asymmetric load test considering impact disturbance.
The invention is realized by adopting the following technical scheme: a creep machine and a method for a coal rock asymmetric load test considering impact disturbance comprise a supporting base, an asymmetric load applying device, an impact disturbance applying device and a confining pressure loading device, wherein the asymmetric load applying device, the lateral pressure and the asymmetric load applying device, the impact disturbance applying device and the confining pressure loading device are used for truly reproducing the rheological instability process of coal rock in the deep mining process;
the asymmetric load applying device comprises a lever load device, a rigid gasket and a rubber gasket, wherein the lever load device is connected above the supporting base, the rigid gasket and the rubber gasket are paved on the upper surface of the sample side by side and are detachably connected to the bottom of the lever load device, and the lever load device presses downwards and applies asymmetric load to the sample through the rigid gasket and the rubber gasket; the confining pressure loading device comprises four application components which are arranged in a symmetrical mode, wherein the four application components realize bidirectional isobaric loading, isobaric loading and unilateral loading; the impact disturbance applying device is connected to the top of the supporting base and comprises an applying device and an impact steel hammer, and the applying device moves up and down to drive the impact steel hammer to apply impact disturbance to the sample from the bottom of the sample.
Further, the lever load device of the asymmetric load applying device comprises a supporting upright post, a hinge, a pressure transmission cross beam and a weight tray;
The support base is fixed on the ground through a base bolt, the support upright post is in threaded connection with the top of one side of the support base, one end of the pressure transmission cross beam is rotationally connected with the top end of the support upright post through a hinge, the rigid gasket and the rubber gasket are connected with the lower part of the pressure transmission cross beam, which is close to the position of the support upright post, and the lower part of the other end of the pressure transmission cross beam is detachably connected with a weight disc.
Further, the rigid gasket and the rubber gasket are connected with a pressure transmission rod;
The position of connecting the rigid gasket and the rubber gasket on the pressure transmission beam is provided with a chute, and the pressure transmission rod penetrates through the chute and is connected and fastened through a fixing nut.
Further, the impact disturbance applying device comprises a support bolt, a fixed support, a spring base, a spring, a sleeve and a spring poking piece;
The fixed support is detachably connected to the top of the supporting base through a support bolt, the sleeve is connected to the top of the fixed support, the bottom end inside the sleeve is detachably connected with the spring base, the top of the spring base is detachably connected with the spring, and the top of the spring is detachably connected with the impact steel hammer;
one side of the sleeve is provided with a slit from bottom to top, one side of the top end of the spring is provided with a spring poking plate, the spring poking plate and the slit form a moving pair, and two sides of the slit are provided with graduated scales from bottom to top.
Further, the bottom of sleeve pipe is equipped with the external screw thread, and fixed bolster's top is equipped with the internal thread hole, internal thread hole and external screw thread connection.
Further, the lower surface of the spring base is carved with a cross groove.
Further, the confining pressure loading device further comprises four jack slideways which are arranged in a cross shape, and the four jack slideways are fixed at the top of the sleeve;
the bottoms of the four application parts are respectively provided with a jack support, and the jack supports and the jack slide way form a moving pair and are fixed on the jack slide way through buckles.
Further, the application member is a jack.
Further, the end of the jack is detachably connected with a pressure-bearing gasket through a bolt.
A testing method of a creep machine for a coal rock asymmetric load test considering impact disturbance comprises the following steps:
step one, adjusting the relative positions of the sleeve and the fixed support, so as to meet the height requirement of a sample; 4 jack positions are regulated, so that the width requirement of a sample is met;
Selecting a rigid gasket, a rubber gasket and a pressure-bearing gasket with proper sizes according to the sizes of the samples and the requirements of the asymmetric degree of the applied load, and adjusting the position of the pressure transmission rod until the pressure transmission cross beam is parallel to the ground when no weight is placed;
Thirdly, applying lateral pressure to the sample through jacks around the sample according to the side pressure value requirement, and maintaining the pressure value constant; according to the constant stress requirement of the test, weights with corresponding weights are loaded on the weight tray step by step, and the lever principle is utilized to transmit torque to press the sample until the constant stress requirement is reached; in the creep process, the spring is pressed down/released through the spring shifting plate, and impact disturbance on the sample is realized by utilizing the impact of the impact steel hammer on the top of the sleeve.
Compared with the prior art, the invention has the beneficial effects that:
1. The application can truly simulate the stress environment of the coal rock in the actual engineering, can develop the coal rock creep process under the asymmetric load effect of different degrees under the condition of different ratio of the two-way side pressure, and can reflect the influence of impact disturbance of different quantity values on the creep stage of the coal rock;
2. The application realizes the quantitative impact disturbance action on the sample by controlling the compression amount of the spring, and can truly reproduce the rheological instability process of the coal rock during asymmetric load, lateral pressure and impact disturbance coupling in the deep mining process;
3. The lever load device disclosed by the application is pressed downwards, and asymmetric load is applied to the sample through the rigid gasket and the rubber gasket, so that different-degree asymmetric load creep tests can be carried out, and the defect that the existing creep test machine can only carry out uniform load creep tests is overcome;
4. The 4 jacks can realize bidirectional isobaric loading, unequal pressure loading or unilateral loading, and overcomes the defect that the traditional lever type creep testing machine can only consider uniaxial compression or bidirectional isobaric loading;
4. The application has simple manufacturing process and convenient operation, and can carry out long-time graded loading test on the coal rock sample;
5. The application is suitable for testing samples with different sizes by adjusting the distance between the sleeve and the pressure transmission cross beam and the distance between the jack and the sample, and has wide application range.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a top view of the pressure transfer beam;
FIG. 3 is a top view of the confining pressure loading device;
FIG. 4 is a top view of an impact disturbance applying device;
wherein: 1-supporting base, 2-base bolt, 3-supporting base bolt, 4-fixed support, 5-supporting column, 6-hinge, 7-pressure transmission beam, 8-spring base, 9-spring, 10-sleeve, 11-impact steel hammer, 12-spring plectrum, 13-jack slideway, 14-applying part, 15-jack support, 16-pressure bearing gasket, 17-rubber gasket, 18-rigid gasket, 19-fixation nut, 20-pressure transmission rod, 21-weight disc, 22-sample, 23-chute.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which is to be read in light of the specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
Referring to fig. 1 to 4, the present invention provides a technical solution: a creep machine and method for coal rock asymmetric load test considering impact disturbance comprises a supporting base 1, an asymmetric load applying device, an impact disturbance applying device and a confining pressure loading device, wherein the asymmetric load applying device, the lateral pressure and the asymmetric load applying device, the impact disturbance applying device and the confining pressure loading device are used for truly reproducing the rheological instability process of coal rock in the deep mining process;
The asymmetric load applying device comprises a lever load device, a rigid gasket 18 and a rubber gasket 17, wherein the lever load device is connected above the supporting base 1, the rigid gasket 18 and the rubber gasket 17 are paved on the upper surface of the sample 22 side by side and are detachably connected to the bottom of the lever load device, and the lever load device presses downwards and applies an asymmetric load to the sample 22 through the rigid gasket 18 and the rubber gasket 17; the confining pressure loading device comprises four application parts 14, namely front, back, left and right, wherein the four application parts 14 are symmetrically arranged in pairs, and the four application parts 14 realize bidirectional isobaric loading, isobaric loading and unilateral loading; the impact disturbance applying device is connected to the top of the supporting base 1, and comprises an applying device and an impact steel hammer 11, and the applying device moves up and down to drive the impact steel hammer 11 to apply impact disturbance to the sample 22 from the bottom of the sample 22.
The lever load device of the asymmetric load applying device comprises a supporting upright post 5, a hinge 6, a pressure transmission cross beam 7 and a weight tray 21;
The support base 1 is fixed on the ground through the base bolt 2, the support column 5 is in threaded connection at the top of support base 1 one side, the one end of the pressure transmission crossbeam 7 is connected on the top of the support column 5 through the rotation of hinge 6 (the pressure transmission crossbeam 7 can rotate around hinge 6), the rigid gasket 18 and the rubber gasket 17 are connected on the pressure transmission crossbeam 7 below near the position of the support column 5, the weight tray 21 is detachably connected below the other end of the pressure transmission crossbeam 7 (the weight tray 21 is in threaded connection with the pressure transmission crossbeam 7, and creep tests on different stress levels of a sample 22 can be realized by gradually increasing weights on the weight tray 21).
The rigid gasket 18 and the rubber gasket 17 are both connected with a pressure transmission rod 20 (screw holes are respectively arranged at the center positions of the rigid gasket 18 and the rubber gasket 17, the hole depth of the screw holes is half of the thickness of the body, the bottom ends of the two pressure transmission rods 20 are provided with external threads, the two pressure transmission rods 20 are respectively connected with the rigid gasket 18 and the rubber gasket 17 in a threaded manner, and the rigid gasket 18 and the rubber gasket 17 have various dimensions, so that the pressure transmission rod is suitable for samples 22 with different lengths and widths);
the pressure transmission beam 7 is provided with a chute 23 at the position connecting the rigid gasket 18 and the rubber gasket 17, and the pressure transmission rod 20 passes through the chute 23 and is connected and fastened by a fixing nut 19.
The impact disturbance applying device comprises a support bolt 3, a fixed support 4, a spring base 8, a spring 9, a sleeve 10 and a spring poking piece 12;
The fixed support 4 is detachably connected to the top of the support base 1 through the support bolt 3, the sleeve 10 is connected to the top of the fixed support 4, the bottom end inside the sleeve 10 is detachably connected with the spring base 8, the top of the spring base 8 is detachably connected with the spring 9, the outer wall of the spring base 8 is provided with external threads, the inner wall of the sleeve 10 is provided with internal threads, and the spring base 8 is in threaded connection with the sleeve 10; an internal threaded hole is formed in the center of the upper surface of the spring base 8, external threads are formed in the bottom end of the spring 9, and the spring base 8 is in threaded connection with the spring 9; the spring 9 is convenient to replace; the top of the spring 9 is detachably connected with an impact steel hammer 11, a threaded hole is formed in the center of the bottom of the impact steel hammer 11, external threads are formed in the top end of the spring 9, and the impact steel hammer 11 is in threaded connection with the spring 9;
One side of the sleeve 10 is provided with a slit from bottom to top, one side of the top end of the spring 9 is provided with a spring poking plate 12, the spring poking plate 12 and the slit form a moving pair, the two sides of the slit are provided with graduated scales from bottom to top, the spring poking plate 12 can move up and down along the slit, compression of the spring 9 and free extension of the spring 9 are performed, so that the movement of the impact steel hammer 11 is controlled, and the compression amount of the spring 9 can be read through the graduated scales, so that quantification of impact disturbance is realized.
The bottom of sleeve pipe 10 is equipped with the external screw thread, and the top of fixed bolster 4 is equipped with the internal thread hole, and internal thread hole and external screw thread connection adjust sleeve pipe 10 and the distance of passing pressure crossbeam 7 through the degree of depth of adjusting sleeve pipe 10 screw in internal thread hole to adapt to the sample 22 of different high sizes.
The lower surface of the spring base 8 is carved with a cross groove, so that the spring base 8 can be screwed in and out conveniently.
The confining pressure loading device further comprises four jack slide ways 13 which are arranged in a cross shape, and the four jack slide ways 13 are fixed on the top of the sleeve 10;
The bottoms of the four application parts 14 are respectively provided with a jack support 15, and the jack supports 15 and the jack slide ways 13 form a moving pair and are fixed on the jack slide ways 13 through buckles; thereby accommodating samples 22 of different lengths and widths.
The application member 14 is a jack.
The end of the jack is detachably connected with a pressure-bearing gasket 16 through a bolt, the end of the jack is carved with threads, a threaded hole is formed in the center of the pressure-bearing gasket 16, the depth of the threaded hole is half of the thickness of the pressure-bearing gasket 16, and the pressure-bearing gasket 16 and the jack are in threaded connection, so that the pressure-bearing gasket 16 can be replaced conveniently.
A testing method of a creep machine for a coal rock asymmetric load test considering impact disturbance comprises the following steps:
Step one, adjusting the relative positions of the sleeve 10 and the fixed support 4 to meet the height requirement of the sample 22; 4 jack positions are regulated, so that the width requirement of a sample is met;
Selecting a rigid gasket 18, a rubber gasket 17 and a pressure-bearing gasket 16 with proper sizes according to the sizes of the samples 22 and the demands of the asymmetric degree of applied load, connecting the pressure-bearing gasket 16 with a jack 14, respectively connecting the rubber gasket 17 and the rigid gasket 18 with a pressure-transmitting rod 20, adjusting the position of the pressure-transmitting rod 20 in a chute 23, placing the samples 22 above a sleeve 10, adjusting the depth of the sleeve 10 screwed into a fixed support 4 until a pressure-transmitting cross beam 7 is parallel to the ground when no weight is placed;
Step three, adjusting 4 jacks 14 to a reasonable position, fixing a jack support 15 on a jack slideway 13, starting the jacks according to the side pressure value requirement and the side pressure coefficient designed by the test scheme, applying lateral pressure to a sample 22 to a target value through the jacks around the sample 22, and maintaining the pressure value constant; according to the constant stress requirement of the test, weights with corresponding weights are loaded on the weight tray 21 step by step, after the axial strain of the sample is stable, the weights with corresponding weights are loaded on the weight tray again, and the application of the load of the next stage is started until the sample is destroyed; in the creep process, the spring is pressed down/released through the spring poking plate 12, the impact steel hammer 11 is used for impacting the top of the sleeve to realize impact disturbance on the sample 22, and the graduated scale on one side of the slit of the sleeve 10 is used for realizing quantitative application of the impact disturbance; in the test process, the deformation condition of the sample in the creep test process can be recorded by externally connecting a micrometer between the pressure transmission cross beam 7 and the pressure bearing gasket 18, and a strain time curve in the creep process is drawn.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (7)
1. The utility model provides a consider creep machine of coal rock asymmetric load test of impact disturbance which characterized in that: the device comprises a supporting base (1), and an asymmetric load applying device, an impact disturbance applying device and a confining pressure loading device which are used for truly reproducing the asymmetric load, lateral pressure and rheological instability process of coal and rock during impact disturbance coupling in the deep mining process;
The asymmetric load applying device comprises a lever load device, a rigid gasket (18) and a rubber gasket (17), wherein the lever load device is connected above the supporting base (1), the rigid gasket (18) and the rubber gasket (17) are paved on the upper surface of the sample (22) side by side and are detachably connected to the bottom of the lever load device, and the lever load device presses downwards and applies asymmetric load to the sample (22) through the rigid gasket (18) and the rubber gasket (17); the confining pressure loading device comprises four application components (14) which are arranged in a front-back and left-right mode, the four application components (14) are symmetrically arranged in pairs, and the four application components (14) realize bidirectional isobaric loading, unequal isobaric loading and unilateral loading; the impact disturbance applying device is connected to the top of the supporting base (1), and comprises an applying device and an impact steel hammer (11), and the applying device moves up and down to drive the impact steel hammer (11) to apply impact disturbance to the sample (22) from the bottom of the sample (22);
the lever load device of the asymmetric load applying device comprises a supporting upright post (5), a hinge (6), a pressure transmission cross beam (7) and a weight tray (21);
The support base (1) is fixed on the ground through a base bolt (2), the support upright (5) is in threaded connection with the top of one side of the support base (1), one end of the pressure transmission cross beam (7) is rotationally connected with the top end of the support upright (5) through a hinge (6), the rigid gasket (18) and the rubber gasket (17) are connected to the lower part of the pressure transmission cross beam (7) close to the position of the support upright (5), and the lower part of the other end of the pressure transmission cross beam (7) is detachably connected with a weight disc (21);
The rigid gasket (18) and the rubber gasket (17) are connected with a pressure transmission rod (20);
The position of the pressure transmission cross beam (7) connected with the rigid gasket (18) and the rubber gasket (17) is provided with a chute (23), and the pressure transmission rod (20) passes through the chute (23) and is connected and fastened through a fixing nut (19);
The impact disturbance applying device comprises a support bolt (3), a fixed support (4), a spring base (8), a spring (9), a sleeve (10) and a spring poking piece (12);
The fixed support (4) is detachably connected to the top of the supporting base (1) through a support bolt (3), the sleeve (10) is connected to the top of the fixed support (4), the bottom end inside the sleeve (10) is detachably connected with the spring base (8), the top of the spring base (8) is detachably connected with the spring (9), and the top of the spring (9) is detachably connected with the impact steel hammer (11);
one side of the sleeve (10) is provided with a slit from bottom to top, one side of the top end of the spring (9) is provided with a spring poking piece (12), the spring poking piece (12) and the slit form a moving pair, and two sides of the slit are provided with graduated scales from bottom to top.
2. A creep machine for coal rock asymmetric loading test taking into account impact disturbance according to claim 1, wherein: the bottom of sleeve pipe (10) is equipped with the external screw thread, and the top of fixed bolster (4) is equipped with the internal thread hole, and internal thread hole and external screw thread connection.
3. A creep machine for coal rock asymmetric loading test taking into account impact disturbance according to claim 2, wherein: the lower surface of the spring base (8) is carved with a cross groove.
4. A creep machine for coal rock asymmetric loading test taking into account impact disturbance according to claim 3, wherein: the confining pressure loading device further comprises four jack slide ways (13) which are arranged in a cross shape, and the four jack slide ways (13) are fixed at the top of the sleeve (10);
The bottoms of the four application parts (14) are respectively provided with a jack support (15), and the jack supports (15) and the jack slide ways (13) form a moving pair and are fixed on the jack slide ways (13) through buckles.
5. The creep machine for coal rock asymmetric loading test taking into account impact disturbance according to claim 4, wherein: the application member (14) is a jack.
6. The creep machine for coal rock asymmetric loading test taking into account impact disturbance according to claim 5, wherein: the end of the jack is detachably connected with a pressure-bearing gasket (16) through a bolt.
7. The test method of the creep machine for the coal rock asymmetric load test considering impact disturbance according to claim 5, wherein the test method comprises the following steps: the method comprises the following steps:
step one, adjusting the relative positions of the sleeve (10) and the fixed support (4) to meet the height requirement of a sample (22); 4 jack positions are regulated, so that the width requirement of a sample is met;
Selecting a rigid gasket (18), a rubber gasket (17) and a pressure-bearing gasket (16) with proper sizes according to the requirements of the size of a sample (22) and the asymmetry degree of an applied load, and adjusting the position of a pressure transmission rod (20) until a pressure transmission cross beam is parallel to the ground when no weight is placed;
thirdly, applying lateral pressure to the sample (22) through jacks around the sample (22) according to the side pressure value requirement, and maintaining the pressure value constant; according to the constant stress requirement of the test, weights with corresponding weights are loaded on the weight tray (21) step by step, and the lever principle is utilized to transmit torque to press the sample (22) until the constant stress requirement is reached; in the creep process, the spring is pressed down/released through the spring poking plate (12), and impact disturbance on the sample (22) is realized by impact of the impact steel hammer (11) on the top of the sleeve.
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| CN111735718A (en) * | 2020-07-20 | 2020-10-02 | 西安交通大学 | Multi-station integrated environment glass fiber reinforced plastic bending creep test device and test method |
| CN111896399A (en) * | 2020-08-05 | 2020-11-06 | 辽宁工业大学 | Creep-impact coupling test system and method for research CFRP (carbon fiber reinforced plastics) constrained heat damage coal sample |
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| KR20030071130A (en) * | 2002-02-27 | 2003-09-03 | 주식회사 파워엠엔씨 | Creep tester |
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| CN111735718A (en) * | 2020-07-20 | 2020-10-02 | 西安交通大学 | Multi-station integrated environment glass fiber reinforced plastic bending creep test device and test method |
| CN111896399A (en) * | 2020-08-05 | 2020-11-06 | 辽宁工业大学 | Creep-impact coupling test system and method for research CFRP (carbon fiber reinforced plastics) constrained heat damage coal sample |
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