CN115326570A - Device and method for testing anchoring mechanical property of composite rock anchor rod in tension-shear state - Google Patents
Device and method for testing anchoring mechanical property of composite rock anchor rod in tension-shear state Download PDFInfo
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- CN115326570A CN115326570A CN202211060586.1A CN202211060586A CN115326570A CN 115326570 A CN115326570 A CN 115326570A CN 202211060586 A CN202211060586 A CN 202211060586A CN 115326570 A CN115326570 A CN 115326570A
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- 238000012360 testing method Methods 0.000 title claims abstract description 122
- 239000011435 rock Substances 0.000 title claims abstract description 49
- 239000002131 composite material Substances 0.000 title claims abstract description 42
- 238000004873 anchoring Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000006073 displacement reaction Methods 0.000 claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- 206010057175 Mass conditions Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a device and a method for testing anchoring mechanical property of a composite rock anchor rod in a tension-shear state, and the device comprises a U-shaped frame, wherein a jacking electric jack is fixedly connected to the U-shaped frame, a U-shaped guide groove is fixedly connected to the top end of the jacking electric jack, a rolling shaft is rotatably connected in each U-shaped guide groove, a T-shaped test piece mold is arranged on the U-shaped frame, a plurality of threaded steel bars are arranged in each T-shaped test piece mold, L-shaped pressing blocks are arranged on two sides of each T-shaped test piece mold, a side-pushing electric jack is fixedly connected to the U-shaped frame, a push plate is fixedly connected to the end part of each side-pushing electric jack, and displacement sensors are arranged on each U-shaped guide groove and each push plate. The test device can simulate the anchoring mechanical property of the composite rock anchor rod in a tension-shear state, further explore the tension-shear strength of the anchor rod, and provide theoretical reference for selection of a supporting scheme and supporting parameters.
Description
Technical Field
The invention belongs to the technical field of underground space or tunnel anchor rods, and particularly relates to a device and a method for testing anchoring mechanical property of a composite rock anchor rod in a tension-shear state.
Background
The composite rock mass is a sedimentary coal rock mass which is often encountered in the engineering fields of rock slope, underground engineering, traffic tunnels and the like, is mostly distributed in a layered manner and is influenced by factors such as sedimentary environment and the like, and each rock stratum has larger mechanical property difference and obvious bedding surface. Engineering practice shows that: the deformation characteristics of separation and sliding of the bedding surface of the composite rock mass are easily caused under the influence of factors such as engineering excavation or mining disturbance, the anchor rod in the anchoring composite rock mass is actually in a tension, shearing and tension-shear coupling stress state, the on-site anchor rod also shows obvious tension-shear damage, the stability of a supporting structure is seriously influenced, and further engineering geological disasters are caused.
At present, the related support design specifications in China mostly only consider the axial action of the anchor rod. At home and abroad, relevant research results mostly concentrate on the stress characteristics of the axial direction and the anchoring interface of the anchor rod, and the influence of factors such as joint surface roughness and normal stress on the shear strength is intensively researched aiming at the shear resistance of the anchored jointed rock mass which is also mostly concentrated on the transverse deformation of the anchor rod. However, the composite rock mass of the underground engineering is influenced by excavation of a chamber or a roadway and the like, and all rock stratums of the top plate show uneven settlement and horizontal dislocation macroscopically due to lithologic differences, so that the anchor rod is under the combined action of axial tensile force caused by interlayer separation and transverse shear force caused by interlayer slippage dislocation at the bedding surface, belongs to a tension-shear coupling stress state, and easily causes tensile damage, shear damage or tension-shear damage of the anchor rod. But the anchoring mechanical property and the failure mode of the anchor rod in the anchoring composite rock mass under the tension-shear stress state are not clear at present. Therefore, the research on the anchoring mechanical characteristics of the composite rock anchor rod in a tension-shear state has important theoretical significance and application value for guiding the design of the support parameters of the composite rock anchor rod, preventing engineering disasters and the like.
The existing test device for testing the shearing resistance of the jointed rock bolt is mainly focused on the anchoring aspect of an overground slope in a jointed rock pressing and shearing state, the tension and shearing stress state of the bolt in the composite rock bolt added and anchored in underground space engineering is difficult to effectively realize in an actual test, so that the test device capable of effectively testing the anchoring performance of the composite rock bolt in a tension and shearing state is not reported yet, and the research on the anchoring mechanical property of the composite rock bolt in the tension and shearing state is seriously hindered.
Disclosure of Invention
The invention aims to provide a device and a method for testing anchoring mechanical property of a composite rock anchor rod in a tension-shear state, and solves the problem that no device for effectively testing the stress deformation characteristic and the anchoring property of the composite rock anchor rod in the tension-shear state exists in the prior art.
The invention adopts the technical scheme that the device for testing the anchoring mechanical property of the composite rock anchor rod in the tension-shear state comprises a U-shaped frame, two vertically and symmetrically arranged jacking electric jacks are fixedly connected to the inner side of a bottom plate of the U-shaped frame, a U-shaped guide groove is fixedly connected to the top end of each jacking electric jack, a plurality of rolling shafts which are arranged side by side are rotatably connected in each U-shaped guide groove, a T-shaped test piece mold is arranged on the inner side of the bottom plate of the U-shaped frame between the two jacking electric jacks, a plurality of threaded steel bars are arranged in each T-shaped test piece mold, L-shaped press blocks are arranged on two sides of each T-shaped test piece mold, the T-shaped test piece molds are clamped in a space defined by the two L-shaped press blocks and the U-shaped frame, a horizontally arranged side-pushing electric jack is fixedly connected to the inner side of one side plate of the U-shaped frame, a vertically arranged push plate is fixedly connected to the end of each side-pushing electric jack, and displacement sensors are arranged on each U-shaped guide groove and each push plate.
And horizontally arranged reinforcing steel plates are detachably connected to two sides of the U-shaped frame.
Bearing seats are arranged between the U-shaped guide grooves and two ends of each rolling shaft, and the rolling shafts are rotatably connected with the U-shaped guide grooves through the bearing seats.
The test method of the anchoring mechanical property of the composite rock anchor rod in a tension-shear state comprises the following steps:
the first step is as follows: preparing a concrete test piece; clamping a T-shaped test piece mould in an L-shaped pressing block, then preparing an upper concrete test piece and a lower concrete test piece according to designed concrete for simulating composite rock masses with different strengths, wherein the upper concrete test piece is prefabricated and poured in a mould with the length of 60cm, the width of 15cm and the height of 20cm, and after the upper concrete test piece is cured to meet the strength requirement, removing the mould and taking out the upper mould for later use; pouring the proportioned concrete into a T-shaped test piece mold according to the design, wherein the internal dimension of the T-shaped test piece mold is 10cm in length, 15cm in width and 15cm in height, two threaded steel bars with the horizontal interval of 4cm are welded inside the T-shaped test piece mold to restrict the movement of the concrete inside the T-shaped test piece mold, the diameter of each threaded steel bar is 14mm, the upper concrete test piece and the lower concrete test piece both need to adopt PVC pipes to reserve anchor rod holes with the same diameter in the center of the upper concrete test piece and the lower concrete test piece in the pouring process, and the diameter of the reserved anchor rod holes needs to be adjusted according to the test requirements;
the second step is that: clamping the T-shaped test piece die and the cured lower concrete test piece in an L-shaped pressing block, placing the prefabricated cured upper concrete test piece on a rolling shaft of a U-shaped guide groove, wherein an anchor rod hole of the upper concrete test piece is aligned with an anchor rod hole of the lower concrete test piece up and down, and then inserting an anchor rod into the anchor rod hole and pouring an anchoring agent for curing until the anchoring strength of the anchor rod meets the test requirement;
the third step: the reinforcing steel plates are connected with the U-shaped frame through fastening bolts and are arranged on the front side and the rear side of the upper concrete test piece, so that front and rear deviation of the push plate on the roller in the test process of pushing the upper concrete test piece is avoided;
the fourth step: installing a displacement sensor, and electrically connecting the displacement sensor, the jacking electric jack and the side-pushing electric jack with a control computer respectively;
the fifth step: after all the preparation work is finished, controlling the loading modes and the loading rates of the jacking electric jack and the side-pushing electric jack through a computer according to simulation parameters pre-designed in the test, respectively monitoring and recording the elongation of the jacking electric jack and the side-pushing electric jack in real time through the computer and a displacement sensor, and monitoring and recording the vertical displacement and the horizontal displacement of the upper concrete test piece;
and a sixth step: simulating composite rock masses with different strengths according to the concrete with different label strengths according to the operations from the first step to the fifth step, and monitoring and recording the vertical displacement and the horizontal displacement of the upper concrete test specimen;
the seventh step: the anchoring mechanical characteristics of the composite rock anchor rod in the tension-shear state are obtained according to the analysis of the results, the tension-shear strength of the anchor rod under different composite rock conditions, namely the failure mode of anchor rod anchoring, is further proved, and theoretical reference is provided for the supporting scheme and supporting parameters of underground engineering or tunnel engineering, so that engineering technicians can select the optimal supporting scheme and supporting parameters.
The invention has the beneficial effects that: the test device fills the blank of the test device for testing the anchoring performance of the composite rock bolt in the tension-shear state in the prior art, can be used for simulating the anchoring mechanical property of the composite rock bolt in the tension-shear state, further finds out the tension-shear strength of the bolt under different composite rock mass conditions, namely the failure mode of bolt anchoring, provides theoretical reference for the supporting scheme and supporting parameters of underground engineering or tunnel engineering, and provides engineering technicians with optimal supporting scheme and supporting parameters.
Drawings
FIG. 1 is a schematic structural diagram of a stressed condition of a bolt in a compression-shear state in the prior art;
FIG. 2 is a schematic structural diagram of a prior art anchor rod under a stress condition in a tension-shear state;
FIG. 3 is a schematic view of the testing apparatus of the present invention;
FIG. 4 is a schematic top view of the testing device of the present invention;
FIG. 5 is a schematic structural view of a U-shaped guide groove of the present invention;
FIG. 6 is a schematic structural diagram of a T-shaped test piece mold of the present invention.
Reference numerals: 1. a rocky slope; 2. an anchor rod; 3. the bedding surface of the composite rock stratum generates separation and slippage; 4. a composite rock mass; 5. a roadway; 6. a U-shaped frame; 7. jacking an electric jack; 9. a U-shaped guide groove; 10. a roller; 11. a T-shaped test piece mold; 12. twisted steel bars; 13. an L-shaped briquette; 14. laterally pushing the electric jack; 15. pushing a plate; 16. a displacement sensor; 17. reinforcing the steel plate; 18. a bearing seat; 19. a concrete test specimen at the upper part; 20. the concrete test piece of lower part.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
As shown in figures 1 to 6, the invention provides a device and a method for testing anchoring mechanical property of a composite rock anchor rod in a tension-shear state, wherein the device comprises a U-shaped frame 6,U type frame 6 which is welded by a Q235 steel plate with the thickness of 2cm, and the U-shaped frame 6 after welding is 37cm in overall height, 100cm in length and 23cm in width. The two sides of the U-shaped frame 6 are detachably connected with horizontally arranged reinforcing steel plates 17, and the reinforcing steel plates 17 are 100cm long, 2cm wide and 10cm high so as to increase the rigidity of the U-shaped frame 6. The lifting electric jacks 7 are fixedly connected to the inner side of the bottom plate of the U-shaped frame 6, two vertical and symmetrical lifting electric jacks 7 are vertically and symmetrically arranged, a plurality of rolling shafts 10 arranged side by side are rotatably connected in the U-shaped guide grooves 9,U and the U-shaped guide grooves 9 fixedly connected to the top ends of the lifting electric jacks 7, the distance between the rolling shafts 10 is 5mm, the rolling shafts 10 are solid shafts made of 40cr, and the rolling shafts 10 are 14.9cm in length and 10mm in diameter. Bearing seats 18 are arranged between the U-shaped guide groove 9 and two ends of each rolling shaft 10, and the rolling shafts 10 are rotatably connected with the U-shaped guide groove 9 through the bearing seats 18. The situation between the roller 10 and the bearing seat 18 is observed at any time during the use process, and the grease is added in real time to reduce the friction between parts. The inner side of a bottom plate of a U-shaped frame 6 between two jacking electric jacks 7 is provided with a T-shaped test piece die 11, a plurality of threaded steel bars 12 are arranged in the T-shaped test piece die 11, two sides of the T-shaped test piece die 11 are provided with L-shaped pressing blocks 13, the T-shaped test piece die 11 is clamped in a space defined by the two L-shaped pressing blocks 13 and the U-shaped frame 6, the inner side of a side plate on one side of the U-shaped frame 6 is fixedly connected with a side-pushing electric jack 14 which is horizontally arranged, the end part of the side-pushing electric jack 14 is fixedly connected with a vertically arranged push plate 15, displacement sensors 16 are arranged on the U-shaped guide groove 9 and the push plate 15, the size specification of the push plate 15 is 15cm high, 15cm wide and 2cm thick, the height from the bottom surface of the push plate 15 to the top surface of the bottom plate of the U-shaped frame 6 is 20cm, the contact area between the push plate 15 and the upper concrete test piece 19 is ensured to be large enough as far as possible, so as to prevent the upper concrete test piece 19 from being damaged due to local concentrated load, and the up and down movement of the U-shaped guide groove 9 cannot be influenced by the position of the push plate 15.
The test method of the anchoring mechanical property of the composite rock anchor rod in a tension-shear state comprises the following steps:
the first step is as follows: preparing a concrete test piece; clamping a T-shaped test piece mold 11 in an L-shaped pressing block 13, then preparing an upper concrete test piece 19 and a lower concrete test piece 20 according to designed concrete for simulating composite rock masses with different strengths, wherein the upper concrete test piece 19 needs to be prefabricated and poured in a mold with the length of 60cm, the width of 15cm and the height of 20cm, and after the upper concrete test piece 19 is cured to meet the strength requirement, removing the mold and taking out the upper mold for later use; pouring concrete proportioned according to a design into a T-shaped test piece mold 11, wherein the internal dimension of the T-shaped test piece mold 11 is 10cm long, 15cm wide and 15cm high, two threaded steel bars 12 with a horizontal distance of 4cm are welded inside the T-shaped test piece mold 11 to restrict the movement of the concrete inside the T-shaped test piece mold 11, the diameter of each threaded steel bar 12 is 14mm, a PVC pipe is required to reserve an anchor rod hole with the same diameter at the center of each of an upper concrete test piece 19 and a lower concrete test piece 20 in the pouring process, and the diameter of the reserved anchor rod hole is required to be adjusted according to the test requirements (particularly emphasizing that the arrangement form of the anchor rod needs to be simulated according to the actual requirements of a design scheme and design parameters, and can be vertically arranged or obliquely arranged, so that the reserved anchor rod hole needs to be reserved according to the actual design requirements of the anchor rod);
the second step is that: clamping a T-shaped test piece die 11 and a cured lower concrete test piece 20 in an L-shaped pressing block 13, placing a prefabricated cured upper concrete test piece 19 on a rolling shaft 10 of a U-shaped guide groove 9, wherein an anchor rod hole of the upper concrete test piece 19 is vertically aligned with an anchor rod hole of the lower concrete test piece 20, inserting an anchor rod into the anchor rod hole, and pouring an anchoring agent for curing until the anchoring strength of the anchor rod reaches the test requirement;
the third step: the reinforcing steel plates 17 are connected with the U-shaped frame 6 through fastening bolts, the reinforcing steel plates 17 are arranged on the front side and the rear side of the upper concrete test piece 19, and front and rear deviation of the push plate 15 on the roller 10 in the test process of pushing the upper concrete test piece 19 is avoided;
the fourth step: installing a displacement sensor 16, and electrically connecting the displacement sensor 16, the jacking electric jack 7 and the side-pushing electric jack 14 with a control computer respectively;
the fifth step: after all the preparation work is finished, controlling the loading modes and the loading rates of the jacking electric jacks 7 and the side-pushing electric jacks 14 through a computer according to simulation parameters pre-designed in the test, respectively monitoring and recording the elongation of the jacking electric jacks 7 and the side-pushing electric jacks 14 in real time through the computer and a displacement sensor 16, and monitoring and recording the vertical displacement and the horizontal displacement of the upper concrete test specimen 19;
and a sixth step: simulating composite rock masses with different strengths according to the concrete with different label strengths according to the operations from the first step to the fifth step, and monitoring and recording the vertical displacement and the horizontal displacement of the upper concrete test specimen 19;
the seventh step: the anchoring mechanical characteristics of the composite rock anchor rod in the tension-shear state are obtained according to the analysis of the results, the tension-shear strength of the anchor rod under different composite rock conditions, namely the failure mode of anchor rod anchoring, is further proved, and theoretical reference is provided for the supporting scheme and supporting parameters of underground engineering or tunnel engineering, so that engineering technicians can select the optimal supporting scheme and supporting parameters.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The test device and the method for the anchoring mechanical property of the composite rock anchor rod in a tension-shear state comprise a U-shaped frame, and are characterized in that: jacking electric jack that two vertical symmetries of fixedly connected with set up on U type frame's the bottom plate inboard, jacking electric jack's top fixedly connected with U type guide way, all rotate in the U type guide way and be connected with many roller bearings that set up side by side, be provided with T type test piece mould on the bottom plate inboard of U type frame between two jacking electric jack, be provided with many twisted steel in the T type test piece mould, the both sides of T type test piece mould are provided with L type briquetting, T type test piece mould joint is in the space that two L type briquetting and U type frame enclose, the side thrust electric jack that the inboard fixedly connected with level of one side curb plate of U type frame set up, the push pedal of the vertical setting of end fixedly connected with of side thrust electric jack, all be provided with displacement sensor on U type guide way and the push pedal.
2. The device and the method for testing the anchoring mechanical property of the composite rock bolt according to claim 1 in the tension-shear state are characterized in that: and horizontally arranged reinforcing steel plates are detachably connected to two sides of the U-shaped frame.
3. The device and the method for testing the anchoring mechanical property of the composite rock bolt according to claim 1 in the tension-shear state are characterized in that: bearing seats are arranged between the U-shaped guide groove and two ends of each rolling shaft, and the rolling shafts are rotatably connected with the U-shaped guide grooves through the bearing seats.
4. The test method for the anchoring mechanical property of the composite rock anchor rod in a tension-shear state is characterized by comprising the following steps: the method comprises the following steps:
the first step is as follows: preparing a concrete test piece; clamping a T-shaped test piece mold in an L-shaped pressing block, preparing an upper concrete test piece and a lower concrete test piece according to designed concrete for simulating composite rock masses with different strengths, wherein the upper concrete test piece is prefabricated and poured in a mold with the length of 60cm, the width of 15cm and the height of 20cm, and removing the mold and taking out the upper mold for later use after the upper concrete test piece is cured to meet the strength requirement; pouring the proportioned concrete into a T-shaped test piece mold according to the design, wherein the internal dimension of the T-shaped test piece mold is 10cm in length, 15cm in width and 15cm in height, two threaded steel bars with the horizontal interval of 4cm are welded inside the T-shaped test piece mold to restrict the movement of the concrete inside the T-shaped test piece mold, the diameter of each threaded steel bar is 14mm, the upper concrete test piece and the lower concrete test piece both need to adopt PVC pipes to reserve anchor rod holes with the same diameter in the center of the upper concrete test piece and the lower concrete test piece in the pouring process, and the diameter of the reserved anchor rod holes needs to be adjusted according to the test requirements;
the second step: clamping the T-shaped test piece die and the cured lower concrete test piece in an L-shaped pressing block, placing the prefabricated cured upper concrete test piece on a rolling shaft of a U-shaped guide groove, wherein an anchor rod hole of the upper concrete test piece and an anchor rod hole of the lower concrete test piece are aligned up and down, inserting an anchor rod into the anchor rod hole, and pouring an anchoring agent for curing until the anchoring strength of the anchor rod meets the test requirement;
the third step: the reinforcing steel plates are connected with the U-shaped frame through fastening bolts and are arranged on the front side and the rear side of the upper concrete test piece, so that front and rear deviation of the push plate on the roller in the test process of pushing the upper concrete test piece is avoided;
the fourth step: installing a displacement sensor, and electrically connecting the displacement sensor, the jacking electric jack and the side-pushing electric jack with a control computer respectively;
the fifth step: after all the preparation work is finished, controlling the loading modes and the loading rates of the jacking electric jack and the side-pushing electric jack through a computer according to simulation parameters pre-designed in the test, respectively monitoring and recording the elongation of the jacking electric jack and the side-pushing electric jack in real time through the computer and a displacement sensor, and monitoring and recording the vertical displacement and the horizontal displacement of the upper concrete test piece;
and a sixth step: simulating composite rock masses with different strengths according to the concrete with different label strengths according to the operations from the first step to the fifth step, and monitoring and recording the vertical displacement and the horizontal displacement of the upper concrete test specimen;
the seventh step: the anchoring mechanical characteristics of the composite rock anchor rod in the tension-shear state are obtained according to the analysis of the results, the tension-shear strength of the anchor rod under different composite rock conditions, namely the failure mode of anchor rod anchoring, is further proved, and theoretical reference is provided for the supporting scheme and supporting parameters of underground engineering or tunnel engineering, so that engineering technicians can select the optimal supporting scheme and supporting parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211060586.1A CN115326570A (en) | 2022-08-31 | 2022-08-31 | Device and method for testing anchoring mechanical property of composite rock anchor rod in tension-shear state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211060586.1A CN115326570A (en) | 2022-08-31 | 2022-08-31 | Device and method for testing anchoring mechanical property of composite rock anchor rod in tension-shear state |
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| Publication Number | Publication Date |
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| CN115326570A true CN115326570A (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211060586.1A Withdrawn CN115326570A (en) | 2022-08-31 | 2022-08-31 | Device and method for testing anchoring mechanical property of composite rock anchor rod in tension-shear state |
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| CN (1) | CN115326570A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116008060A (en) * | 2023-01-10 | 2023-04-25 | 北京建筑大学 | Prefabricated composite wall insulation layer and mechanical property test device for connecting piece thereof |
-
2022
- 2022-08-31 CN CN202211060586.1A patent/CN115326570A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116008060A (en) * | 2023-01-10 | 2023-04-25 | 北京建筑大学 | Prefabricated composite wall insulation layer and mechanical property test device for connecting piece thereof |
| CN116008060B (en) * | 2023-01-10 | 2024-01-23 | 北京建筑大学 | Prefabricated composite wall insulation layer and mechanical property test device for connecting piece thereof |
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Application publication date: 20221111 |