CN108505551A - A kind of long-term anti-pulling capacity indoor test method of fiber bar anti-float anchor rod - Google Patents
A kind of long-term anti-pulling capacity indoor test method of fiber bar anti-float anchor rod Download PDFInfo
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- CN108505551A CN108505551A CN201810402364.0A CN201810402364A CN108505551A CN 108505551 A CN108505551 A CN 108505551A CN 201810402364 A CN201810402364 A CN 201810402364A CN 108505551 A CN108505551 A CN 108505551A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The invention belongs to ground foundation engineering experimental technique fields, it is related to a kind of long-term anti-pulling capacity indoor test method of fiber bar anti-float anchor rod, by test fiber bar anti-float anchor rod under long term constant load shaft stress variation and above the amount of pulling out be used for analyze creep effect and stress relaxation phenomenon of the fiber bar anti-float anchor rod under action of long-term load, obtain the long-term anti-pulling capacity of fiber bar anti-float anchor rod, lever load system is used to apply long term constant load to the fiber bar anti-float anchor rod in rock-soil layer, it is implanted into low-temperature-sensitive mini optical fibre grating sensor string in fiber bar anti-float anchor rod and tests anchor pole axial direction stress variation, automatic displacement acquisition meter is installed and measures the amount of pulling out on anchor rod body, its method is simple, construction and installation are convenient, securely and reliably, device is complete to be hardly damaged, measuring accuracy is high, operation is flexible, it is at low cost.
Description
Technical field：
The invention belongs to ground foundation engineering experimental technique field, be related to it is a kind of to fiber bar anti-float anchor rod in rock mass in length
Research and its loading method of anti-pulling capacity and stress relaxation characteristics under phase constant load action, especially a kind of fiber
The long-term anti-pulling capacity indoor test method of muscle anti-float anchor rod.
Background technology：
Anti-float anchor rod is as permanent component, it is desirable that the service life of anchor pole is decades even upper a century, the prior art
The design of middle anti-float anchor rod lays particular emphasis on short-term pulling capacity and the displacement of anchor pole, is seldom concerned about that the long-acting performance of anti-float anchor rod is (long-term
Anti-pulling capacity and TERM DEFORMATION).Currently, the design about permanent anchor pole, often uses the method for increasing safety coefficient,
There are prodigious blindness, anchor pole will produce creep and relaxation under the effect of long-term dead load, lead to anchoring load losses.In addition,
Anti-float anchor rod in Practical Project tends to fundamental test, and the pull-out test under long duration load is extremely rare, and engineering skill
Art personnel concern the long-term anti-pulling capacity of anti-float anchor rod.Since steel are perishable, anti-float anchor rod and long-term alternation of wetting and drying
Environment, especially there is the durability of reinforcing bar anti-float anchor rod in the environment of stray electrical current to be under suspicion.Fiber bar anti-float anchor rod is
A kind of novel reinforced material being combined by resin and fibrous material, compared with reinforced anchor bolt, it has preferable mechanical property
Energy, corrosion resistance, electromagnetism interference performance and excellent fatigue resistance.Chinese patent 201720304289.5 discloses
A kind of rockbolt stress characteristic research pull-out test device, including anchor pole preparation system and loading system；Anchor pole preparation system packet
System framework, backing plate, a first shell and multiple second shells are included, loading system includes axial force loading device and normal force
Loading device, the present apparatus is realized for the first time integrates anchor pole making and stress test, can first make anchor pole and be carried out again to anchor pole
Apply axial tension, analyzes the stressing conditions of anchor pole, during anchor rod drawing is tested, may be implemented to apply anchor pole body
Controllable normal stress is added to act on, the practical axial stressing conditions of approximate simulation anchor pole so that relevant anchor pole axial direction mechanical characteristic is ground
Studying carefully result seems more reasonable, applicable, preferably serves the design and construction of anchor pole, but the device is only capable of simulation bolt shaft
To with normal direction stressing conditions, the long-term anti-pulling capacity of anchor pole cannot be measured and it is analyzed；201710052406.8 disclosing
The experimental rig and method of the bolt stress meters under different operating modes are tested, this experimental rig includes test platform, test platform
Upper surface is opened up there are two orthogonal bearing track, and roller support is both provided in each bearing track, roller support
Central upper portion is provided with rotation axis, and clamping device is provided at the top of rotation axis, anchor pole, anchor are clamped between two roller supports
Be equipped among bar bolt stress meters, two strain gauges and two jack, bolt stress meters and strain gauge by data line with
Data collector connects；This method includes the following steps：(1) experimental rig is installed；(2) anchor pole is installed；(3) fixed to roll branch
Seat；(4) installation data collector；(5) anchor pole is tested；(6) data processing, the principle of the present invention is fairly simple, and mould
The state of quasi- rockbolt stress is true, but its measurement data accuracy is not high and of high cost in actual tests；
201420358169.X discloses a kind of testing stand for testing anchor pole comprehensive mechanical property, which includes being arranged in institute
State the bending that the propulsion on installation testboard pre-tightens mechanism for testing with mixing test mechanism, installation and is arranged on work testboard
Load test mechanism, axial load mechanism for testing, shear-type load mechanism for testing and shock loading mechanism for testing；Pass through the testing stand
Experiment indoor simulation rockbolt installation and the course of work are may be implemented in, and torsion, stretching, bending, shearing and impact are applied to anchor pole
Equal individual events or multinomial group of bonding force；Respective loads are applied to anchor pole using mutually independent loading system, anchor pole can be carried out respectively
The independent experiment of installation and various load in the course of work can also carry out installation stress and be stretched caused by surrouding rock deformation, be cut
The combination load test with several arbitrary work stress such as impacts is cut, to which validity test anchor pole is in various different force group cooperations
Comprehensive mechanical property under, but the testing stand is mainly used for mine support, and also it is complicated, it is inconvenient.It seeks as a result,
A kind of reasonable, fast and effectively fiber bar anti-float anchor rod long-term anti-pulling capacity test device is sought, for determining anti-float anchor rod
TERM DEFORMATION feature and stress relaxation characteristics have highly important theory significance and engineering application value.
Invention content：
Present invention aims to overcome that disadvantage of the existing technology, in cost-effective, guarantee test quality, improves and tests
Under the premise of efficiency, a kind of long-term anti-pulling capacity indoor test side of fiber bar anti-float anchor rod is provided using lever principle design
Method, by test fiber bar anti-float anchor rod under long term constant load shaft stress variation and above the amount of pulling out for analyze fiber bar resist
Creep effect and stress relaxation phenomenon of the drogue bar under action of long-term load, the long-term resistance to plucking for obtaining fiber bar anti-float anchor rod are held
Power is carried, that is, uses lever load system to apply long term constant load to the fiber bar anti-float anchor rod in rock-soil layer, in fiber bar
It is implanted into low-temperature-sensitive mini optical fibre grating sensor string in anti-float anchor rod and tests anchor pole axial direction stress variation, installation automatic displacement acquisition
Meter measures the amount of pulling out on anchor rod body.
To achieve the goals above, the present invention carries out indoor test device in the long-term anti-pulling capacity of fiber bar anti-float anchor rod
Middle realization, detailed process are：
(1) lever load system is installed, is first fixed rigid base on rigid ground with earth anchor screw rod and earth anchor nut,
Then the first column and the second column are welded on rigid base, and weld rib in the suspension column of the first column and the second column respectively
Plate increases its stability, and when welding ensures hanging down for the first column, the fusion length of the second column and floor and intensity and column
Straight degree, then builds lever, first first crossbeam fixing axle and third crossbeam fixing axle is used to distinguish first crossbeam and third crossbeam
It is connect with the first column and the second column, and builds support temporarily and ensure that first crossbeam and third crossbeam are horizontal, then with first
Crossbeam connecting rod fixing axle, second cross beam connecting rod fixing axle, first crossbeam connecting rod and second cross beam connecting rod installation second are horizontal
Beam finally installs third crossbeam connecting rod with third crossbeam connecting rod fixing axle on third crossbeam, is needed when installing above-mentioned fixing axle
Coating butter, and external support is added only to make the holding of third crossbeam horizontal, lever load system installs；
(2) the fiber bar anti-float anchor rod body of rod is installed：The fibre for first taking root in low-temperature-sensitive mini optical fibre grating sensor string by two
The dimension muscle anti-float anchor rod body of rod is each passed through the preformed hole of first crossbeam left end and second cross beam right end, then with high-strength nut, nut
Gasket sequentially passes through the fiber bar anti-float anchor rod body of rod positioned at reserved hole site above section from top to bottom, in a manner of screw thread couple
It is securely fixed, to ensure anchorage length of the fiber bar anti-float anchor rod body of rod in concrete substrate, anchorage length before installation
It is determined by test requirements document, and ensures the verticality of the fiber bar anti-float anchor rod body of rod by the rigid holder of guiding, in whole installation process
Pay attention to protecting low-temperature-sensitive mini optical fibre grating sensor without damage；
(3) bottom plate anchor structure is formed：It is long that outer surface painting organic oil is first inserted on the base threaded hole 24 of rigid base
The pvc pipe of 1.2m, diameter 5cm, are used in combination white glue band to seal the upper top surface of base threaded hole in order to avoid slurries flow into, then holder coagulation
The template of soil matrix body, assembling reinforcement, and ensure the relative position of concrete substrate and the fiber bar anti-float anchor rod body of rod, finally pour
Concrete for making standard specimen was conserved to age, and took out pvc pipe to form bottom plate anchor structure before concrete final set；
(4) first concrete substrate is fixed on rigid base with high-strength bolt and steel cushion block, is existed with commercially available structure glue
The bar wing is pasted on the fiber bar anti-float anchor rod body of rod, the interim banding fixed of tied silk, maintenance is used in combination, and waits for structure glue natural conditions maintenance 1
It again dismantles tied silk after being fully cured, and four are then set up on the bar wing and concrete substrate certainly respectively with movable clamping device
Dynamic displacement acquisition meter, and automatic displacement acquisition meter is series-connected to external acquisition system with low-temperature-sensitive mini optical fibre grating sensor
On system, the half of (0.1 times that estimates ultimate load) amount of pre-applied first order load, and initial reading is recorded, it rejects and quickly adds
Then test error caused by load applies the clump weight weight needed for long duration load, starts to test；
(5) reading data are surveyed, point different time sections and time point are observed experiment, long to obtain fiber bar anti-float anchor rod
The criterion that deflection under phase constant load, experiment Load-unload and termination loading environment and anchor pole destroy is pressed《Build base
Cheat support technology regulation》(JGJ120-2012) it executes).
The agent structure that the long-term anti-pulling capacity of fiber bar anti-float anchor rod of the present invention carries out indoor test device includes
Rigid base, earth anchor screw rod, earth anchor nut, the first column, the second column, floor, first crossbeam, second cross beam, third crossbeam,
Fixing axle, first crossbeam connecting rod, second cross beam connecting rod, third crossbeam connecting rod, counterweight, high-strength nut, nut shim, activity clamping
Device, be oriented to steel bracket, automatic displacement acquisition meter, the fiber bar anti-float anchor rod body of rod, low-temperature-sensitive mini optical fibre grating sensor string,
Concrete substrate, high-strength bolt, base threaded hole, steel cushion block, the bar wing, third crossbeam fixing axle, first crossbeam connecting rod fixing axle,
Second cross beam connecting rod fixing axle, third crossbeam connecting rod fixing axle；Rigid base, earth anchor screw rod, ground anchor bolt, the first column,
Two columns, floor, first crossbeam, second cross beam, third crossbeam, first crossbeam fixing axle, first crossbeam connecting rod, second cross beam connect
Bar, third crossbeam connecting rod, clump weight, third crossbeam fixing axle, first crossbeam connecting rod fixing axle, second cross beam connecting rod fixing axle,
Third crossbeam connecting rod fixing axle forms lever load system, and the quadrangle of rigid base is reserved with the hole of diameter 7cm, earth anchor screw rod
The hole reserved across rigid base is of coupled connections with earth anchor nut, and rigid base is anchored at by earth anchor screw rod and earth anchor nut
On rigid ground, the first column and the second column are welded on rigid base vertically respectively, the column of the first column and the second column
Floor is welded at foot, the stability for increasing the first column and the second column；One end of first crossbeam passes through the first cross
Beam fixing axle is horizontally fixed on the first column, is welded with the first crossbeam connecting rod being fixed on second cross beam below the other end,
First crossbar connecting rod is fixed on the right part of second cross beam by first crossbeam connecting rod fixing axle straight up, second cross beam connecting rod
One end is fixed on by second cross beam connecting rod fixing axle on third crossbeam straight up, and the other end is welded under second cross beam left part
Side, one end of third crossbeam connecting rod is fixed on by third crossbeam connecting rod fixing axle on third crossbeam straight down, the other end with
Clump weight connects；The left end of first crossbeam and the right end of second cross beam are inserted vertically into the fiber bar anti-float anchor rod body of rod respectively, high-strength
Nut and nut shim collectively form the drawing anchorage of the fiber bar anti-float anchor rod body of rod, the fiber bar anti-float anchor rod body of rod and high-strength spiral shell
Mother is connected by screw thread couple, and nut shim is mounted between the fiber bar anti-float anchor rod body of rod and high-strength nut, rigid base
Both ends are symmetrically installed with guiding steel bracket, and the fiber bar anti-float anchor rod body of rod is interior to be implanted with low-temperature-sensitive mini optical fibre grating with quasi-distributed
Sensor string, eliminating the grating parameter variation that temperature band is come to the maximum extent influences accurately to measure fibre under action of long-term load
Tie up the deflection of the muscle anti-float anchor rod body of rod；The lower end of the fiber bar anti-float anchor rod body of rod is placed in concrete substrate, concrete substrate
Four angles at be vertically provided with base threaded hole, high-strength bolt is connect across base threaded hole with steel cushion block, high-strength bolt, pedestal
Threaded hole, steel cushion block collectively form the anchor system of concrete substrate, and concrete substrate is fixedly mounted on just by anchor system
Property pedestal on, movable clamping device, automatic displacement acquisition meter, the bar wing collectively form displacement test system, and movable clamping device is used
In setting up automatic displacement acquisition meter, the geometrical clamp of movable clamping device one end is screwed to be fixed on and is oriented on rigid holder, can be upper and lower
It is flexibly mobile, automatic displacement acquisition meter be used for measuring in concrete substrate on the amount of pulling out, the bar wing is pasted onto fibre using epoxy resin
It ties up on the muscle anti-float anchor rod body of rod at the 5cm of concrete substrate top surface, test body of rod deflection is provided for automatic displacement acquisition meter
Measuring point.
Rigid base of the present invention is made of the steel rectangle bottom plate of long 2.4m, width 1.2m, thickness 5cm；Earth anchor spiral shell
Bar uses the steel body of casting, one end of earth anchor screw rod to be designed as the expansion header structure of long 25cm, width 10cm, high 10cm, and the other end is band
There are the cylindrical structure of screw thread, diameter 6cm；Earth anchor nut uses wall thickness for the steel body of casting of 4cm, pass through screw thread couple mode and ground
Anchor screw rod connects；First column and the second column are all made of 140mm × 60mm × 8mm channel steels, the first column and the second column
The reserved diameter 50mm holes in capital, are respectively used to installation first crossbeam fixing axle and third crossbeam fixing axle；First crossbeam is solid
Dead axle, third crossbeam fixing axle, first crossbeam connecting rod fixing axle, second cross beam connecting rod fixing axle and third crossbeam connecting rod fixing axle
It is connected and is formed with high-strength nut screw thread couple by high-strength pin, wherein the height of first crossbeam fixing axle, third crossbeam fixing axle
The a diameter of 40mm of strength bolt, first crossbeam connecting rod fixing axle, second cross beam connecting rod fixing axle and third crossbeam connecting rod fixing axle
High-strength pin a diameter of 30mm needs coating butter to reduce friction when installing above-mentioned fixing axle；Floor uses the steel of thickness 0.8cm
Material, shape are right-angled trapezium, a length of 20cm in top, following a length of 30cm, a height of 30cm；First crossbeam, second cross beam,
Three crossbeams adopt wide 8cm, thickness 12cm steel materials, and length is respectively 1.6m, 1.3m, 1.0m first crossbeam and third crossbeam point
The bore dia not being connected with the first column and the second column is 50mm, hole that second cross beam is connected with first crossbeam connecting rod, third
The bore dia that crossbeam is connected with second cross beam connecting rod and third crossbeam connecting rod respectively is 40mm, the left end of first crossbeam and second
The right end of crossbeam is reserved for the hole that the fiber bar anti-float anchor rod body of rod passes through respectively, and aperture is slightly larger than fiber bar anti-float anchor rod bar
The diameter of body；First crossbeam connecting rod, second cross beam connecting rod, third crossbeam connecting rod are all made of the steel of long 30cm, width 6cm, thickness 2cm
Prepared material.
The rigid holder of guiding of the present invention is welded using plain bar, and that welds thereon is used to ensure fiber bar anti-floating
A steel ring is welded on the guide rod of anchor rod body verticality, steel ring diameter is slightly larger than fiber bar anti-float anchor rod shank diameter；It is high
It is circular ring shape steel disc that strong nut, which uses the hex nut of wall thickness 3cm, nut shim, and internal diameter is slightly larger than fiber bar anti-float anchor rod bar
The diameter of body, outer diameter are more than the outer diameter of high-strength nut；The bar wing uses the angle bar and internal diameter 2cm, wall thickness of 5cm × 5cm × 0.5cm
The semicircle steel pipe of 0.3cm is welded, and the fiber bar anti-float anchor rod body of rod is that glass fiber reinforced polymer (GFRP) full thread is real
Heart rod-like structure, concrete substrate are used for simulation rock, generally use the cast-in-situ steel reinforced concrete of high 1m, long 60cm, width 60cm
Rectangular parallelepiped structure, strength grade of concrete are determined that reinforcing bar uses HRB400 by the uniaxial compressive strength of rock；High-strength bolt uses
The hole depth of the threaded steel rod piece of lower end system, a diameter of 5cm, a length of 2.2m, base threaded hole is 3cm, and steel cushion block is 8cm
The rectangular bloom of × 8cm × 4cm, center are formed with the circular hole of aperture 6cm.
Activity clamping device of the present invention is by geometrical clamp, magnetic attraction pedestal, first direction adjuster, the first steel chain
Bar, second direction adjuster, the second steel chain bar, guide clip holder composition, geometrical clamp are fixed on guiding in a manner of screwing clamping
On rigid holder, magnetic attraction pedestal magnetic-adsorption is on the perpendicular of geometrical clamp, one end and the magnetism of first direction adjuster
Suction mount is welded, and the other end is fixedly connected with the first steel chain bar, and one end of second direction adjuster is connected with the first steel chain bar,
The other end is connected with the second steel chain bar, is fixed by fastening bolt between the first steel chain bar and the second steel chain bar, the first steel chain bar
With the length and angle of the second steel chain bar can flexible modulation, one end of guide clip holder one end and the second steel chain bar is with screw thread coupling
Conjunction mode connects, and the other end is installed with automatic displacement acquisition meter by fastening bolt, and guide clip holder is mounted on the second steel
Between chain bar and automatic displacement acquisition meter, the upper surface of guide clip holder is formed with spirit level, horizontal for adjusting guide clip holder,
Ensure the verticality of automatic displacement acquisition meter, and then keeps displacement measurement accurate.
The present invention is before use, the formwork of concrete substrate, pour and the installation of the fiber bar anti-float anchor rod body of rod is all to try
It is carried out on experiment device, and ensures fiber bar anti-float anchor rod body of rod axial tension in drawing；Ensure that low-temperature-sensitive is miniature before experiment
Fiber-optic grating sensor string and automatic displacement acquisition meter normal work, and acquire primary data；Institute is calculated by standing balance
The clump weight weight that need to apply.
The present invention since the rock of specific shape is difficult to obtain, that is, allow to get cannot guarantee that drilling after still keep it
Integrality, therefore with cast-in-place 2 simulation rock of coagulation soil matrix, the anchoring for simulating the fiber bar anti-float anchor rod body of rod and basement rock.
Compared with prior art, the present invention its method is simple, construction and installation are convenient, securely and reliably, the complete not rapid wear of device
Bad, measuring accuracy is high, and operation is flexible, at low cost, is capable of providing persistently constant pulling capacity, can effectively improve anchor pole anti-floating energy
Power, while testing fiber bar anti-float anchor rod shaft stress variation and the upper amount of pulling out under long term constant load.
Description of the drawings：
Fig. 1 is the agent structure that the long-term anti-pulling capacity of fiber bar anti-float anchor rod of the present invention carries out indoor test device
Schematic diagram.
Fig. 2 is agent structure vertical view of the present invention.
Fig. 3 is the principle schematic diagram of earth anchor screw rod of the present invention.
Fig. 4 is the principle schematic diagram of first crossbeam fixing axle of the present invention, wherein (a) is front view, it is (b) to bow
View.
Fig. 5 is the structure top view of high-strength nut of the present invention.
Fig. 6 is the structure top view of nut shim of the present invention.
Fig. 7 is the agent structure principle schematic of movable clamping device of the present invention.
Fig. 8 is the principle schematic diagram of high-strength bolt of the present invention.
Fig. 9 is the agent structure principle schematic of the bar wing of the present invention, wherein (a) is front view, it is (b) vertical view.
Specific implementation mode：
The invention will be further described by way of example and in conjunction with the accompanying drawings.
Embodiment：
The present embodiment thinks that fiber bar anti-float anchor rod long-term anti-pulling capacity realized in indoor test device, specific mistake
Cheng Wei：
(1) lever load system is installed, is first consolidated rigid base 1 on rigid ground with earth anchor screw rod 2 and earth anchor nut 3
It is fixed, the first column 4 and the second column 5 are then welded on rigid base 1, and respectively in the column of the first column 4 and the second column 5
Foot welds floor 6 and increases its stability, and when welding ensures the fusion length and intensity of the first column 4, the second column 5 and floor 6
And then the verticality of column builds lever in ± 1mm, first use first crossbeam fixing axle 10 and third crossbeam fixing axle 27 will
First crossbeam 7 and third crossbeam 9 are connect with the first column 4 and the second column 5 respectively, and are built support temporarily and ensured first crossbeam
7 and third crossbeam 9 it is horizontal, then use first crossbeam connecting rod fixing axle 28, second cross beam connecting rod fixing axle 29, first crossbeam
Connecting rod 11 and second cross beam connecting rod 12 install second cross beam 8, finally use third crossbeam connecting rod fixing axle 30 in third crossbeam 9
Upper installation third crossbeam connecting rod 13 needs coating butter, and external support is added only to protect third crossbeam 9 when installing above-mentioned fixing axle
Water holding is flat, and lever load system installs；
(2) the installation fiber bar anti-float anchor rod body of rod 20：First low-temperature-sensitive mini optical fibre grating sensor string 21 has been taken root in by two
The fiber bar anti-float anchor rod body of rod 20 be each passed through the preformed hole of 8 right end of 7 left end of first crossbeam and second cross beam, then with high-strength spiral shell
Mother 15, nut shim 16 sequentially pass through the fiber bar anti-float anchor rod body of rod 20 positioned at reserved hole site above section from top to bottom,
It is securely fixed in a manner of screw thread couple, to ensure the fiber bar anti-float anchor rod body of rod 20 in concrete substrate 22 before installation
Anchorage length, anchorage length are determined by test requirements document, and ensure the fiber bar anti-float anchor rod body of rod 20 by rigid holder 18 is oriented to
Verticality pays attention to protecting low-temperature-sensitive mini optical fibre grating sensor without damage in ± 1mm, whole installation process；
(3) bottom plate anchor structure is formed：It is long that outer surface painting organic oil is first inserted on the base threaded hole 24 of rigid base 1
The pvc pipe of 1.2m, diameter 5cm are used in combination white glue band to seal the upper top surface of base threaded hole 24 in order to avoid slurries flow into, and then holder is mixed
The template of solidifying soil matrix body 22, assembling reinforcement, and ensure the relative position of concrete substrate 22 and the fiber bar anti-float anchor rod body of rod 20,
Last casting concrete makes standard specimen and conserves to age, and takes out pvc pipe to form bottom plate anchoring before concrete final set
Structure；
(4) first concrete substrate 22 is fixed on rigid base 1 with high-strength bolt 23 and steel cushion block 25, with commercially available knot
Structure glue pastes the bar wing 26 on the fiber bar anti-float anchor rod body of rod 20, and the interim banding fixed of tied silk, maintenance is used in combination, and waits for structure glue nature
Condition maintenance again dismantles tied silk after being fully cured within 1 day, then uses movable clamping device 17 respectively in the bar wing 26 and coagulation soil matrix
Four automatic displacement acquisition meters 19 are set up on body 22, and 19 and low-temperature-sensitive mini optical fibre grating sensor are counted into automatic displacement acquisition
String 21 is connected in external acquisition system, the half of (0.1 times that estimates ultimate load) amount of pre-applied first order load, and is remembered
Initial reading is recorded, quickly test error caused by load is rejected, then applies the weight of the clump weight 14 needed for long duration load, open
Begin to test；
(5) reading data are surveyed, point different time sections and time point are observed experiment, long to obtain fiber bar anti-float anchor rod
The criterion that deflection under phase constant load, experiment Load-unload and termination loading environment and anchor pole destroy is pressed《Build base
Cheat support technology regulation》(JGJ120-2012) it executes).
The long-term anti-pulling capacity of fiber bar anti-float anchor rod described in the present embodiment carries out the agent structure of indoor test device
It is horizontal including rigid base 1, earth anchor screw rod 2, earth anchor nut 3, the first column 4, the second column 5, floor 6, first crossbeam 7, second
Beam 8, third crossbeam 9, fixing axle 10, first crossbeam connecting rod 11, second cross beam connecting rod 12, third crossbeam connecting rod 13, clump weight 14,
High-strength nut 15, movable clamping device 17, is oriented to steel bracket 18, automatic displacement acquisition meter 19, fiber bar anti-floating at nut shim 16
Anchor rod body 20, low-temperature-sensitive mini optical fibre grating sensor string 21, concrete substrate 22, high-strength bolt 23, base threaded hole 24,
Steel cushion block 25, the bar wing 26, third crossbeam fixing axle 27, first crossbeam connecting rod fixing axle 28, second cross beam connecting rod fixing axle 29,
Three crossbeam connecting rod fixing axles 30；Rigid base 1, earth anchor screw rod 2, ground anchor bolt 3, the first column 4, the second column 5, floor 6,
One crossbeam 7, second cross beam 8, third crossbeam 9, first crossbeam fixing axle 10, first crossbeam connecting rod 11, second cross beam connecting rod 12,
Three crossbeam connecting rods 13, counterweight 14, third crossbeam fixing axle 27, first crossbeam connecting rod fixing axle 28, second cross beam connecting rod fixing axle
29, third crossbeam connecting rod fixing axle 30 forms lever load system, and the quadrangle of rigid base 1 is reserved with the hole of diameter 7cm, ground
The hole that anchor screw rod 2 passes through rigid base 1 to reserve is of coupled connections with earth anchor nut 3, and rigid base 1 passes through earth anchor screw rod 2 and ground
Anchor nut 3 is anchored on rigid ground, and the first column 4 and the second column 5 are welded on rigid base 1 vertically respectively, and first is vertical
It is welded with floor 6 at the suspension column of column 4 and the second column 5, the stability for increasing the first column 4 and the second column 5；First
One end of crossbeam 7 is horizontally fixed on by first crossbeam fixing axle 10 on the first column 4, below the other end be fixed on the second cross
First crossbeam connecting rod 11 on beam 8 welds, and first crossbar connecting rod 11 is fixed straight up by first crossbeam connecting rod fixing axle 28
It is fixed on straight up by second cross beam connecting rod fixing axle 29 in one end of the right part of second cross beam 8, second cross beam connecting rod 12
On third crossbeam 9, the other end is welded below 8 left part of second cross beam, and one end of third crossbeam connecting rod 13 is connected by third crossbeam
Bar fixing axle 30 is fixed on straight down on third crossbeam 9, and the other end is connect with clump weight 14；The left end of first crossbeam 7 and
The right end of two crossbeams 8 is inserted vertically into the fiber bar anti-float anchor rod body of rod 20 respectively, and high-strength nut 15 and nut shim 16 collectively form
The drawing anchorage of the fiber bar anti-float anchor rod body of rod 20, the fiber bar anti-float anchor rod body of rod 20 are connected with high-strength nut 15 by screw thread couple
It connects, nut shim 16 is mounted between the fiber bar anti-float anchor rod body of rod 20 and high-strength nut 15, and the both ends of rigid base 1 are symmetrically pacified
Equipped with steel bracket 18 is oriented to, the fiber bar anti-float anchor rod body of rod 20 is interior to be implanted with low-temperature-sensitive mini optical fibre grating sensor with quasi-distributed
String 21, eliminating the grating parameter variation that temperature band is come to the maximum extent influences accurately to measure fiber bar under action of long-term load
The deflection of the anti-float anchor rod body of rod 20；The lower end of the fiber bar anti-float anchor rod body of rod 20 is placed in concrete substrate 22, coagulation soil matrix
Base threaded hole 24 is vertically provided at four angles of body 22, high-strength bolt 23 is connect across base threaded hole 24 with steel cushion block 25,
High-strength bolt 23, base threaded hole 24, steel cushion block 25 collectively form the anchor system of concrete substrate 22, and concrete substrate 22 is logical
It crosses anchor system to be fixedly mounted on rigid base 1, movable clamping device 17, automatic displacement acquisition meter 19,26 common structure of the bar wing
At displacement test system, movable clamping device 17 by setting up 19 based on automatic displacement acquisition, consolidate by 17 one end of movable clamping device
Clamp 17-1 is screwed to be fixed on and is oriented on rigid holder 18, can flexibly be moved up and down, and automatic displacement acquisition meter 19 is used for measuring mixed
The amount of pulling out in solidifying soil matrix body 22, the bar wing 26 are pasted onto on the fiber bar anti-float anchor rod body of rod 20 using epoxy resin apart from concrete
At 22 top surface 5cm of matrix, the measuring point of test body of rod deflection is provided for automatic displacement acquisition meter 19.
Rigid base 1 described in the present embodiment is made of the steel rectangle bottom plate of long 2.4m, width 1.2m, thickness 5cm；Earth anchor
Screw rod 2 uses the steel body of casting, and one end of earth anchor screw rod 2 is designed as the expansion header structure of long 25cm, width 10cm, high 10cm, the other end
To be threaded, the cylindrical structure of diameter 6cm；Earth anchor nut 3 uses wall thickness for the steel body of casting of 4cm, pass through screw thread couple mode
It is connect with earth anchor screw rod 2；First column 4 and the second column 5 are all made of 140mm × 60mm × 8mm channel steels, the first column 4 and
The reserved diameter 50mm holes in the capital of two columns 5, are respectively used to installation first crossbeam fixing axle 10 and third crossbeam fixing axle
27；First crossbeam fixing axle 10, third crossbeam fixing axle 27, first crossbeam connecting rod fixing axle 28, second cross beam connecting rod fixing axle
29 are connected with high-strength nut screw thread couple by high-strength pin with third crossbeam connecting rod fixing axle 30 and form, and wherein first crossbeam is solid
The a diameter of 40mm of high-strength bolt of dead axle 10, third crossbeam fixing axle 27, first crossbeam connecting rod fixing axle 28, second cross beam connecting rod
The a diameter of 30mm of high-strength pin of fixing axle 29 and third crossbeam connecting rod fixing axle 30, coating butter is needed when installing above-mentioned fixing axle
To reduce friction；Floor 6 is using the steel material of thickness 0.8cm, and shape is right-angled trapezium, a length of 20cm in top, and the lower length of side 2 is
30cm, a height of 30cm；First crossbeam 7, second cross beam 8, third crossbeam 9 adopt wide 8cm, thickness 12cm steel materials, length point
It Wei not the bore dia that is connected respectively with the first column 4 and the second column 5 of 1.6m, 1.3m, 1.0m first crossbeam 7 and third crossbeam 9
For 50mm, hole that second cross beam 8 is connected with first crossbeam connecting rod 11, third crossbeam 9 respectively with second cross beam connecting rod 12 and third
The connected bore dia of crossbeam connecting rod 13 is 40mm, and the left end of first crossbeam 7 is reserved for fiber respectively with the right end of second cross beam 8
The hole that the muscle anti-float anchor rod body of rod 20 passes through, aperture are slightly larger than the diameter of the fiber bar anti-float anchor rod body of rod 20；First crossbeam connects
Bar 11, second cross beam connecting rod 12, third crossbeam connecting rod 13 are all made of the steel material of long 30cm, width 6cm, thickness 2cm.
It is oriented to rigid holder 18 described in the present embodiment to be welded using plain bar, that welds thereon is used to ensure fiber bar
A steel ring is welded on the guide rod of 20 verticality of the anti-float anchor rod body of rod, steel ring diameter is slightly larger than the fiber bar anti-float anchor rod body of rod 20
Diameter；High-strength nut 15 is using the hex nut of wall thickness 3cm, and nut shim 16 is circular ring shape steel disc, and internal diameter is slightly larger than fiber
The diameter of the muscle anti-float anchor rod body of rod 20, outer diameter are more than the outer diameter of high-strength nut 15；The bar wing 26 uses the angle of 5cm × 5cm × 0.5cm
The semicircle steel pipe of iron and internal diameter 2cm, wall thickness 0.3cm are welded, and the fiber bar anti-float anchor rod body of rod 20 is glass fiber reinforced polyester
Object (GFRP) full thread solid rod-like structure is closed, concrete substrate 22 is used for simulation rock, generally uses high 1m, long 60cm, width
The cast-in-situ steel reinforced concrete rectangular parallelepiped structure of 60cm, strength grade of concrete determine that reinforcing bar is adopted by the uniaxial compressive strength of rock
Use HRB400；High-strength bolt 23 uses the threaded steel rod piece of lower end system, a diameter of 5cm, a length of 2.2m, base threaded hole
24 hole depth is 3cm, and steel cushion block 25 is the rectangular bloom of 8cm × 8cm × 4cm, and center is formed with the circular hole of aperture 6cm.
Movable clamping device 17 described in the present embodiment is adjusted by geometrical clamp 17-1, magnetic attraction pedestal 17-2, first direction
Device 17-3, the first steel chain bar 17-4, second direction adjuster 17-5, the second steel chain bar 17-6, guide clip holder 17-7 compositions, Gu
Clamp 17-1 is fixed in a manner of screwing clamping to be oriented on rigid holder 18, and magnetic attraction pedestal 17-2 magnetic-adsorptions are in geometrical clamp
On the perpendicular of 17-1, one end and the magnetic attraction pedestal 17-2 of first direction adjuster 17-3 are welded, the other end and first
Steel chain bar 17-4 is fixedly connected, and one end of second direction adjuster 17-5 is connected with the first steel chain bar 17-4, the other end and second
Steel chain bar 17-6 is connected, and is fixed by fastening bolt between the first steel chain bar 17-4 and the second steel chain bar 17-6, the first steel chain bar
The length and angle of 17-4 and the second steel chain bar 17-6 can flexible modulation, guide clip one end holder 17-7 and the second steel chain bars
One end of 17-6 is connected in a manner of screw thread couple, and the other end is installed with automatic displacement acquisition meter 19 by fastening bolt, leads
It is mounted between the second steel chain bar 17-6 and automatic displacement acquisition meter 19 to clamper 17-7, the upper surface of guide clip holder 17-7
It is formed with spirit level, it is horizontal for adjusting guide clip holder 17-7, it is ensured that the verticality of automatic displacement acquisition meter 19, and then make displacement
Test is accurate.
Claims (5)
1. a kind of long-term anti-pulling capacity indoor test method of fiber bar anti-float anchor rod, it is characterised in that in fiber bar anti-float anchor rod
It is realized in long-term anti-pulling capacity progress indoor test device, detailed process is：
(1) lever load system is installed, is first fixed rigid base on rigid ground with earth anchor screw rod and earth anchor nut, then
First column and the second column are welded on rigid base, and increased respectively in the suspension column of the first column and the second column welding floor
Add its stability, when welding ensure the first column, the fusion length of the second column and floor and intensity and column verticality,
Then lever is built, first uses first crossbeam fixing axle and third crossbeam fixing axle by first crossbeam and third crossbeam respectively with first
Column and the connection of the second column, and build support temporarily and ensure that first crossbeam and third crossbeam are horizontal, then connected with first crossbeam
Extension bar fixing axle, second cross beam connecting rod fixing axle, first crossbeam connecting rod and second cross beam connecting rod install second cross beam, finally
With third crossbeam connecting rod fixing axle third crossbeam connecting rod is installed on third crossbeam, Huang need to be smeared when above-mentioned fixing axle is installed
Oil, and external support is added only to make the holding of third crossbeam horizontal, lever load system installs；
(2) the fiber bar anti-float anchor rod body of rod is installed：The fiber bar for first taking root in low-temperature-sensitive mini optical fibre grating sensor string by two
The anti-float anchor rod body of rod is each passed through the preformed hole of first crossbeam left end and second cross beam right end, then with high-strength nut, nut shim
The fiber bar anti-float anchor rod body of rod positioned at reserved hole site above section is sequentially passed through from top to bottom, by it in a manner of screw thread couple
It securely fixes, to ensure anchorage length of the fiber bar anti-float anchor rod body of rod in concrete substrate before installation, anchorage length is by examination
It tests requirement to determine, and ensure the verticality of the fiber bar anti-float anchor rod body of rod by rigid holder is oriented to, pay attention in whole installation process
Protect low-temperature-sensitive mini optical fibre grating sensor without damage；
(3) bottom plate anchor structure is formed：The first long 1.2m of insertion outer surface painting organic oil on the base threaded hole 24 of rigid base,
The pvc pipe of diameter 5cm, is used in combination white glue band to seal the upper top surface of base threaded hole in order to avoid slurries flow into, then holder coagulation soil matrix
The template of body, assembling reinforcement, and ensure the relative position of concrete substrate and the fiber bar anti-float anchor rod body of rod, finally pour coagulation
Soil makes standard specimen and conserves to age, and takes out pvc pipe to form bottom plate anchor structure before concrete final set；
(4) first concrete substrate is fixed on rigid base with high-strength bolt and steel cushion block, with commercially available structure glue in fiber
On the muscle anti-float anchor rod body of rod paste the bar wing, the interim banding fixed of tied silk, maintenance is used in combination, wait for structure glue natural conditions maintenance 1 day it is complete
Tied silk is dismantled again after all solidstate, then sets up four automatic positions on the bar wing and concrete substrate respectively with movable clamping device
Acquisition meter is moved, and automatic displacement acquisition meter is series-connected to external acquisition system with low-temperature-sensitive mini optical fibre grating sensor
On, the half of pre-applied first order capacity value, and initial reading is recorded, quickly test error caused by load is rejected, is then applied
Add the clump weight weight needed for long duration load, starts to test；
(5) reading data are surveyed, point different time sections and time point are observed experiment, permanent for a long time to obtain fiber bar anti-float anchor rod
The criterion that deflection under constant load, experiment Load-unload and termination loading environment and anchor pole destroy is pressed《Building foundation pit branch
Protect technical regulation》(JGJ120-2012) it executes).
2. the long-term anti-pulling capacity indoor test method of fiber bar anti-float anchor rod according to claim 1, it is characterised in that institute
It includes rigid base, earth anchor spiral shell to state the long-term anti-pulling capacity of fiber bar anti-float anchor rod and carry out the agent structure of indoor test device
Bar, earth anchor nut, the first column, the second column, floor, first crossbeam, second cross beam, third crossbeam, fixing axle, first crossbeam
Connecting rod, third crossbeam connecting rod, counterweight, high-strength nut, nut shim, movable clamping device, is oriented to steel branch at second cross beam connecting rod
Frame, automatic displacement acquisition meter, the fiber bar anti-float anchor rod body of rod, low-temperature-sensitive mini optical fibre grating sensor string, concrete substrate, height
Strength bolt, base threaded hole, steel cushion block, the bar wing, third crossbeam fixing axle, first crossbeam connecting rod fixing axle, second cross beam connecting rod
Fixing axle, third crossbeam connecting rod fixing axle；Rigid base, earth anchor screw rod, ground anchor bolt, the first column, the second column, floor,
First crossbeam, second cross beam, third crossbeam, first crossbeam fixing axle, first crossbeam connecting rod, second cross beam connecting rod, third crossbeam
Connecting rod, clump weight, third crossbeam fixing axle, first crossbeam connecting rod fixing axle, second cross beam connecting rod fixing axle, third crossbeam connecting rod
Fixing axle forms lever load system, and the quadrangle of rigid base is reserved with the hole of diameter 7cm, and earth anchor screw rod passes through rigid base
Reserved hole is of coupled connections with earth anchor nut, and rigid base is anchored at by earth anchor screw rod and earth anchor nut on rigid ground,
First column and the second column are welded on rigid base vertically respectively, are welded at the suspension column of the first column and the second column
Floor, the stability for increasing the first column and the second column；One end of first crossbeam is horizontal by first crossbeam fixing axle
It is fixed on the first column, is welded with the first crossbeam connecting rod being fixed on second cross beam below the other end, first crossbar connecting rod
It is fixed on the right part of second cross beam straight up by first crossbeam connecting rod fixing axle, one end of second cross beam connecting rod passes through second
Crossbeam connecting rod fixing axle is fixed on straight up on third crossbeam, and the other end is welded below second cross beam left part, third crossbeam
One end of connecting rod is fixed on by third crossbeam connecting rod fixing axle on third crossbeam straight down, and the other end is connect with clump weight；
The left end of first crossbeam and the right end of second cross beam are inserted vertically into the fiber bar anti-float anchor rod body of rod, high-strength nut and nut pad respectively
Piece collectively forms the drawing anchorage of the fiber bar anti-float anchor rod body of rod, and the fiber bar anti-float anchor rod body of rod passes through screw thread coupling with high-strength nut
Connection is closed, nut shim is mounted between the fiber bar anti-float anchor rod body of rod and high-strength nut, and the both ends of rigid base are symmetrically installed
There is guiding steel bracket, the fiber bar anti-float anchor rod body of rod is interior to be implanted with low-temperature-sensitive mini optical fibre grating sensor string, energy with quasi-distributed
Eliminating the grating parameter variation that temperature band is come influences accurately to measure the fiber bar anti-float anchor rod body of rod under action of long-term load
Deflection；The lower end of the fiber bar anti-float anchor rod body of rod is placed in concrete substrate, is vertically provided at four angles of concrete substrate
Base threaded hole, high-strength bolt are connect across base threaded hole with steel cushion block, and high-strength bolt, base threaded hole, steel cushion block are common
The anchor system of concrete substrate is constituted, concrete substrate is fixedly mounted on by anchor system on rigid base, activity clamping
Device, automatic displacement acquisition meter, the bar wing collectively form displacement test system, and movable clamping device is for setting up automatic displacement acquisition
Meter, the geometrical clamp of movable clamping device one end are screwed to be fixed on and are oriented on rigid holder, can flexibly move up and down, automatic displacement is adopted
Collection meter be used for measure in concrete substrate on the amount of pulling out, the bar wing using epoxy resin be pasted onto on the fiber bar anti-float anchor rod body of rod away from
At the 5cm of concrete substrate top surface, the measuring point of test body of rod deflection is provided for automatic displacement acquisition meter.
3. the long-term anti-pulling capacity indoor test method of fiber bar anti-float anchor rod according to claim 2, it is characterised in that institute
Rigid base is stated to be made of the steel rectangle bottom plate of long 2.4m, width 1.2m, thickness 5cm；Earth anchor screw rod uses the steel body of casting, earth anchor
One end of screw rod is designed as the expansion header structure of long 25cm, width 10cm, high 10cm, the other end be threaded, the circle of diameter 6cm
Rod structure；Earth anchor nut uses wall thickness for the steel body of casting of 4cm, it is connect with earth anchor screw rod by screw thread couple mode；First column
It is all made of 140mm × 60mm × 8mm channel steels, the reserved holes diameter 50mm in capital of the first column and the second column with the second column
Hole is respectively used to installation first crossbeam fixing axle and third crossbeam fixing axle；First crossbeam fixing axle, third crossbeam fixing axle,
First crossbeam connecting rod fixing axle, second cross beam connecting rod fixing axle and third crossbeam connecting rod fixing axle are by high-strength pin and high-strength spiral shell
Box thread is of coupled connections composition, wherein high-strength bolt a diameter of 40mm of first crossbeam fixing axle, third crossbeam fixing axle, and first
The a diameter of 30mm of high-strength pin of crossbeam connecting rod fixing axle, second cross beam connecting rod fixing axle and third crossbeam connecting rod fixing axle；Rib
For plate using the steel material of thickness 0.8cm, shape is right-angled trapezium, a length of 20cm in top, following a length of 30cm, a height of 30cm；
First crossbeam, second cross beam, third crossbeam adopt wide 8cm, thickness 12cm steel materials, and length is respectively 1.6m, 1.3m, 1.0m
The bore dia that first crossbeam and third crossbeam are connected with the first column and the second column respectively is 50mm, second cross beam and the first cross
The bore dia that the connected hole of beam connecting rod, third crossbeam are connected with second cross beam connecting rod and third crossbeam connecting rod respectively is 40mm,
The left end of first crossbeam and the right end of second cross beam are reserved for the hole that the fiber bar anti-float anchor rod body of rod passes through respectively, and aperture is big
In the diameter of the fiber bar anti-float anchor rod body of rod；First crossbeam connecting rod, second cross beam connecting rod, third crossbeam connecting rod are all made of length
The steel material of 30cm, width 6cm, thickness 2cm.
4. the long-term anti-pulling capacity indoor test method of fiber bar anti-float anchor rod according to claim 2, it is characterised in that institute
It states the rigid holder of guiding to be welded using plain bar, that welds thereon is used to ensure fiber bar anti-float anchor rod body of rod verticality
A steel ring is welded on guide rod, steel ring diameter is more than fiber bar anti-float anchor rod shank diameter；High-strength nut is using wall thickness 3cm's
Hex nut, nut shim are circular ring shape steel disc, and internal diameter is more than the diameter of the fiber bar anti-float anchor rod body of rod, and outer diameter is more than high-strength
The outer diameter of nut；The bar wing using 5cm × 5cm × 0.5cm angle bar and internal diameter 2cm, wall thickness 0.3cm semicircle steel-pipe welding and
At the fiber bar anti-float anchor rod body of rod is glass fiber reinforced polymer full thread solid rod-like structure, and concrete substrate is using high
The cast-in-situ steel reinforced concrete rectangular parallelepiped structure of 1m, long 60cm, width 60cm, strength grade of concrete by rock uniaxial compressive strength
It determines, reinforcing bar uses HRB400；High-strength bolt use the threaded steel rod piece of lower end system, a diameter of 5cm, a length of 2.2m,
The hole depth of base threaded hole is 3cm, and steel cushion block is the rectangular bloom of 8cm × 8cm × 4cm, and center is formed with aperture 6cm's
Circular hole.
5. the long-term anti-pulling capacity indoor test method of fiber bar anti-float anchor rod according to claim 2, it is characterised in that institute
State movable clamping device by geometrical clamp, magnetic attraction pedestal, first direction adjuster, the first steel chain bar, second direction adjuster,
Second steel chain bar, guide clip holder composition, geometrical clamp is fixed in a manner of screwing clamping to be oriented on rigid holder, magnetic attraction bottom
Seat magnetic-adsorption is on the perpendicular of geometrical clamp, one end and the magnetic attraction tube chamber welds with base of first direction adjuster, the other end
It is fixedly connected with the first steel chain bar, one end of second direction adjuster is connected with the first steel chain bar, the other end and the second steel chain bar
It is connected, is fixed by fastening bolt between the first steel chain bar and the second steel chain bar, the length of the first steel chain bar and the second steel chain bar
With angle can flexible modulation, guide clip holder one end connect with one end of the second steel chain bar in a manner of screw thread couple, the other end
It is installed with automatic displacement acquisition meter by fastening bolt, guide clip holder is mounted on the second steel chain bar and automatic displacement acquires
Between meter, the upper surface of guide clip holder is formed with spirit level, horizontal for adjusting guide clip holder, it is ensured that automatic displacement acquisition meter
Verticality, and then keep displacement measurement accurate.
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| CN109577383A (en) * | 2018-11-29 | 2019-04-05 | 太原理工大学 | A kind of experimental rig and method of dynamic test suction anchor anti-pulling capacity |
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| CN112504587A (en) * | 2020-12-02 | 2021-03-16 | 西安建筑科技大学 | Device and method for testing bending creep strain of concrete continuous beam bridge under lever holding load |
| CN113295527A (en) * | 2021-05-24 | 2021-08-24 | 燕山大学 | Device for measuring stress relaxation of fiber reinforced composite bar and measuring method thereof |
| CN114563273A (en) * | 2022-04-28 | 2022-05-31 | 中国矿业大学(北京) | Anchor rod combination stress performance test system and evaluation method |
| CN117949304A (en) * | 2024-03-26 | 2024-04-30 | 河海大学 | Test device and method for simulating deep constant-resistance anchor rod drawing |
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| CN114563273A (en) * | 2022-04-28 | 2022-05-31 | 中国矿业大学(北京) | Anchor rod combination stress performance test system and evaluation method |
| CN114563273B (en) * | 2022-04-28 | 2022-08-09 | 中国矿业大学(北京) | Anchor rod combination stress performance test system and evaluation method |
| CN117949304A (en) * | 2024-03-26 | 2024-04-30 | 河海大学 | Test device and method for simulating deep constant-resistance anchor rod drawing |
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