CN102776900B - Anchor system working mechanism two-dimensional test method - Google Patents

Anchor system working mechanism two-dimensional test method Download PDF

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Publication number
CN102776900B
CN102776900B CN201210192423.9A CN201210192423A CN102776900B CN 102776900 B CN102776900 B CN 102776900B CN 201210192423 A CN201210192423 A CN 201210192423A CN 102776900 B CN102776900 B CN 102776900B
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China
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plate shape
anchor
anchor pole
test
plate
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CN201210192423.9A
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Chinese (zh)
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CN102776900A (en
Inventor
张传庆
周辉
杨凡杰
卢景景
徐荣超
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中国科学院武汉岩土力学研究所
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Abstract

The invention relates to an anchor system working mechanism two-dimensional test method and belongs to the technical field of geotechnical engineering. The anchor system working mechanism two-dimensional test method adopts a plate-shaped anchor rod (2), and a plate-shaped test block (1) and the plate-shaped anchor rod (2) are bonded through an anchoring agent (3) to be manufactured into a plate-shaped overlapped body test sample. Certain initial load is exerted on the plate-shaped overlapped body test sample, and then anchor rod pulling tests are performed. During the process, deformation and cracking of the anchoring agent (3) and the plate-shaped test block (1) and deformation and axial force distribution of the plate-shaped anchor rod (2) are recorded and observed, and accordingly direct observation and real-time tracking of the working process of an anchor system can be achieved. The anchor system working mechanism two-dimensional test method has important significance on anchor system working mechanism researches.

Description

Anchor system working mechanism two-dimensional test method
Technical field:
The present invention relates to a kind of anchor system working mechanism two-dimensional test method, belong to Geotechnical Engineering field, the method can be used in the experimental study of total length binding type anchor pole and the behavior of corresponding anchoring mechanics of system and working mechanism in Geotechnical Engineering.
Background technology:
Anchor pole is most widely used support reinforcement mode in Geotechnical Engineering, and total length binding type anchor pole is then apply maximum anchor pole types.The Rock And Soil be reinforced is called anchoring body, between anchor pole and anchoring body by Anchor Agent or adhesive cementation together.Although the application of this type anchor pole widely, the announcement of corresponding anchoring system works mechanism is a research puzzle in this field always.Anchor rod drawing test is the main experimental method in this Study on Problems, is still widely adopted so far.Whole sample is placed in an airtight sample chamber by traditional test method usually, and anchor pole is arranged in anchoring body boring by Anchor Agent, and only anchor rod experiment retained part exposes.Now, rockbolt installation is in boring, be in air-tight state, Anchor Agent in drawing process, the development process of anchoring body deformation fracture and the deformation process of anchor pole cannot be observed directly, and due to anchor pole and Anchor Agent interface, Anchor Agent and anchoring body interface in boring be arc surface, and very little, precise monitoring is very difficult, therefore, the understanding of these two interface mechanical behaviors and mathematics mechanics description are difficult to go deep into systematic study always.
Summary of the invention:
For above-mentioned existing problems, the object of the present invention is to provide a kind of anchor system working mechanism two-dimensional test method, described two-dimensional test method is carried out according to the following steps:
The two boards shape test block that a manufactured size is equal, by plate shape anchor pole thickness and the Anchor Agent formation adhesive layer thickness of setting, determine the spacing between the test block of two boards shape, corresponding sticky note foil gauge on two boards shape sample inside surface, the position of plate shape anchor pole between the test block of two boards shape is fixed by anchorage length L1, filling Anchor Agent in space between plate shape anchor pole and the test block of plate shape, the Anchor Agent formation adhesive layer thickness of plate shape anchor pole both sides is equal, be 4 ~ 8mm, be made into the superimposed body sample of plate shape bondd by the test block of plate shape, plate shape anchor pole and Anchor Agent;
Superimposed for plate shape body sample is positioned in the sample chamber of testing machine by b, and setting horizontal and vertical load rank, first applies vertical direction load to sample chamber load plate, and read load and displacement data, then apply horizontal direction load, and read load and displacement data;
The anchor pole overhanging end being in horizontal loading and the superimposed body sample of vertical load state lower plate shape is connected to drawing and adds carrier aircraft by c, applies drawing load, and to the shooting of drawing process whole process, record relevant data.
The thickness of described plate shape test block, height and length ratio are 1: 4: 10, and the test block of plate shape can be rock or artificial material.
Described plate shape anchor pole is rectangular parallelepiped, and the width of plate shape anchor pole is identical with plate shape test block thickness, and the width of plate shape anchor pole is 2.5: 1 with the ratio of thickness, and plate shape anchor pole is the one in metal material.
The type of described Anchor Agent is the one in cement or resin.
Owing to have employed above technical scheme, anchor system working mechanism of the present invention two-dimensional test method changes the test method of traditional anchor system working mechanism, test method adopts plate shape anchor pole and the test block of plate shape, by the change of plate shape anchor pole and plate shape test block shape and version, make traditional anchor pole and tack coat, circular arc surface of contact between tack coat and anchoring body becomes plane, change the triaxial test procedure of cylindrical for traditional employing anchor pole and square anchoring body into adopt plate shape anchor pole and plate shape anchoring body two-dimensional test method, the installation of the monitoring equipments such as foil gauge is more prone to, and by anchor pole in the direct real time record of gap overall process between the test block of two boards shape and shooting process of the test, the response of Anchor Agent and test block, overcoming conventional containment test method cannot the defect of direct viewing test process.
Accompanying drawing illustrates:
Fig. 1 is test arrangement schematic diagram of the present invention
Fig. 2 is the schematic diagram of plate shape test block shape in test method of the present invention
Fig. 3 is the schematic diagram of plate shape anchor pole shape in test method of the present invention
Fig. 4 is the relation curve that embodiment 1 monitors plate shape anchor rod drawing power and the displacement obtained
Fig. 5 is that embodiment 1 monitors the plate shape anchor axial force that obtains along the long distribution curve of bar
Fig. 6 is that embodiment 1 monitors the plate shape anchor pole and Anchor Agent interface shearing stress distribution curve that obtain
Fig. 7 is the relation curve that embodiment 2 monitors plate shape anchor rod drawing power and the displacement obtained
Fig. 8 is that embodiment 2 monitors the plate shape anchor axial force that obtains along the long distribution curve of bar
Fig. 9 is that embodiment 2 monitors the plate shape anchor pole and Anchor Agent interface shearing stress distribution curve that obtain
Figure 10 is the relation curve that embodiment 2 monitors plate shape anchor rod drawing power and the displacement obtained
Figure 11 is that embodiment 2 monitors the plate shape anchor axial force that obtains along the long distribution curve of bar
Figure 12 is that embodiment 2 monitors the plate shape anchor pole and Anchor Agent interface shearing stress distribution curve that obtain
Embodiment:
Embodiment 1
The present embodiment is described in further detail anchor system working mechanism of the present invention two-dimensional test method.
(1) selection of test material
Test material comprises the material for making plate shape test block 1, Anchor Agent 3 and plate shape anchor pole 2, the testing program that the selection of material depends primarily on test objective and formulates, in the present embodiment, the material of plate shape test block 1 is concrete, the material of Anchor Agent 3 is cement, and the material of plate shape anchor pole 2 is copper;
(2) the superimposed body sample production of plate shape
A makes the concrete slab shape test block 1 of thick 5cm, high 20cm, long 50cm in mould;
B processes wide 5cm, the copper plate shape anchor pole 2, anchorage length L1 of thick 20mm be 32cm, extension L2 is 50cm, and rock-bolt length is anchorage length L1 and extension L2 sum, is 82cm;
C places two plate shapes test block 1, plate shape anchor pole 2 in the superimposed body test sample-producing die of plate shape, ensure that plate shape anchor pole 2 is equal with the gap length between two plate shapes test block 1, fix two plate shapes test block 1, plate shape anchor pole 2 respectively, corresponding stickup foil gauge on two plate shapes test block 1 inside surface;
Filling Anchor Agent 3 in the gap of d between plate shape test block 1 and plate shape anchor pole 2 is 4mm at the thickness that plate shape anchor pole 2 is one-sided, and Anchor Agent 3 gross thickness is 8mm, and plate shape anchor pole thickness is 20mm, and therefore, the gap between two plate shapes test block 1 is 28mm;
E completes the superimposed body sample production of plate shape.
(3) initial load is applied
Superimposed for the plate shape made body sample is placed in the sample chamber of testing machine by a, vaseline is smeared in the position contacted with load plate 5,6 and fixed head 4,10 at sample, play lubrication, rubbing action after reducing sample load deflection and between load plate 5,6 and fixed head 4,10, avoids the stress distribution affecting sample;
After b sample installs, first the vertical load of 1kN is applied, make load plate 6, fixed head 4 and sample close contact, then the horizontal loading of 1kN is applied in left side, make load plate 5, fixed head 10 and sample close contact, ensure that in loading procedure, the stable and load application of sample is evenly distributed at specimen surface;
C carries out monitoring equipment and revises and initialization;
The speed that d presses 5kN/ minute applies the vertical load 6 of 20kN and the horizontal loading 7 of 20kN to setting load;
(4) anchor rod drawing test
Drawing load 8 is applied by the speed of 5kN/ minute, and the anchoring section L1 whole process shooting to plate shape anchor pole 2, Real-Time Monitoring also records data, is pulled off or stops testing after Anchor Agent 3 damage inactivation between plate shape anchor pole 2 and plate shape test block 1 at plate shape anchor pole 2.
(5) test data analyzer
Fig. 4 ~ 6 are the curve of the present embodiment test data analyzer gained, Fig. 4 is the relation curve of pulling capacity and displacement in plate shape anchor rod drawing loading procedure, visible, along with the increase gradually of pulling capacity, anchor pole end displacement also approximately linear increases, but after rising to certain numerical value, anchoring body generation drawing destroys, and pulling capacity declines rapidly; Fig. 5 gives the distribution curve of plate shape anchor rod anchored section of axial stress along bar length, and visible, under drawing load action, anchor pole greatest axis power occurs in the external end head of anchoring section, and inwardly anchor axial force reduces rapidly thus, can analyze the position that anchor pole destroys accordingly; Fig. 6 gives the distribution curve that on plate shape anchor pole and Anchor Agent interface, shear stress is grown along bar, visible, shear stress on interface is different from the anchor axial force regularity of distribution, minimum at anchoring section external end head, inwardly increase to peak value rapidly, reduce rapidly afterwards, can accordingly assay surface break grow position and spread scenarios.Binding tests curve and the analysis of sample destructive process can understand the working mechanism of anchor system in depth.
Embodiment 2
(1) selection of test material
Test material comprises the material for making plate shape test block 1, Anchor Agent 3 and plate shape anchor pole 2, the testing program that the selection of material depends primarily on test objective and formulates, in the present embodiment, the material of plate shape test block 1 is marble, the material of Anchor Agent 3 is cement, and the material of plate shape anchor pole 2 is steel;
(2) the superimposed body sample production of plate shape
The Dali rock beam shape test block 1 of thick 5cm, high 20cm, long 50cm is burnished and fabricated in a cutting;
B processes wide 5cm, the steel plate shape anchor pole 2, anchorage length L1 of thick 20mm be 32cm, extension L2 is 50cm, and rock-bolt length is anchorage length L1 and extension L2 sum, is 82cm;
C places two plate shapes test block 1, plate shape anchor pole 2 in the superimposed body test sample-producing die of plate shape, ensure that plate shape anchor pole 2 is equal with the gap length between two plate shapes test block 1, fix two plate shapes test block 1, plate shape anchor pole 2 respectively, corresponding stickup foil gauge on two plate shapes test block 1 inside surface;
Filling Anchor Agent 3 in the gap of d between plate shape test block 1 and plate shape anchor pole 2 is 8mm at the thickness that plate shape anchor pole 2 is one-sided, and Anchor Agent 3 gross thickness is 16mm, and plate shape anchor pole thickness is 20mm, and therefore, the gap between two plate shapes test block 1 is 36mm;
E completes the superimposed body sample production of plate shape.
(3) initial load is applied
Superimposed for the plate shape made body sample is placed in the sample chamber of testing machine by a, vaseline is smeared in the position contacted with load plate 5,6 and fixed head 4,10 at sample, play lubrication, rubbing action after reducing sample load deflection and between load plate 5,6 and fixed head 4,10, avoids the stress distribution affecting sample;
After b sample installs, first the vertical load of 1kN is applied, make load plate 6, fixed head 4 and sample close contact, then the horizontal loading of 1kN is applied in left side, make load plate 5, fixed head 10 and sample close contact, ensure that in loading procedure, the stable and load application of sample is evenly distributed at specimen surface;
C carries out monitoring equipment and revises and initialization;
The speed that d presses 5kN/ minute applies the vertical load 6 of 20kN and the horizontal loading 7 of 20kN to setting load;
(4) anchor rod drawing test
Drawing load 8 is applied by the speed of 5kN/ minute, and the anchoring section L1 whole process shooting to plate shape anchor pole 2, Real-Time Monitoring also records data, is pulled off or stops testing after Anchor Agent 3 damage inactivation between plate shape anchor pole 2 and plate shape test block 1 at plate shape anchor pole 2.
(5) test data analyzer
Fig. 7 ~ 9 are the curve of the present embodiment test data analyzer gained, Fig. 7 is the relation curve of pulling capacity and displacement in plate shape anchor rod drawing loading procedure, visible, along with the increase gradually of pulling capacity, anchor pole end displacement also approximately linear increases, but after rising to certain numerical value, anchoring body generation drawing destroys, and pulling capacity declines rapidly; Fig. 8 gives the distribution curve of plate shape anchor rod anchored section of axial stress along bar length, and visible, under drawing load action, anchor pole greatest axis power occurs in the external end head of anchoring section, and inwardly anchor axial force reduces rapidly thus, can analyze the position that anchor pole destroys accordingly; Fig. 9 gives the distribution curve that on plate shape anchor pole and Anchor Agent interface, shear stress is grown along bar, visible, shear stress on interface is different from the anchor axial force regularity of distribution, minimum at anchoring section external end head, inwardly increase to peak value rapidly, reduce rapidly afterwards, can accordingly assay surface break grow position and spread scenarios.Binding tests curve and the analysis of sample destructive process can understand the working mechanism of anchor system in depth.
Embodiment 3
(1) selection of test material
Test material comprises the material for making plate shape test block 1, Anchor Agent 3 and plate shape anchor pole 2, the testing program that the selection of material depends primarily on test objective and formulates, in the present embodiment, the material of plate shape test block 1 is gypsum, the material of Anchor Agent 3 is resin, and the material of plate shape anchor pole 2 is aluminium;
(2) the superimposed body sample production of plate shape
The plasterboard shape test block 1 of thick 5cm, high 20cm, long 50cm is burnished and fabricated in a cutting;
B processes wide 5cm, the aluminum plate shape anchor pole 2, anchorage length L1 of thick 20mm be 32cm, extension L2 is 50cm, and rock-bolt length is anchorage length L1 and extension L2 sum, is 82cm;
C places two plate shapes test block 1, plate shape anchor pole 2 in the superimposed body test sample-producing die of plate shape, ensure that plate shape anchor pole 2 is equal with the gap length between two plate shapes test block 1, fix two plate shapes test block 1, plate shape anchor pole 2 respectively, corresponding stickup foil gauge on two plate shapes test block 1 inside surface;
Filling Anchor Agent 3 in the gap of d between plate shape test block 1 and plate shape anchor pole 2 is 6mm at the thickness that plate shape anchor pole 2 is one-sided, and Anchor Agent 3 gross thickness is 12mm, and plate shape anchor pole thickness is 20mm, and therefore, the gap between two plate shapes test block 1 is 32mm;
E completes the superimposed body sample production of plate shape.
(3) initial load is applied
Superimposed for the plate shape made body sample is placed in the sample chamber of testing machine by a, vaseline is smeared in the position contacted with load plate 5,6 and fixed head 4,10 at sample, play lubrication, rubbing action after reducing sample load deflection and between load plate 5,6 and fixed head 4,10, avoids the stress distribution affecting sample;
After b sample installs, first the vertical load of 1kN is applied, make load plate 6, fixed head 4 and sample close contact, then the horizontal loading of 1kN is applied in left side, make load plate 5, fixed head 10 and sample close contact, ensure that in loading procedure, the stable and load application of sample is evenly distributed at specimen surface;
C carries out monitoring equipment and revises and initialization;
The speed that d presses 2kN/ minute applies the vertical load 6 of 10kN and the horizontal loading 7 of 10kN to setting load;
(4) anchor rod drawing test
Drawing load 8 is applied by the speed of 2kN/ minute, and the anchoring section L1 whole process shooting to plate shape anchor pole 2, Real-Time Monitoring also records data, is pulled off or stops testing after Anchor Agent 3 damage inactivation between plate shape anchor pole 2 and plate shape test block 1 at plate shape anchor pole 2.
(5) test data analyzer
Fig. 7 ~ 9 are the curve of the present embodiment test data analyzer gained, Fig. 7 is the relation curve of pulling capacity and displacement in plate shape anchor rod drawing loading procedure, visible, along with the increase gradually of pulling capacity, anchor pole end displacement also approximately linear increases, but after rising to certain numerical value, anchoring body generation drawing destroys, and pulling capacity declines rapidly; Fig. 8 gives the distribution curve of plate shape anchor rod anchored section of axial stress along bar length, and visible, under drawing load action, anchor pole greatest axis power occurs in the external end head of anchoring section, and inwardly anchor axial force reduces rapidly thus, can analyze the position that anchor pole destroys accordingly; Fig. 9 gives the distribution curve that on plate shape anchor pole and Anchor Agent interface, shear stress is grown along bar, visible, shear stress on interface is different from the anchor axial force regularity of distribution, minimum at anchoring section external end head, inwardly increase to peak value rapidly, reduce rapidly afterwards, can accordingly assay surface break grow position and spread scenarios.Binding tests curve and the analysis of sample destructive process can understand the working mechanism of anchor system in depth.

Claims (4)

1. anchor system working mechanism two-dimensional test method, is characterized in that: described anchor system working mechanism two-dimensional test method is carried out according to the following steps:
The two boards shape test block (1) that a manufactured size is equal, by plate shape anchor pole (2) thickness and Anchor Agent (3) the formation adhesive layer thickness of setting, determine the spacing between two boards shape test block (1), corresponding sticky note foil gauge on two boards shape sample (1) inside surface, the position of plate shape anchor pole (2) between two boards shape test block (1) is fixed by anchorage length L1, filling Anchor Agent (3) in space between plate shape anchor pole (2) and plate shape test block (1), Anchor Agent (3) the formation adhesive layer thickness of plate shape anchor pole (2) both sides is equal, be 4 ~ 8mm, be made into by plate shape test block (1), the superimposed body sample of plate shape of plate shape anchor pole (2) and Anchor Agent (3) bonding,
Superimposed for plate shape body sample is positioned in the sample chamber of testing machine by b, setting horizontal and vertical load rank, first vertical direction load (7) is applied to sample chamber load plate, and read load and displacement data, apply horizontal direction load (8) again, and read load and displacement data;
The anchor pole overhanging end being in horizontal loading and the superimposed body sample of vertical load state lower plate shape is connected to drawing and adds carrier aircraft by c, applies drawing load (9), and to the shooting of drawing process whole process, record relevant data.
2. anchor system working mechanism according to claim 1 two-dimensional test method, is characterized in that: the thickness of described plate shape test block (1), height and length ratio are 1: 4: 10, and plate shape test block (1) is rock or artificial material.
3. anchor system working mechanism according to claim 1 two-dimensional test method, it is characterized in that: described plate shape anchor pole (2) is rectangular parallelepiped, the width of plate shape anchor pole (2) is identical with plate shape test block (1) thickness, the width of plate shape anchor pole (2) is 2.5: 1 with the ratio of thickness, and plate shape anchor pole (2) is the one in metal material.
4. anchor system working mechanism according to claim 1 two-dimensional test method, is characterized in that: the type of described Anchor Agent (3) is the one in cement or resin.
CN201210192423.9A 2012-06-12 2012-06-12 Anchor system working mechanism two-dimensional test method CN102776900B (en)

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CN105780772B (en) * 2016-03-24 2017-08-25 三峡大学 A kind of method by studying characteristic progress anchor pole strengthening motoring optimization design of the dilatancy binding material in anchor pole grouting
CN105954098B (en) * 2016-04-22 2018-12-25 华北水利水电大学 Stretching-shearing two-dimensional test method and device in anchor pole room
CN106124401B (en) * 2016-07-26 2018-12-28 山东科技大学 Anchor pole bond strength testing method
CN108169005B (en) * 2018-01-05 2020-10-30 河北建筑工程学院 Dynamic drawing test device for anchor rod of soil body

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