CN109900563A - Oversize anchor structure face shearing test method - Google Patents
Oversize anchor structure face shearing test method Download PDFInfo
- Publication number
- CN109900563A CN109900563A CN201910079286.XA CN201910079286A CN109900563A CN 109900563 A CN109900563 A CN 109900563A CN 201910079286 A CN201910079286 A CN 201910079286A CN 109900563 A CN109900563 A CN 109900563A
- Authority
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- China
- Prior art keywords
- boss
- sample
- oversize
- shearing test
- anchor
- Prior art date
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- 238000010008 shearing Methods 0.000 title claims abstract description 33
- 239000004568 cements Substances 0.000 claims abstract description 10
- 238000006073 displacement reactions Methods 0.000 claims abstract description 4
- 239000003365 glass fibers Substances 0.000 claims abstract 2
- 238000004873 anchoring Methods 0.000 claims description 7
- 239000002131 composite materials Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000002956 ash Substances 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N magnesium Chemical compound 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tzdHJva2Utd2lkdGg6MHB4O3N0cm9rZS1saW5lY2FwOmJ1dHQ7c3Ryb2tlLWxpbmVqb2luOm1pdGVyO3N0cm9rZS1vcGFjaXR5OjE7JyAvPgo8L3N2Zz4K 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[Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000000034 methods Methods 0.000 abstract description 8
- 239000011435 rock Substances 0.000 description 11
- 239000012141 concentrates Substances 0.000 description 3
- 230000002079 cooperative Effects 0.000 description 3
- 238000005516 engineering processes Methods 0.000 description 2
- 239000000835 fibers Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003014 reinforcing Effects 0.000 description 1
- 238000007660 shear property test Methods 0.000 description 1
- 230000005476 size effect Effects 0.000 description 1
- 230000004083 survival Effects 0.000 description 1
Abstract
A kind of oversize anchor structure face shearing test method, the following steps are included: (1) makes multiple samples of base containing bolt cement according to indoor sample likelihood ratio principle, sample is the square containing boss, and side boss is respectively rectangle, and rectangular boss is square；(2) it is inserted into anchor pole in sample preparation, is simutaneously arranged high temperature high voltage resistant multifunctional optical fibre grating sensor；(3) sample group is combined into the more block samples of array of sizes；(4) the shearing test loading module to match with serial oversize sample is prepared；(5) stress condition of boss is judged using the stress, strain, displacement and the acoustic emission information that monitor；(6) step (1)-(5) are repeated and carry out the design of the oversize anchor structure face shearing test containing triangle boss.The present invention improves the matching, reasonability and science of test result, and can solve that oversize sample is difficult to install, reduces the security risk of shearing test process.
Description
Technical field
The invention belongs to indoor physical mechanics test technical fields more particularly to a kind of oversize anchor structure face to shear
Test method.
Background technique
Rock slope be it is closely related with environment for human survival and Geological Engineering activity, it is most basic be also it is particularly important
One of natural geological environment.High gradient slope is growing day by day simultaneously in the fields such as hydraulic and hydroelectric engineering and railway engineering, highway engineering
Slope rock mass stable problem is generated, and slope rock mass anchorage technology is occupied an leading position in reinforcing and the supporting processing of high slope,
It is one of most universal, most economical and most efficient method.Rock anchorage is branch important in geotechnical engineering field, and rock mass anchor
The research of solidity energy is the key that again rock anchorage technology success or failure.Rock anchorage refer to for prevention and harnessing landslide, subsidence,
The geological disasters such as tunnel collapsing, are reached using anchoring pieces such as anchor pole, prestressed anchor and anchor cables with improving the stress state of rock mass
To the measure for transferring and improving rock mass self-strength and self-stable ability.For large surface mine rock side slope, unstability mode
Substantially along structural plane shearing slip, therefore, the shear-type load that anchor structure face is subject to be can not ignore.Some scholars use at present
Large-size concrete or rock sample (structural plane size is between 30cm × 30cm and 30cm × 80cm range) and high strength cast iron
(8~40mm of diameter) has carried out single-unit reason or binodal reason direct shear test, belongs to reduced scale test, has ignored anchor structure face size effect
The influence answered.Some scholars propose full size shearing test, and structural plane length reaches several meters even tens meters, the anchor pole number needed
Amount reaches tens, and shearing force reaches kiloton, belongs to oversize shearing test, often occurs at the stress of sample end larger
Stress concentrate, cause specimen finish to be subject to crushing.Therefore, it is necessary to new shearing test design is carried out in terms of sample stress.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides a kind of oversize anchor structure face shearing test sides
Method is avoided that oversize sample end generates stress and concentrates and lead to local failure, and can guarantee anchor pole cooperative bearing, improves
The matching of test result, reasonability and science, while it is difficult to install to can solve oversize sample again, reduces shearing
The security risk of test process, cement base sample preparation process is simple, easy to use, at low cost, applied widely, is super large ruler
The design of very little test provides scientific basis.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of oversize anchor structure face shearing test method, comprising the following steps:
(1) multiple samples of base containing bolt cement are made according to indoor sample likelihood ratio principle, sample is the pros containing boss
Body, side boss are respectively rectangle, and the side length of sample is 4l, 0.4m≤l≤0.8m, and rectangular boss is square, and side length is
0.5l, spacing l；
(2) anchor pole is inserted into sample preparation, the anchoring of full grouted type is simutaneously arranged high temperature high voltage resistant multifunctional light
Spacing near fiber grating sensor, structural plane and boss is 0.1m, and the spacing of other positions is 0.2m；
(3) sample group being combined into the more block samples of array of sizes, the block quantity on shear direction is n, 2≤n≤
10, the block quantity in width direction is 2, and the block quantity in short transverse is 2；
(4) Hi-Stren steel is chosen according to national standard (GBT 1591-2018), preparation is tried with serial oversize
The shearing test loading module that sample matches；
(5) more block samples and shearing test module are assembled, and is sheared on large scale direct shear apparatus platform
Test arranges acoustic emission probe in Modular surface, judges boss using the stress, strain, displacement and the acoustic emission information that monitor
Stress condition；
(6) step (1)-(5) are repeated to carry out the oversize anchor structure face shearing test containing triangle boss and set
Meter, wherein triangle boss is equilateral triangle, side length 0.8l.
Further, in the step (1), a variety of composite materials such as magnesium ash can be added in cement base to improve its intensity.
Further, in the step (2), bolt diameter is 10-40mm, and anchoring diameter is 2 times of bolt diameter.
Further, in the step (3), if monitoring, boss deformation or rupture are serious, need to increase boss size,
Increase intensity simultaneously.
Compared with prior art, stress concentration is generated the invention can avoid oversize sample end and cause part broken
It is bad, and can guarantee anchor pole cooperative bearing, the matching, reasonability and science of test result are improved, while can solve again super
Large dimension specimen is difficult to install, reduces the security risk of shearing test process, and cement base sample preparation process is simple, user
Just, at low cost, applied widely, the design for oversize test provides scientific basis.
Detailed description of the invention
Fig. 1 is rectangular boss anchor structure interview sample shearing test design drawing of the invention；Wherein, (a) individual sample；
(b) muti-piece body composite sample；(c) loading module is sheared.
Fig. 2 is triangle boss anchor structure interview sample shearing test design drawing of the invention；Wherein, (a) individual sample；
(b) muti-piece body composite sample；(c) loading module is sheared.
Specific embodiment
The invention will be further described below.
As shown in Figure 1, a kind of oversize anchor structure face shearing test method, comprising the following steps:
(1) multiple samples of base containing bolt cement are made according to indoor sample likelihood ratio principle, sample is the pros containing boss
Body, shown in specific size such as Fig. 1 (a), side boss is respectively rectangle, and the side length of sample is 4l, 0.4m≤l≤0.8m, rectangle
Boss is square, side length 0.5l, spacing l；
(2) anchor pole is inserted into sample preparation, the anchoring of full grouted type is simutaneously arranged high temperature high voltage resistant multifunctional light
Spacing near fiber grating sensor, structural plane and boss is 0.1m, and the spacing of other positions is 0.2m；
(3) sample group is combined into the more block samples of array of sizes, as shown in Fig. 2 (a), the block quantity on shear direction is
N is a, 2≤n≤10, and the block quantity in width direction is 2, and the block quantity in short transverse is 2；
(4) Hi-Stren steel is chosen according to national standard (GBT 1591-2018), preparation is tried with serial oversize
The shearing test loading module that sample matches, as shown in Fig. 3 (a)；
(5) more block samples and shearing test module are assembled, and is sheared on large scale direct shear apparatus platform
Test is arranged acoustic emission probe in Modular surface, is judged using information such as stress, strain, displacement and the sound emissions monitored convex
The stress condition of platform；
(6) the oversize anchor structure face shearing test containing triangle boss can be carried out and set by repeating step (1)-(5)
Meter, wherein triangle boss is equilateral triangle, and side length 0.8l corresponds to Fig. 1 (b), 2 (b), 3 (b).
Further, in the step (1), a variety of composite materials such as magnesium ash can be added in cement base to improve its intensity.
In the step (2), bolt diameter is 10-40mm, and anchoring diameter is 2 times of bolt diameter.
In the step (3), if monitoring, boss deformation or rupture are serious, need to increase boss size, increase simultaneously
Intensity.
The scheme of the present embodiment is avoided that oversize sample end generates stress and concentrates and lead to local failure, and can protect
Anchor pole cooperative bearing is demonstrate,proved, improves the matching, reasonability and science of test result, while can solve oversize sample again
It is difficult to install, the security risk of shearing test process is reduced, cement base sample preparation process is simple, easy to use, at low cost,
Applied widely, the design for oversize test provides scientific basis.
Claims (4)
1. a kind of oversize anchor structure face shearing test method, which is characterized in that the described method comprises the following steps:
(1) multiple samples of base containing bolt cement are made according to indoor sample likelihood ratio principle, sample is the square containing boss, side
Side boss is respectively rectangle, and the side length of sample is 4l, 0.4m≤l≤0.8m, and rectangular boss is square, side length 0.5l,
Away from for l；
(2) anchor pole is inserted into sample preparation, the anchoring of full grouted type is simutaneously arranged high temperature high voltage resistant multifunctional optical fiber light
Spacing near gate sensor, structural plane and boss is 0.1m, and the spacing of other positions is 0.2m；
(3) sample group is combined into the more block samples of array of sizes, the block quantity on shear direction is n, 2≤n≤10, width
Block quantity on direction is 2, and the block quantity in short transverse is 2；
(4) Hi-Stren steel, preparation and serial oversize sample phase are chosen according to national standard (GBT 1591-2018)
Matched shearing test loading module；
(5) more block samples and shearing test module are assembled, and carry out shearing test on large scale direct shear apparatus platform,
Acoustic emission probe is arranged in Modular surface, and the stress of boss is judged using the stress, strain, displacement and the acoustic emission information that monitor
Situation；
(6) step (1)-(5) are repeated and carry out the design of the oversize anchor structure face shearing test containing triangle boss,
Intermediate cam shape boss is equilateral triangle, side length 0.8l.
2. oversize anchor structure as described in claim 1 face shearing test method, which is characterized in that the step (1)
In, a variety of composite materials such as magnesium ash can be added in cement base to improve its intensity.
3. oversize anchor structure as claimed in claim 1 or 2 face shearing test method, which is characterized in that the step
(2) in, bolt diameter is 10-40mm, and anchoring diameter is 2 times of bolt diameter.
4. oversize anchor structure as claimed in claim 1 or 2 face shearing test method, which is characterized in that the step
(3) in, if monitoring, boss deformation or rupture are serious, need to increase boss size, while increasing intensity.
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