CN109900563A - Oversize anchor structure face shearing test method - Google Patents

Oversize anchor structure face shearing test method Download PDF

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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
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China
Prior art keywords
boss
sample
oversize
shearing test
anchor
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Pending
Application number
CN201910079286.XA
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Chinese (zh)
Inventor
杜时贵
刘广建
林杭
雍睿
罗战友
夏才初
胡斌
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Ningbo University
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University of Shaoxing
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Application filed by University of Shaoxing filed Critical University of Shaoxing
Priority to CN201910079286.XA priority Critical patent/CN109900563A/en
Publication of CN109900563A publication Critical patent/CN109900563A/en
Pending legal-status Critical Current

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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

Oversize anchor structure face shearing test method
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.
CN201910079286.XA 2019-01-28 2019-01-28 Oversize anchor structure face shearing test method Pending CN109900563A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110887742A (en) * 2019-11-14 2020-03-17 宁波大学 Multi-oil-cylinder pushing method for large-size rock mass structural plane shear test based on bracket structure
CN111155449A (en) * 2020-01-10 2020-05-15 东南大学 Prefabricated UHPC (ultra high performance concrete) anchoring tooth block for external prestress reinforcement and construction method

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CN108265855A (en) * 2017-11-23 2018-07-10 同济大学 Reinforced concrete shear wall and its frame with anchor steel Shear Strengthening
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CN207919333U (en) * 2018-01-24 2018-09-28 华北水利水电大学 A kind of novel bridge shock mount
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CN109115106A (en) * 2018-08-23 2019-01-01 山东大学 Anchoring body producing device and anchoring interface strain piece method of attaching in model test
CN109115632A (en) * 2018-09-30 2019-01-01 河南理工大学 The comprehensive shearing experiment device of anchoring body and its experimental method
CN109269914A (en) * 2018-10-11 2019-01-25 山东科技大学 A kind of analysis method and pilot system of study of rocks joint plane failure by shear process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110887742A (en) * 2019-11-14 2020-03-17 宁波大学 Multi-oil-cylinder pushing method for large-size rock mass structural plane shear test based on bracket structure
CN111155449A (en) * 2020-01-10 2020-05-15 东南大学 Prefabricated UHPC (ultra high performance concrete) anchoring tooth block for external prestress reinforcement and construction method

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