CN106323208A - Strain gauge adhesion position determining method in stratified rock shock pressing rod test - Google Patents
Strain gauge adhesion position determining method in stratified rock shock pressing rod test Download PDFInfo
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- CN106323208A CN106323208A CN201610640134.9A CN201610640134A CN106323208A CN 106323208 A CN106323208 A CN 106323208A CN 201610640134 A CN201610640134 A CN 201610640134A CN 106323208 A CN106323208 A CN 106323208A
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- bar
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a strain gauge adhesion position determining method in a stratified rock shock pressing rod test. The method comprises the following steps: an ultrasonic wave detector is used for measuring wave velocity of an incident bar and different wave velocities of two kinds of rock stratums that form a stratified rock, thickness of the two kinds of rock stratums that form the stratified rock is measured, transmission time of ultrasonic waves transmitting in the two kinds of rock stratums that form the stratified rock is calculated, a shock pressing rod test system is used for conducting punching operation to obtain a wave form and a half cycle of a stress wave, a half wave length of the stress wave and transmission lengths of the stress wave in the incident bar in the two kinds of rock stratums that form the stratified rock in different time are calculated, and therefore adhesion positions of strain gauges can be determined. The strain gauge adhesion position determining method can be used for determining the adhesion positions of the strain gauges, different stress wave separate wave forms and composite wave forms can be obtained via strain gauges at different positions, and basic data can be provided for calculating characteristics such as dynamic mechanics and the like of different rock stratums of the stratified rock under a dynamic load. The strain gauge adhesion position determining method is advantaged by simple procedures and easy operation.
Description
Technical field
The present invention relates to the method that in the impact depression bar test of a kind of bedded rock, strain gauge adhesion position determines.
Background technology
In colliery or placer deposits rock, the rock stratum of layered distribution often.Different rock stratum is poor because density, intensity etc. exist
Different.Beded rock mass is being propagated with stress wave form therein by impact loading.Stress wave is propagated at beded rock mass
During produce reflection, transmission etc., simultaneously as differences such as different rock-layers density, cause different rock-layers subjected to stress difference,
Make each formation damage time and failure mode different.It is therefore desirable to calculate different rock-layers subjected to stress.And to calculate
Different rock-layers subjected to stress it is generally required to rock stratum both ends of the surface are incident, reflection, transmitted wave waveform, it is therefore necessary to select suitable position
Put stickup foil gauge, so that foil gauge can obtain preferable waveform.During single uniform dielectric impact depression bar is tested, because
Echo, transmitted wave are less, and the position of foil gauge only need to meet incidence wave and echo staggers.And for bedded rock,
Mainly having the rock that two media combines, incidence wave enters bedded rock from incident bar, incident bar and rock interface,
Two kinds of rock interfaces and rock and transmission bar interface reflect, transmission, then derive secondary thoroughly, reflect, cause waveform
More, if the same in the impact depression bar experiment of foil gauge position and single uniform dielectric, these waveforms it is possible to be combined with each other,
The source of waveform cannot be told, cause basic data not enough and stress can not be calculated.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention provides strain gauge adhesion position in a kind of bedded rock impact test true
Fixed method, the present invention can be determined by strain gauge adhesion position and realize the foil gauge real stress wave-wave of acquisition of diverse location
Shape, provides basic data for the mensuration at dynamic loading Layered rock different rock-layers dynamic characteristics.
The present invention solves the technical scheme of above-mentioned technical problem employing and comprises the following steps:
(1) ultrasonograph is utilized to measure the velocity of wave v of incident bar materialbar；
(2) ultrasonograph is utilized to measure the different velocity of wave v of the two kinds of rock stratum forming bedded rock sample1、v2；
(3) the thickness L of two kinds of rock stratum of composition bedded rock sample is measuredr1、Lr2；
(4) incident bar length L is measuredin, transmission bar length Lt；
(5) calculate ultrasound wave and propagate required time t respectively in two kinds of rock stratum of composition bedded rock sample1、t2:
t1=Lr1/v1、t2=Lr2/v2
(6) utilize SHPB percussive pressure lever system to make sky punching test, measure waveform and the half period T of incidence wave；
(7) then on incident bar, strain gauge adhesion position is:
First foil gauge distance right end on incident bar is: Lin1=vbarT+L0, L0=0.2m；
Second foil gauge, near sample one end, with the spacing of the first foil gauge is:
△Lin2=2vbart1；
3rd foil gauge, near sample one end, with the spacing of the second foil gauge is:
△Lin3=2vbart1；
(8) on transmission bar, strain gauge adhesion position is:
First transmission bar foil gauge distance transmission bar with sample contacts face is: Lt1=vbarT；
Second transmission bar foil gauge, away from sample one end, with the spacing of the first transmission bar foil gauge is:
△Lt2=2vbart2。
The method have technical effect that: the present invention is determined by strain gauge adhesion position thus realizes answering of diverse location
Become sheet and obtain different stress wave separation waveform and composite wave-shape, it is simple to preferably separate composite wave-shape, find in composite wave-shape
Hide waveform, provide basic data for calculating in characteristics such as dynamic loading Layered rock different rock-layers dynamic mechanical intensity.This
Bright have process simplicity, easy-operating advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation of assay device in the present invention.
In figure:
1, high pressure gas holder；2, drift；3, incident bar；4, the first foil gauge；
5, the second foil gauge；6, the 3rd foil gauge；7, bedded rock test specimen；8, the first transmission bar foil gauge；9, second is saturating
Rhizoma Belamcandae foil gauge；10, transmission bar；11, axial static pressure charger 12, data acquisition processing system.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the accompanying drawings.
As it is shown in figure 1, foil gauge includes first be pasted onto on incident bar in the rock mechanics experiment mentioned in the present invention
Foil gauge the 4, second foil gauge the 5, the 3rd foil gauge 6 and first transmission bar foil gauge the 8, second transmission bar being pasted onto on transmission bar
Foil gauge 9.
How to determine the position of these five foil gauges, concrete operation step is as follows:
(1) ultrasonograph is utilized to measure the velocity of wave v of incident bar materialbar；
(2) ultrasonograph is utilized to measure the different velocity of wave v of the two kinds of rock stratum forming bedded rock sample1、v2；
(3) the thickness L of two kinds of rock stratum of composition bedded rock sample is measuredr1、Lr2；
(4) incident bar length L is measuredin, transmission bar length Lt；
(5) calculate ultrasound wave and propagate required time t respectively in two kinds of rock stratum of composition bedded rock sample1、t2:
t1=Lr1/v1、t2=Lr2/v2
(6) utilize SHPB percussive pressure lever system to make sky punching test, measure the waveform of incidence wave, including half period T.
(7) then on incident bar, strain gauge adhesion position is:
First foil gauge position Lin1(distance incident bar and sample contacts face) Lin1=vbarT+L0
Second foil gauge position △ Lin2(near sample one end and the spacing of the first foil gauge)
△Lin2=2vbart1
3rd foil gauge position △ Lin3(near sample one end and the spacing of the second foil gauge)
△Lin3=2vbart1
(8) on transmission bar, strain gauge adhesion position is:
First transmission bar foil gauge position Lt1(distance transmission bar and sample contacts face) Lt1=vbarT
Second transmission bar foil gauge position △ Lt2(away from the spacing of the first foil gauge on sample one end and transmission bar)
△Lt2=2vbart2。
Claims (1)
1. the method that in the test of bedded rock impact depression bar, strain gauge adhesion position determines, bedded rock impact depression bar test
In device, incident bar is provided with three foil gauges, and transmission bar is provided with two panels foil gauge, it is characterised in that comprise the following steps:
(1) ultrasonograph is utilized to measure the velocity of wave v of incident bar materialbar；
(2) ultrasonograph is utilized to measure the different velocity of wave v of the two kinds of rock stratum forming bedded rock sample1、v2；
(3) the thickness L of two kinds of rock stratum of composition bedded rock sample is measuredr1、Lr2；
(4) incident bar length L is measuredin, transmission bar length Lt；
(5) calculate ultrasound wave and propagate required time t respectively in two kinds of rock stratum of composition bedded rock sample1、t2:
t1=Lr1/v1、t2=Lr2/v2
(6) utilize SHPB percussive pressure lever system to make sky punching test, measure waveform and the half period T of incidence wave；
(7) then on incident bar, strain gauge adhesion position is:
First foil gauge distance right end on incident bar is: Lin1=vbarT+L0, L0=0.2m；
Second foil gauge, near sample one end, with the spacing of the first foil gauge is:
△Lin2=2vbart1；
3rd foil gauge, near sample one end, with the spacing of the second foil gauge is:
△Lin3=2vbart1；
(8) on transmission bar, strain gauge adhesion position is:
First transmission bar foil gauge distance transmission bar with sample contacts face is: Lt1=vbarT；
Second transmission bar foil gauge, away from sample one end, with the spacing of the first transmission bar foil gauge is:
△Lt2=2vbart2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610640134.9A CN106323208B (en) | 2016-08-05 | 2016-08-05 | A kind of method that bedded rock impacts strain gauge adhesion position determination in compression bar test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610640134.9A CN106323208B (en) | 2016-08-05 | 2016-08-05 | A kind of method that bedded rock impacts strain gauge adhesion position determination in compression bar test |
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| CN106323208A true CN106323208A (en) | 2017-01-11 |
| CN106323208B CN106323208B (en) | 2018-12-04 |
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| CN201610640134.9A Active CN106323208B (en) | 2016-08-05 | 2016-08-05 | A kind of method that bedded rock impacts strain gauge adhesion position determination in compression bar test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406308A (en) * | 2018-12-17 | 2019-03-01 | 中国矿业大学(北京) | For studying the experiment loading system of underground Rock Masses Fractures problem |
Citations (5)
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| JPH02218936A (en) * | 1988-12-02 | 1990-08-31 | Shell Internatl Res Maatschappij Bv | Stratum sample freezing test and cell therefor |
| CN202145186U (en) * | 2011-07-07 | 2012-02-15 | 中国人民解放军空军工程大学 | Incident wave reshaping mechanism for active ambient pressure SHPB (split hopkinson pressure bar) test |
| CN203616217U (en) * | 2013-12-05 | 2014-05-28 | 张磊 | Experimental device for measuring spall strength of concrete |
| CN104198586A (en) * | 2014-08-08 | 2014-12-10 | 西北矿冶研究院 | Method for determining rock damage variable based on wave velocity under axial stress |
| CN104990777A (en) * | 2015-07-09 | 2015-10-21 | 中国矿业大学 | Impact damage rock sample preparation and assay method based on SHPB test |
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2016
- 2016-08-05 CN CN201610640134.9A patent/CN106323208B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02218936A (en) * | 1988-12-02 | 1990-08-31 | Shell Internatl Res Maatschappij Bv | Stratum sample freezing test and cell therefor |
| CN202145186U (en) * | 2011-07-07 | 2012-02-15 | 中国人民解放军空军工程大学 | Incident wave reshaping mechanism for active ambient pressure SHPB (split hopkinson pressure bar) test |
| CN203616217U (en) * | 2013-12-05 | 2014-05-28 | 张磊 | Experimental device for measuring spall strength of concrete |
| CN104198586A (en) * | 2014-08-08 | 2014-12-10 | 西北矿冶研究院 | Method for determining rock damage variable based on wave velocity under axial stress |
| CN104990777A (en) * | 2015-07-09 | 2015-10-21 | 中国矿业大学 | Impact damage rock sample preparation and assay method based on SHPB test |
Non-Patent Citations (3)
| Title |
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| 左宇军等: "《基于大直径霍普金森压杆数值试验的非均匀介质动态破坏过程分析》", 《岩土力学》 * |
| 张盛等: "动载确定方法对岩石动态断裂韧度测试的影响", 《岩土力学》 * |
| 李运良等: "《摆锤式间接杆-杆型SHTB装置的研制及FEM仿真分析》", 《工程力学》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406308A (en) * | 2018-12-17 | 2019-03-01 | 中国矿业大学(北京) | For studying the experiment loading system of underground Rock Masses Fractures problem |
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